path: root/usr.sbin/smtpd/table.5

.\"	$OpenBSD: table.5,v 1.7 2017/04/04 14:33:44 jmc Exp $
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.\" Copyright (c) 2013 Eric Faurot <eric@openbsd.org>
.\" Copyright (c) 2013 Gilles Chehade <gilles@poolp.org>
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.Dd $Mdocdate: April 4 2017 $
.Dt TABLE 5
.Os
.Sh NAME
.Nm table
.Nd format description for smtpd tables
.Sh DESCRIPTION
This manual page documents the file format for the various tables used in the
.Xr smtpd 8
mail daemon.
.Pp
The format described here applies to tables as defined in
.Xr smtpd.conf 5 .
.Sh TABLE TYPES
There are two types of tables: lists and mappings.
A list consists of a series of values,
while a mapping consists of a series of keys and their associated values.
The following illustrates how to declare them as static tables:
.Bd -literal -offset indent
table mylist { value1, value2, value3 }
table mymapping { key1 = value1, key2 = value2, key3 = value3 }
.Ed
.Pp
When using a
.Ql file
table, a list will be written with each value on a line by itself.
Comments can be put anywhere in the file using a hash mark
.Pq Sq # ,
and extend to the end of the current line.
.Bd -literal -offset indent
value1
value2
value3
.Ed
.Pp
A mapping will be written with each key and value on a line,
whitespaces separating both columns:
.Bd -literal -offset indent
key1	value1
key2	value2
key3	value3
.Ed
.Pp
A file table can be converted to a Berkeley database using the
.Xr makemap 8
utility with no syntax change.
.Pp
Tables using a
.Ql file
or Berkeley DB backend will be referenced as follows:
.Bd -literal -offset indent
table name file:/path/to/file
table name db:/path/to/file.db
.Ed
.Ss Aliasing tables
Aliasing tables are mappings that associate a recipient to one or many
destinations.
They can be used in two contexts: primary domain aliases and virtual domain
mapping.
.Bd -literal -offset indent
accept for domain example.org alias <myaliases> deliver to mbox
accept for domain example.org virtual <myaliases> deliver to mbox
.Ed
.Pp
In a primary domain context, the key is the user part of the recipient address,
whilst the value is one or many recipients as described in
.Xr aliases 5 :
.Bd -literal -offset indent
user1	otheruser
user2	otheruser1,otheruser2
user3	otheruser@example.com
.Ed
.Pp
In a virtual domain context, the key is either a user part, a full email
address or a catch all, following selection rules described in
.Xr smtpd.conf 5 ,
and the value is one or many recipients as described in
.Xr aliases 5 :
.Bd -literal -offset indent
user1			otheruser
user2@example.org	otheruser1,otheruser2
@example.org		otheruser@example.com
@			catchall@example.com
.Ed
.Ss Domain tables
Domain tables are simple lists of domains.
They can only be used in one context:
.Bd -literal -offset indent
accept for domain <mydomains> deliver to mbox
.Ed
.Pp
In that context, the list of domains will be matched against the recipient
domain.
For
.Ql static ,
.Ql file
and
.Xr dbopen 3
backends, a wildcard may be used so the domain table may contain:
.Bd -literal -offset indent
example.org
*.example.org
.Ed
.Ss Credentials tables
Credentials tables are mappings of credentials.
They can be used in two contexts:
.Bd -literal -offset indent
listen on tls [...] auth <credentials>
accept for any relay tls+auth://label@host auth <credentials>
.Ed
.Pp
In a listener context, the credentials are a mapping of username and encrypted
passwords:
.Bd -literal -offset indent
user1	$2b$10$hIJ4QfMcp.90nJwKqGbKM.MybArjHOTpEtoTV.DgLYAiThuoYmTSe
user2	$2b$10$bwSmUOBGcZGamIfRuXGTvuTo3VLbPG9k5yeKNMBtULBhksV5KdGsK
.Ed
.Pp
The passwords are to be encrypted using the
.Xr smtpctl 8
encrypt subcommand.
.Pp
In a relay context, the credentials are a mapping of labels and
username:password pairs,
where the username may be omitted if identical to the label:
.Bd -literal -offset indent
label1	user:password
label2	password
.Ed
.Pp
The label must be unique and is used as a selector for the proper credentials
when multiple credentials are valid for a single destination.
The password is not encrypted as it must be provided to the remote host.
.Ss Netaddr tables
Netaddr tables are lists of IPv4 and IPv6 network addresses.
They can only be used in the following context:
.Bd -literal -offset indent
accept from source <netaddr> for domain example.org deliver to mbox
.Ed
.Pp
When used as a "from source", the address of a client is compared to the list
of addresses in the table until a match is found.
.Pp
A netaddr table can contain exact addresses or netmasks, and looks as follow:
.Bd -literal -offset indent
192.168.1.1
::1
ipv6:::1
192.168.1.0/24
.Ed
.Ss Userinfo tables
User info tables are used to described virtual system users.
They are used in rule context to specify an alternate user base, mapping
virtual users to local system UID, GID and home directory.
.Bd -literal -offset indent
accept for domain example.org userbase <userinfo> deliver to maildir
.Ed
.Pp
The userinfo table is a mapping from virtual user names to a set of system user
ID, group ID and path to home directory.
.Pp
A userinfo table looks as follows:
.Bd -literal -offset indent
joe	1000:100:/home/virtual/joe
jack	1000:100:/home/virtual/jack
.Ed
.Pp
In this example, both joe and jack are virtual users mapped to the local
system user with UID 1000 and GID 100, but different home directories.
These directories may contain a
.Xr forward 5
file.
.Ss Source tables
Source tables are lists of IPv4 and IPv6 addresses.
They can only be used in the following context:
.Bd -literal -offset indent
accept for domain example.org relay source <addresses>
.Ed
.Pp
Successive queries to the source table will return the elements one by one.
.Pp
A source table looks as follow:
.Bd -literal -offset indent
192.168.1.2
192.168.1.3
::1
::2
ipv6:::3
ipv6:::4
.Ed
.Ss Mailaddr tables
Mailaddr tables are lists of email addresses.
They can be used in the following contexts:
.Bd -literal -offset indent
accept sender <senders> for domain example.org deliver to mbox
accept for domain example.org recipient <recipients> deliver to mbox
.Ed
.Pp
A mailaddr entry is used to match an email address against a username,
a domain or a full email address.
A "*" wildcard may be used in part of the domain name.
.Pp
A mailaddr table looks as follow:
.Bd -literal -offset indent
user
@domain
user@domain
user@*.domain
.Ed
.Ss Addrname tables
Addrname tables are used to map IP addresses to hostnames.
They can be used in both listen context and relay context:
.Bd -literal -offset indent
listen on 0.0.0.0 hostnames <addrname>
accept for any relay hostnames <addrname>
.Ed
.Pp
In listen context, the table is used to look up the server name to advertise
depending on the local address of the socket on which a connection is accepted.
In relay context, the table is used to determine the hostname for the HELO
sequence of the SMTP protocol, depending on the local address used for the
outgoing connection.
.Pp
The format is a mapping from inet4 or inet6 addresses to hostnames:
.Bd -literal -offset indent
::1		localhost
127.0.0.1	localhost
88.190.23.165	www.opensmtpd.org
.Ed
.Sh SEE ALSO
.Xr smtpd.conf 5 ,
.Xr makemap 8 ,
.Xr smtpd 8