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.TH gnutls-cli 1 "25 May 2019" "3.6.8" "User Commands"

.\"

.\" DO NOT EDIT THIS FILE (in-mem file)

.\"

.\" It has been AutoGen-ed

.\" From the definitions ../../src/cli-args.def.tmp

.\" and the template file agman-cmd.tpl

.SH NAME

\f\*[B-Font]gnutls-cli\fP

\- GnuTLS client

.SH SYNOPSIS

\f\*[B-Font]gnutls-cli\fP

.\" Mixture of short (flag) options and long options

[\f\*[B-Font]\-flags\f[]]

[\f\*[B-Font]\-flag\f[] [\f\*[I-Font]value\f[]]]

[\f\*[B-Font]\-\-option-name\f[][[=| ]\f\*[I-Font]value\f[]]]

[hostname]

.sp \n(Ppu

.ne 2

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

.sp \n(Ppu

.ne 2

.SH "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.

.SH "OPTIONS"

.TP

.NOP \f\*[B-Font]\-d\f[] \f\*[I-Font]number\f[], \f\*[B-Font]\-\-debug\f[]=\f\*[I-Font]number\f[]

Enable debugging.

This option takes an integer number as its argument.

The value of

\f\*[I-Font]number\f[]

is constrained to being:

.in +4

.nf

.na

in the range  0 through 9999

.fi

.in -4

.sp

Specifies the debug level.

.TP

.NOP \f\*[B-Font]\-V\f[], \f\*[B-Font]\-\-verbose\f[]

More verbose output.

This option may appear an unlimited number of times.

.sp

.TP

.NOP \f\*[B-Font]\-\-tofu\f[], \f\*[B-Font]\-\-no\-tofu\f[]

Enable trust on first use authentication.

The \fIno\-tofu\fP form will disable the option.

.sp

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.

.TP

.NOP \f\*[B-Font]\-\-strict\-tofu\f[], \f\*[B-Font]\-\-no\-strict\-tofu\f[]

Fail to connect if a certificate is unknown or a known certificate has changed.

The \fIno\-strict\-tofu\fP form will disable the option.

.sp

This option will perform authentication as with option \--tofu; however, no questions shall be asked whatsoever, neither to accept an unknown certificate nor a changed one.

.TP

.NOP \f\*[B-Font]\-\-dane\f[], \f\*[B-Font]\-\-no\-dane\f[]

Enable DANE certificate verification (DNSSEC).

The \fIno\-dane\fP form will disable the option.

.sp

This option will, in addition to certificate authentication using 

the trusted CAs, verify the server certificates using on the DANE information

available via DNSSEC.

.TP

.NOP \f\*[B-Font]\-\-local\-dns\f[], \f\*[B-Font]\-\-no\-local\-dns\f[]

Use the local DNS server for DNSSEC resolving.

The \fIno\-local\-dns\fP form will disable the option.

.sp

This option will use the local DNS server for DNSSEC.

This is disabled by default due to many servers not allowing DNSSEC.

.TP

.NOP \f\*[B-Font]\-\-ca\-verification\f[], \f\*[B-Font]\-\-no\-ca\-verification\f[]

Enable CA certificate verification.

The \fIno\-ca\-verification\fP form will disable the option.

This option is enabled by default.

.sp

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

.TP

.NOP \f\*[B-Font]\-\-ocsp\f[], \f\*[B-Font]\-\-no\-ocsp\f[]

Enable OCSP certificate verification.

The \fIno\-ocsp\fP form will disable the option.

.sp

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

.TP

.NOP \f\*[B-Font]\-r\f[], \f\*[B-Font]\-\-resume\f[]

Establish a session and resume.

.sp

Connect, establish a session, reconnect and resume.

.TP

.NOP \f\*[B-Font]\-\-earlydata\f[]=\f\*[I-Font]string\f[]

Send early data on resumption from the specified file.

.sp

.TP

.NOP \f\*[B-Font]\-e\f[], \f\*[B-Font]\-\-rehandshake\f[]

Establish a session and rehandshake.

.sp

Connect, establish a session and rehandshake immediately.

.TP

.NOP \f\*[B-Font]\-\-sni\-hostname\f[]=\f\*[I-Font]string\f[]

Server's hostname for server name indication extension.

.sp

Set explicitly the server name used in the TLS server name indication extension. That is useful when testing with servers setup on different DNS name than the intended. If not specified, the provided hostname is used. Even with this option server certificate verification still uses the hostname passed on the main commandline. Use \--verify-hostname to change this.

.TP

.NOP \f\*[B-Font]\-\-verify\-hostname\f[]=\f\*[I-Font]string\f[]

Server's hostname to use for validation.

.sp

Set explicitly the server name to be used when validating the server's certificate.

.TP

.NOP \f\*[B-Font]\-s\f[], \f\*[B-Font]\-\-starttls\f[]

Connect, establish a plain session and start TLS.

.sp

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

.TP

.NOP \f\*[B-Font]\-\-app-proto\f[]

This is an alias for the \fI--starttls-proto\fR option.

.TP

.NOP \f\*[B-Font]\-\-starttls\-proto\f[]=\f\*[I-Font]string\f[]

The application protocol to be used to obtain the server's certificate (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.

.sp

Specify the application layer protocol for STARTTLS. If the protocol is supported, gnutls-cli will proceed to the TLS negotiation.

.TP

.NOP \f\*[B-Font]\-u\f[], \f\*[B-Font]\-\-udp\f[]

Use DTLS (datagram TLS) over UDP.

.sp

.TP

.NOP \f\*[B-Font]\-\-mtu\f[]=\f\*[I-Font]number\f[]

Set MTU for datagram TLS.

This option takes an integer number as its argument.

The value of

\f\*[I-Font]number\f[]

is constrained to being:

.in +4

.nf

.na

in the range  0 through 17000

.fi

.in -4

.sp

.TP

.NOP \f\*[B-Font]\-\-crlf\f[]

Send CR LF instead of LF.

.sp

.TP

.NOP \f\*[B-Font]\-\-fastopen\f[]

Enable TCP Fast Open.

.sp

.TP

.NOP \f\*[B-Font]\-\-x509fmtder\f[]

Use DER format for certificates to read from.

.sp

.TP

.NOP \f\*[B-Font]\-\-print\-cert\f[]

Print peer's certificate in PEM format.

.sp

.TP

.NOP \f\*[B-Font]\-\-save\-cert\f[]=\f\*[I-Font]string\f[]

Save the peer's certificate chain in the specified file in PEM format.

.sp

.TP

.NOP \f\*[B-Font]\-\-save\-ocsp\f[]=\f\*[I-Font]string\f[]

Save the peer's OCSP status response in the provided file.

.sp

.TP

.NOP \f\*[B-Font]\-\-save\-server\-trace\f[]=\f\*[I-Font]string\f[]

Save the server-side TLS message trace in the provided file.

.sp

.TP

.NOP \f\*[B-Font]\-\-save\-client\-trace\f[]=\f\*[I-Font]string\f[]

Save the client-side TLS message trace in the provided file.

.sp

.TP

.NOP \f\*[B-Font]\-\-dh\-bits\f[]=\f\*[I-Font]number\f[]

The minimum number of bits allowed for DH.

This option takes an integer number as its argument.

.sp

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.

.TP

.NOP \f\*[B-Font]\-\-priority\f[]=\f\*[I-Font]string\f[]

Priorities string.

.sp

TLS algorithms and protocols to enable. You can

use predefined sets of ciphersuites such as PERFORMANCE,

NORMAL, PFS, SECURE128, SECURE256. The default is NORMAL.

.sp

Check  the  GnuTLS  manual  on  section  \(lqPriority strings\(rq for more

information on the allowed keywords

.TP

.NOP \f\*[B-Font]\-\-x509cafile\f[]=\f\*[I-Font]string\f[]

Certificate file or PKCS #11 URL to use.

.sp

.TP

.NOP \f\*[B-Font]\-\-x509crlfile\f[]=\f\*[I-Font]file\f[]

CRL file to use.

.sp

.TP

.NOP \f\*[B-Font]\-\-x509keyfile\f[]=\f\*[I-Font]string\f[]

X.509 key file or PKCS #11 URL to use.

.sp

.TP

.NOP \f\*[B-Font]\-\-x509certfile\f[]=\f\*[I-Font]string\f[]

X.509 Certificate file or PKCS #11 URL to use.

This option must appear in combination with the following options:

x509keyfile.

.sp

.TP

.NOP \f\*[B-Font]\-\-srpusername\f[]=\f\*[I-Font]string\f[]

SRP username to use.

.sp

.TP

.NOP \f\*[B-Font]\-\-srppasswd\f[]=\f\*[I-Font]string\f[]

SRP password to use.

.sp

.TP

.NOP \f\*[B-Font]\-\-pskusername\f[]=\f\*[I-Font]string\f[]

PSK username to use.

.sp

.TP

.NOP \f\*[B-Font]\-\-pskkey\f[]=\f\*[I-Font]string\f[]

PSK key (in hex) to use.

.sp

.TP

.NOP \f\*[B-Font]\-p\f[] \f\*[I-Font]string\f[], \f\*[B-Font]\-\-port\f[]=\f\*[I-Font]string\f[]

The port or service to connect to.

.sp

.TP

.NOP \f\*[B-Font]\-\-insecure\f[]

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

.sp

.TP

.NOP \f\*[B-Font]\-\-verify\-allow\-broken\f[]

Allow broken algorithms, such as MD5 for certificate verification.

.sp

.TP

.NOP \f\*[B-Font]\-\-ranges\f[]

Use length-hiding padding to prevent traffic analysis.

.sp

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

.sp

.B

NOTE: THIS OPTION IS DEPRECATED

.TP

.NOP \f\*[B-Font]\-\-benchmark\-ciphers\f[]

Benchmark individual ciphers.

.sp

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.

.TP

.NOP \f\*[B-Font]\-\-benchmark\-tls\-kx\f[]

Benchmark TLS key exchange methods.

.sp

.TP

.NOP \f\*[B-Font]\-\-benchmark\-tls\-ciphers\f[]

Benchmark TLS ciphers.

.sp

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.

.TP

.NOP \f\*[B-Font]\-l\f[], \f\*[B-Font]\-\-list\f[]

Print a list of the supported algorithms and modes.

This option must not appear in combination with any of the following options:

port.

.sp

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

.TP

.NOP \f\*[B-Font]\-\-priority\-list\f[]

Print a list of the supported priority strings.

.sp

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

.TP

.NOP \f\*[B-Font]\-\-noticket\f[]

Don't allow session tickets.

.sp

Disable the request of receiving of session tickets under TLS1.2 or earlier

.TP

.NOP \f\*[B-Font]\-\-srtp\-profiles\f[]=\f\*[I-Font]string\f[]

Offer SRTP profiles.

.sp

.TP

.NOP \f\*[B-Font]\-\-alpn\f[]=\f\*[I-Font]string\f[]

Application layer protocol.

This option may appear an unlimited number of times.

.sp

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

.TP

.NOP \f\*[B-Font]\-b\f[], \f\*[B-Font]\-\-heartbeat\f[]

Activate heartbeat support.

.sp

.TP

.NOP \f\*[B-Font]\-\-recordsize\f[]=\f\*[I-Font]number\f[]

The maximum record size to advertize.

This option takes an integer number as its argument.

The value of

\f\*[I-Font]number\f[]

is constrained to being:

.in +4

.nf

.na

in the range  0 through 4096

.fi

.in -4

.sp

.TP

.NOP \f\*[B-Font]\-\-disable\-sni\f[]

Do not send a Server Name Indication (SNI).

.sp

.TP

.NOP \f\*[B-Font]\-\-disable\-extensions\f[]

Disable all the TLS extensions.

.sp

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

.sp

.B

NOTE: THIS OPTION IS DEPRECATED

.TP

.NOP \f\*[B-Font]\-\-single\-key\-share\f[]

Send a single key share under TLS1.3.

.sp

This option switches the default mode of sending multiple

key shares, to send a single one (the top one).

.TP

.NOP \f\*[B-Font]\-\-post\-handshake\-auth\f[]

Enable post-handshake authentication under TLS1.3.

.sp

This option enables post-handshake authentication when under TLS1.3.

.TP

.NOP \f\*[B-Font]\-\-inline\-commands\f[]

Inline commands of the form ^<cmd>^.

.sp

Enable inline commands of the form ^<cmd>^. The inline commands are expected to be in a line by themselves. The available commands are: resume, rekey1 (local rekey), rekey (rekey on both peers) and renegotiate.

.TP

.NOP \f\*[B-Font]\-\-inline\-commands\-prefix\f[]=\f\*[I-Font]string\f[]

Change the default delimiter for inline commands..

.sp

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

.TP

.NOP \f\*[B-Font]\-\-provider\f[]=\f\*[I-Font]file\f[]

Specify the PKCS #11 provider library.

.sp

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

.TP

.NOP \f\*[B-Font]\-\-fips140\-mode\f[]

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

.sp

.TP

.NOP \f\*[B-Font]\-\-logfile\f[]=\f\*[I-Font]string\f[]

Redirect informational messages to a specific file..

.sp

.TP

.NOP \f\*[B-Font]\-\-keymatexport\f[]=\f\*[I-Font]string\f[]

Label used for exporting keying material.

.sp

.TP

.NOP \f\*[B-Font]\-\-keymatexportsize\f[]=\f\*[I-Font]number\f[]

Size of the exported keying material.

This option takes an integer number as its argument.

.sp

.TP

.NOP \f\*[B-Font]\-h\f[], \f\*[B-Font]\-\-help\f[]

Display usage information and exit.

.TP

.NOP \f\*[B-Font]\-\&!\f[], \f\*[B-Font]\-\-more-help\f[]

Pass the extended usage information through a pager.

.TP

.NOP \f\*[B-Font]\-v\f[] [{\f\*[I-Font]v|c|n\f[] \f\*[B-Font]\-\-version\f[] [{\f\*[I-Font]v|c|n\f[]}]}]

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.

.PP

.SH EXAMPLES

.br

\fBConnecting using PSK authentication\fP

.br

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. 

.br

.in +4

.nf

$ ./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:

.in -4

.fi

By keeping the \-\-pskusername parameter and removing the \-\-pskkey parameter, it will query only for the password during the handshake. 

.sp

.br

\fBConnecting to STARTTLS services\fP

.br

.sp

You could also use the client to connect to services with starttls capability.

.br

.in +4

.nf

$ gnutls\-cli \-\-starttls\-proto smtp \-\-port 25 localhost

.in -4

.fi

.sp

.br

\fBListing ciphersuites in a priority string\fP

.br

To list the ciphersuites in a priority string:

.br

.in +4

.nf

$ ./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

.sp

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

.in -4

.fi

.sp

.br

\fBConnecting using a PKCS #11 token\fP

.br

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.

.sp

Those can be found using "p11tool \-\-list\-tokens" and then listing all the objects in the

needed token, and using the appropriate.

.br

.in +4

.nf

$ p11tool \-\-list\-tokens

.sp

Token 0:

URL: pkcs11:model=PKCS15;manufacturer=MyMan;serial=1234;token=Test

Label: Test

Manufacturer: EnterSafe

Model: PKCS15

Serial: 1234

.sp

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

.sp

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

.sp

$ 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

.sp

$ gnutls\-cli www.example.com \-\-x509keyfile $MYKEY \-\-x509certfile $MYCERT

.in -4

.fi

Notice that the private key only differs from the certificate in the type.

.SH "EXIT STATUS"

One of the following exit values will be returned:

.TP

.NOP 0 " (EXIT_SUCCESS)"

Successful program execution.

.TP

.NOP 1 " (EXIT_FAILURE)"

The operation failed or the command syntax was not valid.

.TP

.NOP 70 " (EX_SOFTWARE)"

libopts had an internal operational error.  Please report

it to autogen-users@lists.sourceforge.net.  Thank you.

.PP

.SH "SEE ALSO"

gnutls\-cli\-debug(1), gnutls\-serv(1)

.SH "AUTHORS"

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

.SH "COPYRIGHT"

Copyright (C) 2000-2019 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.

.SH "BUGS"

Please send bug reports to: bugs@gnutls.org

.SH "NOTES"

This manual page was \fIAutoGen\fP-erated from the \fBgnutls-cli\fP

option definitions.