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

gnutls-serv(1)                  User Commands                 gnutls-serv(1)

NAME         top

       gnutls-serv - GnuTLS server

SYNOPSIS         top

       gnutls-serv [-flags] [-flag [value]] [--option-name[[=| ]value]]

       All arguments must be options.

DESCRIPTION         top

       Server program that listens to incoming TLS connections.

OPTIONS         top

       -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.

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

              Server name of type host_name that the server will recognise
              as its own. If the server receives client hello with different
              name, it will send a warning-level unrecognized_name alert.

       --sni-hostname-fatal
              Send fatal alert on sni-hostname mismatch.

       --alpn=string
              Specify ALPN protocol to be enabled by the server.  This
              option may appear an unlimited number of times.

              Specify the (textual) ALPN protocol for the server to use.

       --alpn-fatal
              Send fatal alert on non-matching ALPN name.

       --noticket
              Don't accept session tickets.

       -g, --generate
              Generate Diffie-Hellman parameters.

       -q, --quiet
              Suppress some messages.

       --nodb Do not use a resumption database.

       --http Act as an HTTP server.

       --echo Act as an Echo server.

       -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

       --srtp-profiles=string
              Offer SRTP profiles.

       -a, --disable-client-cert
              Do not request a client certificate.

       -r, --require-client-cert
              Require a client certificate.

              This option before 3.6.0 used to imply --verify-client-cert.
              Since 3.6.0 it will no longer verify the certificate by
              default.

       --verify-client-cert
              If a client certificate is sent then verify it..

              Do not require, but if a client certificate is sent then
              verify it and close the connection if invalid.

       -b, --heartbeat
              Activate heartbeat support.

              Regularly ping client via heartbeat extension messages

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

       --priority=string
              Priorities string.

              TLS algorithms and protocols to enable. You can use predefined
              sets of ciphersuites such as PERFORMANCE, NORMAL, SECURE128,
              SECURE256. The default is NORMAL.

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

       --dhparams=file
              DH params file to use.

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

       --x509crlfile=file
              CRL file to use.

       --pgpkeyfile=file
              PGP Key file to use.

              NOTE: THIS OPTION IS DEPRECATED

       --x509keyfile=string
              X.509 key file or PKCS #11 URL to use.  This option may appear
              an unlimited number of times.

              Specify the private key file or URI to use; it must correspond
              to the certificate specified in --x509certfile. Multiple keys
              and certificates can be specified with this option and in that
              case each occurence of keyfile must be followed by the
              corresponding x509certfile or vice-versa.

       --x509certfile=string
              X.509 Certificate file or PKCS #11 URL to use.  This option
              may appear an unlimited number of times.

              Specify the certificate file or URI to use; it must correspond
              to the key specified in --x509keyfile. Multiple keys and
              certificates can be specified with this option and in that
              case each occurence of keyfile must be followed by the
              corresponding x509certfile or vice-versa.

       --x509dsakeyfile
              This is an alias for the --x509keyfile option.

              NOTE: THIS OPTION IS DEPRECATED

       --x509dsacertfile
              This is an alias for the --x509certfile option.

              NOTE: THIS OPTION IS DEPRECATED

       --x509ecckeyfile
              This is an alias for the --x509keyfile option.

              NOTE: THIS OPTION IS DEPRECATED

       --x509ecccertfile
              This is an alias for the --x509certfile option.

              NOTE: THIS OPTION IS DEPRECATED

       --srppasswd=file
              SRP password file to use.

       --srppasswdconf=file
              SRP password configuration file to use.

       --pskpasswd=file
              PSK password file to use.

       --pskhint=string
              PSK identity hint to use.

       --ocsp-response=file
              The OCSP response to send to client.

              If the client requested an OCSP response, return data from
              this file to the client.

       -p number, --port=number
              The port to connect to.  This option takes an integer number
              as its argument.

       -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.

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

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

       -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         top

       Running your own TLS server based on GnuTLS can be useful when
       debugging clients and/or GnuTLS itself.  This section describes how
       to use gnutls-serv as a simple HTTPS server.

       The most basic server can be started as:

           gnutls-serv --http --priority "NORMAL:+ANON-ECDH:+ANON-DH"

       It will only support anonymous ciphersuites, which many TLS clients
       refuse to use.

       The next step is to add support for X.509.  First we generate a CA:

           $ certtool --generate-privkey > x509-ca-key.pem
           $ echo 'cn = GnuTLS test CA' > ca.tmpl
           $ echo 'ca' >> ca.tmpl
           $ echo 'cert_signing_key' >> ca.tmpl
           $ certtool --generate-self-signed --load-privkey x509-ca-key.pem   --template ca.tmpl --outfile x509-ca.pem

       Then generate a server certificate.  Remember to change the dns_name
       value to the name of your server host, or skip that command to avoid
       the field.

           $ certtool --generate-privkey > x509-server-key.pem
           $ echo 'organization = GnuTLS test server' > server.tmpl
           $ echo 'cn = test.gnutls.org' >> server.tmpl
           $ echo 'tls_www_server' >> server.tmpl
           $ echo 'encryption_key' >> server.tmpl
           $ echo 'signing_key' >> server.tmpl
           $ echo 'dns_name = test.gnutls.org' >> server.tmpl
           $ certtool --generate-certificate --load-privkey x509-server-key.pem   --load-ca-certificate x509-ca.pem --load-ca-privkey x509-ca-key.pem   --template server.tmpl --outfile x509-server.pem

       For use in the client, you may want to generate a client certificate
       as well.

           $ certtool --generate-privkey > x509-client-key.pem
           $ echo 'cn = GnuTLS test client' > client.tmpl
           $ echo 'tls_www_client' >> client.tmpl
           $ echo 'encryption_key' >> client.tmpl
           $ echo 'signing_key' >> client.tmpl
           $ certtool --generate-certificate --load-privkey x509-client-key.pem   --load-ca-certificate x509-ca.pem --load-ca-privkey x509-ca-key.pem   --template client.tmpl --outfile x509-client.pem

       To be able to import the client key/certificate into some
       applications, you will need to convert them into a PKCS#12 structure.
       This also encrypts the security sensitive key with a password.

           $ certtool --to-p12 --load-ca-certificate x509-ca.pem   --load-privkey x509-client-key.pem --load-certificate x509-client.pem   --outder --outfile x509-client.p12

       For icing, we'll create a proxy certificate for the client too.

           $ certtool --generate-privkey > x509-proxy-key.pem
           $ echo 'cn = GnuTLS test client proxy' > proxy.tmpl
           $ certtool --generate-proxy --load-privkey x509-proxy-key.pem   --load-ca-certificate x509-client.pem --load-ca-privkey x509-client-key.pem   --load-certificate x509-client.pem --template proxy.tmpl   --outfile x509-proxy.pem

       Then start the server again:

           $ gnutls-serv --http             --x509cafile x509-ca.pem             --x509keyfile x509-server-key.pem             --x509certfile x509-server.pem

       Try connecting to the server using your web browser.  Note that the
       server listens to port 5556 by default.

       While you are at it, to allow connections using ECDSA, you can also
       create a ECDSA key and certificate for the server.  These credentials
       will be used in the final example below.

           $ certtool --generate-privkey --ecdsa > x509-server-key-ecc.pem
           $ certtool --generate-certificate --load-privkey x509-server-key-ecc.pem   --load-ca-certificate x509-ca.pem --load-ca-privkey x509-ca-key.pem   --template server.tmpl --outfile x509-server-ecc.pem

       The next step is to add support for SRP authentication. This requires
       an SRP password file created with srptool.  To start the server with
       SRP support:

           gnutls-serv --http --priority NORMAL:+SRP-RSA:+SRP             --srppasswdconf srp-tpasswd.conf             --srppasswd srp-passwd.txt

       Let's also start a server with support for PSK. This would require a
       password file created with psktool.

           gnutls-serv --http --priority NORMAL:+ECDHE-PSK:+PSK             --pskpasswd psk-passwd.txt

       Finally, we start the server with all the earlier parameters and you
       get this command:

           gnutls-serv --http --priority NORMAL:+PSK:+SRP             --x509cafile x509-ca.pem             --x509keyfile x509-server-key.pem             --x509certfile x509-server.pem             --x509keyfile x509-server-key-ecc.pem             --x509certfile x509-server-ecc.pem             --srppasswdconf srp-tpasswd.conf             --srppasswd srp-passwd.txt             --pskpasswd psk-passwd.txt

EXIT STATUS         top

       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         top

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

AUTHORS         top

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

COPYRIGHT         top

       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         top

       Please send bug reports to: bugs@gnutls.org

NOTES         top

       This manual page was AutoGen-erated from the gnutls-serv option
       definitions.

COLOPHON         top

       This page is part of the GnuTLS (GnuTLS Transport Layer Security
       Library) project.  Information about the project can be found at 
       ⟨http://www.gnutls.org/⟩.  If you have a bug report for this manual
       page, send it to bugs@gnutls.org..  This page was obtained from the
       tarball gnutls-3.6.0.tar.xz fetched from 
       ⟨http://www.gnutls.org/download.html⟩ on 2017-09-15.  If you discover
       any rendering problems in this HTML version of the page, or you
       believe there is a better or more up-to-date source for the page, or
       you have corrections or improvements to the information in this
       COLOPHON (which is not part of the original manual page), send a mail
       to man-pages@man7.org

3.6.0                            21 Aug 2017                  gnutls-serv(1)