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I P s e c a n d Vi r t u a l P r i v a t e N e t w o r k s
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spdadd 19216800/24 19216810/24 any -P out ipsec esp/tunnel/10001100235/require; spdadd 19216810/16 19216800/24 any -P in ipsec esp/tunnel/10023510001/require;
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If you use racoon to configure gateway connections, you have to set only the security policies on each gateway, letting the racoon server generate the needed security associations
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PART V
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CHAPTER
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o protect remote connections from hosts outside your network, transmissions can be encrypted (see Table 19-1) For Linux systems, you can use the Secure Shell (SSH) suite of programs to encrypt and authenticate transmissions, preventing them from being read or modified by anyone else, as well confirming the identity of the sender The SSH programs are meant to replace remote tools such as rsh and rcp, which perform no encryption and include security risks such as transmitting passwords in clear text User authentication can be controlled for certain services by Kerberos servers Kerberos authentication provides another level of security whereby individual services can be protected, allowing use of a service only to users who are cleared for access
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The Secure Shell: OpenSSH
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Although a firewall can protect a network from attempts to break into it from the outside, the problem of securing legitimate communications to the network from outside sources still exists A particular problem is one of users who want to connect to your network remotely Such connections could be monitored, and information such as passwords and user IDs used when the user logs in to your network could be copied and used later to break in One solution is to use SSH for remote logins and other kinds of remote connections such as FTP transfers SSH encrypts any communications between the remote user and a system on your network Two different implementations of SSH currently use what are, in effect, two different and incompatible protocols The first version of SSH, known as SSH1, uses the original SSH protocol Version 20, known as SSH2, uses a completely rewritten version of the SSH protocol Encryption is performed in different ways, encrypting different parts of a packet SSH1 uses server and host keys to authenticate systems, whereas SSH2 uses only host keys Furthermore, certain functions, such as sftp, are supported only by SSH2
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NOTE A commercial version of SSH is available from SSH Communications Security, whose
website is sshcom SSH Communications Security provides an entirely commercial version called SSH Tectia, designed for enterprise and government use The older noncommercial SSH package is still freely available, which you can download and use
Part V:
Security
Website opensshorg sshcom webmitedu/kerberos
Description OpenSSH open source version of SSH SSH Communications Security, commercial SSH version Kerberos authentication
TABLE 19-1 SSH and Kerberos Resources
The SSH protocol has become an official Internet Engineering Task Force (IETF) standard A free and open source version is developed and maintained by the OpenSSH project, currently supported by the OpenBSD project OpenSSH is the version supplied with most Linux distributions, including Fedora, Red Hat, Novell, and Debian You can find out more about OpenSSH at opensshorg, where you can download the most recent version, though your distribution will provide current RPM versions
SSH Encryption and Authentication
SSH secures connections by both authenticating users and encrypting their transmissions The authentication process is handled with public-key encryption Once authenticated, transmissions are encrypted by a cipher agreed upon by the SSH server and client for use in a particular session SSH supports multiple ciphers Authentication is applied to both hosts and users SSH first authenticates a particular host, verifying that it is a valid SSH host that can be securely communicated with Then the user is authenticated, verifying that the user is who they say they are SSH uses strong encryption methods, and their export from the United States may be restricted Currently, SSH can deal with the following kinds of attacks: IP spoofing, where a remote host sends out packets that pretend to come from another, trusted host IP source routing, where a host can pretend an IP packet comes from another, trusted host DNS spoofing, where an attacker forges name server records Interception of clear-text passwords and other data by intermediate hosts Manipulation of data by people in control of intermediate hosts Attacks based on listening to X authentication data and spoofed connections to the X11 server
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