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.. rndc.conf - rndc configuration file rndc.conf rndc.conf is the configuration file for \%rndc, the BIND 9 name server control utility. This file has a similar structure and syntax to \%named.conf. Statements are enclosed in braces and terminated with a semi-colon. Clauses in the statements are also semi-colon terminated. The usual comment styles are supported: C style: /* */ C++ style: // to end of line Unix style: # to end of line rndc.conf is much simpler than \%named.conf. The file uses three statements: an options statement, a server statement, and a key statement. The options statement contains five clauses. The default-server clause is followed by the name or address of a name server. This host is used when no name server is given as an argument to \%rndc. The default-key clause is followed by the name of a key, which is identified by a key statement. If no keyid is provided on the rndc command line, and no key clause is found in a matching server statement, this default key is used to authenticate the server\(aqs commands and responses. The default-port clause is followed by the port to connect to on the remote name server. If no port option is provided on the rndc command line, and no port clause is found in a matching server statement, this default port is used to connect. The default-source-address and default-source-address-v6 clauses can be used to set the IPv4 and IPv6 source addresses respectively. After the server keyword, the server statement includes a string which is the hostname or address for a name server. The statement has three possible clauses: key, port, and addresses. The key name must match the name of a key statement in the file. The port number specifies the port to connect to. If an addresses clause is supplied, these addresses are used instead of the server name. Each address can take an optional port. If an source-address or source-address-v6 is supplied, it is used to specify the IPv4 and IPv6 source address, respectively. The key statement begins with an identifying string, the name of the key. The statement has two clauses. algorithm identifies the authentication algorithm for \%rndc to use; currently only HMAC-MD5 (for compatibility), HMAC-SHA1, HMAC-SHA224, HMAC-SHA256 (default), HMAC-SHA384, and HMAC-SHA512 are supported. This is followed by a secret clause which contains the base-64 encoding of the algorithm\(aqs authentication key. The base-64 string is enclosed in double quotes. There are two common ways to generate the base-64 string for the secret. The BIND 9 program \%rndc-confgen can be used to generate a random key, or the mmencode program, also known as mimencode, can be used to generate a base-64 string from known input. mmencode does not ship with BIND 9 but is available on many systems. See the Example section for sample command lines for each. NDENT 0.0 NDENT 3.5 .EX options { default-server localhost; default-key samplekey; }; NINDENT NINDENT NDENT 0.0 NDENT 3.5 .EX server localhost { key samplekey; }; NINDENT NINDENT NDENT 0.0 NDENT 3.5 .EX server testserver { key testkey; addresses { localhost port 5353; }; }; NINDENT NINDENT NDENT 0.0 NDENT 3.5 .EX key samplekey { algorithm hmac-sha256; secret \(dq6FMfj43Osz4lyb24OIe2iGEz9lf1llJO+lz\(dq; }; NINDENT NINDENT NDENT 0.0 NDENT 3.5 .EX key testkey { algorithm hmac-sha256; secret \(dqR3HI8P6BKw9ZwXwN3VZKuQ==\(dq; }; NINDENT NINDENT In the above example, \%rndc by default uses the server at localhost (127.0.0.1) and the key called \(dqsamplekey\(dq. Commands to the localhost server use the \(dqsamplekey\(dq key, which must also be defined in the server\(aqs configuration file with the same name and secret. The key statement indicates that \(dqsamplekey\(dq uses the HMAC-SHA256 algorithm and its secret clause contains the base-64 encoding of the HMAC-SHA256 secret enclosed in double quotes. If \%rndc -s testserver is used, then \%rndc connects to the server on localhost port 5353 using the key \(dqtestkey\(dq. To generate a random secret with \%rndc-confgen: \%rndc-confgen A complete rndc.conf file, including the randomly generated key, is written to the standard output. Commented-out key and controls statements for \%named.conf are also printed. To generate a base-64 secret with mmencode: echo \(dqknown plaintext for a secret\(dq | mmencode The name server must be configured to accept rndc connections and to recognize the key specified in the rndc.conf file, using the controls statement in \%named.conf. See the sections on the controls statement in the BIND 9 Administrator Reference Manual for details. \%rndc(8), \%rndc-confgen(8), mmencode(1), BIND 9 Administrator Reference Manual. Internet Systems Consortium 2024, Internet Systems Consortium Generated by docutils manpage writer.
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