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In addition to using a password for authentication, SSH also can use public keys to identify clients This opens up some interesting possibilities such as no-interaction logins You can also turn off password login altogether, hardening your server even further To use public/private keys for authentication, you must first generate a pair of RSA or Digital Signature Algorithm (DSA) keys with a tool such as PuTTYgen (Figure 11-33) The public key is then copied to the server and the private key is kept safe on the client When you connect to the server, your client generates a signature using its private key and sends it to the server The server then checks the signature with its copy of the public key, and if everything checks out, you will be authenticated with the server If SSH stopped here as a secure replacement for Telnet, that would be fantastic, but SSH has another trick up its sleeve: the capability to act as a tunnel for any TCP/IP application Let s see what tunnels are and how they work for us

Cat5K> (enable) configure 19216811 5500cfg Configure using 5500cfg from 19216811 (y/n) [n] y / Done Finished Network Download (302 bytes) >> set ip alias CCNA1900A 192168111 IP alias added >> set prompt 5500> >> set password Enter old password: cisco Enter new password: ccie Retype new password: ccie Password changed Cat5K> (enable)

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StrType(char *str); StrType(const StrType &o); // copy constructor ~StrType() { delete [] p; } friend ostream &operator<<(ostream &stream, StrType &o); friend istream &operator>>(istream &stream, StrType &o); StrType operator=(StrType &o); // assign a StrType object StrType operator=(char *s); // assign a quoted string StrType operator+(StrType &o); // concatenate a StrType object StrType operator+(char *s); // concatenate a quoted string friend StrType operator+(char *s, StrType &o); /* concatenate a quoted string with a StrType object */ StrType operator-(StrType &o); // subtract a substring StrType operator-(char *s); // subtract a quoted substring // relational operations between StrType objects int operator==(StrType &o) { return !strcmp(p, op); } int operator!=(StrType &o) { return strcmp(p, op); } int operator<(StrType &o) { return strcmp(p, op) < 0; } int operator>(StrType &o) { return strcmp(p, op) > 0; } int operator<=(StrType &o) { return strcmp(p, op) <= 0; } int operator>=(StrType &o) { return strcmp(p, op) >= 0; } // operations between StrType objects and quoted strings int operator==(char *s) { return !strcmp(p, s); } int operator!=(char *s) { return strcmp(p, s); } int operator<(char *s) { return strcmp(p, s) < 0; } int operator>(char *s) { return strcmp(p, s) > 0; } int operator<=(char *s) { return strcmp(p, s) <= 0; } int operator>=(char *s) { return strcmp(p, s) >= 0; } int strsize() { return strlen(p); } // return size of string void makestr(char *s) { strcpy(s, p); } // make quoted string operator char *() { return p; } // conversion to char * }; APPLYING C++

The second variant of this command, configure network, prompts you for the IP address of the remote server and the filename of the configuration file Other than this difference, it operates identically to the configure [server name or ip address] variant

Simply, a tunnel is an encrypted link between two programs on two separate computers Let s take a look at an SSH link between a server and a client Once established, anything you enter into the client application is encrypted, sent to the server, decrypted, and then acted upon (Figure 11-34) The nature of SSH is such that it took very little to extend the idea of SSH to accept input from any source, even another program (Figure 11-35) As long as the program could redirect to the SSH client and then the SSH server redirect to the server application, anything can go through an SSH connection encrypted This is an SSH tunnel

The private part of StrType contains only two items: p and size When a string object is created, memory to hold the string is dynamically allocated by using new, and a pointer to that memory is put in p The string pointed to by p will be a normal, nullterminated character array Although it is not technically necessary, the size of the string is held in size Because the string pointed to by p is a null-terminated string, it would be possible to compute the size of the string each time it is needed However, as you will see, this value is used so often by the StrType member functions that the repeated calls to strlen( ) cannot be justified The next several sections detail how the StrType class works

The copy command on a CatOS-based switch is used to copy configuration and flash images to and from the device

SSH tunnels are wildly popular and fairly easy to set up Equally, all of the popular SSH clients and servers are designed to go into tunnel mode, usually with no more than the simple click of a check box (Figure 11-36)

The basic syntax for this command is the same as for a standard IOS based device: copy [source] [destination] However, on a CatOS-based switch, the source and destination targets can be slightly different The valid targets on CatOS switches include [file path], tftp, rcp, flash, config, cfg1, and cfg2

A StrType object may be declared in three different ways: without any initialization, with a quoted string as an initializer, or with a StrType object as an initializer The constructors that support these three operations are shown here:

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