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BOZOHTTPD(8) System Manager's Manual BOZOHTTPD(8)
NAME
bozohttpd - hyper text transfer protocol version 1.1 daemon
SYNOPSIS
bozohttpd [-EGHVXdefhnqsu] [-C suffix cgihandler] [-I port]
[-L prefix script] [-M suffix type encoding encoding11]
[-m version] [-P pidfile] [-R readme] [-S version]
[-T type timeout] [-U username] [-Z cert privkey] [-c cgibin]
[-i address] [-p pubdir] [-t chrootdir] [-v virtualroot]
[-x index] [-z ciphers] slashdir [myname]
DESCRIPTION
The bozohttpd program reads a HTTP request from the standard input, and
sends a reply to the standard output. Besides ~user translation and
virtual hosting support (see below), all file requests are from slashdir
directory. The server uses myname as its name, which defaults to the
local hostname, obtained from gethostname(3) (but see the -v option for
virtual hosting.) bozohttpd writes logs to syslog(3) using the ftp
facility (but see the -s option for testing and the -q option for
suppressing this.) bozohttpd is designed to be small, simple and
relatively featureless, hopefully increasing its security.
OPTIONS
The following options are available:
-b Enables stand-alone daemon mode, where bozohttpd detaches from
the current terminal and runs in the background (unless
invoked with -f), listens on the appropriate IP address (see
-i address) and TCP port (see -I port), and services HTTP
requests. bozohttpd does not use inetd(8) in stand-alone
daemon mode.
-C suffix cgihandler
Adds a new CGI handler program for a particular file type.
The suffix should be any normal file suffix, and the
cgihandler should be a full path to an interpreter. This
option is the only way to enable CGI programs that exist
outside of the cgibin directory to be executed. Multiple -C
options may be passed.
-c cgibin Enables the CGI/1.1 interface. The cgibin directory is
expected to contain the CGI programs to be used. bozohttpd
looks for URLs in the form of `/cgi-bin/scriptname' where
scriptname is a valid CGI program in the cgibin directory. In
other words, all CGI URLs must begin with `/cgi-bin/'. Note
that the CGI/1.1 interface is available with `~user'
translation using -E switch.
-d Enables debug support.
-E Enables CGI/1.1 interface for `~user' translation. Note that
enabling this support implies that users can run commands as
the web server user. This may have security implications.
-e Do not clear the environment when used with either the -t or
-U options.
-f Stops the -b option from detaching bozohttpd from the tty and
going into the background as part of stand-alone daemon mode.
This implies the -b option.
-G Get the bozohttpd version string, print it on standard output,
and exit.
-H Changes directory index mode (see -X option) to hide files and
directories that start with a period (`.'), except for ...
-I port Use port instead of the default "http" port (usually 80, see
services(5)). When used with the -b or -f options, this
option changes the bound port. Otherwise this option forces
redirections to use this port instead of the value obtained
via getsockname(2).
-i address
Use address as the address to bind to in stand-alone daemon
mode. If this option is not provided, all available IP
addresses will be listened to. Only the last -i option is
used. This option is only valid with the -b or -f options.
-L prefix script
Adds a new Lua script for a particular prefix. The prefix
should be an arbitrary text, and the script should be a full
path to a Lua script. Multiple -L options may be passed. A
separate Lua state is created for each prefix. The Lua script
can register callbacks using the
httpd.register_handler('suffixpath', luafunc)
Lua function, which will trigger the execution of the Lua
function luafunc() when a URL in the form
http://hostname/prefix/suffixpath is being accessed. The
function is passed three tables as arguments, the server
environment, the request headers, and the decoded query string
plus any data that was sent as application/x-www-form-
urlencoded.
-M suffix type encoding encoding11
Adds a new entry to the table that converts file suffixes to
content type and encoding. This option takes four additional
arguments containing the file prefix, its "Content-Type",
"Content-Encoding", and "Content-Encoding" for HTTP/1.1
connections, respectively. If any of these are a single dash
("-"), the empty string is used instead. Multiple -M options
may be passed.
-m version
Set the minimum supported SSL protocol version. The valid
values of version are "TLSv1.1", "TLSv1.2", and "TLSv1.3".
The default version is "TLSv1.1".
-n Stops bozohttpd from doing IP address to name resolution of
remote hosts. This affects the REMOTE_HOST environment
variable for CGI programs and Lua scripts.
-P pidfile
Create a PID file in pidfile when run in daemon mode with the
-b or -f options.
-p pubdir Changes the default user directory for `/~user/' translations
from public_html to pubdir.
-q Quiet mode - no log entries generated.
-R readme When directory indexing is enabled (see -X option), include
the contents of the file readme in the footer of the directory
index.
-S version
Sets the internal server version to version.
-s Forces logging to be set to stderr always.
-T type timeout
Set the timeout for type to timeout. The valid values of type
are "ssl timeout", "initial timeout", "header timeout", and
"request timeout". The default values are 30 seconds, 30
seconds, 10 seconds and 600 seconds, respectively.
-t chrootdir
Makes bozohttpd chroot to the specified directory before
answering requests. Every other path should be specified
relative to the new root, if this option is used. Note that
the current environment is normally replaced with an empty
environment with this option, unless the -e option is also
used.
-U username
Switch to the user and the groups of username after
initialization. This option, like -t above, causes bozohttpd
to clear the environment unless the -e option is given.
-u Enables the transformation of Uniform Resource Locators of the
form `/~user/' into the directory ~user/public_html (but see
the -p option above).
-V Sets the backup virtual host directory to the slashdir
argument. If no directory exists in virtualroot for the
request, then slashdir will be used. The default behavior is
to return 404 (Not Found.)
-v virtualroot
Enables virtual hosting support. Directories in virtualroot
will be searched for a matching virtual host name, when
parsing the HTML request. If a matching name is found, it
will be used as both the server's real name, [myname], and as
the slashdir. See the EXAMPLES section for an example of
using this option.
-X Enables directory indexing. A directory index will be
generated only when the default index file is not present
(i.e., index.html unless changed with -x index).
-x index Changes the default file read for directories from index.html
to index.
-Z certificate_path privatekey_path
Sets the path to the server certificate file and the private
key file in PEM format. This option also causes bozohttpd to
start SSL mode.
-z ciphers
Sets the list of SSL ciphers (see SSL_CTX_set_cipher_list(3)).
Note that in bozohttpd versions 20031005 and prior that supported the -C
and -M options, they took a single space-separated argument that was
parsed. since version 20040828, they take multiple options (2 in the
case of -C and 4 in the case of -M.)
INETD CONFIGURATION
By default bozohttpd uses inetd(8) to process incoming TCP connections
for HTTP requests (unless stand-alone daemon mode is enabled with the -b
or -f options), bozohttpd has little internal networking knowledge.
(Indeed, you can run bozohttpd on the command line with little change of
functionality.) A typical inetd.conf(5) entry would be:
http stream tcp nowait:600 _httpd /usr/libexec/httpd httpd /var/www
http stream tcp6 nowait:600 _httpd /usr/libexec/httpd httpd /var/www
This would serve web pages from /var/www on both IPv4 and IPv6 ports.
The `:600' changes the requests per minute to 600, up from the inetd(8)
default of 40.
Using the NetBSD inetd(8), you can provide multiple IP-address based HTTP
servers by having multiple listening ports with different configurations.
NOTES
This server supports the HTTP/0.9, HTTP/1.0, and HTTP/1.1 standards.
Support for these protocols is very minimal and many optional features
are not supported.
bozohttpd can be compiled without CGI support (NO_CGIBIN_SUPPORT), user
transformations (NO_USER_SUPPORT), directory index support
(NO_DIRINDEX_SUPPORT), daemon mode support (NO_DAEMON_MODE), dynamic MIME
content (NO_DYNAMIC_CONTENT), Lua support (NO_LUA_SUPPORT), and SSL
support (NO_SSL_SUPPORT) by defining the listed macros when building
bozohttpd.
HTTP BASIC AUTHORIZATION
bozohttpd has support for HTTP Basic Authorization. If a file named
.htpasswd exists in the directory of the current request, bozohttpd will
restrict access to documents in that directory using the RFC 2617 HTTP
"Basic" authentication scheme.
Note: This does not recursively protect any sub-directories.
The .htpasswd file contains lines delimited with a colon containing user
names and passwords hashed with crypt(3), for example:
heather:$1$pZWI4tH/$DzDPl63i6VvVRv2lJNV7k1
jeremy:A.xewbx2DpQ8I
On NetBSD, the pwhash(1) utility may be used to generate hashed
passwords.
While bozohttpd distributed with NetBSD has support for HTTP Basic
Authorization enabled by default, in the portable distribution this
feature is disabled. Compile bozohttpd with "-DDO_HTPASSWD" on the
compiler command line to enable this support. This may require linking
with the crypt library, using "-lcrypt".
BLOCKLIST SUPPORT
On NetBSD, bozohttpd supports blocklistd(8) by default. The support can
be disabled with the "-DNO_BLOCKLIST_SUPPORT" compilation option.
Upon occurrence, bozohttpd reports two HTTP status codes to blocklistd(8)
as failures: 401 (``Unauthorized'') and 403 (``Forbidden'') . Of these,
401 is the one received upon authorization failure with the HTTP Basic
Authorization mechanism. A successful authorization decreases the
counter kept by blocklistd(8).
Note that the implementation of the HTTP Basic Authorization mechanism
uses a redirection; a status code 401 is always initially received.
Therefore, a single authorization failure of .htpasswd is reported as two
failures to blocklistd(8), but no failures are recorded upon successful
authorization due to the decrease of the failure counter.
SSL SUPPORT
bozohttpd has support for TLSv1.1 and TLSv1.2 protocols that are included
by default. This requires linking with the crypto and ssl library, using
"-lcrypto -lssl". To disable SSL SUPPORT compile bozohttpd with
"-DNO_SSL_SUPPORT" on the compiler command line.
To have an enforced redirect, such as http to https, create a shadow
directory root that contains a .bzabsredirect file that points to the
real target.
COMPRESSION
bozohttpd supports a very basic form of compression. bozohttpd will
serve the requested file postpended with ".gz" if it exists, it is
readable, the client requested gzip compression, and the client did not
make a ranged request.
FILES
bozohttpd processes specific files in each directory that enables certain
features on a per-directory basis. These per-directory files are:
.bzabsredirect
Symbolic link to the absolute URL pointed to by this symlink.
This is useful to redirect to different servers. See SYMBOLIC
LINK REDIRECTION.
.bzredirect
Symbolic link to URL for bozohttpd to perform a smart redirect
to the target of this symlink. The target is assumed to live
on the same server. If target starts with slash then absolute
redirection is performed, otherwise it is handled as relative.
See SYMBOLIC LINK REDIRECTION.
.bzremap Used by rewrite mappings; see REWRITE MAPPINGS.
.htpasswd Used by HTTP basic authorization; see HTTP BASIC
AUTHORIZATION.
SYMBOLIC LINK REDIRECTION
Two forms of redirection are supported:
1. A symbolic link without schema will use http:// as default. E.g., a
symbolic link to NetBSD.org will redirect to http://NetBSD.org/.
2. A symbolic link with a schema uses the provided schema. E.g., a
symbolic link to ftp://NetBSD.org/ will redirect to
ftp://NetBSD.org/.
REWRITE MAPPINGS
If a .bzremap file is found at the root of a (virtual) server, it is
expected to contain rewrite mappings for URLs.
These remappings are performed internally in the server before
authentication happens and can be used to hide implementation details,
like the CGI handler specific suffix for non cgi scripts in authorized
directories.
The map file consists of lines two paths separated by a colon, where the
left side needs to exactly match a (sub) path of the request and will be
replaced by the right side.
The first match always wins.
A .bzremap file could look like this:
/nic/update:/auth-dir/updipv4.pl
The remap file should be short, access to it is slow and needs to happen
on each request. If a request path needs to include a colon (`:')
character, it can be escaped with a backslash (`\') The right hand side
of the colon is always used verbatim, no escape sequences are
interpreted.
EXAMPLES
To configure set of virtual hosts, one would use an inetd.conf(5) entry
like:
http stream tcp nowait:600 _httpd /usr/libexec/httpd httpd -v /var/vroot /var/www
and inside /var/vroot create a directory (or a symlink to a directory)
with the same name as the virtual host, for each virtual host. Lookups
for these names are done in a case-insensitive manner, and may include
the port number part of the request, allowing for distinct virtual hosts
on the same name.
To use bozohttpd with PHP, one must use the -C option to specify a CGI
handler for a particular file type. Typically this will be like:
httpd -C .php /usr/pkg/bin/php-cgi /var/www
Note that a plain script interpreter can not be used directly as a
cgihandler, as there are no command line options passed from bozohttpd to
avoid security issues.
If no CGI-aware wrapper exists, a simple shell script like the following
might do.
It would be invoked like:
httpd -C .pl /www-scripts/bin/run.perl /var/www
and the script could look like:
#! /bin/sh
if [ -r "$SCRIPT_FILENAME" -a -x "$SCRIPT_FILENAME" ]; then
exec /usr/pkg/bin/perl "$SCRIPT_FILENAME"
fi
exit 1
SEE ALSO
inetd.conf(5), services(5), inetd(8)
HISTORY
bozohttpd was first written in perl, based on another perl http server
called "tinyhttpd". It was then rewritten from scratch in perl, and then
once again in C. From "bozohttpd" version 20060517, it has been
integrated into NetBSD. The focus has always been simplicity and
security, with minimal features and regular code audits. This manual
documents bozohttpd version 20240428.
AUTHORS
bozohttpd was written by Matthew R. Green <mrg@eterna23.net>.
The large list of contributors includes:
- Christoph Badura <bad@bsd.de> provided Range: header support
- Marc Balmer <mbalmer@NetBSD.org> added Lua support for dynamic
content creation
- Sean Boudreau <seanb@NetBSD.org> provided a security fix for virtual
hosting
- Julian Coleman <jdc@coris.org.uk> provided an IPv6 bugfix
- Chuck Cranor <chuck@research.att.com> provided cgi-bin support fixes,
and more
- Alistair G. Crooks <agc@NetBSD.org> cleaned up many internal
interfaces, made bozohttpd linkable as a library and provided the Lua
binding
- DEGROOTE Arnaud <degroote@NetBSD.org> provided a fix for daemon mode
- Andrew Doran <ad@NetBSD.org> provided directory indexing support
- Roland Dowdeswell <elric@NetBSD.org> added support for serving
gzipped files and better SSL handling
- Per Ekman <pek@pdc.kth.se> provided a fix for a minor (non-security)
buffer overflow condition
- <emily@ingalls.rocks> provided fixes for some bad request parsing
- Jun-ichiro itojun Hagino, KAME <itojun@iijlab.net> provided initial
IPv6 support
- Martin Husemann <martin@NetBSD.org> provided .bzabsredirect and
.bzredir support, fixed various redirection issues and more
- Arto Huusko <arto.huusko@pp2.inet.fi> provided fixes cgi-bin
- Roland Illig <roland.illig@gmx.de> provided some off-by-one fixes
- Zak Johnson <zakj@nox.cx> provided cgi-bin enhancements
- Nicolas Jombart <ecu@ipv42.net> provided fixes for HTTP basic
authorization support
- Antti Kantee <pooka@NetBSD.org> provided fixes for HTTP basic
authorization support
- Thomas Klausner <wiz@NetBSD.org> provided many fixes and enhancements
for the man page
- Mateusz Kocielski <shm@NetBSD.org> fixed memory leaks, various issues
with userdir support, information disclosure issues, added support
for using CGI handlers with directory indexing, found several
security issues and provided various other fixes
- Arnaud Lacombe <alc@NetBSD.org> provided some clean up for memory
leaks
- Johnny Lam <jlam@NetBSD.org> provided man page fixes
- Dennis Lindroos <denafcm@gmail.com> provided a cgi-bin fix
- Jared McNeill <jmcneill@NetBSD.org> added support for readme in
directory indexing
- Julio Merino <jmmv@NetBSD.org> Added the -P option (pidfile support)
and provided some man page fixes
- Luke Mewburn <lukem@NetBSD.org> provided many various fixes,
including cgi-bin fixes and enhancements, HTTP basic authorization
support and much code clean up
- Sunil Nimmagadda <sunil@nimmagadda.net> provided runtime TLS version
control
- Rajeev V. Pillai <rajeev_v_pillai@yahoo.com> provided several fixes
for virtual hosting and directory indexing and fixes for CGI
- Jeremy C. Reed <reed@NetBSD.org> provided several clean up fixes, and
man page updates
- Scott Reynolds <scottr@NetBSD.org> provided various fixes
- Tyler Retzlaff <rtr@eterna23.net> provided SSL support, cgi-bin fixes
and much other random other stuff
- rudolf <netbsd@eq.cz> provided minor compile fixes and a CGI content
map fix
- Steve Rumble <rumble@ephemeral.org> provided the -V option
- Jukka Ruohonen <jruoho@NetBSD.org> provided support for blocklistd(8)
- Thor Lancelot Simon <tls@NetBSD.org> enhanced cgi-bin support
- Joerg Sonnenberger <joerg@NetBSD.org> implemented If-Modified-Since
support
- Kimmo Suominen <kim@NetBSD.org> removed obsolete .bzdirect handling
- ISIHARA Takanori <ishit@oak.dti.ne.jp> provided a man page fix
- Holger Weiss <holger@CIS.FU-Berlin.DE> provided http authorization
fixes
- <xs@kittenz.org> provided chroot and change-to-user support, and
other various fixes
- S.P.Zeidler <spz@NetBSD.org> fixed several SSL shutdown issues
- Coyote Point provided various CGI fixes
There are probably others I have forgotten (let me know if you care)
Please send all updates to bozohttpd to <mrg@eterna23.net> or
<netbsd-bugs@NetBSD.org> for inclusion in future releases.
BUGS
bozohttpd does not handle HTTP/1.1 chunked input from the client yet.
NetBSD 11.99 November 22, 2024 NetBSD 11.99