1 .\" Copyright (c) 2020 Omar Polo <op@omarpolo.com>
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14 .Dd $Mdocdate: October 2 2020$
19 .Nd dead simple zero configuration gemini server
35 is a simple and minimal gemini server that can serve static files and
37 It can run without a configuration file with a limited set of features
39 If a configuration file is given, no other flags shall be given,
44 fully supports IRIs (Internationalized Resource Identifiers, see
47 The options are as follows:
50 Specifies the configuration file.
52 Check that the configuration is valid, but don't start the server.
55 If no configuration file is given,
57 will look for the following option
62 The certificate to use.
64 The root directory to serve.
66 Stays and log in the foreground, do not daemonize the process.
68 Print the usage and exit.
70 The key for the certificate.
72 The port to listen on, by default 1965.
74 Enable execution of CGI scripts.
75 See the description of the
83 Cannot be provided more than once.
85 .Sh CONFIGURATION FILE
86 The configuration file is divided into two sections:
92 Virtual hosts definition
95 Within the sections, empty lines are ignored and comments can be put
96 anywhere in the file using a hash mark
98 and extend to the end of the current line.
99 A boolean is either the symbol
105 .It Ic daemon Ar bool
106 Enable or disables the daemon mode.
109 will log to syslog and fork in the background.
112 Enable or disable IPv6 support.
114 .It Ic port Ar portno
115 The port to listen on.
117 .It Ic protocols Ar string
118 Specify the TLS protocols to enable.
120 .Xr tls_config_parse_protocols 3
121 for the valid protocol string values.
122 By default, both TLSv1.3 and TLSv1.2 are used.
125 to enable only TLSv1.3.
126 .It Ic mime Ar mime-type Ar file-extension
127 Add a mapping for the given
131 Both argument are strings.
134 Every virtual host is defined by a
138 .It Ic server Ar hostname Brq ...
139 Match the server name using shell globbing rules. This can be an explicit name,
140 .Ar www.example.com ,
141 or a name including a wildcards,
145 Followed by a block of options that is enclosed in curly brackets:
148 Path to the certificate to use for this server.
151 should contain a PEM encoded certificate.
152 This option is mandatory.
154 Specify the private key to use for this server.
157 should contain a PEM encoded private key.
158 This option is mandatory.
159 .It Ic root Pa directory
160 Specify the root directory for this server.
161 This option is mandatory.
163 Enable the execution of CGI scripts if
165 is a prefix of the user request string.
166 An empty path "" will effectively enable the execution of any file
167 with the executable bit set inside the root directory.
168 .It Ic default type Ar string
169 Set the default media type that is used if the media type for a
170 specified extension is not found.
171 If not specified, the
174 .Dq application/octet-stream .
175 .It Ic lang Ar string
176 Specify the language tag for the text/gemini content served.
179 parameter will be added in the response.
182 When CGI scripts are enabled for a directory, a request for an
183 executable file will execute it and fed its output to the client.
185 The CGI scripts will inherit the environment from
187 with these additional variables set:
189 .It Ev SERVER_SOFTWARE
194 The (public) path to the script.
195 .It Ev SCRIPT_EXECUTABLE
196 The full path to the executable.
198 The user request (without the query parameters.)
199 .It Ev REQUEST_RELATIVE
200 The request relative to the script.
202 The query parameters.
204 The remote IP address.
206 The remote IP address.
208 The root directory being served, the one provided with the
212 or the root directory of the virtual host.
214 The string "Certificate" if the client used a certificate, otherwise unset.
216 The subject of the client certificate if provided, otherwise unset.
217 .It Ev TLS_CLIENT_ISSUER
218 The is the issuer of the client certificate if provided, otherwise unset.
219 .It Ev TLS_CLIENT_HASH
220 The hash of the client certificate if provided, otherwise unset.
221 The format is "ALGO:HASH".
224 Let's say you have a script in
226 and the user request is
227 .Pa /cgi-bin/script/foo/bar?quux .
232 .Ev SCRIPT_EXECUTABLE
234 .Pa $DOCUMENT_ROOT/cgi-bin/script ,
237 .Pa cgi-bin/script/foo/bar ,
246 To quickly getting started
247 .Bd -literal -offset indent
248 $ # generate a cert and a key
249 $ openssl req -x509 -newkey rsa:4096 -keyout key.pem \\
250 -out cert.pem -days 365 -nodes
252 $ cat <<EOF > docs/index.gmi
256 $ gmid -C cert.pem -K key.pem -d docs
259 Now you can visit gemini://localhost/ with your preferred gemini
262 To add some CGI scripts, assuming a setup similar to the previous
264 .Bd -literal -offset indent
266 $ cat <<EOF > docs/cgi-bin/hello-world
268 printf "20 text/plain\\r\\n"
271 $ gmid -C cert.pem -K key.pem -d docs -x cgi-bin
274 Note that the argument to the
280 since it's relative to the document root.
282 The following is an example of a possible configuration for a site
283 that enables only TLSv1.3, adds a mime type for the file extension
284 "rtf" and defines two virtual host:
285 .Bd -literal -offset indent
286 ipv6 on # enable ipv6
287 daemon on # enable daemon mode
291 mime "application/rtf" "rtf"
293 server "example.com" {
294 cert "/path/to/cert.pem"
295 key "/path/to/key.pem"
296 root "/var/gemini/example.com"
299 server "it.example.com" {
300 cert "/path/to/cert.pem"
301 key "/path/to/key.pem"
302 root "/var/gemini/it.example.com"
310 .Dq Flexible and Economical
311 UTF-8 decoder written by
317 The root directories of all virtual hosts are opened during the daemon
318 startup; this means that if a root directory gets deleted and then
321 won't be able to serve files inside that directory until a restart.
322 This restriction applies only to the root directories and not their content.
324 a %2F sequence in the path part is indistinguishable from a literal
325 slash: this is not RFC3986-compliant.
327 a %00 sequence either in the path or in the query part is treated as
328 invalid character and thus rejected.