1gnutls-serv(1) User Commands gnutls-serv(1)
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6 gnutls-serv - GnuTLS server
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9 gnutls-serv [-flags] [-flag [value]] [--option-name[[=| ]value]]
10 All arguments must be options.
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15 Server program that listens to incoming TLS connections.
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18 -d number, --debug=number
19 Enable debugging. This option takes an integer number as its
20 argument. The value of number is constrained to being:
21 in the range 0 through 9999
22 Specifies the debug level.
24 --sni-hostname=string
26 Server's hostname for server name extension.
27 Server name of type host_name that the server will recognise as
29 its own. If the server receives client hello with different
30 name, it will send a warning-level unrecognized_name alert.
31 --sni-hostname-fatal
33 Send fatal alert on sni-hostname mismatch.
34 --alpn=string
37 Specify ALPN protocol to be enabled by the server. This option
38 may appear an unlimited number of times.
39 Specify the (textual) ALPN protocol for the server to use.
41 --alpn-fatal
43 Send fatal alert on non-matching ALPN name.
44 --noticket
47 Don't accept session tickets.
48 --earlydata
51 Accept early data.
52 --maxearlydata=number
55 The maximum early data size to accept. This option takes an
56 integer number as its argument. The value of number is con‐
57 strained to being:
58 in the range 1 through 4294967295
59 --nocookie
62 Don't require cookie on DTLS sessions.
63 -g, --generate
66 Generate Diffie-Hellman parameters.
67 -q, --quiet
70 Suppress some messages.
71 --nodb Do not use a resumption database.
74 --http Act as an HTTP server.
77 --echo Act as an Echo server.
80 -u, --udp
83 Use DTLS (datagram TLS) over UDP.
84 --mtu=number
87 Set MTU for datagram TLS. This option takes an integer number
88 as its argument. The value of number is constrained to being:
89 in the range 0 through 17000
90 --srtp-profiles=string
93 Offer SRTP profiles.
94 -a, --disable-client-cert
97 Do not request a client certificate. This option must not
98 appear in combination with any of the following options:
99 require-client-cert.
100 -r, --require-client-cert
103 Require a client certificate.
104 This option before 3.6.0 used to imply --verify-client-cert.
106 Since 3.6.0 it will no longer verify the certificate by default.
107 --verify-client-cert
109 If a client certificate is sent then verify it..
110 Do not require, but if a client certificate is sent then verify
112 it and close the connection if invalid.
113 -b, --heartbeat
115 Activate heartbeat support.
116 Regularly ping client via heartbeat extension messages
118 --x509fmtder
120 Use DER format for certificates to read from.
121 --priority=string
124 Priorities string.
125 TLS algorithms and protocols to enable. You can use predefined
127 sets of ciphersuites such as PERFORMANCE, NORMAL, SECURE128,
128 SECURE256. The default is NORMAL.
129 Check the GnuTLS manual on section “Priority strings” for
131 more information on allowed keywords
132 --dhparams=file
134 DH params file to use.
135 --x509cafile=string
138 Certificate file or PKCS #11 URL to use.
139 --x509crlfile=file
142 CRL file to use.
143 --pgpkeyfile=file
146 PGP Key file to use.
147 NOTE: THIS OPTION IS DEPRECATED
150 --x509keyfile=string
152 X.509 key file or PKCS #11 URL to use. This option may appear
153 an unlimited number of times.
154 Specify the private key file or URI to use; it must correspond
156 to the certificate specified in --x509certfile. Multiple keys
157 and certificates can be specified with this option and in that
158 case each occurrence of keyfile must be followed by the corre‐
159 sponding x509certfile or vice-versa.
160 --x509certfile=string
162 X.509 Certificate file or PKCS #11 URL to use. This option may
163 appear an unlimited number of times.
164 Specify the certificate file or URI to use; it must correspond
166 to the key specified in --x509keyfile. Multiple keys and cer‐
167 tificates can be specified with this option and in that case
168 each occurrence of keyfile must be followed by the corresponding
169 x509certfile or vice-versa.
170 --x509dsakeyfile
172 This is an alias for the --x509keyfile option.
173 NOTE: THIS OPTION IS DEPRECATED
175 --x509dsacertfile
177 This is an alias for the --x509certfile option.
178 NOTE: THIS OPTION IS DEPRECATED
180 --x509ecckeyfile
182 This is an alias for the --x509keyfile option.
183 NOTE: THIS OPTION IS DEPRECATED
185 --x509ecccertfile
187 This is an alias for the --x509certfile option.
188 NOTE: THIS OPTION IS DEPRECATED
190 --srppasswd=file
192 SRP password file to use.
193 --srppasswdconf=file
196 SRP password configuration file to use.
197 --pskpasswd=file
200 PSK password file to use.
201 --pskhint=string
204 PSK identity hint to use.
205 --ocsp-response=string
208 The OCSP response to send to client. This option may appear an
209 unlimited number of times.
210 If the client requested an OCSP response, return data from this
212 file to the client.
213 --ignore-ocsp-response-errors
215 Ignore any errors when setting the OCSP response.
216 That option instructs gnutls to not attempt to match the pro‐
218 vided OCSP responses with the certificates.
219 -p number, --port=number
221 The port to connect to. This option takes an integer number as
222 its argument.
223 -l, --list
226 Print a list of the supported algorithms and modes.
227 Print a list of the supported algorithms and modes. If a prior‐
229 ity string is given then only the enabled ciphersuites are
230 shown.
231 --provider=file
233 Specify the PKCS #11 provider library.
234 This will override the default options in
236 /etc/gnutls/pkcs11.conf
237 --keymatexport=string
239 Label used for exporting keying material.
240 --keymatexportsize=number
243 Size of the exported keying material. This option takes an
244 integer number as its argument.
245 -h, --help
248 Display usage information and exit.
249 -!, --more-help
251 Pass the extended usage information through a pager.
252 -v [{v|c|n --version [{v|c|n}]}]
254 Output version of program and exit. The default mode is `v', a
255 simple version. The `c' mode will print copyright information
256 and `n' will print the full copyright notice.
257
259 Running your own TLS server based on GnuTLS can be useful when debug‐
260 ging clients and/or GnuTLS itself. This section describes how to use
261 gnutls-serv as a simple HTTPS server.
262 The most basic server can be started as:
264 gnutls-serv --http --priority "NORMAL:+ANON-ECDH:+ANON-DH"
266 It will only support anonymous ciphersuites, which many TLS clients
268 refuse to use.
269 The next step is to add support for X.509. First we generate a CA:
271 $ certtool --generate-privkey > x509-ca-key.pem
273 $ echo 'cn = GnuTLS test CA' > ca.tmpl
274 $ echo 'ca' >> ca.tmpl
275 $ echo 'cert_signing_key' >> ca.tmpl
276 $ certtool --generate-self-signed --load-privkey x509-ca-key.pem --template ca.tmpl --outfile x509-ca.pem
277 Then generate a server certificate. Remember to change the dns_name
279 value to the name of your server host, or skip that command to avoid
280 the field.
281 $ certtool --generate-privkey > x509-server-key.pem
283 $ echo 'organization = GnuTLS test server' > server.tmpl
284 $ echo 'cn = test.gnutls.org' >> server.tmpl
285 $ echo 'tls_www_server' >> server.tmpl
286 $ echo 'encryption_key' >> server.tmpl
287 $ echo 'signing_key' >> server.tmpl
288 $ echo 'dns_name = test.gnutls.org' >> server.tmpl
289 $ 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
290 For use in the client, you may want to generate a client certificate as
292 well.
293 $ certtool --generate-privkey > x509-client-key.pem
295 $ echo 'cn = GnuTLS test client' > client.tmpl
296 $ echo 'tls_www_client' >> client.tmpl
297 $ echo 'encryption_key' >> client.tmpl
298 $ echo 'signing_key' >> client.tmpl
299 $ 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
300 To be able to import the client key/certificate into some applications,
302 you will need to convert them into a PKCS#12 structure. This also
303 encrypts the security sensitive key with a password.
304 $ 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
306 For icing, we'll create a proxy certificate for the client too.
308 $ certtool --generate-privkey > x509-proxy-key.pem
310 $ echo 'cn = GnuTLS test client proxy' > proxy.tmpl
311 $ 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
312 Then start the server again:
314 $ gnutls-serv --http --x509cafile x509-ca.pem --x509keyfile x509-server-key.pem --x509certfile x509-server.pem
316 Try connecting to the server using your web browser. Note that the
318 server listens to port 5556 by default.
319 While you are at it, to allow connections using ECDSA, you can also
321 create a ECDSA key and certificate for the server. These credentials
322 will be used in the final example below.
323 $ certtool --generate-privkey --ecdsa > x509-server-key-ecc.pem
325 $ 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
326 The next step is to add support for SRP authentication. This requires
329 an SRP password file created with srptool. To start the server with
330 SRP support:
331 gnutls-serv --http --priority NORMAL:+SRP-RSA:+SRP --srppasswdconf srp-tpasswd.conf --srppasswd srp-passwd.txt
333 Let's also start a server with support for PSK. This would require a
335 password file created with psktool.
336 gnutls-serv --http --priority NORMAL:+ECDHE-PSK:+PSK --pskpasswd psk-passwd.txt
338 Finally, we start the server with all the earlier parameters and you
340 get this command:
341 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
343
345 One of the following exit values will be returned:
346 0 (EXIT_SUCCESS)
348 Successful program execution.
349 1 (EXIT_FAILURE)
351 The operation failed or the command syntax was not valid.
352 70 (EX_SOFTWARE)
354 libopts had an internal operational error. Please report it to
355 autogen-users@lists.sourceforge.net. Thank you.
356
358 gnutls-cli-debug(1), gnutls-cli(1)
359
361 Nikos Mavrogiannopoulos, Simon Josefsson and others; see
362 /usr/share/doc/gnutls/AUTHORS for a complete list.
363
365 Copyright (C) 2000-2019 Free Software Foundation, and others all rights
366 reserved. This program is released under the terms of the GNU General
367 Public License, version 3 or later.
368
370 Please send bug reports to: bugs@gnutls.org
371
373 This manual page was AutoGen-erated from the gnutls-serv option defini‐
374 tions.
3753.6.8 25 May 2019 gnutls-serv(1)