218 lines
14 KiB
HTML
218 lines
14 KiB
HTML
<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN"
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"http://www.w3.org/TR/html4/loose.dtd">
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<html> <head>
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<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
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<title> Postfix manual - tlsproxy(8) </title>
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</head> <body> <pre>
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TLSPROXY(8) TLSPROXY(8)
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<b>NAME</b>
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tlsproxy - Postfix TLS proxy
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<b>SYNOPSIS</b>
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<b>tlsproxy</b> [generic Postfix daemon options]
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<b>DESCRIPTION</b>
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The <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server implements a server-side TLS proxy. It is used
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by <a href="postscreen.8.html"><b>postscreen</b>(8)</a> to talk SMTP-over-TLS with remote SMTP clients that
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are not whitelisted (including clients whose whitelist status has
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expired), but it should also work for non-SMTP protocols.
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Although one <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> process can serve multiple sessions at the
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same time, it is a good idea to allow the number of processes to
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increase with load, so that the service remains responsive.
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<b>PROTOCOL EXAMPLE</b>
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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>
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server is agnostic of the application protocol, and the example is eas-
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ily adapted to other applications.
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After receiving a valid remote SMTP client STARTTLS command, the
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<a href="postscreen.8.html"><b>postscreen</b>(8)</a> server sends the remote SMTP client endpoint string, the
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requested role (server), and the requested timeout to <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a>.
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<a href="postscreen.8.html"><b>postscreen</b>(8)</a> then receives a "TLS available" indication from
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<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
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remote SMTP client file descriptor to <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a>, and sends the plain-
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text 220 greeting to the remote SMTP client. This triggers TLS negoti-
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ations between the remote SMTP client and <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a>. Upon completion
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of the TLS-level handshake, <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> translates between plaintext
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from/to <a href="postscreen.8.html"><b>postscreen</b>(8)</a> and ciphertext to/from the remote SMTP client.
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<b>SECURITY</b>
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The <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server is moderately security-sensitive. It talks to
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untrusted clients on the network. The process can be run chrooted at
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fixed low privilege.
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<b>DIAGNOSTICS</b>
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Problems and transactions are logged to <b>syslogd</b>(8).
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<b>CONFIGURATION PARAMETERS</b>
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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-
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cesses may run for a long time depending on mail server load. Use the
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command "<b>postfix reload</b>" to speed up a change.
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The text below provides only a parameter summary. See <a href="postconf.5.html"><b>postconf</b>(5)</a> for
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more details including examples.
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<b>STARTTLS SUPPORT CONTROLS</b>
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<b><a href="postconf.5.html#tlsproxy_tls_CAfile">tlsproxy_tls_CAfile</a> ($<a href="postconf.5.html#smtpd_tls_CAfile">smtpd_tls_CAfile</a>)</b>
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A file containing (PEM format) CA certificates of root CAs
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trusted to sign either remote SMTP client certificates or inter-
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mediate CA certificates.
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<b><a href="postconf.5.html#tlsproxy_tls_CApath">tlsproxy_tls_CApath</a> ($<a href="postconf.5.html#smtpd_tls_CApath">smtpd_tls_CApath</a>)</b>
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A directory containing (PEM format) CA certificates of root CAs
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trusted to sign either remote SMTP client certificates or inter-
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mediate CA certificates.
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<b><a href="postconf.5.html#tlsproxy_tls_always_issue_session_ids">tlsproxy_tls_always_issue_session_ids</a> ($<a href="postconf.5.html#smtpd_tls_always_issue_session_ids">smtpd_tls_always_issue_ses</a>-</b>
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<b><a href="postconf.5.html#smtpd_tls_always_issue_session_ids">sion_ids</a>)</b>
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Force the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server to issue a TLS session id,
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even when TLS session caching is turned off.
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<b><a href="postconf.5.html#tlsproxy_tls_ask_ccert">tlsproxy_tls_ask_ccert</a> ($<a href="postconf.5.html#smtpd_tls_ask_ccert">smtpd_tls_ask_ccert</a>)</b>
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Ask a remote SMTP client for a client certificate.
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<b><a href="postconf.5.html#tlsproxy_tls_ccert_verifydepth">tlsproxy_tls_ccert_verifydepth</a> ($<a href="postconf.5.html#smtpd_tls_ccert_verifydepth">smtpd_tls_ccert_verifydepth</a>)</b>
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The verification depth for remote SMTP client certificates.
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<b><a href="postconf.5.html#tlsproxy_tls_cert_file">tlsproxy_tls_cert_file</a> ($<a href="postconf.5.html#smtpd_tls_cert_file">smtpd_tls_cert_file</a>)</b>
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File with the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server RSA certificate in PEM
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format.
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<b><a href="postconf.5.html#tlsproxy_tls_ciphers">tlsproxy_tls_ciphers</a> ($<a href="postconf.5.html#smtpd_tls_ciphers">smtpd_tls_ciphers</a>)</b>
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The minimum TLS cipher grade that the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server
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will use with opportunistic TLS encryption.
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<b><a href="postconf.5.html#tlsproxy_tls_dcert_file">tlsproxy_tls_dcert_file</a> ($<a href="postconf.5.html#smtpd_tls_dcert_file">smtpd_tls_dcert_file</a>)</b>
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File with the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server DSA certificate in PEM
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format.
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<b><a href="postconf.5.html#tlsproxy_tls_dh1024_param_file">tlsproxy_tls_dh1024_param_file</a> ($<a href="postconf.5.html#smtpd_tls_dh1024_param_file">smtpd_tls_dh1024_param_file</a>)</b>
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File with DH parameters that the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server
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should use with non-export EDH ciphers.
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<b><a href="postconf.5.html#tlsproxy_tls_dh512_param_file">tlsproxy_tls_dh512_param_file</a> ($<a href="postconf.5.html#smtpd_tls_dh512_param_file">smtpd_tls_dh512_param_file</a>)</b>
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File with DH parameters that the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server
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should use with export-grade EDH ciphers.
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<b><a href="postconf.5.html#tlsproxy_tls_dkey_file">tlsproxy_tls_dkey_file</a> ($<a href="postconf.5.html#smtpd_tls_dkey_file">smtpd_tls_dkey_file</a>)</b>
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File with the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server DSA private key in PEM
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format.
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<b><a href="postconf.5.html#tlsproxy_tls_eccert_file">tlsproxy_tls_eccert_file</a> ($<a href="postconf.5.html#smtpd_tls_eccert_file">smtpd_tls_eccert_file</a>)</b>
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File with the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server ECDSA certificate in
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PEM format.
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<b><a href="postconf.5.html#tlsproxy_tls_eckey_file">tlsproxy_tls_eckey_file</a> ($<a href="postconf.5.html#smtpd_tls_eckey_file">smtpd_tls_eckey_file</a>)</b>
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File with the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server ECDSA private key in
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PEM format.
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<b><a href="postconf.5.html#tlsproxy_tls_eecdh_grade">tlsproxy_tls_eecdh_grade</a> ($<a href="postconf.5.html#smtpd_tls_eecdh_grade">smtpd_tls_eecdh_grade</a>)</b>
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The Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server security grade for ephemeral
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elliptic-curve Diffie-Hellman (EECDH) key exchange.
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<b><a href="postconf.5.html#tlsproxy_tls_exclude_ciphers">tlsproxy_tls_exclude_ciphers</a> ($<a href="postconf.5.html#smtpd_tls_exclude_ciphers">smtpd_tls_exclude_ciphers</a>)</b>
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List of ciphers or cipher types to exclude from the <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a>
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server cipher list at all TLS security levels.
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<b><a href="postconf.5.html#tlsproxy_tls_fingerprint_digest">tlsproxy_tls_fingerprint_digest</a> ($<a href="postconf.5.html#smtpd_tls_fingerprint_digest">smtpd_tls_fingerprint_digest</a>)</b>
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The message digest algorithm to construct remote SMTP client-
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certificate fingerprints.
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<b><a href="postconf.5.html#tlsproxy_tls_key_file">tlsproxy_tls_key_file</a> ($<a href="postconf.5.html#smtpd_tls_key_file">smtpd_tls_key_file</a>)</b>
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File with the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server RSA private key in PEM
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format.
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<b><a href="postconf.5.html#tlsproxy_tls_loglevel">tlsproxy_tls_loglevel</a> ($<a href="postconf.5.html#smtpd_tls_loglevel">smtpd_tls_loglevel</a>)</b>
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Enable additional Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server logging of TLS
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activity.
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<b><a href="postconf.5.html#tlsproxy_tls_mandatory_ciphers">tlsproxy_tls_mandatory_ciphers</a> ($<a href="postconf.5.html#smtpd_tls_mandatory_ciphers">smtpd_tls_mandatory_ciphers</a>)</b>
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The minimum TLS cipher grade that the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server
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will use with mandatory TLS encryption.
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<b><a href="postconf.5.html#tlsproxy_tls_mandatory_exclude_ciphers">tlsproxy_tls_mandatory_exclude_ciphers</a> ($<a href="postconf.5.html#smtpd_tls_mandatory_exclude_ciphers">smtpd_tls_manda</a>-</b>
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<b><a href="postconf.5.html#smtpd_tls_mandatory_exclude_ciphers">tory_exclude_ciphers</a>)</b>
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Additional list of ciphers or cipher types to exclude from the
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<a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server cipher list at mandatory TLS security levels.
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<b><a href="postconf.5.html#tlsproxy_tls_mandatory_protocols">tlsproxy_tls_mandatory_protocols</a> ($<a href="postconf.5.html#smtpd_tls_mandatory_protocols">smtpd_tls_mandatory_protocols</a>)</b>
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The SSL/TLS protocols accepted by the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server
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with mandatory TLS encryption.
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<b><a href="postconf.5.html#tlsproxy_tls_protocols">tlsproxy_tls_protocols</a> ($<a href="postconf.5.html#smtpd_tls_protocols">smtpd_tls_protocols</a>)</b>
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List of TLS protocols that the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server will
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exclude or include with opportunistic TLS encryption.
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<b><a href="postconf.5.html#tlsproxy_tls_req_ccert">tlsproxy_tls_req_ccert</a> ($<a href="postconf.5.html#smtpd_tls_req_ccert">smtpd_tls_req_ccert</a>)</b>
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With mandatory TLS encryption, require a trusted remote SMTP
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client certificate in order to allow TLS connections to proceed.
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<b><a href="postconf.5.html#tlsproxy_tls_security_level">tlsproxy_tls_security_level</a> ($<a href="postconf.5.html#smtpd_tls_security_level">smtpd_tls_security_level</a>)</b>
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The SMTP TLS security level for the Postfix <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> server;
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when a non-empty value is specified, this overrides the obsolete
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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>.
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Available in Postfix version 2.11 and later:
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<b><a href="postconf.5.html#tlsmgr_service_name">tlsmgr_service_name</a> (tlsmgr)</b>
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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>.
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<b>OBSOLETE STARTTLS SUPPORT CONTROLS</b>
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These parameters are supported for compatibility with <a href="smtpd.8.html"><b>smtpd</b>(8)</a> legacy
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parameters.
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<b><a href="postconf.5.html#tlsproxy_use_tls">tlsproxy_use_tls</a> ($<a href="postconf.5.html#smtpd_use_tls">smtpd_use_tls</a>)</b>
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Opportunistic TLS: announce STARTTLS support to remote SMTP
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clients, but do not require that clients use TLS encryption.
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<b><a href="postconf.5.html#tlsproxy_enforce_tls">tlsproxy_enforce_tls</a> ($<a href="postconf.5.html#smtpd_enforce_tls">smtpd_enforce_tls</a>)</b>
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Mandatory TLS: announce STARTTLS support to remote SMTP clients,
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and require that clients use TLS encryption.
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<b>RESOURCE CONTROLS</b>
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<b><a href="postconf.5.html#tlsproxy_watchdog_timeout">tlsproxy_watchdog_timeout</a> (10s)</b>
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How much time a <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> process may take to process local or
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remote I/O before it is terminated by a built-in watchdog timer.
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<b>MISCELLANEOUS CONTROLS</b>
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<b><a href="postconf.5.html#config_directory">config_directory</a> (see 'postconf -d' output)</b>
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The default location of the Postfix <a href="postconf.5.html">main.cf</a> and <a href="master.5.html">master.cf</a> con-
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figuration files.
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<b><a href="postconf.5.html#process_id">process_id</a> (read-only)</b>
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The process ID of a Postfix command or daemon process.
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<b><a href="postconf.5.html#process_name">process_name</a> (read-only)</b>
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The process name of a Postfix command or daemon process.
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<b><a href="postconf.5.html#syslog_facility">syslog_facility</a> (mail)</b>
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The syslog facility of Postfix logging.
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<b><a href="postconf.5.html#syslog_name">syslog_name</a> (see 'postconf -d' output)</b>
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The mail system name that is prepended to the process name in
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syslog records, so that "smtpd" becomes, for example, "post-
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fix/smtpd".
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<b>SEE ALSO</b>
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<a href="postscreen.8.html">postscreen(8)</a>, Postfix zombie blocker
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<a href="smtpd.8.html">smtpd(8)</a>, Postfix SMTP server
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<a href="postconf.5.html">postconf(5)</a>, configuration parameters
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syslogd(5), system logging
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<b>LICENSE</b>
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The Secure Mailer license must be distributed with this software.
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<b>HISTORY</b>
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This service was introduced with Postfix version 2.8.
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<b>AUTHOR(S)</b>
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Wietse Venema
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IBM T.J. Watson Research
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P.O. Box 704
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Yorktown Heights, NY 10598, USA
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TLSPROXY(8)
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</pre> </body> </html>
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