Controlling Access via Configuration Files in .NET framework

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Controlling Access via Configuration Files
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Once your Windows Firewall application is configured to allow your customers access to the server, your PostgreSQL server must be configured to accept remote connections This is done using the postgresqlconf and pg_hbaconf configuration files, described in 3 The postgresqlconf file contains a single entry that controls which network interfaces PostgreSQL listens for connections on By default, the listen_addresses setting is set to the value localhost This value prevents remote clients from connecting to the PostgreSQL server
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To enable remote network clients to connect to the PostgreSQL server, you must either enter the IP addresses of the network interfaces to activate or enter the asterisk (*) wildcard character to enable all network ports, as follows:
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listen_addresses = '*'
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After setting the listen addresses in the postgresqlconf file, the next step is to use the pg_hbaconf file to define which clients can connect to which database, using which Login Role As described in 3, the pg_hbaconf configuration file defines access rules for allowing remote customers access to the PostgreSQL server Each entry in the configuration file defines an individual access rule If a client meets any one of the rules, it is allowed access to the specified resources on the server If a client fails all of the rules, it is prevented from accessing the databases on the server As shown in 3, the format of each rule entry is
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connection-type database user network-address login-method options
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The connection-type field defines the method used by the remote client to connect to the server For network hosts, there are three possible values: host Allows a remote client to connect using either a plain-text TCP connection or an SSL-encrypted TCP connection hostssl Requires that a remote client connect to the server using an SSLencrypted TCP connection hostnossl Requires that a remote client connect to the server using a plaintext TCP connection After the connection type, you must define the database the network client is allowed to connect to, along with the user Login Role allowed to connect You can either specify individual database and Login Role names or use the all keyword to allow the network address defined in the rule to connect to any database using any Login Role on the server The network-address field specifies which network clients the rule applies to It can specify a single network client IP address, or an IP address and subnet mask combination to define an entire subnet of clients When a client connects to the PostgreSQL server, its network address is compared with the network-address field in the pg_hba conf file Only rules that match that network address are applied to the client Finally, the login-method field specifies the method the remote client must use to authenticate the Login Role name sent by the client to the PostgreSQL server The most common methods are password and md5 The password method passes a plain-text password, which, while not recommended in plain-text TCP sessions, is just fine if used
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in an SSL-encrypted TCP session The md5 method allows for encrypting the password before sending it to the server, which is recommended if using a plain-text TCP session Here are a few sample entries in the pg_hbaconf file:
hostssl host host host all test test2 test all barney barney all 10010/28 1921681205 1921681205 10020/28 password md5 md5 md5
This first example allows any client on the 10010 subnetwork to connect to any database using any Login Role The client must connect using SSL encryption In the second example, the 1921681205 network client can only log into the test database using the Login Role barney (and using an encrypted password) The third example, however, lets the barney Login Role from the same network client also log into the test2 database as well The final example allows any client from the 10020 subnet to log in using any Login Role to the test database This allows multiple customers from that network to connect to the test database After editing the configuration files, the PostgreSQL server must be either stopped and started or reloaded for the changes to become active You can do this either from the pgAdmin III interface or from the pg_ctl command-line program
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