Don't abort startup when setgid/setuid() fails with EINVAL

[ngircd-alex.git] / man / ngircd.conf.5.tmpl

.\"
.\" ngircd.conf(5) manual page template
.\"
.TH ngircd.conf 5 "Jan 2019" ngIRCd "ngIRCd Manual"
.SH NAME
ngircd.conf \- configuration file of ngIRCd
.SH SYNOPSIS
.B :ETCDIR:/ngircd.conf
.SH DESCRIPTION
.BR ngircd.conf
is the configuration file of the
.BR ngircd (8)
Internet Relay Chat (IRC) daemon, which must be customized to the local
preferences and needs.
.PP
Most variables can be modified while the ngIRCd daemon is already running:
It will reload its configuration file when a HUP signal or REHASH command
is received.
.SH "FILE FORMAT"
The file consists of sections and parameters. A section begins with the name
of the section in square brackets and continues until the next section
begins.
.PP
Sections contain parameters of the form
.PP
.RS
.I name
=
.I value
.RE
.PP
Empty lines and any line beginning with a semicolon (';') or a hash ('#')
character are treated as a comment and will be ignored. Leading and trailing
whitespaces are trimmed before any processing takes place.
.PP
The file format is line-based - that means, each non-empty newline-terminated
line represents either a comment, a section name, or a parameter.
.PP
Section and parameter names are not case sensitive.
.PP
There are three types of variables:
.I booleans,
.I text strings,
and
.I numbers.
Boolean values are
.I true
if they are "yes", "true", or any non-null integer. Text strings are used 1:1
without leading and following spaces; there is no way to quote strings. And
for numbers all decimal integer values are valid.
.PP
In addition, some string or numerical variables accept lists of values,
separated by commas (",").
.SH "SECTION OVERVIEW"
The file can contain blocks of seven types: [Global], [Limits], [Options],
[SSL], [Operator], [Server], and [Channel].
.PP
The main configuration of the server is stored in the
.I [Global]
section, like the server name, administrative information and the ports on
which the server should be listening. The variables in this section have to be
adjusted to the local requirements most of the time, whereas all the variables
in the other sections can be left on their defaults very often.
.PP
Options in the
.I [Limits]
block are used to tweak different limits and timeouts of the daemon, like the
maximum number of clients allowed to connect to this server. Variables in the
.I [Options]
section can be used to enable or disable specific features of ngIRCd, like
support for IDENT, PAM, IPv6, and protocol and cloaking features. The
.I [SSL]
block contains all SSL-related configuration variables. These three sections
are all optional.
.PP
IRC operators of this server are defined in
.I [Operator]
blocks. Links to remote servers are configured in
.I [Server]
sections. And
.I [Channel]
blocks are used to configure pre-defined ("persistent") IRC channels.
.PP
There can be more than one [Operator], [Server] and [Channel] section per
configuration file, one for each operator, server, and channel. [Global],
[Limits], [Options], and [SSL] sections can occur multiple times, too, but
each variable overwrites itself, only the last assignment is relevant.
.SH [GLOBAL]
The
.I [Global]
section is used to define the main configuration of the server,
like the server name and the ports on which the server should be listening.
These settings depend on your personal preferences, so you should make sure
that they correspond to your installation and setup!
.TP
\fBName\fR (string; required)
Server name in the IRC network. This is an individual name of the IRC
server, it is not related to the DNS host name. It must be unique in the
IRC network and must contain at least one dot (".") character.
.TP
\fBAdminInfo1\fR, \fBAdminInfo2\fR, \fBAdminEMail\fR (string)
Information about the server and the administrator, used by the ADMIN
command. This information is not required by the server but by RFC!
.TP
\fBHelpFile\fR (string)
Text file which contains the ngIRCd help text. This file is required
to display help texts when using the "HELP <cmd>" command.
Please note: Changes made to this file take effect when ngircd starts up
or is instructed to re-read its configuration file.
.TP
\fBInfo\fR (string)
Info text of the server. This will be shown by WHOIS and LINKS requests for
example.
.TP
\fBListen\fR (list of strings)
A comma separated list of IP address on which the server should listen.
If unset, the defaults value is "0.0.0.0" or, if ngIRCd was compiled
with IPv6 support, "::,0.0.0.0". So the server listens on all configured
IP addresses and interfaces by default.
.TP
\fBMotdFile\fR (string)
Text file with the "message of the day" (MOTD). This message will be shown to
all users connecting to the server. Please note: Changes made to this file
take effect when ngircd starts up or is instructed to re-read its
configuration file.
.TP
\fBMotdPhrase\fR (string)
A simple Phrase (<127 chars) if you don't want to use a MOTD file.
.TP
\fBNetwork\fR (string)
The name of the IRC network to which this server belongs. This name is
optional, should only contain ASCII characters, and can't contain spaces.
It is only used to inform clients. The default is empty, so no network
name is announced to clients.
.TP
\fBPassword\fR (string)
Global password for all users needed to connect to the server. The default is
empty, so no password is required. Please note: This feature is not available
if ngIRCd is using PAM!
.TP
\fBPidFile\fR (string)
This tells ngIRCd to write its current process ID to a file. Note that the
"PID file" is written AFTER chroot and switching the user ID, therefore the
directory the file resides in must be writable by the ngIRCd user and exist
in the chroot directory (if configured, see above).
.TP
\fBPorts\fR (list of numbers)
Port number(s) on which the server should listen for unencrypted connections.
There may be more than one port, separated with commas (","). Default: 6667.
.TP
\fBServerGID\fR (string or number)
Group ID under which the ngIRCd daemon should run; you can use the name of the
group or the numerical ID.
.PP
.RS
.B Attention:
.br
For this to work the server must have been started with root privileges!
.RE
.TP
\fBServerUID\fR (string or number)
User ID under which the ngIRCd daemon should run; you can use the name of the
user or the numerical ID.
.PP
.RS
.B Attention:
.br
For this to work the server must have been started with root privileges! In
addition, the configuration and MOTD files must be readable by this user,
otherwise RESTART and REHASH won't work!
.RE
.SH [LIMITS]
This section is used to define some limits and timeouts for this ngIRCd
instance. Default values should be safe, but it is wise to double-check :-)
.TP
\fBConnectRetry\fR (number)
The server tries every <ConnectRetry> seconds to establish a link to not yet
(or no longer) connected servers. Default: 60.
.TP
\fBIdleTimeout\fR (number)
Number of seconds after which the whole daemon should shutdown when no
connections are left active after handling at least one client (0: never). This
can be useful for testing or when ngIRCd is started using "socket activation"
with systemd(8), for example. Default: 0.
.TP
\fBMaxConnections\fR (number)
Maximum number of simultaneous in- and outbound connections the server is
allowed to accept (0: unlimited). Default: 0.
.TP
\fBMaxConnectionsIP\fR (number)
Maximum number of simultaneous connections from a single IP address that
the server will accept (0: unlimited). This configuration options lowers
the risk of denial of service attacks (DoS). Default: 5.
.TP
\fBMaxJoins\fR (number)
Maximum number of channels a user can be member of (0: no limit).
Default: 10.
.TP
\fBMaxNickLength\fR (number)
Maximum length of an user nickname (Default: 9, as in RFC 2812). Please
note that all servers in an IRC network MUST use the same maximum nickname
length!
.TP
\fBMaxPenaltyTime\fR (number)
Maximum penalty time increase in seconds, per penalty event. Set to -1 for no
limit (the default), 0 to disable penalties altogether. ngIRCd doesn't use
penalty increases higher than 2 seconds during normal operation, so values
greater than 1 rarely make sense.
.TP
\fBMaxListSize\fR (number)
Maximum number of channels returned in response to a LIST command. Default: 100.
.TP
\fBPingTimeout\fR (number)
After <PingTimeout> seconds of inactivity the server will send a PING to
the peer to test whether it is alive or not. Default: 120.
.TP
\fBPongTimeout\fR (number)
If a client fails to answer a PING with a PONG within <PongTimeout>
seconds, it will be disconnected by the server. Default: 20.
.SH [OPTIONS]
Optional features and configuration options to further tweak the behavior of
ngIRCd are configured in this section. If you want to get started quickly, you
most probably don't have to make changes here -- they are all optional.
.TP
\fBAllowedChannelTypes\fR (string)
List of allowed channel types (channel prefixes) for newly created channels
on the local server. By default, all supported channel types are allowed.
Set this variable to the empty string to disallow creation of new channels
by local clients at all. Default: #&+
.TP
\fBAllowRemoteOper\fR (boolean)
If this option is active, IRC operators connected to remote servers are allowed
to control this local server using administrative commands, for example like
CONNECT, DIE, SQUIT etc. Default: no.
.TP
\fBChrootDir\fR (string)
A directory to chroot in when everything is initialized. It doesn't need
to be populated if ngIRCd is compiled as a static binary. By default ngIRCd
won't use the chroot() feature.
.PP
.RS
.B Attention:
.br
For this to work the server must have been started with root privileges!
.RE
.TP
\fBCloakHost\fR (string)
Set this hostname for every client instead of the real one. Default: empty,
don't change. Use %x to add the hashed value of the original hostname.
.TP
\fBCloakHostModeX\fR (string)
Use this hostname for hostname cloaking on clients that have the user mode
"+x" set, instead of the name of the server. Default: empty, use the name
of the server. Use %x to add the hashed value of the original hostname
.TP
\fBCloakHostSalt\fR (string)
The Salt for cloaked hostname hashing. When undefined a random hash is
generated after each server start.
.TP
\fBCloakUserToNick\fR (boolean)
Set every clients' user name and real name to their nickname and hide the one
supplied by the IRC client. Default: no.
.TP
\fBConnectIPv4\fR (boolean)
Set this to no if you do not want ngIRCd to connect to other IRC servers using
the IPv4 protocol. This allows the usage of ngIRCd in IPv6-only setups.
Default: yes.
.TP
\fBConnectIPv6\fR (boolean)
Set this to no if you do not want ngIRCd to connect to other IRC servers using
the IPv6 protocol.
Default: yes.
.TP
\fBDefaultUserModes\fR (string)
Default user mode(s) to set on new local clients. Please note that only modes
can be set that the client could set using regular MODE commands, you can't
set "a" (away) for example!
Default: none.
.TP
\fBDNS\fR (boolean)
If set to false, ngIRCd will not make any DNS lookups when clients connect.
If you configure the daemon to connect to other servers, ngIRCd may still
perform a DNS lookup if required.
Default: yes.
.TP
\fBIdent\fR (boolean)
If ngIRCd is compiled with IDENT support this can be used to disable IDENT
lookups at run time.
Users identified using IDENT are registered without the "~" character
prepended to their user name.
Default: yes.
.TP
\fBIncludeDir\fR (string)
Directory containing configuration snippets (*.conf), that should be read in
after parsing the current configuration file.
Default: none.
.TP
\fBMorePrivacy\fR (boolean)
This will cause ngIRCd to censor user idle time, logon time as well as the
PART/QUIT messages (that are sometimes used to inform everyone about which
client software is being used). WHOWAS requests are also silently ignored,
and NAMES output doesn't list any clients for non-members.
This option is most useful when ngIRCd is being used together with
anonymizing software such as TOR or I2P and one does not wish to make it
too easy to collect statistics on the users.
Default: no.
.TP
\fBNoticeBeforeRegistration\fR (boolean)
Normally ngIRCd doesn't send any messages to a client until it is registered.
Enable this option to let the daemon send "NOTICE *" messages to clients
while connecting. Default: no.
.TP
\fBOperCanUseMode\fR (boolean)
Should IRC Operators be allowed to use the MODE command even if they are
not(!) channel-operators? Default: no.
.TP
\fBOperChanPAutoOp\fR (boolean)
Should IRC Operators get AutoOp (+o) in persistent (+P) channels?
Default: yes.
.TP
\fBOperServerMode\fR (boolean)
If \fBOperCanUseMode\fR is enabled, this may lead the compatibility problems
with Servers that run the ircd-irc2 Software. This Option "masks" mode
requests by non-chanops as if they were coming from the server. Default: no;
only enable it if you have ircd-irc2 servers in your IRC network.
.TP
\fBPAM\fR (boolean)
If ngIRCd is compiled with PAM support this can be used to disable all calls
to the PAM library at runtime; all users connecting without password are
allowed to connect, all passwords given will fail.
Users identified using PAM are registered without the "~" character
prepended to their user name.
Default: yes.
.TP
\fBPAMIsOptional\fR (boolean)
When PAM is enabled, all clients are required to be authenticated using PAM;
connecting to the server without successful PAM authentication isn't possible.
If this option is set, clients not sending a password are still allowed to
connect: they won't become "identified" and keep the "~" character prepended
to their supplied user name.
Please note:
To make some use of this behavior, it most probably isn't useful to enable
"Ident", "PAM" and "PAMIsOptional" at the same time, because you wouldn't be
able to distinguish between Ident'ified and PAM-authenticated users: both
don't have a "~" character prepended to their respective user names!
Default: no.
.TP
\fBPAMServiceName\fR (string)
When PAM is enabled, this value determines the used PAM configuration.
This setting allows running multiple ngIRCd instances with different
PAM configurations on each instance. If you set it to "ngircd-foo",
PAM will use /etc/pam.d/ngircd-foo instead of the default
/etc/pam.d/ngircd.
Default: ngircd.
.TP
\fBRequireAuthPing\fR (boolean)
Let ngIRCd send an "authentication PING" when a new client connects, and
register this client only after receiving the corresponding "PONG" reply.
Default: no.
.TP
\fBScrubCTCP\fR (boolean)
If set to true, ngIRCd will silently drop all CTCP requests sent to it from
both clients and servers. It will also not forward CTCP requests to any
other servers. CTCP requests can be used to query user clients about which
software they are using and which versions said software is. CTCP can also be
used to reveal clients IP numbers. ACTION CTCP requests are not blocked,
this means that /me commands will not be dropped, but please note that
blocking CTCP will disable file sharing between users!
Default: no.
.TP
\fBSyslogFacility\fR (string)
Syslog "facility" to which ngIRCd should send log messages. Possible
values are system dependent, but most probably "auth", "daemon", "user"
and "local1" through "local7" are possible values; see syslog(3).
Default is "local5" for historical reasons, you probably want to
change this to "daemon", for example.
.TP
\fBWebircPassword\fR (string)
Password required for using the WEBIRC command used by some Web-to-IRC
gateways. If not set or empty, the WEBIRC command can't be used.
Default: not set.
.SH [SSL]
All SSL-related configuration variables are located in the
.I [SSL]
section. Please note that this whole section is only recognized by ngIRCd
when it is compiled with support for SSL using OpenSSL or GnuTLS!
.TP
\fBCertFile\fR (string)
SSL Certificate file of the private server key.
.TP
\fBCipherList\fR (string)
Select cipher suites allowed for SSL/TLS connections.  This defaults to
"HIGH:!aNULL:@STRENGTH:!SSLv3" (OpenSSL) or "SECURE128:-VERS-SSL3.0" (GnuTLS).
Please see 'man 1ssl ciphers' (OpenSSL) and 'man 3 gnutls_priority_init'
(GnuTLS) for details.
.TP
\fBDHFile\fR (string)
Name of the Diffie-Hellman Parameter file. Can be created with GnuTLS
"certtool \-\-generate-dh-params" or "openssl dhparam". If this file is not
present, it will be generated on startup when ngIRCd was compiled with GnuTLS
support (this may take some time). If ngIRCd was compiled with OpenSSL, then
(Ephemeral)-Diffie-Hellman Key Exchanges and several Cipher Suites will not be
available.
.TP
\fBKeyFile\fR (string)
Filename of SSL Server Key to be used for SSL connections. This is required
for SSL/TLS support.
.TP
\fBKeyFilePassword\fR (string)
OpenSSL only: Password to decrypt the private key file.
.TP
\fBPorts\fR (list of numbers)
Same as \fBPorts\fR , except that ngIRCd will expect incoming connections
to be SSL/TLS encrypted. Common port numbers for SSL-encrypted IRC are 6669
and 6697. Default: none.
.SH [OPERATOR]
.I [Operator]
sections are used to define IRC Operators. There may be more than one
.I [Operator]
block, one for each local operator.
.TP
\fBName\fR (string)
ID of the operator (may be different of the nickname).
.TP
\fBPassword\fR (string)
Password of the IRC operator.
.TP
\fBMask\fR (string)
Mask that is to be checked before an /OPER for this account is accepted.
Example: nick!ident@*.example.com
.SH [SERVER]
Other servers are configured in
.I [Server]
sections. If you configure a port for the connection, then this ngIRCd
tries to connect to the other server on the given port (active);
if not, it waits for the other server to connect (passive).
.PP
ngIRCd supports "server groups": You can assign an "ID" to every server
with which you want this ngIRCd to link, and the daemon ensures that at
any given time only one direct link exists to servers with the same ID.
So if a server of a group won't answer, ngIRCd tries to connect to the next
server in the given group (="with the same ID"), but never tries to connect
to more than one server of this group simultaneously.
.PP
There may be more than one
.I [Server]
block.
.TP
\fBName\fR (string)
IRC name of the remote server.
.TP
\fBHost\fR (string)
Internet host name (or IP address) of the peer.
.TP
\fBBind\fR (string)
IP address to use as source IP for the outgoing connection. Default is
to let the operating system decide.
.TP
\fBPort\fR (number)
Port of the remote server to which ngIRCd should connect (active).
If no port is assigned to a configured server, the daemon only waits for
incoming connections (passive, default).
.TP
\fBMyPassword\fR (string)
Own password for this connection. This password has to be configured as
\fBPeerPassword\fR on the other server. Must not have ':' as first character.
.TP
\fBPeerPassword\fR (string)
Foreign password for this connection. This password has to be configured as
\fBMyPassword\fR on the other server.
.TP
\fBGroup\fR (number)
Group of this server (optional).
.TP
\fBPassive\fR (boolean)
Disable automatic connection even if port value is specified. Default: false.
You can use the IRC Operator command CONNECT later on to create the link.
.TP
\fBSSLConnect\fR (boolean)
Connect to the remote server using TLS/SSL. Default: false.
.TP
\fBServiceMask\fR (string)
Define a (case insensitive) list of masks matching nicknames that should be
treated as IRC services when introduced via this remote server, separated
by commas (","). REGULAR SERVERS DON'T NEED this parameter, so leave it empty
(which is the default).
.PP
.RS
When you are connecting IRC services which mask as a IRC server and which use
"virtual users" to communicate with, for example "NickServ" and "ChanServ",
you should set this parameter to something like "*Serv", "*Serv,OtherNick",
or "NickServ,ChanServ,XyzServ".
.SH [CHANNEL]
Pre-defined channels can be configured in
.I [Channel]
sections. Such channels are created by the server when starting up and even
persist when there are no more members left.
.PP
Persistent channels are marked with the mode 'P', which can be set and unset
by IRC operators like other modes on the fly.
.PP
There may be more than one
.I [Channel]
block.
.TP
\fBName\fR (string)
Name of the channel, including channel prefix ("#" or "&").
.TP
\fBTopic\fR (string)
Topic for this channel.
.TP
\fBModes\fR (string)
Initial channel modes.
.TP
\fBKey\fR (string)
Sets initial channel key (only relevant if channel mode "k" is set).
.TP
\fBKeyFile\fR (string)
Path and file name of a "key file" containing individual channel keys for
different users. The file consists of plain text lines with the following
syntax (without spaces!):
.PP
.RS
.RS
.I user
:
.I nick
:
.I key
.RE
.PP
.I user
and
.I nick
can contain the wildcard character "*".
.br
.I key
is an arbitrary password.
.PP
Valid examples are:
.PP
.RS
*:*:KeY
.br
*:nick:123
.br
~user:*:xyz
.RE
.PP
The key file is read on each JOIN command when this channel has a key
(channel mode +k). Access is granted, if a) the channel key set using the
MODE +k command or b) one of the lines in the key file match.
.PP
.B Please note:
.br
The file is not reopened on each access, so you can modify and overwrite it
without problems, but moving or deleting the file will have not effect until
the daemon re-reads its configuration!
.RE
.TP
\fBMaxUsers\fR (number)
Set maximum user limit for this channel (only relevant if channel mode "l"
is set).
.SH HINTS
It's wise to use "ngircd \-\-configtest" to validate the configuration file
after changing it. See
.BR ngircd (8)
for details.
.SH AUTHOR
Alexander Barton, <alex@barton.de>
.br
Florian Westphal, <fw@strlen.de>
.PP
Homepage: http://ngircd.barton.de/
.SH "SEE ALSO"
.BR ngircd (8)
.\"
.\" -eof-