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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:46:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:46:30 +0000
commitb5896ba9f6047e7031e2bdee0622d543e11a6734 (patch)
treefd7b460593a2fee1be579bec5697e6d887ea3421 /html/tlsmgr.8.html
parentInitial commit. (diff)
downloadpostfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.tar.xz
postfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.zip
Adding upstream version 3.4.23.upstream/3.4.23upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+<!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 - tlsmgr(8) </title>
+</head> <body> <pre>
+TLSMGR(8) TLSMGR(8)
+
+<b>NAME</b>
+ tlsmgr - Postfix TLS session cache and PRNG manager
+
+<b>SYNOPSIS</b>
+ <b>tlsmgr</b> [generic Postfix daemon options]
+
+<b>DESCRIPTION</b>
+ The <a href="tlsmgr.8.html"><b>tlsmgr</b>(8)</a> manages the Postfix TLS session caches. It stores and
+ retrieves cache entries on request by <a href="smtpd.8.html"><b>smtpd</b>(8)</a> and <a href="smtp.8.html"><b>smtp</b>(8)</a> processes,
+ and periodically removes entries that have expired.
+
+ The <a href="tlsmgr.8.html"><b>tlsmgr</b>(8)</a> also manages the PRNG (pseudo random number generator)
+ pool. It answers queries by the <a href="smtpd.8.html"><b>smtpd</b>(8)</a> and <a href="smtp.8.html"><b>smtp</b>(8)</a> processes to seed
+ their internal PRNG pools.
+
+ The <a href="tlsmgr.8.html"><b>tlsmgr</b>(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"><b>tlsmgr</b>(8)</a> service.
+
+ The <a href="tlsmgr.8.html"><b>tlsmgr</b>(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.
+
+<b>SECURITY</b>
+ The <a href="tlsmgr.8.html"><b>tlsmgr</b>(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"><b>tlsmgr</b>(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"><b>tlsmgr</b>(8)</a> no longer uses root
+ privileges when opening cache files. These files should now be stored
+ under the Postfix-owned <b><a href="postconf.5.html#data_directory">data_directory</a></b>. As a migration aid, an attempt
+ to open a cache file under a non-Postfix directory is redirected to the
+ Postfix-owned <b><a href="postconf.5.html#data_directory">data_directory</a></b>, and a warning is logged.
+
+<b>DIAGNOSTICS</b>
+ Problems and transactions are logged to <b>syslogd</b>(8) or <a href="postlogd.8.html"><b>postlogd</b>(8)</a>.
+
+<b>BUGS</b>
+ 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.
+
+<b>CONFIGURATION PARAMETERS</b>
+ Changes to <a href="postconf.5.html"><b>main.cf</b></a> are not picked up automatically, because <a href="tlsmgr.8.html"><b>tlsmgr</b>(8)</a>
+ is a persistent processes. Use the command "<b>postfix reload</b>" after a
+ configuration change.
+
+ The text below provides only a parameter summary. See <a href="postconf.5.html"><b>postconf</b>(5)</a> for
+ more details including examples.
+
+<b>TLS SESSION CACHE</b>
+ <b><a href="postconf.5.html#lmtp_tls_loglevel">lmtp_tls_loglevel</a> (0)</b>
+ The LMTP-specific version of the <a href="postconf.5.html#smtp_tls_loglevel">smtp_tls_loglevel</a> configuration
+ parameter.
+
+ <b><a href="postconf.5.html#lmtp_tls_session_cache_database">lmtp_tls_session_cache_database</a> (empty)</b>
+ The LMTP-specific version of the <a href="postconf.5.html#smtp_tls_session_cache_database">smtp_tls_session_cache_database</a>
+ configuration parameter.
+
+ <b><a href="postconf.5.html#lmtp_tls_session_cache_timeout">lmtp_tls_session_cache_timeout</a> (3600s)</b>
+ The LMTP-specific version of the <a href="postconf.5.html#smtp_tls_session_cache_timeout">smtp_tls_session_cache_timeout</a>
+ configuration parameter.
+
+ <b><a href="postconf.5.html#smtp_tls_loglevel">smtp_tls_loglevel</a> (0)</b>
+ Enable additional Postfix SMTP client logging of TLS activity.
+
+ <b><a href="postconf.5.html#smtp_tls_session_cache_database">smtp_tls_session_cache_database</a> (empty)</b>
+ Name of the file containing the optional Postfix SMTP client TLS
+ session cache.
+
+ <b><a href="postconf.5.html#smtp_tls_session_cache_timeout">smtp_tls_session_cache_timeout</a> (3600s)</b>
+ The expiration time of Postfix SMTP client TLS session cache
+ information.
+
+ <b><a href="postconf.5.html#smtpd_tls_loglevel">smtpd_tls_loglevel</a> (0)</b>
+ Enable additional Postfix SMTP server logging of TLS activity.
+
+ <b><a href="postconf.5.html#smtpd_tls_session_cache_database">smtpd_tls_session_cache_database</a> (empty)</b>
+ Name of the file containing the optional Postfix SMTP server TLS
+ session cache.
+
+ <b><a href="postconf.5.html#smtpd_tls_session_cache_timeout">smtpd_tls_session_cache_timeout</a> (3600s)</b>
+ The expiration time of Postfix SMTP server TLS session cache
+ information.
+
+<b>PSEUDO RANDOM NUMBER GENERATOR</b>
+ <b><a href="postconf.5.html#tls_random_source">tls_random_source</a> (see 'postconf -d' output)</b>
+ The external entropy source for the in-memory <a href="tlsmgr.8.html"><b>tlsmgr</b>(8)</a> pseudo
+ random number generator (PRNG) pool.
+
+ <b><a href="postconf.5.html#tls_random_bytes">tls_random_bytes</a> (32)</b>
+ The number of bytes that <a href="tlsmgr.8.html"><b>tlsmgr</b>(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.
+
+ <b><a href="postconf.5.html#tls_random_exchange_name">tls_random_exchange_name</a> (see 'postconf -d' output)</b>
+ Name of the pseudo random number generator (PRNG) state file
+ that is maintained by <a href="tlsmgr.8.html"><b>tlsmgr</b>(8)</a>.
+
+ <b><a href="postconf.5.html#tls_random_prng_update_period">tls_random_prng_update_period</a> (3600s)</b>
+ The time between attempts by <a href="tlsmgr.8.html"><b>tlsmgr</b>(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>.
+
+ <b><a href="postconf.5.html#tls_random_reseed_period">tls_random_reseed_period</a> (3600s)</b>
+ The maximal time between attempts by <a href="tlsmgr.8.html"><b>tlsmgr</b>(8)</a> to re-seed the
+ in-memory pseudo random number generator (PRNG) pool from exter-
+ nal sources.
+
+<b>MISCELLANEOUS CONTROLS</b>
+ <b><a href="postconf.5.html#config_directory">config_directory</a> (see 'postconf -d' output)</b>
+ 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.
+
+ <b><a href="postconf.5.html#data_directory">data_directory</a> (see 'postconf -d' output)</b>
+ The directory with Postfix-writable data files (for example:
+ caches, pseudo-random numbers).
+
+ <b><a href="postconf.5.html#daemon_timeout">daemon_timeout</a> (18000s)</b>
+ How much time a Postfix daemon process may take to handle a
+ request before it is terminated by a built-in watchdog timer.
+
+ <b><a href="postconf.5.html#process_id">process_id</a> (read-only)</b>
+ The process ID of a Postfix command or daemon process.
+
+ <b><a href="postconf.5.html#process_name">process_name</a> (read-only)</b>
+ The process name of a Postfix command or daemon process.
+
+ <b><a href="postconf.5.html#syslog_facility">syslog_facility</a> (mail)</b>
+ The syslog facility of Postfix logging.
+
+ <b><a href="postconf.5.html#syslog_name">syslog_name</a> (see 'postconf -d' output)</b>
+ A prefix that is prepended to the process name in syslog
+ records, so that, for example, "smtpd" becomes "prefix/smtpd".
+
+ Available in Postfix 3.3 and later:
+
+ <b><a href="postconf.5.html#service_name">service_name</a> (read-only)</b>
+ The <a href="master.5.html">master.cf</a> service name of a Postfix daemon process.
+
+<b>SEE ALSO</b>
+ <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
+ <a href="postlogd.8.html">postlogd(8)</a>, Postfix logging
+ syslogd(8), system logging
+
+<b>README FILES</b>
+ <a href="TLS_README.html">TLS_README</a>, Postfix TLS configuration and operation
+
+<b>LICENSE</b>
+ The Secure Mailer license must be distributed with this software.
+
+<b>HISTORY</b>
+ This service was introduced with Postfix version 2.2.
+
+<b>AUTHOR(S)</b>
+ 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>
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