1TLSMGR(8) System Manager's Manual TLSMGR(8)
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6 tlsmgr - Postfix TLS session cache and PRNG manager
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9 tlsmgr [generic Postfix daemon options]
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12 The tlsmgr(8) manages the Postfix TLS session caches. It stores and
13 retrieves cache entries on request by smtpd(8) and smtp(8) processes,
14 and periodically removes entries that have expired.
15 The tlsmgr(8) also manages the PRNG (pseudo random number generator)
17 pool. It answers queries by the smtpd(8) and smtp(8) processes to seed
18 their internal PRNG pools.
19 The tlsmgr(8)'s PRNG pool is initially seeded from an external source
21 (EGD, /dev/urandom, or regular file). It is updated at configurable
22 pseudo-random intervals with data from the external source. It is
23 updated periodically with data from TLS session cache entries and with
24 the time of day, and is updated with the time of day whenever a process
25 requests tlsmgr(8) service.
26 The tlsmgr(8) saves the PRNG state to an exchange file periodically and
28 when the process terminates, and reads the exchange file when initial‐
29 izing its PRNG.
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32 The tlsmgr(8) is not security-sensitive. The code that maintains the
33 external and internal PRNG pools does not "trust" the data that it
34 manipulates, and the code that maintains the TLS session cache does not
35 touch the contents of the cached entries, except for seeding its inter‐
36 nal PRNG pool.
37 The tlsmgr(8) can be run chrooted and with reduced privileges. At
39 process startup it connects to the entropy source and exchange file,
40 and creates or truncates the optional TLS session cache files.
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43 Problems and transactions are logged to the syslog daemon.
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46 There is no automatic means to limit the number of entries in the TLS
47 session caches and/or the size of the TLS cache files.
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50 Changes to main.cf are not picked up automatically, because tlsmgr(8)
51 is a persistent processes. Use the command "postfix reload" after a
52 configuration change.
53 The text below provides only a parameter summary. See postconf(5) for
55 more details including examples.
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58 lmtp_tls_loglevel (0)
59 The LMTP-specific version of the smtp_tls_loglevel configuration
60 parameter.
61 lmtp_tls_session_cache_database (empty)
63 The LMTP-specific version of the smtp_tls_session_cache_database
64 configuration parameter.
65 lmtp_tls_session_cache_timeout (3600s)
67 The LMTP-specific version of the smtp_tls_session_cache_timeout
68 configuration parameter.
69 smtp_tls_loglevel (0)
71 Enable additional Postfix SMTP client logging of TLS activity.
72 smtp_tls_session_cache_database (empty)
74 Name of the file containing the optional Postfix SMTP client TLS
75 session cache.
76 smtp_tls_session_cache_timeout (3600s)
78 The expiration time of Postfix SMTP client TLS session cache
79 information.
80 smtpd_tls_loglevel (0)
82 Enable additional Postfix SMTP server logging of TLS activity.
83 smtpd_tls_session_cache_database (empty)
85 Name of the file containing the optional Postfix SMTP server TLS
86 session cache.
87 smtpd_tls_session_cache_timeout (3600s)
89 The expiration time of Postfix SMTP server TLS session cache
90 information.
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93 tls_random_source (see 'postconf -d' output)
94 The external entropy source for the in-memory tlsmgr(8) pseudo
95 random number generator (PRNG) pool.
96 tls_random_bytes (32)
98 The number of bytes that tlsmgr(8) reads from $tls_random_source
99 when (re)seeding the in-memory pseudo random number generator
100 (PRNG) pool.
101 tls_random_exchange_name (${config_directory}/prng_exch)
103 Name of the pseudo random number generator (PRNG) state file
104 that is maintained by tlsmgr(8).
105 tls_random_prng_update_period (3600s)
107 The time between attempts by tlsmgr(8) to save the state of the
108 pseudo random number generator (PRNG) to the file specified with
109 $tls_random_exchange_name.
110 tls_random_reseed_period (3600s)
112 The maximal time between attempts by tlsmgr(8) to re-seed the
113 in-memory pseudo random number generator (PRNG) pool from exter‐
114 nal sources.
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117 config_directory (see 'postconf -d' output)
118 The default location of the Postfix main.cf and master.cf con‐
119 figuration files.
120 daemon_timeout (18000s)
122 How much time a Postfix daemon process may take to handle a
123 request before it is terminated by a built-in watchdog timer.
124 process_id (read-only)
126 The process ID of a Postfix command or daemon process.
127 process_name (read-only)
129 The process name of a Postfix command or daemon process.
130 syslog_facility (mail)
132 The syslog facility of Postfix logging.
133 syslog_name (postfix)
135 The mail system name that is prepended to the process name in
136 syslog records, so that "smtpd" becomes, for example, "post‐
137 fix/smtpd".
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140 smtp(8), Postfix SMTP client
141 smtpd(8), Postfix SMTP server
142 postconf(5), configuration parameters
143 master(5), generic daemon options
144 master(8), process manager
145 syslogd(8), system logging
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148 Use "postconf readme_directory" or "postconf html_directory" to locate
149 this information.
150 TLS_README, Postfix TLS configuration and operation
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153 The Secure Mailer license must be distributed with this software.
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156 Lutz Jaenicke
157 BTU Cottbus
158 Allgemeine Elektrotechnik
159 Universitaetsplatz 3-4
160 D-03044 Cottbus, Germany
161 Adapted by:
163 Wietse Venema
164 IBM T.J. Watson Research
165 P.O. Box 704
166 Yorktown Heights, NY 10598, USA
167 TLSMGR(8)