Ubuntu Manpage: Net::DNS::RR::SIG - DNS SIG resource record

NAME

       Net::DNS::RR::SIG - DNS SIG resource record

SYNOPSIS

           use Net::DNS;
           $rr = new Net::DNS::RR('name SIG typecovered algorithm labels
                                       orgttl sigexpiration siginception
                                       keytag signame signature');

           use Net::DNS::SEC;
           $sigrr = create Net::DNS::RR::SIG( $string, $keypath,
                                               sigval => 10    # minutes
                                               );

           $sigrr->verify( $string, $keyrr ) || die $sigrr->vrfyerrstr;
           $sigrr->verify( $packet, $keyrr ) || die $sigrr->vrfyerrstr;

DESCRIPTION

       Class for DNS digital signature (SIG) resource records.

       In addition to the regular methods inherited from Net::DNS::RR the class contains a method
       to sign packets and scalar data strings using private keys (create) and a method for
       verifying signatures.

       The SIG RR is an implementation of RFC2931.  See Net::DNS::RR::RRSIG for an implementation
       of RFC4034.

METHODS

       The available methods are those inherited from the base class augmented by the type-
       specific methods defined in this package.

       Use of undocumented package features or direct access to internal data structures is
       discouraged and could result in program termination or other unpredictable behaviour.

   algorithm
           $algorithm = $rr->algorithm;

       The algorithm number field identifies the cryptographic algorithm used to create the
       signature.

       algorithm() may also be invoked as a class method or simple function to perform mnemonic
       and numeric code translation.

   sigexpiration and siginception times
   sigex sigin sigval
           $expiration = $rr->sigexpiration;
           $expiration = $rr->sigexpiration( $value );

           $inception = $rr->siginception;
           $inception = $rr->siginception( $value );

       The signature expiration and inception fields specify a validity time interval for the
       signature.

       The value may be specified by a string with format 'yyyymmddhhmmss' or a Perl time()
       value.

       Return values are dual-valued, providing either a string value or numerical Perl time()
       value.

   keytag
           $keytag = $rr->keytag;
           $rr->keytag( $keytag );

       The keytag field contains the key tag value of the KEY RR that validates this signature.

   signame
           $signame = $rr->signame;
           $rr->signame( $signame );

       The signer name field value identifies the owner name of the KEY RR that a validator is
       supposed to use to validate this signature.

   signature
   sig
           $sig = $rr->sig;
           $rr->sig( $sig );

       The Signature field contains the cryptographic signature that covers the SIG RDATA
       (excluding the Signature field) and the subject data.

   sigbin
           $sigbin = $rr->sigbin;
           $rr->sigbin( $sigbin );

       Binary representation of the cryptographic signature.

   create
       Create a signature over scalar data.

           use Net::DNS::SEC;

           $keypath = '/home/olaf/keys/Kbla.foo.+001+60114.private';

           $sigrr = create Net::DNS::RR::SIG( $data, $keypath );

           $sigrr = create Net::DNS::RR::SIG( $data, $keypath,
                                               sigval => 10
                                               );
           $sigrr->print;

           # Alternatively use Net::DNS::SEC::Private

           $private = Net::DNS::SEC::Private->new($keypath);

           $sigrr= create Net::DNS::RR::SIG( $data, $private );

       create() is an alternative constructor for a SIG RR object.

       This method returns a SIG with the signature over the data made with the private key
       stored in the key file.

       The first argument is a scalar that contains the data to be signed.

       The second argument is a string which specifies the path to a file containing the private
       key as generated with dnssec-keygen, a program that comes with the ISC BIND distribution.

       The optional remaining arguments consist of ( name => value ) pairs as follows:

               sigin  => 20171201010101,       # signature inception
               sigex  => 20171201011101,       # signature expiration
               sigval => 10,                   # validity window (minutes)

       The sigin and sigex values may be specified as Perl time values or as a string with the
       format 'yyyymmddhhmmss'. The default for sigin is the time of signing.

       The sigval argument specifies the signature validity window in minutes ( sigex = sigin +
       sigval ).

       By default the signature is valid for 10 minutes.

       •   Do not change the name of the file generated by dnssec-keygen, the create method uses
           the filename as generated by dnssec-keygen to determine the keyowner, algorithm and
           the keyid (keytag).

   verify
           $verify = $sigrr->verify( $data, $keyrr );
           $verify = $sigrr->verify( $data, [$keyrr, $keyrr2, $keyrr3] );

       The verify() method performs SIG0 verification of the specified data against the signature
       contained in the $sigrr object itself using the public key in $keyrr.

       If a reference to a Net::DNS::Packet is supplied, the method performs a SIG0 verification
       on the packet data.

       The second argument can either be a Net::DNS::RR::KEYRR object or a reference to an array
       of such objects. Verification will return successful as soon as one of the keys in the
       array leads to positive validation.

       Returns false on error and sets $sig->vrfyerrstr

   vrfyerrstr
           $sig0 = $packet->sigrr || die 'not signed';
           print $sig0->vrfyerrstr unless $sig0->verify( $packet, $keyrr );

           $sigrr->verify( $packet, $keyrr ) || die $sigrr->vrfyerrstr;

REMARKS

       The code is not optimised for speed.

       If this code is still around in 2100 (not a leap year) you will need to check for proper
       handling of times ...

ACKNOWLEDGMENTS

       Andy Vaskys (Network Associates Laboratories) supplied the code for handling RSA with SHA1
       (Algorithm 5).

       T.J. Mather, the Crypt::OpenSSL::DSA maintainer, for his quick responses to bug report and
       feature requests.

COPYRIGHT

       Copyright (c)2001-2005 RIPE NCC,   Olaf M. Kolkman

       Copyright (c)2007-2008 NLnet Labs, Olaf M. Kolkman

       Portions Copyright (c)2014 Dick Franks

       All rights reserved.

       Package template (c)2009,2012 O.M.Kolkman and R.W.Franks.

LICENSE

       Permission to use, copy, modify, and distribute this software and its documentation for
       any purpose and without fee is hereby granted, provided that the above copyright notice
       appear in all copies and that both that copyright notice and this permission notice appear
       in supporting documentation, and that the name of the author not be used in advertising or
       publicity pertaining to distribution of the software without specific prior written
       permission.

       THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
       INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
       PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
       FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
       OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
       DEALINGS IN THE SOFTWARE.

NAME

SYNOPSIS

DESCRIPTION

METHODS

REMARKS

ACKNOWLEDGMENTS

COPYRIGHT

LICENSE

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