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Tool to generate and check DNS resource records for the DANE protocol.
The text printed is the same whether selected with the help option
(--help) or the more-help option (--more-help). more-help will print
the usage text by passing it through a pager program.
more-help is disabled on platforms without a working
fork(2) function. The PAGER environment variable is
used to select the program, defaulting to more. Both will exit
with a status code of 0.
danetool - GnuTLS DANE tool
Usage: danetool [ -<flag> [<val>] | --<name>[{=| }<val>] ]...
None:
-d, --debug=num Enable debugging
- it must be in the range:
0 to 9999
-V, --verbose More verbose output
--outfile=str Output file
--load-pubkey=str Loads a public key file
--load-certificate=str Loads a certificate file
--dlv=str Sets a DLV file
--hash=str Hash algorithm to use for signing
--check=str Check a host's DANE TLSA entry
--check-ee Check only the end-entity's certificate
--check-ca Check only the CA's certificate
--tlsa-rr Print the DANE RR data on a certificate or public key
- requires the option 'host'
--host=str Specify the hostname to be used in the DANE RR
--proto=str The protocol set for DANE data (tcp, udp etc.)
--port=str The port or service to connect to, for DANE data
--app-proto 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)
--ca Whether the provided certificate or public key is a Certificate Authority
--x509 Use the hash of the X.509 certificate, rather than the public key
--local an alias for the 'domain' option
--domain The provided certificate or public key is issued by the local domain
- enabled by default
- disabled as '--no-domain'
--local-dns Use the local DNS server for DNSSEC resolving
--insecure Do not verify any DNSSEC signature
--inder Use DER format for input certificates and private keys
--inraw an alias for the 'inder' option
--print-raw Print the received DANE data in raw format
--quiet Suppress several informational messages
Version, usage and configuration options:
-v, --version[=arg] output version information and exit
-h, --help display extended usage information and exit
-!, --more-help extended usage information passed thru pager
Options are specified by doubled hyphens and their name or by a single
hyphen and the flag character.
Tool to generate and check DNS resource records for the DANE protocol.
Please send bug reports to: <bugs@gnutls.org>
This is the “enable debugging” option. This option takes a ArgumentType.NUMBER argument. Specifies the debug level.
This is the “loads a public key file” option. This option takes a ArgumentType.STRING argument. This can be either a file or a PKCS #11 URL
This is the “loads a certificate file” option. This option takes a ArgumentType.STRING argument. This can be either a file or a PKCS #11 URL
This is the “sets a dlv file” option. This option takes a ArgumentType.STRING argument. This sets a DLV file to be used for DNSSEC verification.
This is the “hash algorithm to use for signing” option. This option takes a ArgumentType.STRING argument. Available hash functions are SHA1, RMD160, SHA256, SHA384, SHA512.
This is the “check a host’s dane tlsa entry” option. This option takes a ArgumentType.STRING argument. 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.
This is the “check only the end-entity’s certificate” option. Checks the end-entity’s certificate only. Trust anchors or CAs are not considered.
This is the “check only the ca’s certificate” option. Checks the trust anchor’s and CA’s certificate only. End-entities are not considered.
This is the “print the dane rr data on a certificate or public key” option.
This option has some usage constraints. It:
This command prints the DANE RR data needed to enable DANE on a DNS server.
This is the “specify the hostname to be used in the dane rr” option. This option takes a ArgumentType.STRING argument Hostname. This command sets the hostname for the DANE RR.
This is the “the protocol set for dane data (tcp, udp etc.)” option. This option takes a ArgumentType.STRING argument Protocol. This command specifies the protocol for the service set in the DANE data.
This is an alias for the starttls-proto option,
see the starttls-proto option documentation.
This is the “the application protocol to be used to obtain the server’s certificate (https, ftp, smtp, imap, ldap, xmpp, lmtp, pop3, nntp, sieve, postgres)” option. This option takes a ArgumentType.STRING argument. 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.
This is the “whether the provided certificate or public key is a certificate authority” option. Marks the DANE RR as a CA certificate if specified.
This is the “use the hash of the x.509 certificate, rather than the public key” option. 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,
see the domain option documentation.
This is the “the provided certificate or public key is issued by the local domain” option.
This option has some usage constraints. It:
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.
This is the “use the local dns server for dnssec resolving” option. This option will use the local DNS server for DNSSEC. This is disabled by default due to many servers not allowing DNSSEC.
This is the “do not verify any dnssec signature” option. Ignores any DNSSEC signature verification results.
This is the “use der format for input certificates and private keys” 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,
see the inder option documentation.
This is the “print the received dane data in raw format” option. This option will print the received DANE data.
This is the “suppress several informational messages” option. In that case on the exit code can be used as an indication of verification success
This is the “output version information and exit” option. This option takes a ArgumentType.KEYWORD argument. 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.
This is the “display extended usage information and exit” option. Display usage information and exit.
This is the “extended usage information passed thru pager” option. Pass the extended usage information through a pager.
One of the following exit values will be returned:
Successful program execution.
The operation failed or the command syntax was not valid.
certtool (1)
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
Previous: ocsptool Invocation, Up: More on certificate authentication [Contents][Index]