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Rename

<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN"
 "http://www.w3.org/TR/html4/loose.dtd">
<html> <head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<title> Postfix manual - proxymap(8) </title>
</head> <body> <pre>
PROXYMAP(8) PROXYMAP(8)

NAME
 proxymap - Postfix lookup table proxy server

SYNOPSIS
 proxymap [generic Postfix daemon options]

DESCRIPTION
 The <a href="proxymap.8.html">proxymap(8)</a> server provides read-only or read-write table lookup
 service to Postfix processes. These services are implemented with dis-
 tinct service names: proxymap and proxywrite, respectively. The purpose
 of these services is:

o To overcome chroot restrictions. For example, a chrooted SMTP
 server needs access to the system passwd file in order to reject
 mail for non-existent local addresses, but it is not practical
 to maintain a copy of the passwd file in the chroot jail. The
 solution:

<a href="postconf.5.html#local_recipient_maps">local_recipient_maps</a> =
 <a href="proxymap.8.html">proxy</a>:unix:passwd.byname $<a href="postconf.5.html#alias_maps">alias_maps</a>

o To consolidate the number of open lookup tables by sharing one
 open table among multiple processes. For example, making mysql
 connections from every Postfix daemon process results in "too
 many connections" errors. The solution:

<a href="postconf.5.html#virtual_alias_maps">virtual_alias_maps</a> =
 <a href="proxymap.8.html">proxy</a>:<a href="mysql_table.5.html">mysql</a>:/etc/postfix/virtual_alias.cf

The  total  number  of  connections  is limited by the number of
              proxymap server processes.

o To provide single-updater functionality for lookup tables that
 do not reliably support multiple writers (i.e. all file-based
 tables).

The <a href="proxymap.8.html">proxymap(8)</a> server implements the following requests:

open maptype:mapname flags
 Open the table with type maptype and name mapname, as controlled
 by flags. The reply includes the maptype dependent flags (to
 distinguish a fixed string table from a regular expression ta-
 ble).

lookup maptype:mapname flags key
 Look up the data stored under the requested key. The reply is
 the request completion status code and the lookup result value.
 The maptype:mapname and flags are the same as with the open
 request.

update maptype:mapname flags key value
 Update the data stored under the requested key. The reply is
 the request completion status code. The maptype:mapname and
 flags are the same as with the open request.

To implement single-updater maps, specify a process limit of 1
 in the <a href="master.5.html">master.cf</a> file entry for the proxywrite service.

This request is supported in Postfix 2.5 and later.

delete maptype:mapname flags key
 Delete the data stored under the requested key. The reply is
 the request completion status code. The maptype:mapname and
 flags are the same as with the open request.

This request is supported in Postfix 2.5 and later.

sequence maptype:mapname flags function
 Iterate over the specified database. The function is one of
 DICT_SEQ_FUN_FIRST or DICT_SEQ_FUN_NEXT. The reply is the
 request completion status code and a lookup key and result
 value, if found.

This request is supported in Postfix 2.9 and later.

The request completion status is one of OK, RETRY, NOKEY (lookup failed
       because  the  key  was not found), BAD (malformed request) or DENY (the
       table is not approved for proxy read or update access).

There is no close command, nor are tables implicitly closed when a
 client disconnects. The purpose is to share tables among multiple
 client processes.

SERVER PROCESS MANAGEMENT
 <a href="proxymap.8.html">proxymap(8)</a> servers run under control by the Postfix <a href="master.8.html">master(8)</a> server.
 Each server can handle multiple simultaneous connections. When all
 servers are busy while a client connects, the <a href="master.8.html">master(8)</a> creates a new
 <a href="proxymap.8.html">proxymap(8)</a> server process, provided that the process limit is not
 exceeded. Each server terminates after serving at least $<a href="postconf.5.html#max_use">max_use</a>
 clients or after $<a href="postconf.5.html#max_idle">max_idle</a> seconds of idle time.

SECURITY
 The <a href="proxymap.8.html">proxymap(8)</a> server opens only tables that are approved via the
 <a href="postconf.5.html#proxy_read_maps">proxy_read_maps</a> or <a href="postconf.5.html#proxy_write_maps">proxy_write_maps</a> configuration parameters, does not
 talk to users, and can run at fixed low privilege, chrooted or not.
 However, running the proxymap server chrooted severely limits usabil-
 ity, because it can open only chrooted tables.

The <a href="proxymap.8.html">proxymap(8)</a> server is not a trusted daemon process, and must not be
 used to look up sensitive information such as UNIX user or group IDs,
 mailbox file/directory names or external commands.

In Postfix version 2.2 and later, the proxymap client recognizes
 requests to access a table for security-sensitive purposes, and opens
 the table directly. This allows the same <a href="postconf.5.html">main.cf</a> setting to be used by
 sensitive and non-sensitive processes.

Postfix-writable data files should be stored under a dedicated direc-
 tory that is writable only by the Postfix mail system, such as the
 Postfix-owned <a href="postconf.5.html#data_directory">data_directory</a>.

In particular, Postfix-writable files should never exist in  root-owned
       directories.  That  would  open  up  a particular type of security hole
       where ownership of a file or directory does not match the  provider  of
       its content.

DIAGNOSTICS
 Problems and transactions are logged to syslogd(8).

BUGS
 The <a href="proxymap.8.html">proxymap(8)</a> server provides service to multiple clients, and must
 therefore not be used for tables that have high-latency lookups.

The <a href="proxymap.8.html">proxymap(8)</a> read-write service does not explicitly close lookup
 tables (even if it did, this could not be relied on, because the
 process may be terminated between table updates). The read-write ser-
 vice should therefore not be used with tables that leave persistent
 storage in an inconsistent state between updates (for example, CDB).
 Tables that support "sync on update" should be safe (for example,
 Berkeley DB) as should tables that are implemented by a real DBMS.

CONFIGURATION PARAMETERS
 On busy mail systems a long time may pass before <a href="proxymap.8.html">proxymap(8)</a> relevant
 changes to <a href="postconf.5.html">main.cf</a> are picked up. Use the command "postfix reload" to
 speed up a change.

The text below provides only a parameter summary. See <a href="postconf.5.html">postconf(5)</a> for
 more details including examples.

<a href="postconf.5.html#config_directory">config_directory</a> (see 'postconf -d' output)
 The default location of the Postfix <a href="postconf.5.html">main.cf</a> and <a href="master.5.html">master.cf</a> con-
 figuration files.

<a href="postconf.5.html#data_directory">data_directory</a> (see 'postconf -d' output)
 The directory with Postfix-writable data files (for example:
 caches, pseudo-random numbers).

<a href="postconf.5.html#daemon_timeout">daemon_timeout</a> (18000s)
 How much time a Postfix daemon process may take to handle a
 request before it is terminated by a built-in watchdog timer.

<a href="postconf.5.html#ipc_timeout">ipc_timeout</a> (3600s)
 The time limit for sending or receiving information over an
 internal communication channel.

<a href="postconf.5.html#max_idle">max_idle</a> (100s)
 The maximum amount of time that an idle Postfix daemon process
 waits for an incoming connection before terminating voluntarily.

<a href="postconf.5.html#max_use">max_use</a> (100)
 The maximal number of incoming connections that a Postfix daemon
 process will service before terminating voluntarily.

<a href="postconf.5.html#process_id">process_id</a> (read-only)
 The process ID of a Postfix command or daemon process.

<a href="postconf.5.html#process_name">process_name</a> (read-only)
 The process name of a Postfix command or daemon process.

<a href="postconf.5.html#proxy_read_maps">proxy_read_maps</a> (see 'postconf -d' output)
 The lookup tables that the <a href="proxymap.8.html">proxymap(8)</a> server is allowed to
 access for the read-only service.

Available in Postfix 2.5 and later:

<a href="postconf.5.html#data_directory">data_directory</a> (see 'postconf -d' output)
 The directory with Postfix-writable data files (for example:
 caches, pseudo-random numbers).

<a href="postconf.5.html#proxy_write_maps">proxy_write_maps</a> (see 'postconf -d' output)
 The lookup tables that the <a href="proxymap.8.html">proxymap(8)</a> server is allowed to
 access for the read-write service.

SEE ALSO
 <a href="postconf.5.html">postconf(5)</a>, configuration parameters
 <a href="master.5.html">master(5)</a>, generic daemon options

README FILES
 <a href="DATABASE_README.html">DATABASE_README</a>, Postfix lookup table overview

LICENSE
 The Secure Mailer license must be distributed with this software.

HISTORY
 The proxymap service was introduced with Postfix 2.0.

AUTHOR(S)
 Wietse Venema
 IBM T.J. Watson Research
 P.O. Box 704
 Yorktown Heights, NY 10598, USA

Wietse Venema
       Google, Inc.
       111 8th Avenue
       New York, NY 10011, USA

PROXYMAP(8)
</pre> </body> </html>