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      = noticket;
    descrip   = "Don't accept session tickets";
    doc      = "";
};

flag = {
    name      = generate;
    value     = g;
    descrip   = "Generate Diffie-Hellman and RSA-export 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      = "";
};

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.

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      = "";
};

flag = {
    name      = pgpkeyring;
    arg-type  = file;
    file-exists = yes;
    descrip   = "PGP Key ring file to use";
    doc      = "";
};

flag = {
    name      = pgpcertfile;
    arg-type  = file;
    file-exists = yes;
    descrip   = "PGP Public Key (certificate) file to use";
    doc      = "";
};

flag = {
    name      = x509keyfile;
    arg-type  = string;
    descrip   = "X.509 key file or PKCS #11 URL to use";
    doc      = "";
};

flag = {
    name      = x509certfile;
    arg-type  = string;
    descrip   = "X.509 Certificate file or PKCS #11 URL to use";
    doc      = "";
};

flag = {
    name      = x509dsakeyfile;
    arg-type  = string;
    descrip   = "Alternative X.509 key file or PKCS #11 URL to use";
    doc      = "";
};

flag = {
    name      = x509dsacertfile;
    arg-type  = string;
    descrip   = "Alternative X.509 Certificate file or PKCS #11 URL to use";
    doc      = "";
};

flag = {
    name      = x509ecckeyfile;
    arg-type  = string;
    descrip   = "Alternative X.509 key file or PKCS #11 URL to use";
    doc      = "";
};

flag = {
    name      = x509ecccertfile;
    arg-type  = string;
    descrip   = "Alternative X.509 Certificate file or PKCS #11 URL to use";
    doc      = "";
};

flag = {
    name      = pgpsubkey;
    arg-type  = string;
    descrip   = "PGP subkey to use (hex or auto)";
    doc      = "";
};

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.";
};

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
@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 DSA, you can also
create a DSA key and certificate for the server.  These credentials
will be used in the final example below.

@example
$ certtool --generate-privkey --dsa > x509-server-key-dsa.pem
$ certtool --generate-certificate --load-privkey x509-server-key-dsa.pem \
  --load-ca-certificate x509-ca.pem --load-ca-privkey x509-ca-key.pem \
  --template server.tmpl --outfile x509-server-dsa.pem
...
@end example

The next step is to create OpenPGP credentials for the server.

@example
gpg --gen-key
...enter whatever details you want, use 'test.gnutls.org' as name...
@end example

Make a note of the OpenPGP key identifier of the newly generated key,
here it was @code{5D1D14D8}.  You will need to export the key for
GnuTLS to be able to use it.

@example
gpg -a --export 5D1D14D8 > openpgp-server.txt
gpg --export 5D1D14D8 > openpgp-server.bin
gpg --export-secret-keys 5D1D14D8 > openpgp-server-key.bin
gpg -a --export-secret-keys 5D1D14D8 > openpgp-server-key.txt
@end example

Let's start the server with support for OpenPGP credentials:

@example
gnutls-serv --http \
            --pgpkeyfile openpgp-server-key.txt \
            --pgpcertfile openpgp-server.txt
@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 \
            --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 \
            --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 \
            --x509cafile x509-ca.pem \
            --x509keyfile x509-server-key.pem \
            --x509certfile x509-server.pem \
            --x509dsakeyfile x509-server-key-dsa.pem \
            --x509dsacertfile x509-server-dsa.pem \
            --pgpkeyfile openpgp-server-key.txt \
            --pgpcertfile openpgp-server.txt \
            --srppasswdconf srp-tpasswd.conf \
            --srppasswd srp-passwd.txt \
            --pskpasswd psk-passwd.txt
@end example
_EOF_;
};