You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
 
Omar Polo 97b306cbee add an implicit fastcgi parameter: GEMINI_SEARCH_STRING 1 day ago
compat add memmem compat 4 weeks ago
contrib rework `make dist' 4 weeks ago
have add memmem compat 4 weeks ago
regress disable test_unknown_host temporarly 4 weeks ago
site fix git url 4 weeks ago
.cirrus.yml add .cirrus.yml 1 year ago
.dockerignore fix the dockerfile 1 year ago
.gitignore add ge: gemini export! 3 months ago
ChangeLog sync 3 months ago
LICENSE copyright years 5 months ago
Makefile rework `make dist' 4 weeks ago
Makefile.depend update depends 3 months ago
README.md get rid of the CGI support 3 months ago
configure bump version ahead of 1.8 branch 4 weeks ago
configure.local.example add an example configure.local based on mandoc-portable' one 5 months ago
dirs.c don't set d_reclen 5 months ago
fcgi.c add an implicit fastcgi parameter: GEMINI_SEARCH_STRING 1 day ago
ge.1 add ge: gemini export! 3 months ago
ge.c make the various strings in the config fixed-length 2 months ago
gg.1 remove -v from gg 4 weeks ago
gg.c always cast is*() arguments to unsigned char 2 weeks ago
gmid.8 change the flags to be consistent with other OpenBSD daemons 3 months ago
gmid.c when switching user also set the groups 1 day ago
gmid.conf.5 add an implicit fastcgi parameter: GEMINI_SEARCH_STRING 1 day ago
gmid.h make the various strings in the config fixed-length 2 months ago
iri.c add an implicit fastcgi parameter: GEMINI_SEARCH_STRING 1 day ago
landlock_shim.h tweak landlock comment 1 year ago
log.c call tzset(3) to fix times in logs 5 months ago
mime.c retire the deprecated `mime' and `map' config options 3 months ago
parse.y don't crash when specifying fcgi UNIX sockets to connect to 1 day ago
proxy.c always cast is*() arguments to unsigned char 2 weeks ago
puny.c fix various compilation errors 2 years ago
sandbox.c adjust pledge/unveil on OpenBSD 1 day ago
server.c typo 1 day ago
utf8.c fmt 1 year ago
utils.c log when the certificate was successfully generated 8 months ago

README.md

gmid

gmid is a fast Gemini server written with security in mind. I initially wrote it to serve static files, but it has grown into a featureful server.

Features

(random order)

  • sandboxed by default on OpenBSD, Linux and FreeBSD
  • reconfiguration: reload the running configuration without interruption
  • automatic redirect/error pages (see block return)
  • IRI support (RFC3987)
  • automatic certificate generation for config-less mode
  • reverse proxying
  • FastCGI support
  • virtual hosts
  • location rules
  • event-based asynchronous I/O model
  • low memory footprint
  • small codebase, easily hackable

Internationalisation (IRIs, UNICODE, punycode, all that stuff)

Even thought the current Gemini specification doesn't mention anything in this regard, I do think these are important things and so I tried to implement them in the most user-friendly way I could think of.

For starters, gmid has full support for IRI (RFC3987 — Internationalized Resource Identifiers). IRIs are a superset of URIs, so there aren't incompatibilities with URI-only clients.

There is full support also for punycode. In theory, the user doesn't even need to know that punycode is a thing. The hostname in the configuration file can (and must be) in the decoded form (e.g. naïve and not xn--nave-6pa), gmid will do the rest.

The only missing piece is UNICODE normalisation of the IRI path: gmid doesn't do that (yet).

Configuration

gmid has a rich configuration file, heavily inspired by OpenBSD' httpd, with every detail carefully documented in the manpage. Here's a minimal example of a config file:

server "example.com" {
	cert "/path/to/cert.pem"
	key  "/path/to/key.pem"
	root "/var/gemini/example.com"
}

and a slightly more complex one

ipv6 on     # enable ipv6

# define a macro
cert_root = "/path/to/keys"

server "example.com" {
	alias "foobar.com"

	cert $cert_root "/example.com.crt"
	key  $cert_root "/example.com.pem"
	root "/var/gemini/example.com"

	# lang for text/gemini files
	lang "en"

	# only for locations that matches /files/*
	location "/files/*" {
		# generate directory listings
		auto index on
	}

	location "/repo/*" {
		# change the index file name
		index "README.gmi"
		lang "it"
	}
}

Building

gmid depends on libevent2, OpenSSL/LibreSSL and libtls (provided either by LibreSSL or libretls). At build time, yacc (or GNU bison) is also needed.

The build is as simple as

./configure
make

or make static to build a statically-linked executable.

If the configure scripts fails to pick up something, please open an issue or notify me via email.

To install execute:

make install

Please keep in mind that the master branch, from time to time, may be accidentally broken on some platforms. gmid is developed primarily on OpenBSD/amd64 and commits on the master branch don't get always tested in other OSes. Before tagging a release however, a comprehensive testing on various platform is done to ensure that everything is working as intended.

Testing

Execute

make regress

to start the suite. Keep in mind that the regression tests needs to create files inside the regress directory and bind the 10965 port.

Contributing

Any form of contribution is welcome, not only patches or bug reports. If you have a sample configuration for some specific use-case, a script or anything that could be useful to others, consider adding it to the contrib directory.

Architecture/Security considerations

outdated: revisit for gmid 2.0

gmid is composed by four processes: the parent process, the logger, the listener and the executor. The parent process is the only one that doesn't drop privileges, but all it does is to wait for a SIGHUP to reload the configuration and spawn a new generation of children process. The logger process gathers the logs and prints 'em to stderr or syslog (for the time being.) The listener process is the only one that needs internet access and is sandboxed by default. The executor process exists only to fork and execute CGI scripts, and optionally to connect to FastCGI applications.

On OpenBSD the processes are all pledge(2)d and unveil(2)ed.

On FreeBSD, the listener and logger process are sandboxed with capsicum(4).

On Linux, a seccomp(2) filter is installed in the listener to allow only certain syscalls, see sandbox.c for more information about the BPF program. If available, landlock is used to limit the portion of the file system gmid can access (requires linux 5.13+.)

In any case, it's advisable to run gmid inside some sort of container/jail/chroot.