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Rename

<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN"
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<title> Postfix manual - tlsmgr(8) </title>
</head> <body> <pre>
TLSMGR(8) TLSMGR(8)

NAME
 tlsmgr - Postfix TLS session cache and PRNG manager

SYNOPSIS
 tlsmgr [generic Postfix daemon options]

DESCRIPTION
 The <a href="tlsmgr.8.html">tlsmgr(8)</a> manages the Postfix TLS session caches. It stores and
 retrieves cache entries on request by <a href="smtpd.8.html">smtpd(8)</a> and <a href="smtp.8.html">smtp(8)</a> processes,
 and periodically removes entries that have expired.

The <a href="tlsmgr.8.html">tlsmgr(8)</a> also manages the PRNG (pseudo random number generator)
 pool. It answers queries by the <a href="smtpd.8.html">smtpd(8)</a> and <a href="smtp.8.html">smtp(8)</a> processes to seed
 their internal PRNG pools.

The <a href="tlsmgr.8.html">tlsmgr(8)</a>'s PRNG pool is initially seeded from an external source
 (EGD, /dev/urandom, or regular file). It is updated at configurable
 pseudo-random intervals with data from the external source. It is
 updated periodically with data from TLS session cache entries and with
 the time of day, and is updated with the time of day whenever a process
 requests <a href="tlsmgr.8.html">tlsmgr(8)</a> service.

The <a href="tlsmgr.8.html">tlsmgr(8)</a> saves the PRNG state to an exchange file periodically and
 when the process terminates, and reads the exchange file when initial-
 izing its PRNG.

SECURITY
 The <a href="tlsmgr.8.html">tlsmgr(8)</a> is not security-sensitive. The code that maintains the
 external and internal PRNG pools does not "trust" the data that it
 manipulates, and the code that maintains the TLS session cache does not
 touch the contents of the cached entries, except for seeding its inter-
 nal PRNG pool.

The <a href="tlsmgr.8.html">tlsmgr(8)</a> can be run chrooted and with reduced privileges. At
 process startup it connects to the entropy source and exchange file,
 and creates or truncates the optional TLS session cache files.

With Postfix version 2.5 and later, the <a href="tlsmgr.8.html">tlsmgr(8)</a> no longer uses root
 privileges when opening cache files. These files should now be stored
 under the Postfix-owned <a href="postconf.5.html#data_directory">data_directory</a>. As a migration aid, an attempt
 to open a cache file under a non-Postfix directory is redirected to the
 Postfix-owned <a href="postconf.5.html#data_directory">data_directory</a>, and a warning is logged.

DIAGNOSTICS
 Problems and transactions are logged to the syslog daemon.

BUGS
 There is no automatic means to limit the number of entries in the TLS
 session caches and/or the size of the TLS cache files.

CONFIGURATION PARAMETERS
 Changes to <a href="postconf.5.html">main.cf</a> are not picked up automatically, because <a href="tlsmgr.8.html">tlsmgr(8)</a>
 is a persistent processes. Use the command "postfix reload" after a
 configuration change.

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

TLS SESSION CACHE
 <a href="postconf.5.html#lmtp_tls_loglevel">lmtp_tls_loglevel</a> (0)
 The LMTP-specific version of the <a href="postconf.5.html#smtp_tls_loglevel">smtp_tls_loglevel</a> configuration
 parameter.

<a href="postconf.5.html#lmtp_tls_session_cache_database">lmtp_tls_session_cache_database</a> (empty)
 The LMTP-specific version of the <a href="postconf.5.html#smtp_tls_session_cache_database">smtp_tls_session_cache_database</a>
 configuration parameter.

<a href="postconf.5.html#lmtp_tls_session_cache_timeout">lmtp_tls_session_cache_timeout</a> (3600s)
 The LMTP-specific version of the <a href="postconf.5.html#smtp_tls_session_cache_timeout">smtp_tls_session_cache_timeout</a>
 configuration parameter.

<a href="postconf.5.html#smtp_tls_loglevel">smtp_tls_loglevel</a> (0)
 Enable additional Postfix SMTP client logging of TLS activity.

<a href="postconf.5.html#smtp_tls_session_cache_database">smtp_tls_session_cache_database</a> (empty)
 Name of the file containing the optional Postfix SMTP client TLS
 session cache.

<a href="postconf.5.html#smtp_tls_session_cache_timeout">smtp_tls_session_cache_timeout</a> (3600s)
 The expiration time of Postfix SMTP client TLS session cache
 information.

<a href="postconf.5.html#smtpd_tls_loglevel">smtpd_tls_loglevel</a> (0)
 Enable additional Postfix SMTP server logging of TLS activity.

<a href="postconf.5.html#smtpd_tls_session_cache_database">smtpd_tls_session_cache_database</a> (empty)
 Name of the file containing the optional Postfix SMTP server TLS
 session cache.

<a href="postconf.5.html#smtpd_tls_session_cache_timeout">smtpd_tls_session_cache_timeout</a> (3600s)
 The expiration time of Postfix SMTP server TLS session cache
 information.

PSEUDO RANDOM NUMBER GENERATOR
 <a href="postconf.5.html#tls_random_source">tls_random_source</a> (see 'postconf -d' output)
 The external entropy source for the in-memory <a href="tlsmgr.8.html">tlsmgr(8)</a> pseudo
 random number generator (PRNG) pool.

<a href="postconf.5.html#tls_random_bytes">tls_random_bytes</a> (32)
 The number of bytes that <a href="tlsmgr.8.html">tlsmgr(8)</a> reads from $<a href="postconf.5.html#tls_random_source">tls_random_source</a>
 when (re)seeding the in-memory pseudo random number generator
 (PRNG) pool.

<a href="postconf.5.html#tls_random_exchange_name">tls_random_exchange_name</a> (see 'postconf -d' output)
 Name of the pseudo random number generator (PRNG) state file
 that is maintained by <a href="tlsmgr.8.html">tlsmgr(8)</a>.

<a href="postconf.5.html#tls_random_prng_update_period">tls_random_prng_update_period</a> (3600s)
 The time between attempts by <a href="tlsmgr.8.html">tlsmgr(8)</a> to save the state of the
 pseudo random number generator (PRNG) to the file specified with
 $<a href="postconf.5.html#tls_random_exchange_name">tls_random_exchange_name</a>.

<a href="postconf.5.html#tls_random_reseed_period">tls_random_reseed_period</a> (3600s)
 The maximal time between attempts by <a href="tlsmgr.8.html">tlsmgr(8)</a> to re-seed the
 in-memory pseudo random number generator (PRNG) pool from exter-
 nal sources.

MISCELLANEOUS CONTROLS
 <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#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#syslog_facility">syslog_facility</a> (mail)
 The syslog facility of Postfix logging.

<a href="postconf.5.html#syslog_name">syslog_name</a> (see 'postconf -d' output)
 The mail system name that is prepended to the process name in
 syslog records, so that "smtpd" becomes, for example, "post-
 fix/smtpd".

SEE ALSO
 <a href="smtp.8.html">smtp(8)</a>, Postfix SMTP client
 <a href="smtpd.8.html">smtpd(8)</a>, Postfix SMTP server
 <a href="postconf.5.html">postconf(5)</a>, configuration parameters
 <a href="master.5.html">master(5)</a>, generic daemon options
 <a href="master.8.html">master(8)</a>, process manager
 syslogd(8), system logging

README FILES
 <a href="TLS_README.html">TLS_README</a>, Postfix TLS configuration and operation

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

HISTORY
 This service was introduced with Postfix version 2.2.

AUTHOR(S)
 Lutz Jaenicke
 BTU Cottbus
 Allgemeine Elektrotechnik
 Universitaetsplatz 3-4
 D-03044 Cottbus, Germany

Adapted by:
       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

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