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Rename

<!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 - tlsproxy(8) </title>
</head> <body> <pre>
TLSPROXY(8) System Manager's Manual TLSPROXY(8)

NAME
 tlsproxy - Postfix TLS proxy

SYNOPSIS
 tlsproxy [generic Postfix daemon options]

DESCRIPTION
 The <a href="tlsproxy.8.html">tlsproxy(8)</a> server implements a server-side TLS proxy. It is used
 by <a href="postscreen.8.html">postscreen(8)</a> to talk SMTP-over-TLS with remote SMTP clients that
 are not whitelisted (including clients whose whitelist status has
 expired), but it should also work for non-SMTP protocols.

Although one <a href="tlsproxy.8.html">tlsproxy(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.

PROTOCOL EXAMPLE
 The example below concerns <a href="postscreen.8.html">postscreen(8)</a>. However, the <a href="tlsproxy.8.html">tlsproxy(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">postscreen(8)</a> server sends the remote SMTP client endpoint string, the
 requested role (server), and the requested timeout to <a href="tlsproxy.8.html">tlsproxy(8)</a>.
 <a href="postscreen.8.html">postscreen(8)</a> then receives a "TLS available" indication from
 <a href="tlsproxy.8.html">tlsproxy(8)</a>. If the TLS service is available, <a href="postscreen.8.html">postscreen(8)</a> sends the
 remote SMTP client file descriptor to <a href="tlsproxy.8.html">tlsproxy(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">tlsproxy(8)</a>. Upon completion
 of the TLS-level handshake, <a href="tlsproxy.8.html">tlsproxy(8)</a> translates between plaintext
 from/to <a href="postscreen.8.html">postscreen(8)</a> and ciphertext to/from the remote SMTP client.

SECURITY
 The <a href="tlsproxy.8.html">tlsproxy(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.

DIAGNOSTICS
 Problems and transactions are logged to syslogd(8).

CONFIGURATION PARAMETERS
 Changes to <a href="postconf.5.html">main.cf</a> are not picked up automatically, as <a href="tlsproxy.8.html">tlsproxy(8)</a> pro‐
 cesses may run for a long time depending on mail server load. Use the
 command "postfix reload" to speed up a change.

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

STARTTLS SUPPORT CONTROLS
 <a href="postconf.5.html#tlsproxy_tls_CAfile">tlsproxy_tls_CAfile</a> ($<a href="postconf.5.html#smtpd_tls_CAfile">smtpd_tls_CAfile</a>)
 A file containing (PEM format) CA certificates of root CAs
 trusted to sign either remote SMTP client certificates or inter‐
 mediate CA certificates.

<a href="postconf.5.html#tlsproxy_tls_CApath">tlsproxy_tls_CApath</a> ($<a href="postconf.5.html#smtpd_tls_CApath">smtpd_tls_CApath</a>)
 A directory containing (PEM format) CA certificates of root CAs
 trusted to sign either remote SMTP client certificates or inter‐
 mediate CA certificates.

<a href="postconf.5.html#tlsproxy_tls_always_issue_session_ids">tlsproxy_tls_always_issue_session_ids</a> ($smtpd_tls_always_issue_ses‐
 sion_ids)
 Force the Postfix <a href="tlsproxy.8.html">tlsproxy(8)</a> server to issue a TLS session id,
 even when TLS session caching is turned off.

<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>)
 Ask a remote SMTP client for a client certificate.

<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>)
 The verification depth for remote SMTP client certificates.

<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>)
 File with the Postfix <a href="tlsproxy.8.html">tlsproxy(8)</a> server RSA certificate in PEM
 format.

<a href="postconf.5.html#tlsproxy_tls_ciphers">tlsproxy_tls_ciphers</a> ($<a href="postconf.5.html#smtpd_tls_ciphers">smtpd_tls_ciphers</a>)
 The minimum TLS cipher grade that the Postfix <a href="tlsproxy.8.html">tlsproxy(8)</a> server
 will use with opportunistic TLS encryption.

<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>)
 File with the Postfix <a href="tlsproxy.8.html">tlsproxy(8)</a> server DSA certificate in PEM
 format.

<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>)
 File with DH parameters that the Postfix <a href="tlsproxy.8.html">tlsproxy(8)</a> server
 should use with non-export EDH ciphers.

<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>)
 File with DH parameters that the Postfix <a href="tlsproxy.8.html">tlsproxy(8)</a> server
 should use with export-grade EDH ciphers.

<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>)
 File with the Postfix <a href="tlsproxy.8.html">tlsproxy(8)</a> server DSA private key in PEM
 format.

<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>)
 File with the Postfix <a href="tlsproxy.8.html">tlsproxy(8)</a> server ECDSA certificate in
 PEM format.

<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>)
 File with the Postfix <a href="tlsproxy.8.html">tlsproxy(8)</a> server ECDSA private key in
 PEM format.

<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>)
 The Postfix <a href="tlsproxy.8.html">tlsproxy(8)</a> server security grade for ephemeral
 elliptic-curve Diffie-Hellman (EECDH) key exchange.

<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>)
 List of ciphers or cipher types to exclude from the <a href="tlsproxy.8.html">tlsproxy(8)</a>
 server cipher list at all TLS security levels.

<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>)
 The message digest algorithm to construct remote SMTP
 client-certificate fingerprints.

<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>)
 File with the Postfix <a href="tlsproxy.8.html">tlsproxy(8)</a> server RSA private key in PEM
 format.

<a href="postconf.5.html#tlsproxy_tls_loglevel">tlsproxy_tls_loglevel</a> ($<a href="postconf.5.html#smtpd_tls_loglevel">smtpd_tls_loglevel</a>)
 Enable additional Postfix <a href="tlsproxy.8.html">tlsproxy(8)</a> server logging of TLS
 activity.

<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>)
 The minimum TLS cipher grade that the Postfix <a href="tlsproxy.8.html">tlsproxy(8)</a> server
 will use with mandatory TLS encryption.

<a href="postconf.5.html#tlsproxy_tls_mandatory_exclude_ciphers">tlsproxy_tls_mandatory_exclude_ciphers</a> ($smtpd_tls_manda‐
 tory_exclude_ciphers)
 Additional list of ciphers or cipher types to exclude from the
 <a href="tlsproxy.8.html">tlsproxy(8)</a> server cipher list at mandatory TLS security levels.

<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>)
 The SSL/TLS protocols accepted by the Postfix <a href="tlsproxy.8.html">tlsproxy(8)</a> server
 with mandatory TLS encryption.

<a href="postconf.5.html#tlsproxy_tls_protocols">tlsproxy_tls_protocols</a> ($<a href="postconf.5.html#smtpd_tls_protocols">smtpd_tls_protocols</a>)
 List of TLS protocols that the Postfix <a href="tlsproxy.8.html">tlsproxy(8)</a> server will
 exclude or include with opportunistic TLS encryption.

<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>)
 With mandatory TLS encryption, require a trusted remote SMTP
 client certificate in order to allow TLS connections to proceed.

<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>)
 The SMTP TLS security level for the Postfix <a href="tlsproxy.8.html">tlsproxy(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>.

Available in Postfix version 2.11 and later:

<a href="postconf.5.html#tlsmgr_service_name">tlsmgr_service_name</a> (tlsmgr)
 The name of the <a href="tlsmgr.8.html">tlsmgr(8)</a> service entry in <a href="master.5.html">master.cf</a>.

Introduced with Postfix 3.4.6, 3.3.5, 3.2.10, and 3.1.13:

<a href="postconf.5.html#tls_fast_shutdown_enable">tls_fast_shutdown_enable</a> (yes)
 A workaround for implementations that hang Postfix while shuting
 down a TLS session, until Postfix times out.

OBSOLETE STARTTLS SUPPORT CONTROLS
 These parameters are supported for compatibility with <a href="smtpd.8.html">smtpd(8)</a> legacy
 parameters.

<a href="postconf.5.html#tlsproxy_use_tls">tlsproxy_use_tls</a> ($<a href="postconf.5.html#smtpd_use_tls">smtpd_use_tls</a>)
 Opportunistic TLS: announce STARTTLS support to remote SMTP
 clients, but do not require that clients use TLS encryption.

<a href="postconf.5.html#tlsproxy_enforce_tls">tlsproxy_enforce_tls</a> ($<a href="postconf.5.html#smtpd_enforce_tls">smtpd_enforce_tls</a>)
 Mandatory TLS: announce STARTTLS support to remote SMTP clients,
 and require that clients use TLS encryption.

RESOURCE CONTROLS
 <a href="postconf.5.html#tlsproxy_watchdog_timeout">tlsproxy_watchdog_timeout</a> (10s)
 How much time a <a href="tlsproxy.8.html">tlsproxy(8)</a> process may take to process local or
 remote I/O before it is terminated by a built-in watchdog timer.

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#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="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
 syslogd(5), system logging

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

HISTORY
 This service was introduced with Postfix version 2.8.

AUTHOR(S)
 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)
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