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

NAME
       gnutls-cli - GnuTLS client

SYNOPSIS
       gnutls-cli [-flag [value]]... [--opt-name[[=| ]value]]... [hostname]

       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.

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

	      This option will, in addition to certificate authentication
	      using 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
	      Disable CA certificate verification.  The no-ca-verification
	      form will disable the option.  This option is enabled by
	      default.

	      This option will disable CA certificate verification. 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.

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

	      The TLS session will be initiated when EOF or a SIGALRM is
	      received.

       -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.

       --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.

       --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, SECURE128,
	      SECURE256.  Check	 the  GnuTLS  manual  on  section  “Priority
	      strings” for more information on 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.

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

       --x509certfile=string
	      X.509 Certificate file or PKCS #11 URL to use.

       --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 %NEW_PADDING is specified), use
	      length-hiding padding to prevent traffic analysis.

       --benchmark-ciphers
	      Benchmark individual ciphers.

       --benchmark-soft-ciphers
	      Benchmark individual software ciphers (no hw acceleration).

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

       --benchmark-tls-ciphers
	      Benchmark TLS ciphers.

       -l, --list
	      Print a list of the supported algorithms and modes.

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

       --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
	      integer 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.

       -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.

       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

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-bin/AUTHORS for a complete list.

COPYRIGHT
       Copyright (C) 2000-2012 Free Software Foundation 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: bug-gnutls@gnu.org

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

3.2.4				  31 Aug 2013			 gnutls-cli(1)
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