Provided by: ircd-irc2_2.11.2p3~dfsg-7.1_amd64 
NAME
iauth.conf - The Internet Relay Chat Authentication Configuration File
DESCRIPTION
The iauth.conf file is read by the iauth program upon startup, it contains the list of modules that
should be used to authenticate a particular connection. The list is ordered, which means that the first
module to successfully authenticate a connection will be the last to be tried.
The file is divided in sections, the first section is used for iauth options, each subsequent section
specifies a module with eventual options using the following format:
module module-name
[TAB]option = string
[TAB]host = host-name
[TAB]ip = ip-address
[TAB]timeout = value
[TAB]port = value
[TAB]reason = string
The section ends with an empty line. The module-name defines which module the section applies to. A
particular module may be used in several sections. An option string of undefined format may be
specified, it will then be passed to the module upon initialization, see the MODULES section to find out
if a module accepts any option.
If host-name and ip-address fields are specified, then the module will only be used for connections
matching one of the fields given in the configuration. An entry prefixed with the character ! indicates
a negative match. IP addresses are checked first.
Port is mandatory for socks and webproxy modules and not used in others. It tells module what port it
should connect to to do its work.
If no host nor ip entry is specified, then the module will always be used.
Reason is text to send to clients rejected by given module.
When writing a configuration file, one should always verify the syntax using the iauth program to avoid
later problems.
IAUTH OPTIONS
timeout = <seconds>
This allows one to specify how much time each module has to complete its work for each connection.
This option can also be specified individually for each module. The default is 30 seconds.
required
By specifying this keyword, the IRC server is told not to accept new user connections unless the
authentication is handled by iauth. This does NOT mean that the server will wait forever to get
the data from iauth, see the notimeout option.
notimeout
By specifying this keyword, the IRC server is told not to accept a user connection if iauth hasn't
finished its work in time. Note that modules specified after delayed keyword are not considered.
extinfo
This keyword allows extra information (user supplied username, and eventually password) to be
received by iauth from the server. This is only useful if a module using this information is
loaded.
delayed
All modules below this keyword will run in "delayed" execution mode. This means that ircd gets
(fake) message that iauth is done with this client so that it allows it. Modules however do work
as usual and upon deciding that this client should be removed, message is sent to ircd and client
removed.
shared <name> <mod_name.so>
If iauth was compiled with Dynamically Shared Module support, it can be told to dynamically load a
module using this option. The module can then be loaded.
MODULES
pipe This module is provided as a replacement to the (now obsolete) R configuration lines supported by
the IRC daemon. It runs an external program with the client IP and port as arguments. The
program should output either 'Y' (Yes, let the client in), or 'N' (No, don't let them in).
Note that this module is quite expensive as it forks a separate process for each connection
received by the IRC daemon.
This module requires the following option: prog=/path/to/external/program
socks This module performs a basic check to verify that the host where the connection originated from
doesn't run a SOCKS v4 or v5 proxy server on a given in configuration port that is open to the
world. It is useful to reject abusive clients using a relay to evade kill lines and bans.
Multiple instances (with different ports) are allowed.
This module understands ten options: reject to reject connections originating from a host where an
open proxy was detected, log to log hostnames where an open proxy is detected. protocol to log
protocol errors paranoid to consider proxies which deny the request because of a userid/ident
mismatch to be OPEN proxies. megaparanoid which is paranoid plus it considers all proxies not
explicitly stating they are closed to be OPEN proxies -- that includes all protocol errors,
unexpected results etc. cache[=value] to set the cache lifetime in minutes. By default, caching
is enabled for 30 minutes. A value of 0 disables caching. careful to make sure socks v5 is
properly configured with IP rulesets. Without this parameter, module will not send additional
query and assume first positive answer as valid. v4only to check only socks v4. v5only to check
only socks v5.
rfc931 This module is for authentication TCP connections using the protocol defined in RFC 1413 (which
obsoletes RFC 931). It is always loaded, and does not recognize the host nor ip fields.
lhex This module acts as a proxy, communicating with a LHEx server to perform authentication of client
connections. It takes a single (mandatory) option, which is the IP-address of the LHEx server to
use.
webproxy
This module performs a basic HTTP CONNECT to verify that the host where the connection originated
from doesn't run an open WWW proxy. It is useful to reject abusive clients using a relay to evade
kill lines and bans. Multiple instances (with different ports) are allowed.
This module understands five options: reject to reject connections originating from a host where
an open proxy was detected. log to log hostnames where an open proxy is detected. cache[=value]
to set the cache lifetime in minutes. By default, caching is enabled for 30 minutes. A value of
0 disables caching. careful to make sure that we connected to our own ircd; without this
parameter, module will accept any "HTTP/1.? 200" with an exception of servers sending "Date:"
header along (which is common with some Apache+PHP configurations).
EXAMPLE
The following file will cause the IRC daemon to reject all connections originating from a system where an
open proxy is running for hosts within *.fr and *.enserb.u-bordeaux.fr but not for other hosts matching
*.u-bordeaux.fr. For all connections, an ident lookup (RFC 1413) will be performed as well as checking
for WWW proxy on port 8080 and 3128. In addition, every connection is authenticated with the LHEx server
at IP-address 127.0.0.1. Client will be let in after ident and lhex are done but if socks or webproxy
finds an open proxy, client will be removed asap.
module rfc931
module lhex
option = 127.0.0.1
delayed
module socks
option = reject,paranoid
host = *.enserb.u-bordeaux.fr
host = !*.u-bordeaux.fr
host = *.fr
port = 1080
module webproxy
option = reject
port = 8080
module webproxy
option = reject,careful
port = 3128
CAVEATS
When the option extinfo is set, connections registering as a server or a service with the IRC server are
not guaranteed to receive the "user" authentication provided by modules (such as the rfc931 module).
COPYRIGHT
(c) 1998,1999 Christophe Kalt
For full COPYRIGHT see LICENSE file with IRC package.
FILES
"iauth.conf"
SEE ALSO
iauth(8)
AUTHOR
Christophe Kalt.
$Date: 2004/12/16 16:14:06 $ IAUTH.CONF(5)