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Figure 11-39 Certificate problem
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If you get one of these errors, you need to decide what to do Good certificates do go bad (this even happened on my own Web site once) and sometimes the URLs on the certificates are not exactly the same as the site using them When in doubt, stop On the other hand, if the risk is low (for example, you re not entering a credit card number or other sensitive information) and you know and trust the site, proceeding is safe in most cases A courtesy e-mail or phone call to the Web site administrator notifying him or her about the invalid certificate is usually greatly appreciated Invalid certificates aren t the only potential problems After this basic check, the browser checks to see if the certificate has been revoked Root authorities, like VeriSign, generate Certificate Revocation Lists (CRLs) that a Web browser can check against Certificates are revoked for a number of reasons, but most of the time the reasons are serious, such as a hacked certificate If you get a revoked certificate error, it s better to stay away from the site until they fix the problem
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One of the first SSH-enabled programs to appear after the introduction of SSH was Secure Copy Protocol (SCP) SCP was one of the first protocols used to transfer data securely between two hosts and thus might have replaced FTP SCP works well, but lacks features such as a directory listing SCP still exists, especially with the well-known UNIX SCP command-line utility, but has for the most part been replaced by the more powerful SFTP
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Secure FTP (SFTP), also called SSH FTP, was designed as a replacement for FTP after many of the inadequacies of SCP (such as the inability to see the files on the other computer) were discovered Although SFTP and FTP have similar names and perform the same job of transferring files, the way in which they do that job differs greatly The introduction of SSH made it easy to secure most TCP applications just by running them in an SSH tunnel But FTP was a different case FTP uses two ports, 20 and 21, creating a two-session communication This makes FTP a challenge to run in its original form over SSH, because SSH can only handle one session per tunnel To fix this, a group of programmers from the OpenBSD organization developed a series of secure programs known collectively as OpenSSH SFTP was one of those programs SFTP looks like FTP, with servers and clients, but relies on an SSH tunnel If you are on Windows and would like to connect with an SFTP server, WinSCP and FileZilla are two great client options
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Simple Network Management Protocol (SNMP) is a very popular method for querying the state of SNMP-capable devices SNMP can tell you a number of settings like CPU usage, network utilization, and detailed firewall hits SNMP uses agents (special client programs) to collect network information from a Management Information Base (MIB), SNMP s version of a server To use SNMP you need SNMP-capable devices and some tool to query them One tool is Cacti (wwwcactinet), shown in Figure 11-40 Cacti, like most good SNMP tools, enables you to query an SNMP-capable device for hundreds of different types of information
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11: Securing TCP/IP
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Figure 11-40 Cacti at work
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SNMP is a useful tool for network administrators, but the first version, SNMPv1, sent all data, including the passwords, unencrypted over the network SNMPv2 had good encryption, but was rather challenging to use SNMPv3 is the standard version used today and combines solid, fairly easy-to-use authentication and encryption NOTE SNMP runs on UDP port 161
The Network Time Protocol (NTP) does one thing: it gives you the current time NTP is an old protocol and isn t in and of itself much of a security risk unless you re using some timestamping protocol like Kerberos Windows is by far the most common Kerberos user, so just make sure all of your computers have access to an NTP server so that users don t run into problems when logging in NTP uses UDP port 123
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