NAME

       danetool - GnuTLS DANE tool

SYNOPSIS

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

       All arguments must be options.

DESCRIPTION

       Tool to generate and check DNS resource records for the DANE protocol.

OPTIONS

       -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

       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

       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

       certtool (1)

AUTHORS

COPYRIGHT

       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

       Please send bug reports to: bugs@gnutls.org