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gnutls-cli(1)			 User Commands			 gnutls-cli(1)

NAME
       gnutls-cli - GnuTLS client

SYNOPSIS
       gnutls-cli  [-flags] [-flag [value]] [--option-name[[=| ]value]]	[host-
       name]

       Operands	and options may	be intermixed.	They will be reordered.

DESCRIPTION
       Simple client program to	set up a TLS connection	 to  some  other  com-
       puter.  It sets up a TLS	connection and forwards	data from the standard
       input to	the secured socket and vice versa.

OPTIONS
       -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.

       --tofu, --no-tofu
	      Enable trust on first use	authentication.	 The no-tofu form will
	      disable the option.

	      This option will,	in addition to certificate authentication,
	      perform authentication based on previously seen public keys, a
	      model similar to SSH authentication. Note	that when tofu is
	      specified	(PKI) and DANE authentication will become advisory to
	      assist the public	key acceptance process.

       --strict-tofu, --no-strict-tofu
	      Fail to connect if a known certificate has changed.  The
	      no-strict-tofu form will disable the option.

	      This option will perform authentication as with option --tofu;
	      however, while --tofu asks whether to trust a changed public
	      key, this	option will fail in case of public key changes.

       --dane, --no-dane
	      Enable DANE certificate verification (DNSSEC).  The no-dane form
	      will disable the option.

	      This option will,	in addition to certificate authentication us-
	      ing the trusted CAs, verify the server certificates using	on the
	      DANE information available via DNSSEC.

       --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.

       --ca-verification, --no-ca-verification
	      Enable CA	certificate verification.  The no-ca-verification form
	      will disable the option.	This option is enabled by default.

	      This option can be used to enable	or disable CA certificate ver-
	      ification. It is to be used with the --dane or --tofu options.

       --ocsp, --no-ocsp
	      Enable OCSP certificate verification.  The no-ocsp form will
	      disable the option.

	      This option will enable verification of the peer's certificate
	      using ocsp

       -r, --resume
	      Establish	a session and resume.

	      Connect, establish a session, reconnect and resume.

       -e, --rehandshake
	      Establish	a session and rehandshake.

	      Connect, establish a session and rehandshake immediately.

       --sni-hostname=string
	      Server's hostname	for server name	indication extension.

	      Set explicitly the server	name used in the TLS server name indi-
	      cation extension.	That is	useful when testing with servers setup
	      on different DNS name than the intended. If not specified, the
	      provided hostname	is used.

       -s, --starttls
	      Connect, establish a plain session and start TLS.

	      The TLS session will be initiated	when EOF or a SIGALRM is re-
	      ceived.

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

       --starttls-proto=string
	      The application protocol to be used to obtain the	server's cer-
	      tificate (https, ftp, smtp, imap,	ldap, xmpp, lmtp, pop3,	nntp,
	      sieve, postgres).	 This option must not appear in	combination
	      with any of the following	options: starttls.

	      Specify the application layer protocol for STARTTLS. If the pro-
	      tocol is supported, gnutls-cli will proceed to the TLS negotia-
	      tion.

       -u, --udp
	      Use DTLS (datagram TLS) over UDP.

       --mtu=number
	      Set MTU for datagram TLS.	 This option takes an integer number
	      as its argument.	The value of number is constrained to being:
		  in the range	0 through 17000

       --crlf Send CR LF instead of LF.

       --fastopen
	      Enable TCP Fast Open.

       --x509fmtder
	      Use DER format for certificates to read from.

       -f, --fingerprint
	      Send the openpgp fingerprint, instead of the key.

       --print-cert
	      Print peer's certificate in PEM format.

       --save-cert=string
	      Save the peer's certificate chain	in the specified file in PEM
	      format.

       --save-ocsp=string
	      Save the peer's OCSP status response in the provided file.

       --dh-bits=number
	      The minimum number of bits allowed for DH.  This option takes an
	      integer number as	its argument.

	      This option sets the minimum number of bits allowed for a
	      Diffie-Hellman key exchange. You may want	to lower the default
	      value if the peer	sends a	weak prime and you get an connection
	      error with unacceptable prime.

       --priority=string
	      Priorities string.

	      TLS algorithms and protocols to enable. You can use predefined
	      sets of ciphersuites such	as PERFORMANCE,	NORMAL,	PFS, SE-
	      CURE128, SECURE256. The default is NORMAL.

	      Check  the  GnuTLS  manual  on  section  "Priority strings" for
	      more information on the allowed keywords

       --x509cafile=string
	      Certificate file or PKCS #11 URL to use.

       --x509crlfile=file
	      CRL file to use.

       --pgpkeyfile=file
	      PGP Key file to use.

       --pgpkeyring=file
	      PGP Key ring file	to use.

       --pgpcertfile=file
	      PGP Public Key (certificate) file	to use.	 This option must ap-
	      pear in combination with the following options: pgpkeyfile.

       --x509keyfile=string
	      X.509 key	file or	PKCS #11 URL to	use.

       --x509certfile=string
	      X.509 Certificate	file or	PKCS #11 URL to	use.  This option must
	      appear in	combination with the following options:	x509keyfile.

       --pgpsubkey=string
	      PGP subkey to use	(hex or	auto).

       --srpusername=string
	      SRP username to use.

       --srppasswd=string
	      SRP password to use.

       --pskusername=string
	      PSK username to use.

       --pskkey=string
	      PSK key (in hex) to use.

       -p string, --port=string
	      The port or service to connect to.

       --insecure
	      Don't abort program if server certificate	can't be validated.

       --ranges
	      Use length-hiding	padding	to prevent traffic analysis.

	      When possible (e.g., when	using CBC ciphersuites), use length-
	      hiding padding to	prevent	traffic	analysis.

       --benchmark-ciphers
	      Benchmark	individual ciphers.

	      By default the benchmarked ciphers will utilize any capabilities
	      of the local CPU to improve performance. To test against the raw
	      software implementation set the environment variable
	      GNUTLS_CPUID_OVERRIDE to 0x1.

       --benchmark-tls-kx
	      Benchmark	TLS key	exchange methods.

       --benchmark-tls-ciphers
	      Benchmark	TLS ciphers.

	      By default the benchmarked ciphers will utilize any capabilities
	      of the local CPU to improve performance. To test against the raw
	      software implementation set the environment variable
	      GNUTLS_CPUID_OVERRIDE to 0x1.

       -l, --list
	      Print a list of the supported algorithms and modes.  This	option
	      must not appear in combination with any of the following op-
	      tions: port.

	      Print a list of the supported algorithms and modes. If a prior-
	      ity string is given then only the	enabled	ciphersuites are
	      shown.

       --priority-list
	      Print a list of the supported priority strings.

	      Print a list of the supported priority strings. The ciphersuites
	      corresponding to each priority string can	be examined using -l
	      -p.

       --noticket
	      Don't allow session tickets.

       --srtp-profiles=string
	      Offer SRTP profiles.

       --alpn=string
	      Application layer	protocol.  This	option may appear an unlimited
	      number of	times.

	      This option will set and enable the Application Layer Protocol
	      Negotiation  (ALPN) in the TLS protocol.

       -b, --heartbeat
	      Activate heartbeat support.

       --recordsize=number
	      The maximum record size to advertize.  This option takes an in-
	      teger number as its argument.  The value of number is con-
	      strained to being:
		  in the range	0 through 4096

       --disable-sni
	      Do not send a Server Name	Indication (SNI).

       --disable-extensions
	      Disable all the TLS extensions.

	      This option disables all TLS extensions. Deprecated option. Use
	      the priority string.

       --inline-commands
	      Inline commands of the form ^<cmd>^.

	      Enable inline commands of	the form ^<cmd>^. The inline commands
	      are expected to be in a line by themselves. The available	com-
	      mands are: resume	and renegotiate.

       --inline-commands-prefix=string
	      Change the default delimiter for inline commands..

	      Change the default delimiter (^) used for	inline commands. The
	      delimiter	is expected to be a single US-ASCII character (octets
	      0	- 127).	This option is only relevant if	inline commands	are
	      enabled via the inline-commands option

       --provider=file
	      Specify the PKCS #11 provider library.

	      This will	override the default options in
	      /etc/gnutls/pkcs11.conf

       --fips140-mode
	      Reports the status of the	FIPS140-2 mode in gnutls library.

       -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
       Connecting using	PSK authentication
       To connect to a server using PSK	authentication,	you need to enable the
       choice of PSK by	using a	cipher priority	parameter such as in the exam-
       ple below.
	   $ ./gnutls-cli -p 5556 localhost --pskusername psk_identity	   --pskkey 88f3824b3e5659f52d00e959bacab954b6540344	 --priority NORMAL:-KX-ALL:+ECDHE-PSK:+DHE-PSK:+PSK
	   Resolving 'localhost'...
	   Connecting to '127.0.0.1:5556'...
	   - PSK authentication.
	   - Version: TLS1.1
	   - Key Exchange: PSK
	   - Cipher: AES-128-CBC
	   - MAC: SHA1
	   - Compression: NULL
	   - Handshake was completed
	   - Simple Client Mode:
       By keeping the --pskusername parameter and removing the --pskkey	param-
       eter, it	will query only	for the	password during	the handshake.

       Connecting to STARTTLS services

       You could also use the client to	connect	to services with starttls ca-
       pability.
	   $ gnutls-cli	--starttls-proto smtp --port 25	localhost

       Listing ciphersuites in a priority string
       To list the ciphersuites	in a priority string:
	   $ ./gnutls-cli --priority SECURE192 -l
	   Cipher suites for SECURE192
	   TLS_ECDHE_ECDSA_AES_256_CBC_SHA384	      0xc0, 0x24  TLS1.2
	   TLS_ECDHE_ECDSA_AES_256_GCM_SHA384	      0xc0, 0x2e  TLS1.2
	   TLS_ECDHE_RSA_AES_256_GCM_SHA384	      0xc0, 0x30  TLS1.2
	   TLS_DHE_RSA_AES_256_CBC_SHA256	      0x00, 0x6b  TLS1.2
	   TLS_DHE_DSS_AES_256_CBC_SHA256	      0x00, 0x6a  TLS1.2
	   TLS_RSA_AES_256_CBC_SHA256		      0x00, 0x3d  TLS1.2

	   Certificate types: CTYPE-X.509
	   Protocols: VERS-TLS1.2, VERS-TLS1.1,	VERS-TLS1.0, VERS-SSL3.0, VERS-DTLS1.0
	   Compression:	COMP-NULL
	   Elliptic curves: CURVE-SECP384R1, CURVE-SECP521R1
	   PK-signatures: SIGN-RSA-SHA384, SIGN-ECDSA-SHA384, SIGN-RSA-SHA512, SIGN-ECDSA-SHA512

       Connecting using	a PKCS #11 token
       To connect to a server using a certificate and a	private	key present in
       a PKCS #11 token	you need to substitute the PKCS	11 URLs	in the
       x509certfile and	x509keyfile parameters.

       Those can be found using	"p11tool --list-tokens"	and then listing all
       the objects in the needed token,	and using the appropriate.
	   $ p11tool --list-tokens

	   Token 0:
	   URL:	pkcs11:model=PKCS15;manufacturer=MyMan;serial=1234;token=Test
	   Label: Test
	   Manufacturer: EnterSafe
	   Model: PKCS15
	   Serial: 1234

	   $ p11tool --login --list-certs "pkcs11:model=PKCS15;manufacturer=MyMan;serial=1234;token=Test"

	   Object 0:
	   URL:	pkcs11:model=PKCS15;manufacturer=MyMan;serial=1234;token=Test;object=client;type=cert
	   Type: X.509 Certificate
	   Label: client
	   ID: 2a:97:0d:58:d1:51:3c:23:07:ae:4e:0d:72:26:03:7d:99:06:02:6a

	   $ MYCERT="pkcs11:model=PKCS15;manufacturer=MyMan;serial=1234;token=Test;object=client;type=cert"
	   $ MYKEY="pkcs11:model=PKCS15;manufacturer=MyMan;serial=1234;token=Test;object=client;type=private"
	   $ export MYCERT MYKEY

	   $ gnutls-cli	www.example.com	--x509keyfile $MYKEY --x509certfile $MYCERT
       Notice that the private key only	differs	from the certificate in	the
       type.

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.

       70  (EX_SOFTWARE)
	      libopts had an internal operational error.  Please report	it to
	      autogen-users@lists.sourceforge.net.  Thank you.

SEE ALSO
       gnutls-cli-debug(1), gnutls-serv(1)

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

COPYRIGHT
       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
       Please send bug reports to: bugs@gnutls.org

NOTES
       This manual page	was AutoGen-erated from	the gnutls-cli option defini-
       tions.

3.5.13				  07 Jun 2017			 gnutls-cli(1)

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

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