Login-method Field in .NET framework

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Login-method Field
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The login-method field defines the method the client must use to authenticate with the PostgreSQL system PostgreSQL supports quite a few different login methods Unfortunately, though, some of the supported methods are only available on Unix platforms The values available on Windows installations are as follows: trust reject
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The PostgreSQL Files and Programs
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ident password md5 crypt krb5 The trust authentication method provides for no password requirement It assumes that any client that connects to the PostgreSQL server should be allowed to access database items It relies on the PostgreSQL database restrictions to handle the actual restrictions This feature works fine in a single-user environment, but is not recommended in a multiuser environment The reject authentication method specifically prohibits clients matching the record from accessing the PostgreSQL system This is often used for temporarily restricting access to the system for a specific user or host The ident authentication method uses the client userid from the client s host system The system assumes that all client authentication has been performed by the remote host system to verify the userid supplied is valid The remote client userid is then mapped to a valid PostgreSQL user account using a separate configuration file This will be discussed in more detail later in The pg_identconf File section The next three authentication methods provide for a client to send a separate password through the TCP/IP connection to the PostgreSQL server The password can be in one of three forms, as described for the following authentication methods: password Sends password in plain text through the connection md5 Sends an MD-5-encrypted version of the password through the connection crypt Sends a crypt-encrypted version of the password through the connection Obviously, if you are working on an open network such as the Internet, it is best to use one of the encrypted authentication methods (unless you are connecting using an SSL connection) If you are just experimenting on your own home network or internal corporate network, the password authentication method works just fine The krb5 authentication method uses secure Kerberos technology to send an encrypted password key between the client and PostgreSQL server This is the most secure method of authentication
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Options Field
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The options field provides an area for options to be supplied when using the ident authentication method The keyword sameuser is used to bypass the pg_identconf configuration file and pass the received client userid to PostgreSQL as the logged on user account This assumes that PostgreSQL user account names match the userids assigned to users by the remote host
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PostgreSQL 8 for Windows
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If this is not the case, a map name can be specified as the option to point to a specific entry class in the pg_identconf configuration file PostgreSQL matches the remote client userid within the map name class to a PostgreSQL user account defined in the configuration file The upcoming section The pg_identconf File explains this process in more detail
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Example pg_hbaconf Records
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Now that you have seen what all of the record fields look like, it is time to take a look at a few examples If you look at the default pg_hbaconf configuration file created by the PostgreSQL install, you should see the following record:
host all all 127001/32 md5
This entry applies to all host connections originating from the local loopback address (127001) of the PostgreSQL server for all users connecting to all databases Basically, this applies to every time you connect to the PostgreSQL server from the local system This record specifies that these types of connections must use the md5 authentication method to authenticate PostgreSQL user accounts Thus, you must supply an appropriate password when you try to log into the PostgreSQL system from the local server Here is another sample record that can be created:
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