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.TH gnutls-cli-debug 1 "03 Jun 2020" "3.6.14" "User Commands"

.\"

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

.\"

.\" It has been AutoGen-ed

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

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

.SH NAME

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

\- GnuTLS debug client

.SH SYNOPSIS

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

.sp \n(Ppu

.ne 2

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

.sp \n(Ppu

.ne 2

.SH "DESCRIPTION"

TLS debug client. It sets up multiple TLS connections to 

a server and queries its capabilities. It was created to assist in debugging 

GnuTLS, but it might be useful to extract a TLS server's capabilities.

It connects to a TLS server, performs tests and print the server's 

capabilities. If called with the `-V' parameter more checks will be performed.

Can be used to check for servers with special needs or bugs.

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

The port to connect to.

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 65536

.fi

.in -4

.sp

.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).

.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]\-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

.in +4

.nf

$ gnutls\-cli\-debug localhost

GnuTLS debug client 3.5.0

Checking localhost:443

                             for SSL 3.0 (RFC6101) support... yes

                        whether we need to disable TLS 1.2... no

                        whether we need to disable TLS 1.1... no

                        whether we need to disable TLS 1.0... no

                        whether %NO_EXTENSIONS is required... no

                               whether %COMPAT is required... no

                             for TLS 1.0 (RFC2246) support... yes

                             for TLS 1.1 (RFC4346) support... yes

                             for TLS 1.2 (RFC5246) support... yes

                                  fallback from TLS 1.6 to... TLS1.2

                        for RFC7507 inappropriate fallback... yes

                                     for HTTPS server name... Local

                               for certificate chain order... sorted

                  for safe renegotiation (RFC5746) support... yes

                     for Safe renegotiation support (SCSV)... no

                    for encrypt\-then\-MAC (RFC7366) support... no

                   for ext master secret (RFC7627) support... no

                           for heartbeat (RFC6520) support... no

                       for version rollback bug in RSA PMS... dunno

                  for version rollback bug in Client Hello... no

            whether the server ignores the RSA PMS version... yes

whether small records (512 bytes) are tolerated on handshake... yes

    whether cipher suites not in SSL 3.0 spec are accepted... yes

whether a bogus TLS record version in the client hello is accepted... yes

         whether the server understands TLS closure alerts... partially

            whether the server supports session resumption... yes

                      for anonymous authentication support... no

                      for ephemeral Diffie\-Hellman support... no

                   for ephemeral EC Diffie\-Hellman support... yes

                    ephemeral EC Diffie\-Hellman group info... SECP256R1

                  for AES\-128\-GCM cipher (RFC5288) support... yes

                  for AES\-128\-CCM cipher (RFC6655) support... no

                for AES\-128\-CCM\-8 cipher (RFC6655) support... no

                  for AES\-128\-CBC cipher (RFC3268) support... yes

             for CAMELLIA\-128\-GCM cipher (RFC6367) support... no

             for CAMELLIA\-128\-CBC cipher (RFC5932) support... no

                     for 3DES\-CBC cipher (RFC2246) support... yes

                  for ARCFOUR 128 cipher (RFC2246) support... yes

                                       for MD5 MAC support... yes

                                      for SHA1 MAC support... yes

                                    for SHA256 MAC support... yes

                              for ZLIB compression support... no

                     for max record size (RFC6066) support... no

                for OCSP status response (RFC6066) support... no

              for OpenPGP authentication (RFC6091) support... no

.in -4

.fi

.sp

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

.br

.in +4

.nf

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

.in -4

.fi

.sp

.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(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) 2000-2020 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-debug\fP

option definitions.