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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 computer. 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.

--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 certificate, this option will fail in case of certificate 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 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, PFS, SECURE128, 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.

--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 priority 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 constrained 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 commands are: resume and renegotiate.

--inline-commands-prefix=string
Change the default (^) used as a delimiter for inline commands.                The value is a single US-ASCII character (octets 0 - 127)..

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

-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 example 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 parameter, 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


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;object-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

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

$ gnutls-cli www.example.com --x509keyfile $MYKEY --x509certfile MYCERT
Notice that the private key only differs from the certificate in the object-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) 2000-2014 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 definitions.


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