danetool(1) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLES | EXIT STATUS | SEE ALSO | AUTHORS | COPYRIGHT | BUGS | COLOPHON

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
       protocol.

OPTIONS         top

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

       Specifies the debug level.

       -V, --verbose More verbose output.

       --outfile=str Output file.

       --load-pubkey=str Loads a public key file.

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

       --load-certificate=str Loads a certificate file.

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

       --dlv=str Sets a DLV file.

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

       --hash=str Hash algorithm to use for signing.

       Available hash functions are SHA1, RMD160, SHA256, SHA384,
       SHA512.

       --check=str 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-ee Check only the end-entity's certificate.

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

       --check-ca Check only the CA's certificate.

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

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

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

       --host=hostname Specify the hostname to be used in the DANE RR.

       This command sets the hostname for the DANE RR.

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

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

       --port=str The port or service to connect to, for DANE data.

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

       --starttls-proto=str The application protocol to be used to
       obtain the server's certificate (https, ftp, smtp, imap, ldap,
       xmpp, lmtp, pop3, nntp, sieve, postgres).

       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 key.

       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.

       --local 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.

       --insecure 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.

       --inraw 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.

       --quiet Suppress several informational messages.

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

       -v arg, --version=arg 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.

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

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

EXAMPLES         top

              DANE TLSA RR generation

              To create a DANE TLSA resource record for a certificate
              (or public key) that was issued locally and may or may not
              be signed by a CA use the following command.
                  $ danetool --tlsa-rr --host www.example.com --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 www.example.com --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 www.example.com --load-certificate cert.pem   --ca --no-domain

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

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

              To verify an SMTP server's DANE TLSA entry, use:
                  $ danetool --check www.example.com --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.

SEE ALSO         top

              certtool(1)

AUTHORS         top


COPYRIGHT         top

       Copyright (C) 2020-2023 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: bugs@gnutls.org

COLOPHON         top

       This page is part of the GnuTLS (GnuTLS Transport Layer Security
       Library) project.  Information about the project can be found at
       ⟨http://www.gnutls.org/⟩.  If you have a bug report for this
       manual page, send it to bugs@gnutls.org.  This page was obtained
       from the tarball gnutls-3.8.5.tar.xz fetched from
       ⟨http://www.gnutls.org/download.html⟩ on 2024-06-14.  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 to man-pages@man7.org

3.8.5                          04 Apr 2024                   danetool(1)