danetool(1)                     User Commands                    danetool(1)

NAME         top

       danetool - GnuTLS DANE tool

SYNOPSIS         top

       danetool [-flags] [-flag [value]] [--option-name[[=| ]value]]

       All arguments must be options.

DESCRIPTION         top

       Tool to generate and check DNS resource records for the DANE

OPTIONS         top

       -d number, --debug=number
              Enable debugging.  This option takes an integer number as its
              argument.  The value of number is constrained to being:
                  in the range  0 through 9999

              Specifies the debug level.

       -V, --verbose
              More verbose output.  This option may appear an unlimited
              number of times.

              Input file.

              Output file.

              Loads a public key file.

              This can be either a file or a PKCS #11 URL

              Loads a certificate file.

              This can be either a file or a PKCS #11 URL

              Sets a DLV file.

              This sets a DLV file to be used for DNSSEC verification.

              Hash algorithm to use for signing.

              Available hash functions are SHA1, RMD160, SHA256, SHA384,

              Check a host's DANE TLSA entry.

              Obtains the DANE TLSA entry from the given hostname and prints
              information. Note that the actual certificate of the host can
              be provided using --load-certificate, otherwise danetool will
              connect to the server to obtain it. The exit code on
              verification success will be zero.

              Check only the end-entity's certificate.

              Checks the end-entity's certificate only. Trust anchors or CAs
              are not considered.

              Check only the CA's certificate.

              Checks the trust anchor's and CA's certificate only. End-
              entities are not considered.

              Print the DANE RR data on a certificate or public key.  This
              option must appear in combination with the following options:

              This command prints the DANE RR data needed to enable DANE on
              a DNS server.

              Specify the hostname to be used in the DANE RR.

              This command sets the hostname for the DANE RR.

              The protocol set for DANE data (tcp, udp etc.).

              This command specifies the protocol for the service set in the
              DANE data.

              The port or service to connect to, for DANE data.

              This is an alias for the --starttls-proto option.

              The application protocol to be used to obtain the server's
              certificate (https, ftp, smtp, imap, ldap, xmpp).

              When the server's certificate isn't provided danetool will
              connect to the server to obtain the certificate. In that case
              it is required to know the protocol to talk with the server
              prior to initiating the TLS handshake.

       --ca   Whether the provided certificate or public key is a
              Certificate Authority.

              Marks the DANE RR as a CA certificate if specified.

       --x509 Use the hash of the X.509 certificate, rather than the public

              This option forces the generated record to contain the hash of
              the full X.509 certificate. By default only the hash of the
              public key is used.

              This is an alias for the --domain option.

       --domain, --no-domain
              The provided certificate or public key is issued by the local
              domain.  The no-domain form will disable the option.  This
              option is enabled by default.

              DANE distinguishes certificates and public keys offered via
              the DNSSEC to trusted and local entities. This flag indicates
              that this is a domain-issued certificate, meaning that there
              could be no CA involved.

       --local-dns, --no-local-dns
              Use the local DNS server for DNSSEC resolving.  The
              no-local-dns form will disable the option.

              This option will use the local DNS server for DNSSEC.  This is
              disabled by default due to many servers not allowing DNSSEC.

              Do not verify any DNSSEC signature.

              Ignores any DNSSEC signature verification results.

       --inder, --no-inder
              Use DER format for input certificates and private keys.  The
              no-inder form will disable the option.

              The input files will be assumed to be in DER or RAW format.
              Unlike options that in PEM input would allow multiple input
              data (e.g. multiple certificates), when reading in DER format
              a single data structure is read.

              This is an alias for the --inder option.

       --print-raw, --no-print-raw
              Print the received DANE data in raw format.  The no-print-raw
              form will disable the option.

              This option will print the received DANE data.

              Suppress several informational messages.

              In that case on the exit code can be used as an indication of
              verification success

       -h, --help
              Display usage information and exit.

       -!, --more-help
              Pass the extended usage information through a pager.

       -v [{v|c|n --version [{v|c|n}]}]
              Output version of program and exit.  The default mode is `v',
              a simple version.  The `c' mode will print copyright
              information and `n' will print the full copyright notice.

EXAMPLES         top

       DANE TLSA RR generation

       To create a DANE TLSA resource record for a certificate (or public
       key) that was issued localy and may or may not be signed by a CA use
       the following command.
           $ danetool --tlsa-rr --host --load-certificate cert.pem

       To create a DANE TLSA resource record for a CA signed certificate,
       which will be marked as such use the following command.
           $ danetool --tlsa-rr --host --load-certificate cert.pem   --no-domain

       The former is useful to add in your DNS entry even if your
       certificate is signed by a CA. That way even users who do not trust
       your CA will be able to verify your certificate using DANE.

       In order to create a record for the CA signer of your certificate use
       the following.
           $ danetool --tlsa-rr --host --load-certificate cert.pem   --ca --no-domain

       To read a server's DANE TLSA entry, use:
           $ danetool --check --proto tcp --port 443

       To verify an HTTPS server's DANE TLSA entry, use:
           $ danetool --check --proto tcp --port 443 --load-certificate chain.pem

       To verify an SMTP server's DANE TLSA entry, use:
           $ danetool --check --proto tcp --starttls-proto=smtp --load-certificate chain.pem

EXIT STATUS         top

       One of the following exit values will be returned:

       0  (EXIT_SUCCESS)
              Successful program execution.

       1  (EXIT_FAILURE)
              The operation failed or the command syntax was not valid.

       70  (EX_SOFTWARE)
              libopts had an internal operational error.  Please report it
              to  Thank you.

SEE ALSO         top

           certtool (1)

AUTHORS         top

       Nikos Mavrogiannopoulos, Simon Josefsson and others; see
       /usr/share/doc/gnutls/AUTHORS for a complete list.

COPYRIGHT         top

       Copyright (C) 2000-2017 Free Software Foundation, and others all
       rights reserved.  This program is released under the terms of the GNU
       General Public License, version 3 or later.

BUGS         top

       Please send bug reports to:

NOTES         top

       This manual page was AutoGen-erated from the danetool option

COLOPHON         top

       This page is part of the GnuTLS (GnuTLS Transport Layer Security
       Library) project.  Information about the project can be found at 
       ⟨⟩.  If you have a bug report for this manual
       page, send it to  This page was obtained from the
       tarball gnutls-3.5.9.tar.xz fetched from 
       ⟨⟩ on 2017-03-13.  If you discover
       any rendering problems in this HTML version of the page, or you
       believe there is a better or more up-to-date source for the page, or
       you have corrections or improvements to the information in this
       COLOPHON (which is not part of the original manual page), send a mail

3.5.9                            12 Feb 2017                     danetool(1)