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search for and remove any files named .rhosts in the user directories. A cron entry for a root like this
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0 2 * * * find /staff name .rhosts print exec rm{} \;
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should execute this simple find and remove command every morning at 2 A.M. for all user accounts whose home directories lie within the /staff partition.
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OpenSSH (or just plain SSH) is a secure client and server solution that facilitates the symmetric and asymmetric encryption of identification and authentication sequences for remote access. It is designed to replace the Telnet and rlogin applications on the client side, with clients available for Solaris, Windows, and many other operating systems. On the server side, it improves upon the nonsecure services supported by inetd, such as the r-commands. Figure 9-4 shows a typical SSH client session from a Windows client. SSH uses a generic Transport layer encryption mechanism over TCP/IP, which uses either the popular Blowfish algorithm or the U.S. government endorsed triple-DES algorithm for the encryption engine. This is used to transmit encrypted packets whose contents can still be sniffed like all traffic on the network by using public key cryptography, implementing the Diffie-Hellman algorithm for key exchange. Thus, the contents of encrypted packets appear to be random without the appropriate key to decrypt them.
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The use of encryption technology makes it extremely unlikely that the contents of the interactive session will ever be known to anyone except the client and the server. In addition to the encryption of session data, identification and authentication sequences are also encrypted using RSA encryption technology. This means that username and password combinations also cannot be sniffed by a third party. SSH also provides automatic forwarding for graphics applications, based around the X11 windowing system, which is a substantial improvement over the text-only Telnet client. The sequence of events for establishing an SSH client connection to a server is demonstrated in Figure 9-5, for the standard username/password authentication, and proceeds as follows: 1. The client connects to a server port (usually port 22, but this can be adapted to suit local conditions) and requests a connection. 2. The server replies with its standard public RSA host key (1024 bits), as well as another RSA server key (768 bits) that changes hourly. Since the server key changes hourly, even if the key for the traffic of one session was cracked, historic data would still remain encrypted, limiting the utility of any such attack. 3. The server can be configured to reject connections from hosts that it doesn t know about, but by default, it will accept connections from any client. 4. If the connection is accepted, the client generates a session key composed of a 256-bit random number and chooses an encryption algorithm that the server supports (triple-DES or Blowfish). 5. The client encrypts the session key using RSA, using both the host and server key, and returns the encrypted key to the server. 6. The server decrypts the session key and encryption is enabled between the client and server. 7. If the default authentication mechanism is selected, the client passes the username and password for the server across the secure channel. SSH supports public key based authentication: it is easy to disable the username/ password authentication sequence by permitting logins to clients that have an appropriate private RSA key, as long as the server has a list of accepted public keys. However, if a client computer is stolen, and the private key is retrieved by a rogue user, access to the server can be obtained without a valid username and password combination. On the client side, a knwnhsts.txt or known_hosts file is created and server keys are recorded there. Entries look like this:
server 1024 35 0744831885522065092886345918214809000874876031312 6632026365561406995692291726767198155252016701986067549820423736 3937365939987293508473066069722639711474295242507691974151195842 9560631766264598422692206187855359804332680624600001698251375726 2927556592987704211810142126175715452796748871506131894685401576 4183
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