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TLSMGR(8)                                                                                          TLSMGR(8)



NAME
       tlsmgr - Postfix TLS session cache and PRNG manager

SYNOPSIS
       tlsmgr [generic Postfix daemon options]

DESCRIPTION
       The  tlsmgr(8)  manages  the  Postfix  TLS  session caches.  It stores and retrieves cache entries on
       request by smtpd(8) and smtp(8) processes, and periodically removes entries that have expired.

       The tlsmgr(8) also manages the PRNG (pseudo random number generator) pool. It answers queries by  the
       smtpd(8) and smtp(8) processes to seed their internal PRNG pools.

       The  tlsmgr(8)'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 tlsmgr(8) service.

       The tlsmgr(8) saves the PRNG state to an exchange file periodically and when the process  terminates,
       and reads the exchange file when initializing its PRNG.

SECURITY
       The tlsmgr(8) 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 internal PRNG pool.

       The tlsmgr(8) 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 tlsmgr(8) no longer uses root privileges when  opening  cache
       files.  These files should now be stored under the Postfix-owned data_directory.  As a migration aid,
       an attempt to open a cache file under a non-Postfix directory  is  redirected  to  the  Postfix-owned
       data_directory, 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 main.cf are not picked up automatically, because tlsmgr(8) is a persistent processes.  Use
       the command "postfix reload" after a configuration change.

       The  text  below  provides only a parameter summary. See postconf(5) for more details including exam-ples. examples.
       ples.

TLS SESSION CACHE
       lmtp_tls_loglevel (0)
              The LMTP-specific version of the smtp_tls_loglevel configuration parameter.

       lmtp_tls_session_cache_database (empty)
              The LMTP-specific version of the smtp_tls_session_cache_database configuration parameter.

       lmtp_tls_session_cache_timeout (3600s)
              The LMTP-specific version of the smtp_tls_session_cache_timeout configuration parameter.

       smtp_tls_loglevel (0)
              Enable additional Postfix SMTP client logging of TLS activity.

       smtp_tls_session_cache_database (empty)
              Name of the file containing the optional Postfix SMTP client TLS session cache.

       smtp_tls_session_cache_timeout (3600s)
              The expiration time of Postfix SMTP client TLS session cache information.

       smtpd_tls_loglevel (0)
              Enable additional Postfix SMTP server logging of TLS activity.

       smtpd_tls_session_cache_database (empty)
              Name of the file containing the optional Postfix SMTP server TLS session cache.

       smtpd_tls_session_cache_timeout (3600s)
              The expiration time of Postfix SMTP server TLS session cache information.

PSEUDO RANDOM NUMBER GENERATOR
       tls_random_source (see 'postconf -d' output)
              The external entropy source for the in-memory tlsmgr(8) pseudo random number generator  (PRNG)
              pool.

       tls_random_bytes (32)
              The  number of bytes that tlsmgr(8) reads from $tls_random_source when (re)seeding the in-mem-ory in-memory
              ory pseudo random number generator (PRNG) pool.

       tls_random_exchange_name (see 'postconf -d' output)
              Name of the pseudo random number generator (PRNG) state file that is maintained by  tlsmgr(8).

       tls_random_prng_update_period (3600s)
              The time between attempts by tlsmgr(8) to save the state of the pseudo random number generator
              (PRNG) to the file specified with $tls_random_exchange_name.

       tls_random_reseed_period (3600s)
              The maximal time between attempts by tlsmgr(8) to re-seed the in-memory pseudo  random  number
              generator (PRNG) pool from external sources.

MISCELLANEOUS CONTROLS
       config_directory (see 'postconf -d' output)
              The default location of the Postfix main.cf and master.cf configuration files.

       data_directory (see 'postconf -d' output)
              The directory with Postfix-writable data files (for example: caches, pseudo-random numbers).

       daemon_timeout (18000s)
              How much time a Postfix daemon process may take to handle a request before it is terminated by
              a built-in watchdog timer.

       process_id (read-only)
              The process ID of a Postfix command or daemon process.

       process_name (read-only)
              The process name of a Postfix command or daemon process.

       syslog_facility (mail)
              The syslog facility of Postfix logging.

       syslog_name (see 'postconf -d' output)
              The mail system name that is prepended to the process name in syslog records, so that  "smtpd"
              becomes, for example, "postfix/smtpd".

SEE ALSO
       smtp(8), Postfix SMTP client
       smtpd(8), Postfix SMTP server
       postconf(5), configuration parameters
       master(5), generic daemon options
       master(8), process manager
       syslogd(8), system logging

README FILES
       Use "postconf readme_directory" or "postconf html_directory" to locate this information.
       TLS_README, Postfix TLS configuration and operation

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

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



                                                                                                   TLSMGR(8)