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This is a command line Java tool for doing DNSSEC response
validatation against a single authoritative DNS server.
usage: java -jar dnssecvaltool.jar [..options..]
server: the DNS server to query.
query: a name [type [flags]] string.
query_file: a list of queries, one query per line.
count: send up to'count' queries, then stop.
dnskey_file: a file containing DNSKEY RRs to trust.
dnskey_query: query 'server' for DNSKEY at given name to trust,
may repeat
error_file: write DNSSEC validation failure details to this file
The DNSSECValTool needs a server to query ('server'), a query or list
of queries ('query' or 'query_file'), and a set of DNSKEYs to trust
('dnskey_file' or 'dnskey_query') -- these keys MUST be the ones used
to sign everything in the responses.
By default it logs everything to stdout. DNSSEC validation errors
(which is most of the output) can be redirected to a file (which will
be appended to if it already exists).
Note that the DNSSECValTool will skip queries if the qname isn't a
subdomain (or matches) the names of the DNSKEYs that have been added.
This is a file of one query per line, with a query formatted as:
qname [qtype] [qclass] [flags]
For example: ns +ad a IN +do
The DO bit is redundant since all queries will be made with the DO bit
Note: at the moment, flags are ignored.
The is a list of DNSKEYs in zone file format. It will ignore zone
file comments and non-DNSKEY records, so you can just use dig output:
dig @0 edu dnskey +dnssec > keys
dig @0 net dnskey +dnssec >> keys
For each one of these, do a DNSKEY query to the server for that name,
and add the resultant keys to the set of trusted keys.
Generating Queries
The query files are basically the same as those used by the
dnsreconciler tool, so similar techniques can be used to query names
out of ISFs, etc. Here is a little perl code that will generate
queries for domain.tld, domain_.tld, and nameserver.tld for "EDU"
#! /usr/bin/perl
while (<>) {
# parse domain table lines
/^i A / && do {
@fields = split();
$dn = $fields[3];
($dom, $tld) = split(/\./, $dn, 2);
next if $tld ne "EDU";
print "$dn. A\n";
print "${dom}_.$tld. A\n";
# parse nameserver table lines
/^i B / && do {
@fields = split();
$ns = $fields[3];
print "$ns. A\n";
1. Query "", fetching the .edu keys directly from
that server. Use queries.txt for the queries, and log all DNSSEC
validation failures to 'dnssecvaltool_errors.log'.
java -jar dnssecvaltool.jar \
dnskey_query=edu \
query_file=queries.txt \
2. Query localhost with a single query for edu/soa, using stored keys
in the file 'keys'. Validation failures will be logged to stdout.
java -jar dnssecvaltool.jar server= \
dnskey_file=keys \
query="edu soa"
3. Query "", fetching the .gov keys directly from
that server, then query for
java -jar dnssecvaltool.jar \
dnskey_query=gov \
query=" a"