NAME¶
gnutls-serv - GnuTLS server
SYNOPSIS¶
gnutls-serv [
-flags] [
-flag [
value]] [
--option-name[[=| ]
value]]
All arguments must be options.
DESCRIPTION¶
Server program that listens to incoming TLS connections.
OPTIONS¶
- -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.
- --noticket
-
Don't accept session tickets.
- -g, --generate
-
Generate Diffie-Hellman and RSA-export 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.
- --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.
- --pgpkeyring=file
-
PGP Key ring file to use.
- --pgpcertfile=file
-
PGP Public Key (certificate) file to use.
- --x509keyfile=string
-
X.509 key file or PKCS #11 URL to use.
- --x509certfile=string
-
X.509 Certificate file or PKCS #11 URL to use.
- --x509dsakeyfile=string
-
Alternative X.509 key file or PKCS #11 URL to use.
- --x509dsacertfile=string
-
Alternative X.509 Certificate file or PKCS #11 URL to use.
- --x509ecckeyfile=string
-
Alternative X.509 key file or PKCS #11 URL to use.
- --x509ecccertfile=string
-
Alternative X.509 Certificate file or PKCS #11 URL to use.
- --pgpsubkey=string
-
PGP subkey to use (hex or auto).
- --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.
- -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¶
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 DSA, you can also create a DSA
key and certificate for the server. These credentials will be used in the
final example below.
$ 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
The next step is to create OpenPGP credentials for the server.
gpg --gen-key
Make a note of the OpenPGP key identifier of the newly generated key, here it
was
5D1D14D8. You will need to export the key for GnuTLS to be able to
use it.
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
Let's start the server with support for OpenPGP credentials:
gnutls-serv --http --priority NORMAL:+CTYPE-OPENPGP --pgpkeyfile openpgp-server-key.txt --pgpcertfile openpgp-server.txt
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:+CTYPE-OPENPGP --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
EXIT STATUS¶
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¶
gnutls-cli-debug(1),
gnutls-cli(1)
AUTHORS¶
Nikos Mavrogiannopoulos, Simon Josefsson and others; see
/usr/share/doc/gnutls/AUTHORS for a complete list.
COPYRIGHT¶
Copyright (C) 2000-2014 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¶
Please send bug reports to: bugs@gnutls.org
NOTES¶
This manual page was
AutoGen-erated from the
gnutls-serv option
definitions.