AutoGen Definitions options;

prog-name     = gnutls-serv;

prog-title    = "GnuTLS server";

prog-desc     = "Simple server program to act as an HTTPS or TLS echo service.";

short-usage   = "Usage: gnutls-serv [options]\ngnutls-serv --help for usage instructions.\n";

explain       = "";

detail        = "Server program that listens to incoming TLS connections.";

#include args-std.def

flag = {

    name      = sni-hostname;

    descrip   = "Server's hostname for server name extension";

    arg-type  = string;

    doc      = "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.";

};

flag = {

    name      = sni-hostname-fatal;

    descrip   = "Send fatal alert on sni-hostname mismatch";

    doc      = "";

};

flag = {

    name      = alpn;

    arg-type  = string;

    descrip   = "Specify ALPN protocol to be enabled by the server";

    doc      = "Specify the (textual) ALPN protocol for the server to use.";

    stack-arg;

    max       = NOLIMIT;

};

flag = {

    name      = alpn-fatal;

    descrip   = "Send fatal alert on non-matching ALPN name";

    doc      = "";

};

flag = {

    name      = noticket;

    descrip   = "Don't accept session tickets";

    doc      = "";

};

flag = {

    name      = generate;

    value     = g;

    descrip   = "Generate Diffie-Hellman parameters";

    doc      = "";

};

flag = {

    name      = quiet;

    value     = q;

    descrip   = "Suppress some messages";

    doc      = "";

};

flag = {

    name      = nodb;

    descrip   = "Do not use a resumption database";

    doc      = "";

};

flag = {

    name      = http;

    descrip   = "Act as an HTTP server";

    doc      = "";

};

flag = {

    name      = echo;

    descrip   = "Act as an Echo server";

    doc      = "";

};

flag = {

    name      = udp;

    value     = u;

    descrip   = "Use DTLS (datagram TLS) over UDP";

    doc      = "";

};

flag = {

    name      = mtu;

    arg-type  = number;

    arg-range = "0->17000";

    descrip   = "Set MTU for datagram TLS";

    doc      = "";

};

flag = {

    name      = srtp_profiles;

    arg-type  = string;

    descrip   = "Offer SRTP profiles";

    doc       = "";

};

flag = {

    name      = disable-client-cert;

    value     = a;

    descrip   = "Do not request a client certificate";

    doc      = "";

};

flag = {

    name      = require-client-cert;

    value     = r;

    descrip   = "Require a client certificate";

    doc      = "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.";

};

flag = {

    name      = verify-client-cert;

    disabled;

    descrip   = "If a client certificate is sent then verify it.";

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

};

flag = {

    name      = heartbeat;

    value     = b;

    descrip   = "Activate heartbeat support";

    doc      = "Regularly ping client via heartbeat extension messages";

};

flag = {

    name      = x509fmtder;

    descrip   = "Use DER format for certificates to read from";

    doc      = "";

};

flag = {

    name      = priority;

    arg-type  = string;

    descrip   = "Priorities string";

    doc      = "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";

};

flag = {

    name      = dhparams;

    arg-type  = file;

    file-exists = yes;

    descrip   = "DH params file to use";

    doc      = "";

};

flag = {

    name      = x509cafile;

    arg-type  = string;

    descrip   = "Certificate file or PKCS #11 URL to use";

    doc      = "";

};

flag = {

    name      = x509crlfile;

    arg-type  = file;

    file-exists = yes;

    descrip   = "CRL file to use";

    doc      = "";

};

flag = {

    name      = pgpkeyfile;

    arg-type  = file;

    file-exists = yes;

    descrip   = "PGP Key file to use";

    doc      = "";

    deprecated;

};

flag = {

    name      = x509keyfile;

    arg-type  = string;

    descrip   = "X.509 key file or PKCS #11 URL to use";

    doc      = "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 occurrence of keyfile

must be followed by the corresponding x509certfile or vice-versa.";

    stack-arg;

    max       = NOLIMIT;

};

flag = {

    name      = x509certfile;

    arg-type  = string;

    descrip   = "X.509 Certificate file or PKCS #11 URL to use";

    doc      = "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 occurrence of keyfile

must be followed by the corresponding x509certfile or vice-versa.";

    stack-arg;

    max       = NOLIMIT;

};

flag = {

    name      = x509dsakeyfile;

    aliases   = x509keyfile;

    descrip   = "Alternative X.509 key file or PKCS #11 URL to use";

    deprecated;

};

flag = {

    name      = x509dsacertfile;

    aliases   = x509certfile;

    descrip   = "Alternative X.509 Certificate file or PKCS #11 URL to use";

    deprecated;

};

flag = {

    name      = x509ecckeyfile;

    aliases   = x509keyfile;

    descrip   = "Alternative X.509 key file or PKCS #11 URL to use";

    deprecated;

};

flag = {

    name      = x509ecccertfile;

    aliases   = x509certfile;

    descrip   = "Alternative X.509 Certificate file or PKCS #11 URL to use";

    deprecated;

};

flag = {

    name      = srppasswd;

    arg-type  = file;

    file-exists = yes;

    descrip   = "SRP password file to use";

    doc      = "";

};

flag = {

    name      = srppasswdconf;

    arg-type  = file;

    file-exists = yes;

    descrip   = "SRP password configuration file to use";

    doc      = "";

};

flag = {

    name      = pskpasswd;

    arg-type  = file;

    file-exists = yes;

    descrip   = "PSK password file to use";

    doc      = "";

};

flag = {

    name      = pskhint;

    arg-type  = string;

    descrip   = "PSK identity hint to use";

    doc      = "";

};

flag = {

    name      = ocsp-response;

    arg-type  = file;

    file-exists = yes;

    descrip   = "The OCSP response to send to client";

    doc      = "If the client requested an OCSP response, return data from this file to the client.";

};

flag = {

    name      = port;

    value     = p;

    arg-type  = number;

    descrip   = "The port to connect to";

    doc      = "";

};

flag = {

    name      = list;

    value     = l;

    descrip   = "Print a list of the supported algorithms and modes";

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

};

flag = {

    name      = provider;

    arg-type  = file;

    file-exists = yes;

    descrip   = "Specify the PKCS #11 provider library";

    doc      = "This will override the default options in /etc/gnutls/pkcs11.conf";

};

doc-section = {

  ds-type   = 'SEE ALSO'; // or anything else

  ds-format = 'texi';      // or texi or mdoc format

  ds-text   = <<-_EOText_

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

_EOText_;

};

doc-section = {

  ds-type = 'EXAMPLES';

  ds-format = 'texi';

  ds-text   = <<-_EOF_

Running your own TLS server based on GnuTLS can be useful when

debugging clients and/or GnuTLS itself.  This section describes how to

use @code{gnutls-serv} as a simple HTTPS server.

The most basic server can be started as:

@example

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

@end example

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:

@example

$ 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

@end example

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.

@example

$ 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

@end example

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

as well.

@example

$ 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

@end example

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.

@example

$ 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

@end example

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

@example

$ 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

@end example

Then start the server again:

@example

$ gnutls-serv --http \

            --x509cafile x509-ca.pem \

            --x509keyfile x509-server-key.pem \

            --x509certfile x509-server.pem

@end example

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.

@example

$ 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

@end example

The next step is to add support for SRP authentication. This requires

an SRP password file created with @code{srptool}.

To start the server with SRP support:

@example

gnutls-serv --http --priority NORMAL:+SRP-RSA:+SRP \

            --srppasswdconf srp-tpasswd.conf \

            --srppasswd srp-passwd.txt

@end example

Let's also start a server with support for PSK. This would require

a password file created with @code{psktool}.

@example

gnutls-serv --http --priority NORMAL:+ECDHE-PSK:+PSK \

            --pskpasswd psk-passwd.txt

@end example

Finally, we start the server with all the earlier parameters and you

get this command:

@example

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

@end example

_EOF_;

};