NLnet Labs > Net-DNS-SEC-0.19 > Net::DNS::RR::SIG

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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');

    $rrsig = create Net::DNS::RR::SIG( $string, $keypath,
                                        sigval => 60            # minutes
                                        );

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

typecovered

    $typecovered = $rr->typecovered;

The typecovered field identifies the type of the RRset that is covered by this RRSIG record.

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.

labels

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

The labels field specifies the number of labels in the original RRSIG RR owner name.

orgttl

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

The original TTL field specifies the TTL of the covered RRset as it appears in the authoritative zone.

sigexpiration and siginception time

    $expiration = $rr->sigexpiration;
    $inception = $rr->siginception;

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.

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

        $signature = $rr->signature;

The Signature field contains the cryptographic signature that covers the RRSIG RDATA (excluding the Signature field) and the RRset specified by the RRSIG owner name, RRSIG class, and RRSIG type covered fields.

sigbin

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

Binary representation of the cryptographic signature.

create

Create a signature over scalar data.

    $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,
                                        sigin => 20130901010101
                                        );
    $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 => 20130901010101, # signature inception sigex => 20130901011101, # signature expiration sigval => 10, # signature validity

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 ). Sigval wins if sigex is also specified.

By default the signature is valid for 10 minutes.

Notes:

verify and vrfyerrstr

    $sigrr->verify( $data, $keyrr ) || croak $sigrr->vrfyerrstr;
    $sigrr->verify( $data, [$keyrr, $keyrr2, $keyrr3] )
                        || croak $sigrr->vrfyerrstr;

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

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 0 on error and sets $sig->vrfyerrstr

Example

    $sig0 = $packet->pop('additional');
    print $sig0->vrfyerrstr unless $sig0->verify( $packet, $keyrr );

Remarks ^

The code is not optimized for speed.

TODO ^

If this code is still around in 2100 (not a leapyear) 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, <tjmather@tjmather.com>, 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

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 AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS; IN NO EVENT SHALL AUTHOR BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

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

SEE ALSO ^

perl, Net::DNS, Net::DNS::RR, Net::DNS::SEC, RFC4034, RFC3755, RFC2535, RFC2931, RFC3110, RFC3008, Crypt::OpenSSL::DSA, Crypt::OpenSSL::RSA

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