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Testing Remote Connectivity
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After configuring your network environment in PostgreSQL, it is usually a good idea to test it out You can use the psql program to test connections to the PostgreSQL server from a remote client The -h option is used to specify the hostname (or IP address) of the remote PostgreSQL server:
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C:\Program Files\PostgreSQL\82\bin>psql -h 100133 test barney Password for user barney: Welcome to psql 820, the PostgreSQL interactive terminal Type: \copyright for distribution terms \h for help with SQL commands \ for help with psql commands \g or terminate with semicolon to execute query \q to quit
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Once the connection to the remote host is established, you can perform all of the normal psql meta-commands and SQL commands just as if you were connected to a local PostgreSQL server
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ENCRYPTING NETWORK SESSIONS
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By default, the PostgreSQL server is configured to accept remote client connections using a standard TCP text connection There is a downside to connecting to a remote PostgreSQL server using this type of connection Figure 10-4 demonstrates the problem This network trace shows a single TCP packet going from the client running the psql application to the PostgreSQL server Notice that the SQL command sent by the psql application is shown within the packet in plain text, visible in the lower window of the Wireshark network sniffer display shown in Figure 10-4 This could be a security problem, especially if your customers connect to your server across public networks Anyone with access to the network can intercept the data packets and see the query Even worse, not only are the SQL commands sent in clear text, but the result set generated by the SQL command is also sent from the PostgreSQL server to the psql client in clear-text format This enables a network snooper to see your table data as well To solve this problem, PostgreSQL supports Secure Sockets Layer (SSL)-encrypted TCP sessions SSL-encrypted TCP sessions use an encryption key to encrypt data before it is
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Figure 10-4 Network trace of a PostgreSQL TCP connection
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Security
sent out on the network The PostgreSQL server and the remote client pass an encryption key that is used to encrypt the data Theoretically, only those two devices should be able to decrypt the data that is encrypted and sent out on the network Figure 10-5 shows a network trace of a SQL command contained in an SSL-encrypted TCP session The text SQL command has been encrypted and is unintelligible to the naked eye while it is on the network The PostgreSQL server is able to receive the encrypted packet, decrypt the text, and process the SQL command just as normal The process is then reversed when the PostgreSQL server sends the result set back to the client While encrypting data is not 100 percent foolproof (the SSL encryption can be broken using a bruteforce technique, which could take a few days), it does provide a basic level of security for clients connecting to the PostgreSQL server across public networks By the time the encryption key is cracked, the database connection is most likely no longer active, and the key is useless The following sections describe the process of how to set up your Windows PostgreSQL server to accept SSL-encrypted TCP sessions
Figure 10-5 Network trace of an SSL-encrypted PostgreSQL TCP session
PostgreSQL 8 for Windows
Enabling SSL in PostgreSQL
The first step is to ensure that your PostgreSQL installation is capable of supporting SSL connections Fortunately, the PostgreSQL server installation package created for Windows is already compiled for SSL encryption support, so you do not need to recompile anything All you need to do is enable SSL support in the configuration file and provide the appropriate encryption key and certificate files for the server to use Enabling SSL support in the configuration file is simple Just modify the ssl parameter value in the postgresqlconf configuration file In the default postgresql conf configuration file, the ssl parameter is present but commented out To enable SSL connections, just change the line to enable SSL support:
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