1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
|
<!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=utf-8">
<link rel='stylesheet' type='text/css' href='postfix-doc.css'>
<title> Postfix manual - tlsproxy(8) </title>
</head> <body> <pre>
TLSPROXY(8) TLSPROXY(8)
<b>NAME</b>
tlsproxy - Postfix TLS proxy
<b>SYNOPSIS</b>
<b>tlsproxy</b> [generic Postfix daemon options]
<b>DESCRIPTION</b>
The <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server implements a two-way TLS proxy. It is used by
the <a href="postscreen.8.html"><b>postscreen</b>(8)</a> server to talk SMTP-over-TLS with remote SMTP clients
that are not allowlisted (including clients whose allowlist status has
expired), and by the <a href="smtp.8.html"><b>smtp</b>(8)</a> client to support TLS connection reuse,
but it should also work for non-SMTP protocols.
Although one <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> process can serve multiple sessions at the
same time, it is a good idea to allow the number of processes to
increase with load, so that the service remains responsive.
<b>PROTOCOL EXAMPLE</b>
The example below concerns <a href="postscreen.8.html"><b>postscreen</b>(8)</a>. However, the <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a>
server is agnostic of the application protocol, and the example is eas-
ily adapted to other applications.
After receiving a valid remote SMTP client STARTTLS command, the
<a href="postscreen.8.html"><b>postscreen</b>(8)</a> server sends the remote SMTP client endpoint string, the
requested role (server), and the requested timeout to <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a>.
<a href="postscreen.8.html"><b>postscreen</b>(8)</a> then receives a "TLS available" indication from
<a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a>. If the TLS service is available, <a href="postscreen.8.html"><b>postscreen</b>(8)</a> sends the
remote SMTP client file descriptor to <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a>, and sends the plain-
text 220 greeting to the remote SMTP client. This triggers TLS negoti-
ations between the remote SMTP client and <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a>. Upon completion
of the TLS-level handshake, <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> translates between plaintext
from/to <a href="postscreen.8.html"><b>postscreen</b>(8)</a> and ciphertext to/from the remote SMTP client.
<b>SECURITY</b>
The <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server is moderately security-sensitive. It talks to
untrusted clients on the network. The process can be run chrooted at
fixed low privilege.
<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>CONFIGURATION PARAMETERS</b>
Changes to <a href="postconf.5.html"><b>main.cf</b></a> are not picked up automatically, as <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> pro-
cesses may run for a long time depending on mail server load. Use the
command "<b>postfix reload</b>" to speed up a 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>STARTTLS GLOBAL CONTROLS</b>
The following settings are global and therefore cannot be overruled by
information specified in a <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> client request.
<b><a href="postconf.5.html#tls_append_default_CA">tls_append_default_CA</a> (no)</b>
Append the system-supplied default Certification Authority cer-
tificates to the ones specified with *_tls_CApath or
*_tls_CAfile.
<b><a href="postconf.5.html#tls_daemon_random_bytes">tls_daemon_random_bytes</a> (32)</b>
The number of pseudo-random bytes that an <a href="smtp.8.html"><b>smtp</b>(8)</a> or <a href="smtpd.8.html"><b>smtpd</b>(8)</a>
process requests from the <a href="tlsmgr.8.html"><b>tlsmgr</b>(8)</a> server in order to seed its
internal pseudo random number generator (PRNG).
<b><a href="postconf.5.html#tls_high_cipherlist">tls_high_cipherlist</a> (see 'postconf -d' output)</b>
The OpenSSL cipherlist for "high" grade ciphers.
<b><a href="postconf.5.html#tls_medium_cipherlist">tls_medium_cipherlist</a> (see 'postconf -d' output)</b>
The OpenSSL cipherlist for "medium" or higher grade ciphers.
<b><a href="postconf.5.html#tls_null_cipherlist">tls_null_cipherlist</a> (eNULL:!aNULL)</b>
The OpenSSL cipherlist for "NULL" grade ciphers that provide
authentication without encryption.
<b><a href="postconf.5.html#tls_eecdh_strong_curve">tls_eecdh_strong_curve</a> (prime256v1)</b>
The elliptic curve used by the Postfix SMTP server for sensibly
strong ephemeral ECDH key exchange.
<b><a href="postconf.5.html#tls_eecdh_ultra_curve">tls_eecdh_ultra_curve</a> (secp384r1)</b>
The elliptic curve used by the Postfix SMTP server for maximally
strong ephemeral ECDH key exchange.
<b><a href="postconf.5.html#tls_disable_workarounds">tls_disable_workarounds</a> (see 'postconf -d' output)</b>
List or bit-mask of OpenSSL bug work-arounds to disable.
<b><a href="postconf.5.html#tls_preempt_cipherlist">tls_preempt_cipherlist</a> (no)</b>
With SSLv3 and later, use the Postfix SMTP server's cipher pref-
erence order instead of the remote client's cipher preference
order.
Available in Postfix version 2.8..3.7:
<b><a href="postconf.5.html#tls_low_cipherlist">tls_low_cipherlist</a> (see 'postconf -d' output)</b>
The OpenSSL cipherlist for "low" or higher grade ciphers.
<b><a href="postconf.5.html#tls_export_cipherlist">tls_export_cipherlist</a> (see 'postconf -d' output)</b>
The OpenSSL cipherlist for "export" or higher grade ciphers.
Available in Postfix version 2.9 and later:
<b><a href="postconf.5.html#tls_legacy_public_key_fingerprints">tls_legacy_public_key_fingerprints</a> (no)</b>
A temporary migration aid for sites that use certificate <i>pub-</i>
<i>lic-key</i> fingerprints with Postfix 2.9.0..2.9.5, which use an
incorrect algorithm.
Available in Postfix version 2.11-3.1:
<b><a href="postconf.5.html#tls_dane_digest_agility">tls_dane_digest_agility</a> (on)</b>
Configure <a href="https://tools.ietf.org/html/rfc7671">RFC7671</a> DANE TLSA digest algorithm agility.
<b><a href="postconf.5.html#tls_dane_trust_anchor_digest_enable">tls_dane_trust_anchor_digest_enable</a> (yes)</b>
Enable support for <a href="https://tools.ietf.org/html/rfc6698">RFC 6698</a> (DANE TLSA) DNS records that contain
digests of trust-anchors with certificate usage "2".
Available in Postfix version 2.11 and later:
<b><a href="postconf.5.html#tlsmgr_service_name">tlsmgr_service_name</a> (tlsmgr)</b>
The name of the <a href="tlsmgr.8.html"><b>tlsmgr</b>(8)</a> service entry in <a href="master.5.html">master.cf</a>.
Available in Postfix version 3.0 and later:
<b><a href="postconf.5.html#tls_session_ticket_cipher">tls_session_ticket_cipher</a> (Postfix</b> ><b>= 3.0: aes-256-cbc, Postfix</b> < <b>3.0:</b>
<b>aes-128-cbc)</b>
Algorithm used to encrypt <a href="https://tools.ietf.org/html/rfc5077">RFC5077</a> TLS session tickets.
<b><a href="postconf.5.html#openssl_path">openssl_path</a> (openssl)</b>
The location of the OpenSSL command line program <b>openssl</b>(1).
Available in Postfix version 3.2 and later:
<b><a href="postconf.5.html#tls_eecdh_auto_curves">tls_eecdh_auto_curves</a> (see 'postconf -d' output)</b>
The prioritized list of elliptic curves supported by the Postfix
SMTP client and server.
Available in Postfix version 3.4 and later:
<b><a href="postconf.5.html#tls_server_sni_maps">tls_server_sni_maps</a> (empty)</b>
Optional lookup tables that map names received from remote SMTP
clients via the TLS Server Name Indication (SNI) extension to
the appropriate keys and certificate chains.
Available in Postfix 3.5, 3.4.6, 3.3.5, 3.2.10, 3.1.13 and later:
<b><a href="postconf.5.html#tls_fast_shutdown_enable">tls_fast_shutdown_enable</a> (yes)</b>
A workaround for implementations that hang Postfix while shut-
ting down a TLS session, until Postfix times out.
Available in Postfix version 3.8 and later:
<b><a href="postconf.5.html#tls_ffdhe_auto_groups">tls_ffdhe_auto_groups</a> (see 'postconf -d' output)</b>
The prioritized list of finite-field Diffie-Hellman ephemeral
(FFDHE) key exchange groups supported by the Postfix SMTP client
and server.
Available in Postfix 3.9, 3.8.1, 3.7.6, 3.6.10, 3.5.20 and later:
<b><a href="postconf.5.html#tls_config_file">tls_config_file</a> (default)</b>
Optional configuration file with baseline OpenSSL settings.
<b><a href="postconf.5.html#tls_config_name">tls_config_name</a> (empty)</b>
The application name passed by Postfix to OpenSSL library ini-
tialization functions.
<b>STARTTLS SERVER CONTROLS</b>
These settings are clones of Postfix SMTP server settings. They allow
<a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> to load the same certificate and private key information as
the Postfix SMTP server, before dropping privileges, so that the key
files can be kept read-only for root. These settings can currently not
be overruled by information in a <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> client request, but that
limitation may be removed in a future version.
<b><a href="postconf.5.html#tlsproxy_tls_CAfile">tlsproxy_tls_CAfile</a> ($<a href="postconf.5.html#smtpd_tls_CAfile">smtpd_tls_CAfile</a>)</b>
A file containing (PEM format) CA certificates of root CAs
trusted to sign either remote SMTP client certificates or inter-
mediate CA certificates.
<b><a href="postconf.5.html#tlsproxy_tls_CApath">tlsproxy_tls_CApath</a> ($<a href="postconf.5.html#smtpd_tls_CApath">smtpd_tls_CApath</a>)</b>
A directory containing (PEM format) CA certificates of root CAs
trusted to sign either remote SMTP client certificates or inter-
mediate CA certificates.
<b><a href="postconf.5.html#tlsproxy_tls_always_issue_session_ids">tlsproxy_tls_always_issue_session_ids</a> ($<a href="postconf.5.html#smtpd_tls_always_issue_session_ids">smtpd_tls_always_issue_ses</a>-</b>
<b><a href="postconf.5.html#smtpd_tls_always_issue_session_ids">sion_ids</a>)</b>
Force the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server to issue a TLS session id,
even when TLS session caching is turned off.
<b><a href="postconf.5.html#tlsproxy_tls_ask_ccert">tlsproxy_tls_ask_ccert</a> ($<a href="postconf.5.html#smtpd_tls_ask_ccert">smtpd_tls_ask_ccert</a>)</b>
Ask a remote SMTP client for a client certificate.
<b><a href="postconf.5.html#tlsproxy_tls_ccert_verifydepth">tlsproxy_tls_ccert_verifydepth</a> ($<a href="postconf.5.html#smtpd_tls_ccert_verifydepth">smtpd_tls_ccert_verifydepth</a>)</b>
The verification depth for remote SMTP client certificates.
<b><a href="postconf.5.html#tlsproxy_tls_cert_file">tlsproxy_tls_cert_file</a> ($<a href="postconf.5.html#smtpd_tls_cert_file">smtpd_tls_cert_file</a>)</b>
File with the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server RSA certificate in PEM
format.
<b><a href="postconf.5.html#tlsproxy_tls_ciphers">tlsproxy_tls_ciphers</a> ($<a href="postconf.5.html#smtpd_tls_ciphers">smtpd_tls_ciphers</a>)</b>
The minimum TLS cipher grade that the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server
will use with opportunistic TLS encryption.
<b><a href="postconf.5.html#tlsproxy_tls_dcert_file">tlsproxy_tls_dcert_file</a> ($<a href="postconf.5.html#smtpd_tls_dcert_file">smtpd_tls_dcert_file</a>)</b>
File with the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server DSA certificate in PEM
format.
<b><a href="postconf.5.html#tlsproxy_tls_dh1024_param_file">tlsproxy_tls_dh1024_param_file</a> ($<a href="postconf.5.html#smtpd_tls_dh1024_param_file">smtpd_tls_dh1024_param_file</a>)</b>
File with DH parameters that the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server
should use with non-export EDH ciphers.
<b><a href="postconf.5.html#tlsproxy_tls_dh512_param_file">tlsproxy_tls_dh512_param_file</a> ($<a href="postconf.5.html#smtpd_tls_dh512_param_file">smtpd_tls_dh512_param_file</a>)</b>
File with DH parameters that the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server
should use with export-grade EDH ciphers.
<b><a href="postconf.5.html#tlsproxy_tls_dkey_file">tlsproxy_tls_dkey_file</a> ($<a href="postconf.5.html#smtpd_tls_dkey_file">smtpd_tls_dkey_file</a>)</b>
File with the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server DSA private key in PEM
format.
<b><a href="postconf.5.html#tlsproxy_tls_eccert_file">tlsproxy_tls_eccert_file</a> ($<a href="postconf.5.html#smtpd_tls_eccert_file">smtpd_tls_eccert_file</a>)</b>
File with the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server ECDSA certificate in
PEM format.
<b><a href="postconf.5.html#tlsproxy_tls_eckey_file">tlsproxy_tls_eckey_file</a> ($<a href="postconf.5.html#smtpd_tls_eckey_file">smtpd_tls_eckey_file</a>)</b>
File with the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server ECDSA private key in
PEM format.
<b><a href="postconf.5.html#tlsproxy_tls_eecdh_grade">tlsproxy_tls_eecdh_grade</a> ($<a href="postconf.5.html#smtpd_tls_eecdh_grade">smtpd_tls_eecdh_grade</a>)</b>
The Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server security grade for ephemeral
elliptic-curve Diffie-Hellman (EECDH) key exchange.
<b><a href="postconf.5.html#tlsproxy_tls_exclude_ciphers">tlsproxy_tls_exclude_ciphers</a> ($<a href="postconf.5.html#smtpd_tls_exclude_ciphers">smtpd_tls_exclude_ciphers</a>)</b>
List of ciphers or cipher types to exclude from the <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a>
server cipher list at all TLS security levels.
<b><a href="postconf.5.html#tlsproxy_tls_fingerprint_digest">tlsproxy_tls_fingerprint_digest</a> ($<a href="postconf.5.html#smtpd_tls_fingerprint_digest">smtpd_tls_fingerprint_digest</a>)</b>
The message digest algorithm to construct remote SMTP
client-certificate fingerprints.
<b><a href="postconf.5.html#tlsproxy_tls_key_file">tlsproxy_tls_key_file</a> ($<a href="postconf.5.html#smtpd_tls_key_file">smtpd_tls_key_file</a>)</b>
File with the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server RSA private key in PEM
format.
<b><a href="postconf.5.html#tlsproxy_tls_loglevel">tlsproxy_tls_loglevel</a> ($<a href="postconf.5.html#smtpd_tls_loglevel">smtpd_tls_loglevel</a>)</b>
Enable additional Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server logging of TLS
activity.
<b><a href="postconf.5.html#tlsproxy_tls_mandatory_ciphers">tlsproxy_tls_mandatory_ciphers</a> ($<a href="postconf.5.html#smtpd_tls_mandatory_ciphers">smtpd_tls_mandatory_ciphers</a>)</b>
The minimum TLS cipher grade that the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server
will use with mandatory TLS encryption.
<b><a href="postconf.5.html#tlsproxy_tls_mandatory_exclude_ciphers">tlsproxy_tls_mandatory_exclude_ciphers</a> ($<a href="postconf.5.html#smtpd_tls_mandatory_exclude_ciphers">smtpd_tls_manda</a>-</b>
<b><a href="postconf.5.html#smtpd_tls_mandatory_exclude_ciphers">tory_exclude_ciphers</a>)</b>
Additional list of ciphers or cipher types to exclude from the
<a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server cipher list at mandatory TLS security levels.
<b><a href="postconf.5.html#tlsproxy_tls_mandatory_protocols">tlsproxy_tls_mandatory_protocols</a> ($<a href="postconf.5.html#smtpd_tls_mandatory_protocols">smtpd_tls_mandatory_protocols</a>)</b>
The SSL/TLS protocols accepted by the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server
with mandatory TLS encryption.
<b><a href="postconf.5.html#tlsproxy_tls_protocols">tlsproxy_tls_protocols</a> ($<a href="postconf.5.html#smtpd_tls_protocols">smtpd_tls_protocols</a>)</b>
List of TLS protocols that the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server will
exclude or include with opportunistic TLS encryption.
<b><a href="postconf.5.html#tlsproxy_tls_req_ccert">tlsproxy_tls_req_ccert</a> ($<a href="postconf.5.html#smtpd_tls_req_ccert">smtpd_tls_req_ccert</a>)</b>
With mandatory TLS encryption, require a trusted remote SMTP
client certificate in order to allow TLS connections to proceed.
<b><a href="postconf.5.html#tlsproxy_tls_security_level">tlsproxy_tls_security_level</a> ($<a href="postconf.5.html#smtpd_tls_security_level">smtpd_tls_security_level</a>)</b>
The SMTP TLS security level for the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server;
when a non-empty value is specified, this overrides the obsolete
parameters <a href="postconf.5.html#smtpd_use_tls">smtpd_use_tls</a> and <a href="postconf.5.html#smtpd_enforce_tls">smtpd_enforce_tls</a>.
<b><a href="postconf.5.html#tlsproxy_tls_chain_files">tlsproxy_tls_chain_files</a> ($<a href="postconf.5.html#smtpd_tls_chain_files">smtpd_tls_chain_files</a>)</b>
Files with the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server keys and certificate
chains in PEM format.
Available in Postfix version 3.9 and later:
<b><a href="postconf.5.html#tlsproxy_tls_enable_rpk">tlsproxy_tls_enable_rpk</a> ($<a href="postconf.5.html#smtpd_tls_enable_rpk">smtpd_tls_enable_rpk</a>)</b>
Request that remote SMTP clients send an <a href="https://tools.ietf.org/html/rfc7250">RFC7250</a> raw public key
instead of an X.509 certificate, when asking or requiring client
authentication.
<b>STARTTLS CLIENT CONTROLS</b>
These settings are clones of Postfix SMTP client settings. They allow
<a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> to load the same certificate and private key information as
the Postfix SMTP client, before dropping privileges, so that the key
files can be kept read-only for root. Some settings may be overruled by
information in a <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> client request.
Available in Postfix version 3.4 and later:
<b><a href="postconf.5.html#tlsproxy_client_CAfile">tlsproxy_client_CAfile</a> ($<a href="postconf.5.html#smtp_tls_CAfile">smtp_tls_CAfile</a>)</b>
A file containing CA certificates of root CAs trusted to sign
either remote TLS server certificates or intermediate CA cer-
tificates.
<b><a href="postconf.5.html#tlsproxy_client_CApath">tlsproxy_client_CApath</a> ($<a href="postconf.5.html#smtp_tls_CApath">smtp_tls_CApath</a>)</b>
Directory with PEM format Certification Authority certificates
that the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> client uses to verify a remote TLS
server certificate.
<b><a href="postconf.5.html#tlsproxy_client_chain_files">tlsproxy_client_chain_files</a> ($<a href="postconf.5.html#smtp_tls_chain_files">smtp_tls_chain_files</a>)</b>
Files with the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> client keys and certificate
chains in PEM format.
<b><a href="postconf.5.html#tlsproxy_client_cert_file">tlsproxy_client_cert_file</a> ($<a href="postconf.5.html#smtp_tls_cert_file">smtp_tls_cert_file</a>)</b>
File with the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> client RSA certificate in PEM
format.
<b><a href="postconf.5.html#tlsproxy_client_key_file">tlsproxy_client_key_file</a> ($<a href="postconf.5.html#smtp_tls_key_file">smtp_tls_key_file</a>)</b>
File with the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> client RSA private key in PEM
format.
<b><a href="postconf.5.html#tlsproxy_client_dcert_file">tlsproxy_client_dcert_file</a> ($<a href="postconf.5.html#smtp_tls_dcert_file">smtp_tls_dcert_file</a>)</b>
File with the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> client DSA certificate in PEM
format.
<b><a href="postconf.5.html#tlsproxy_client_dkey_file">tlsproxy_client_dkey_file</a> ($<a href="postconf.5.html#smtp_tls_dkey_file">smtp_tls_dkey_file</a>)</b>
File with the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> client DSA private key in PEM
format.
<b><a href="postconf.5.html#tlsproxy_client_eccert_file">tlsproxy_client_eccert_file</a> ($<a href="postconf.5.html#smtp_tls_eccert_file">smtp_tls_eccert_file</a>)</b>
File with the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> client ECDSA certificate in
PEM format.
<b><a href="postconf.5.html#tlsproxy_client_eckey_file">tlsproxy_client_eckey_file</a> ($<a href="postconf.5.html#smtp_tls_eckey_file">smtp_tls_eckey_file</a>)</b>
File with the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> client ECDSA private key in
PEM format.
<b><a href="postconf.5.html#tlsproxy_client_fingerprint_digest">tlsproxy_client_fingerprint_digest</a> ($<a href="postconf.5.html#smtp_tls_fingerprint_digest">smtp_tls_fingerprint_digest</a>)</b>
The message digest algorithm used to construct remote TLS server
certificate fingerprints.
<b><a href="postconf.5.html#tlsproxy_client_loglevel">tlsproxy_client_loglevel</a> ($<a href="postconf.5.html#smtp_tls_loglevel">smtp_tls_loglevel</a>)</b>
Enable additional Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> client logging of TLS
activity.
<b><a href="postconf.5.html#tlsproxy_client_loglevel_parameter">tlsproxy_client_loglevel_parameter</a> (<a href="postconf.5.html#smtp_tls_loglevel">smtp_tls_loglevel</a>)</b>
The name of the parameter that provides the
<a href="postconf.5.html#tlsproxy_client_loglevel">tlsproxy_client_loglevel</a> value.
<b><a href="postconf.5.html#tlsproxy_client_scert_verifydepth">tlsproxy_client_scert_verifydepth</a> ($<a href="postconf.5.html#smtp_tls_scert_verifydepth">smtp_tls_scert_verifydepth</a>)</b>
The verification depth for remote TLS server certificates.
<b><a href="postconf.5.html#tlsproxy_client_use_tls">tlsproxy_client_use_tls</a> ($<a href="postconf.5.html#smtp_use_tls">smtp_use_tls</a>)</b>
Opportunistic mode: use TLS when a remote server announces TLS
support.
<b><a href="postconf.5.html#tlsproxy_client_enforce_tls">tlsproxy_client_enforce_tls</a> ($<a href="postconf.5.html#smtp_enforce_tls">smtp_enforce_tls</a>)</b>
Enforcement mode: require that SMTP servers use TLS encryption.
<b><a href="postconf.5.html#tlsproxy_client_per_site">tlsproxy_client_per_site</a> ($<a href="postconf.5.html#smtp_tls_per_site">smtp_tls_per_site</a>)</b>
Optional lookup tables with the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> client TLS
usage policy by next-hop destination and by remote TLS server
hostname.
Available in Postfix version 3.4-3.6:
<b><a href="postconf.5.html#tlsproxy_client_level">tlsproxy_client_level</a> ($<a href="postconf.5.html#smtp_tls_security_level">smtp_tls_security_level</a>)</b>
The default TLS security level for the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a>
client.
<b><a href="postconf.5.html#tlsproxy_client_policy">tlsproxy_client_policy</a> ($<a href="postconf.5.html#smtp_tls_policy_maps">smtp_tls_policy_maps</a>)</b>
Optional lookup tables with the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> client TLS
security policy by next-hop destination.
Available in Postfix version 3.7 and later:
<b><a href="postconf.5.html#tlsproxy_client_security_level">tlsproxy_client_security_level</a> ($<a href="postconf.5.html#smtp_tls_security_level">smtp_tls_security_level</a>)</b>
The default TLS security level for the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a>
client.
<b><a href="postconf.5.html#tlsproxy_client_policy_maps">tlsproxy_client_policy_maps</a> ($<a href="postconf.5.html#smtp_tls_policy_maps">smtp_tls_policy_maps</a>)</b>
Optional lookup tables with the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> client TLS
security policy by next-hop destination.
<b>OBSOLETE STARTTLS SUPPORT CONTROLS</b>
These parameters are supported for compatibility with <a href="smtpd.8.html"><b>smtpd</b>(8)</a> legacy
parameters.
<b><a href="postconf.5.html#tlsproxy_use_tls">tlsproxy_use_tls</a> ($<a href="postconf.5.html#smtpd_use_tls">smtpd_use_tls</a>)</b>
Opportunistic TLS: announce STARTTLS support to remote SMTP
clients, but do not require that clients use TLS encryption.
<b><a href="postconf.5.html#tlsproxy_enforce_tls">tlsproxy_enforce_tls</a> ($<a href="postconf.5.html#smtpd_enforce_tls">smtpd_enforce_tls</a>)</b>
Mandatory TLS: announce STARTTLS support to remote SMTP clients,
and require that clients use TLS encryption.
<b><a href="postconf.5.html#tlsproxy_client_use_tls">tlsproxy_client_use_tls</a> ($<a href="postconf.5.html#smtp_use_tls">smtp_use_tls</a>)</b>
Opportunistic mode: use TLS when a remote server announces TLS
support.
<b><a href="postconf.5.html#tlsproxy_client_enforce_tls">tlsproxy_client_enforce_tls</a> ($<a href="postconf.5.html#smtp_enforce_tls">smtp_enforce_tls</a>)</b>
Enforcement mode: require that SMTP servers use TLS encryption.
<b>RESOURCE CONTROLS</b>
<b><a href="postconf.5.html#tlsproxy_watchdog_timeout">tlsproxy_watchdog_timeout</a> (10s)</b>
How much time a <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> process may take to process local or
remote I/O before it is terminated by a built-in watchdog timer.
<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#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="postscreen.8.html">postscreen(8)</a>, Postfix zombie blocker
<a href="smtpd.8.html">smtpd(8)</a>, Postfix SMTP server
<a href="postconf.5.html">postconf(5)</a>, configuration parameters
<a href="postlogd.8.html">postlogd(8)</a>, Postfix logging
syslogd(8), system logging
<b>LICENSE</b>
The Secure Mailer license must be distributed with this software.
<b>HISTORY</b>
This service was introduced with Postfix version 2.8.
<b>AUTHOR(S)</b>
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
TLSPROXY(8)
</pre> </body> </html>
|
