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    Command:

    tlsproxy

    
    
    

    SYNOPSIS

           tlsproxy [generic Postfix daemon options]
    
    
    

    DESCRIPTION

           The  tlsproxy(8)  server implements a server-side TLS proxy. It is used
           by postscreen(8) to talk SMTP-over-TLS with remote SMTP  clients  whose
           whitelist status has expired, but it should also work for non-SMTP pro-
           tocols.
    
           Although one tlsproxy(8) 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  postscreen(8).  However,  the  tlsproxy(8)
           server is agnostic of the application protocol, and the example is eas-
           ily adapted to other applications.
    
           The postscreen(8) server sends the remote SMTP client endpoint  string,
           the  requested role (server), and the requested timeout to tlsproxy(8).
           postscreen(8)  then  receives  a  "TLS   available"   indication   from
           tlsproxy(8).   If the TLS service is available, postscreen(8) sends the
           remote SMTP client file descriptor to tlsproxy(8), and sends the plain-
           text 220 greeting to the remote SMTP client.  This triggers TLS negoti-
           ations between the remote SMTP client and tlsproxy(8).  Upon completion
           of  the  TLS-level  handshake, tlsproxy(8) translates between plaintext
           from/to postscreen(8) and ciphertext to/from the remote SMTP client.
    
    
    

    SECURITY

           The tlsproxy(8) 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 main.cf are not picked up automatically, as tlsproxy(8) 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  postconf(5)  for
           more details including examples.
    
    
    

    STARTTLS SUPPORT CONTROLS

           tlsproxy_tls_CAfile ($smtpd_tls_CAfile)
                  A  file  containing  (PEM  format)  CA  certificates of root CAs
                  trusted to sign either remote SMTP client certificates or inter-
                  mediate CA certificates.
    
           tlsproxy_tls_CApath ($smtpd_tls_CApath)
                  A  directory containing (PEM format) CA certificates of root CAs
    
           tlsproxy_tls_cert_file ($smtpd_tls_cert_file)
                  File with the Postfix tlsproxy(8) server RSA certificate in  PEM
                  format.
    
           tlsproxy_tls_ciphers ($smtpd_tls_ciphers)
                  The minimum TLS cipher grade that the Postfix tlsproxy(8) server
                  will use with opportunistic TLS encryption.
    
           tlsproxy_tls_dcert_file ($smtpd_tls_dcert_file)
                  File with the Postfix tlsproxy(8) server DSA certificate in  PEM
                  format.
    
           tlsproxy_tls_dh1024_param_file ($smtpd_tls_dh1024_param_file)
                  File  with  DH  parameters  that  the Postfix tlsproxy(8) server
                  should use with EDH ciphers.
    
           tlsproxy_tls_dh512_param_file ($smtpd_tls_dh512_param_file)
                  File with DH parameters  that  the  Postfix  tlsproxy(8)  server
                  should use with EDH ciphers.
    
           tlsproxy_tls_dkey_file ($smtpd_tls_dkey_file)
                  File  with the Postfix tlsproxy(8) server DSA private key in PEM
                  format.
    
           tlsproxy_tls_eccert_file ($smtpd_tls_eccert_file)
                  File with the Postfix tlsproxy(8) server  ECDSA  certificate  in
                  PEM format.
    
           tlsproxy_tls_eckey_file ($smtpd_tls_eckey_file)
                  File  with  the  Postfix tlsproxy(8) server ECDSA private key in
                  PEM format.
    
           tlsproxy_tls_eecdh_grade ($smtpd_tls_eecdh_grade)
                  The Postfix tlsproxy(8)  server  security  grade  for  ephemeral
                  elliptic-curve Diffie-Hellman (EECDH) key exchange.
    
           tlsproxy_tls_exclude_ciphers ($smtpd_tls_exclude_ciphers)
                  List  of ciphers or cipher types to exclude from the tlsproxy(8)
                  server cipher list at all TLS security levels.
    
           tlsproxy_tls_fingerprint_digest ($smtpd_tls_fingerprint_digest)
                  The message digest algorithm to construct  remote  SMTP  client-
                  certificate fingerprints.
    
           tlsproxy_tls_key_file ($smtpd_tls_key_file)
                  File  with the Postfix tlsproxy(8) server RSA private key in PEM
                  format.
    
           tlsproxy_tls_loglevel ($smtpd_tls_loglevel)
                  Enable additional Postfix  tlsproxy(8)  server  logging  of  TLS
                  activity.
    
                  List  of  TLS protocols that the Postfix tlsproxy(8) server will
                  exclude or include with opportunistic TLS encryption.
    
           tlsproxy_tls_req_ccert ($smtpd_tls_req_ccert)
                  With mandatory TLS encryption, require  a  trusted  remote  SMTP
                  client certificate in order to allow TLS connections to proceed.
    
           tlsproxy_tls_security_level ($smtpd_tls_security_level)
                  The SMTP TLS security level for the Postfix tlsproxy(8)  server;
                  when a non-empty value is specified, this overrides the obsolete
                  parameters smtpd_use_tls and smtpd_enforce_tls.
    
           tlsproxy_tls_session_cache_timeout ($smtpd_tls_session_cache_timeout)
                  The expiration time of Postfix tlsproxy(8)  server  TLS  session
                  cache information.
    
    
    

    OBSOLETE STARTTLS SUPPORT CONTROLS

           These  parameters  are supported for compatibility with smtpd(8) legacy
           parameters.
    
           tlsproxy_use_tls ($smtpd_use_tls)
                  Opportunistic TLS: announce  STARTTLS  support  to  remote  SMTP
                  clients, but do not require that clients use TLS encryption.
    
           tlsproxy_enforce_tls ($smtpd_enforce_tls)
                  Mandatory TLS: announce STARTTLS support to remote SMTP clients,
                  and require that clients use TLS encryption.
    
    
    

    RESOURCE CONTROLS

           tlsproxy_watchdog_timeout (10s)
                  How much time a tlsproxy(8) process may take to process local or
                  remote I/O before it is terminated by a built-in watchdog timer.
    
    
    

    MISCELLANEOUS CONTROLS

           config_directory (see 'postconf -d' output)
                  The default location of the Postfix main.cf and  master.cf  con-
                  figuration files.
    
           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,  "post-
                  fix/smtpd".
    
           IBM T.J. Watson Research
           P.O. Box 704
           Yorktown Heights, NY 10598, USA
    
                                                                TLSPROXY(8postfix)
    
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