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-<!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 - smtp(8) </title>
-</head> <body> <pre>
-SMTP(8) SMTP(8)
-
-<b>NAME</b>
- smtp - Postfix SMTP+LMTP client
-
-<b>SYNOPSIS</b>
- <b>smtp</b> [generic Postfix daemon options]
-
-<b>DESCRIPTION</b>
- The Postfix SMTP+LMTP client implements the SMTP and LMTP mail delivery
- protocols. It processes message delivery requests from the queue man-
- ager. Each request specifies a queue file, a sender address, a domain
- or host to deliver to, and recipient information. This program expects
- to be run from the <a href="master.8.html"><b>master</b>(8)</a> process manager.
-
- The SMTP+LMTP client updates the queue file and marks recipients as
- finished, or it informs the queue manager that delivery should be tried
- again at a later time. Delivery status reports are sent to the
- <a href="bounce.8.html"><b>bounce</b>(8)</a>, <a href="defer.8.html"><b>defer</b>(8)</a> or <a href="trace.8.html"><b>trace</b>(8)</a> daemon as appropriate.
-
- The SMTP+LMTP client looks up a list of mail exchanger addresses for
- the destination host, sorts the list by preference, and connects to
- each listed address until it finds a server that responds.
-
- When a server is not reachable, or when mail delivery fails due to a
- recoverable error condition, the SMTP+LMTP client will try to deliver
- the mail to an alternate host.
-
- After a successful mail transaction, a connection may be saved to the
- <a href="scache.8.html"><b>scache</b>(8)</a> connection cache server, so that it may be used by any
- SMTP+LMTP client for a subsequent transaction.
-
- By default, connection caching is enabled temporarily for destinations
- that have a high volume of mail in the <a href="QSHAPE_README.html#active_queue">active queue</a>. Connection caching
- can be enabled permanently for specific destinations.
-
-<b>SMTP DESTINATION SYNTAX</b>
- SMTP destinations have the following form:
-
- <i>domainname</i>
-
- <i>domainname</i>:<i>port</i>
- Look up the mail exchangers for the specified domain, and con-
- nect to the specified port (default: <b>smtp</b>).
-
- [<i>hostname</i>]
-
- [<i>hostname</i>]:<i>port</i>
- Look up the address(es) of the specified host, and connect to
- the specified port (default: <b>smtp</b>).
-
- [<i>address</i>]
-
- [<i>address</i>]:<i>port</i>
- Connect to the host at the specified address, and connect to the
- specified port (default: <b>smtp</b>). An IPv6 address must be format-
- ted as [<b>ipv6</b>:<i>address</i>].
-
-<b>LMTP DESTINATION SYNTAX</b>
- LMTP destinations have the following form:
-
- <b>unix</b>:<i>pathname</i>
- Connect to the local UNIX-domain server that is bound to the
- specified <i>pathname</i>. If the process runs chrooted, an absolute
- pathname is interpreted relative to the Postfix queue directory.
-
- <b>inet</b>:<i>hostname</i>
-
- <b>inet</b>:<i>hostname</i>:<i>port</i>
-
- <b>inet</b>:[<i>address</i>]
-
- <b>inet</b>:[<i>address</i>]:<i>port</i>
- Connect to the specified TCP port on the specified local or
- remote host. If no port is specified, connect to the port
- defined as <b>lmtp</b> in <b>services</b>(4). If no such service is found,
- the <b><a href="postconf.5.html#lmtp_tcp_port">lmtp_tcp_port</a></b> configuration parameter (default value of 24)
- will be used. An IPv6 address must be formatted as
- [<b>ipv6</b>:<i>address</i>].
-
-<b>SECURITY</b>
- The SMTP+LMTP client is moderately security-sensitive. It talks to SMTP
- or LMTP servers and to DNS servers on the network. The SMTP+LMTP client
- can be run chrooted at fixed low privilege.
-
-<b>STANDARDS</b>
- <a href="http://tools.ietf.org/html/rfc821">RFC 821</a> (SMTP protocol)
- <a href="http://tools.ietf.org/html/rfc822">RFC 822</a> (ARPA Internet Text Messages)
- <a href="http://tools.ietf.org/html/rfc1651">RFC 1651</a> (SMTP service extensions)
- <a href="http://tools.ietf.org/html/rfc1652">RFC 1652</a> (8bit-MIME transport)
- <a href="http://tools.ietf.org/html/rfc1870">RFC 1870</a> (Message Size Declaration)
- <a href="http://tools.ietf.org/html/rfc2033">RFC 2033</a> (LMTP protocol)
- <a href="http://tools.ietf.org/html/rfc2034">RFC 2034</a> (SMTP Enhanced Error Codes)
- <a href="http://tools.ietf.org/html/rfc2045">RFC 2045</a> (MIME: Format of Internet Message Bodies)
- <a href="http://tools.ietf.org/html/rfc2046">RFC 2046</a> (MIME: Media Types)
- <a href="http://tools.ietf.org/html/rfc2554">RFC 2554</a> (AUTH command)
- <a href="http://tools.ietf.org/html/rfc2821">RFC 2821</a> (SMTP protocol)
- <a href="http://tools.ietf.org/html/rfc2920">RFC 2920</a> (SMTP Pipelining)
- <a href="http://tools.ietf.org/html/rfc3207">RFC 3207</a> (STARTTLS command)
- <a href="http://tools.ietf.org/html/rfc3461">RFC 3461</a> (SMTP DSN Extension)
- <a href="http://tools.ietf.org/html/rfc3463">RFC 3463</a> (Enhanced Status Codes)
- <a href="http://tools.ietf.org/html/rfc4954">RFC 4954</a> (AUTH command)
- <a href="http://tools.ietf.org/html/rfc5321">RFC 5321</a> (SMTP protocol)
-
-<b>DIAGNOSTICS</b>
- Problems and transactions are logged to <b>syslogd</b>(8). Corrupted message
- files are marked so that the queue manager can move them to the <b>corrupt</b>
- queue for further inspection.
-
- Depending on the setting of the <b><a href="postconf.5.html#notify_classes">notify_classes</a></b> parameter, the postmas-
- ter is notified of bounces, protocol problems, and of other trouble.
-
-<b>BUGS</b>
- SMTP and LMTP connection caching does not work with TLS. The necessary
- support for TLS object passivation and re-activation does not exist
- without closing the session, which defeats the purpose.
-
- SMTP and LMTP connection caching assumes that SASL credentials are
- valid for all destinations that map onto the same IP address and TCP
- port.
-
-<b>CONFIGURATION PARAMETERS</b>
- Before Postfix version 2.3, the LMTP client is a separate program that
- implements only a subset of the functionality available with SMTP:
- there is no support for TLS, and connections are cached in-process,
- making it ineffective when the client is used for multiple domains.
-
- Most smtp_<i>xxx</i> configuration parameters have an lmtp_<i>xxx</i> "mirror" param-
- eter for the equivalent LMTP feature. This document describes only
- those LMTP-related parameters that aren't simply "mirror" parameters.
-
- Changes to <a href="postconf.5.html"><b>main.cf</b></a> are picked up automatically, as <a href="smtp.8.html"><b>smtp</b>(8)</a> processes
- run for only a limited amount of time. 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>COMPATIBILITY CONTROLS</b>
- <b><a href="postconf.5.html#ignore_mx_lookup_error">ignore_mx_lookup_error</a> (no)</b>
- Ignore DNS MX lookups that produce no response.
-
- <b><a href="postconf.5.html#smtp_always_send_ehlo">smtp_always_send_ehlo</a> (yes)</b>
- Always send EHLO at the start of an SMTP session.
-
- <b><a href="postconf.5.html#smtp_never_send_ehlo">smtp_never_send_ehlo</a> (no)</b>
- Never send EHLO at the start of an SMTP session.
-
- <b><a href="postconf.5.html#smtp_defer_if_no_mx_address_found">smtp_defer_if_no_mx_address_found</a> (no)</b>
- Defer mail delivery when no MX record resolves to an IP address.
-
- <b><a href="postconf.5.html#smtp_line_length_limit">smtp_line_length_limit</a> (998)</b>
- The maximal length of message header and body lines that Postfix
- will send via SMTP.
-
- <b><a href="postconf.5.html#smtp_pix_workaround_delay_time">smtp_pix_workaround_delay_time</a> (10s)</b>
- How long the Postfix SMTP client pauses before sending
- ".<CR><LF>" in order to work around the PIX firewall
- "<CR><LF>.<CR><LF>" bug.
-
- <b><a href="postconf.5.html#smtp_pix_workaround_threshold_time">smtp_pix_workaround_threshold_time</a> (500s)</b>
- How long a message must be queued before the Postfix SMTP client
- turns on the PIX firewall "<CR><LF>.<CR><LF>" bug workaround for
- delivery through firewalls with "smtp fixup" mode turned on.
-
- <b><a href="postconf.5.html#smtp_pix_workarounds">smtp_pix_workarounds</a> (disable_esmtp, delay_dotcrlf)</b>
- A list that specifies zero or more workarounds for CISCO PIX
- firewall bugs.
-
- <b><a href="postconf.5.html#smtp_pix_workaround_maps">smtp_pix_workaround_maps</a> (empty)</b>
- Lookup tables, indexed by the remote SMTP server address, with
- per-destination workarounds for CISCO PIX firewall bugs.
-
- <b><a href="postconf.5.html#smtp_quote_rfc821_envelope">smtp_quote_rfc821_envelope</a> (yes)</b>
- Quote addresses in Postfix SMTP client MAIL FROM and RCPT TO
- commands as required by <a href="http://tools.ietf.org/html/rfc5321">RFC 5321</a>.
-
- <b><a href="postconf.5.html#smtp_reply_filter">smtp_reply_filter</a> (empty)</b>
- A mechanism to transform replies from remote SMTP servers one
- line at a time.
-
- <b><a href="postconf.5.html#smtp_skip_5xx_greeting">smtp_skip_5xx_greeting</a> (yes)</b>
- Skip remote SMTP servers that greet with a 5XX status code.
-
- <b><a href="postconf.5.html#smtp_skip_quit_response">smtp_skip_quit_response</a> (yes)</b>
- Do not wait for the response to the SMTP QUIT command.
-
- Available in Postfix version 2.0 and earlier:
-
- <b><a href="postconf.5.html#smtp_skip_4xx_greeting">smtp_skip_4xx_greeting</a> (yes)</b>
- Skip SMTP servers that greet with a 4XX status code (go away,
- try again later).
-
- Available in Postfix version 2.2 and later:
-
- <b><a href="postconf.5.html#smtp_discard_ehlo_keyword_address_maps">smtp_discard_ehlo_keyword_address_maps</a> (empty)</b>
- Lookup tables, indexed by the remote SMTP server address, with
- case insensitive lists of EHLO keywords (pipelining, starttls,
- auth, etc.) that the Postfix SMTP client will ignore in the EHLO
- response from a remote SMTP server.
-
- <b><a href="postconf.5.html#smtp_discard_ehlo_keywords">smtp_discard_ehlo_keywords</a> (empty)</b>
- A case insensitive list of EHLO keywords (pipelining, starttls,
- auth, etc.) that the Postfix SMTP client will ignore in the EHLO
- response from a remote SMTP server.
-
- <b><a href="postconf.5.html#smtp_generic_maps">smtp_generic_maps</a> (empty)</b>
- Optional lookup tables that perform address rewriting in the
- Postfix SMTP client, typically to transform a locally valid
- address into a globally valid address when sending mail across
- the Internet.
-
- Available in Postfix version 2.2.9 and later:
-
- <b><a href="postconf.5.html#smtp_cname_overrides_servername">smtp_cname_overrides_servername</a> (version dependent)</b>
- Allow DNS CNAME records to override the servername that the
- Postfix SMTP client uses for logging, SASL password lookup, TLS
- policy decisions, or TLS certificate verification.
-
- Available in Postfix version 2.3 and later:
-
- <b><a href="postconf.5.html#lmtp_discard_lhlo_keyword_address_maps">lmtp_discard_lhlo_keyword_address_maps</a> (empty)</b>
- Lookup tables, indexed by the remote LMTP server address, with
- case insensitive lists of LHLO keywords (pipelining, starttls,
- auth, etc.) that the Postfix LMTP client will ignore in the LHLO
- response from a remote LMTP server.
-
- <b><a href="postconf.5.html#lmtp_discard_lhlo_keywords">lmtp_discard_lhlo_keywords</a> (empty)</b>
- A case insensitive list of LHLO keywords (pipelining, starttls,
- auth, etc.) that the Postfix LMTP client will ignore in the LHLO
- response from a remote LMTP server.
-
- Available in Postfix version 2.4.4 and later:
-
- <b><a href="postconf.5.html#send_cyrus_sasl_authzid">send_cyrus_sasl_authzid</a> (no)</b>
- When authenticating to a remote SMTP or LMTP server with the
- default setting "no", send no SASL authoriZation ID (authzid);
- send only the SASL authentiCation ID (authcid) plus the auth-
- cid's password.
-
- Available in Postfix version 2.5 and later:
-
- <b><a href="postconf.5.html#smtp_header_checks">smtp_header_checks</a> (empty)</b>
- Restricted <a href="header_checks.5.html"><b>header_checks</b>(5)</a> tables for the Postfix SMTP client.
-
- <b><a href="postconf.5.html#smtp_mime_header_checks">smtp_mime_header_checks</a> (empty)</b>
- Restricted <b><a href="postconf.5.html#mime_header_checks">mime_header_checks</a></b>(5) tables for the Postfix SMTP
- client.
-
- <b><a href="postconf.5.html#smtp_nested_header_checks">smtp_nested_header_checks</a> (empty)</b>
- Restricted <b><a href="postconf.5.html#nested_header_checks">nested_header_checks</a></b>(5) tables for the Postfix SMTP
- client.
-
- <b><a href="postconf.5.html#smtp_body_checks">smtp_body_checks</a> (empty)</b>
- Restricted <a href="header_checks.5.html"><b>body_checks</b>(5)</a> tables for the Postfix SMTP client.
-
- Available in Postfix version 2.6 and later:
-
- <b><a href="postconf.5.html#tcp_windowsize">tcp_windowsize</a> (0)</b>
- An optional workaround for routers that break TCP window scal-
- ing.
-
- Available in Postfix version 2.8 and later:
-
- <b><a href="postconf.5.html#smtp_dns_resolver_options">smtp_dns_resolver_options</a> (empty)</b>
- DNS Resolver options for the Postfix SMTP client.
-
- Available in Postfix version 2.9 and later:
-
- <b><a href="postconf.5.html#smtp_per_record_deadline">smtp_per_record_deadline</a> (no)</b>
- Change the behavior of the smtp_*_timeout time limits, from a
- time limit per read or write system call, to a time limit to
- send or receive a complete record (an SMTP command line, SMTP
- response line, SMTP message content line, or TLS protocol mes-
- sage).
-
- <b><a href="postconf.5.html#smtp_send_dummy_mail_auth">smtp_send_dummy_mail_auth</a> (no)</b>
- Whether or not to append the "AUTH=<>" option to the MAIL FROM
- command in SASL-authenticated SMTP sessions.
-
- Available in Postfix version 2.11 and later:
-
- <b><a href="postconf.5.html#smtp_dns_support_level">smtp_dns_support_level</a> (empty)</b>
- Level of DNS support in the Postfix SMTP client.
-
-<b>MIME PROCESSING CONTROLS</b>
- Available in Postfix version 2.0 and later:
-
- <b><a href="postconf.5.html#disable_mime_output_conversion">disable_mime_output_conversion</a> (no)</b>
- Disable the conversion of 8BITMIME format to 7BIT format.
-
- <b><a href="postconf.5.html#mime_boundary_length_limit">mime_boundary_length_limit</a> (2048)</b>
- The maximal length of MIME multipart boundary strings.
-
- <b><a href="postconf.5.html#mime_nesting_limit">mime_nesting_limit</a> (100)</b>
- The maximal recursion level that the MIME processor will handle.
-
-<b>EXTERNAL CONTENT INSPECTION CONTROLS</b>
- Available in Postfix version 2.1 and later:
-
- <b><a href="postconf.5.html#smtp_send_xforward_command">smtp_send_xforward_command</a> (no)</b>
- Send the non-standard XFORWARD command when the Postfix SMTP
- server EHLO response announces XFORWARD support.
-
-<b>SASL AUTHENTICATION CONTROLS</b>
- <b><a href="postconf.5.html#smtp_sasl_auth_enable">smtp_sasl_auth_enable</a> (no)</b>
- Enable SASL authentication in the Postfix SMTP client.
-
- <b><a href="postconf.5.html#smtp_sasl_password_maps">smtp_sasl_password_maps</a> (empty)</b>
- Optional Postfix SMTP client lookup tables with one user-
- name:password entry per remote hostname or domain, or sender
- address when sender-dependent authentication is enabled.
-
- <b><a href="postconf.5.html#smtp_sasl_security_options">smtp_sasl_security_options</a> (noplaintext, noanonymous)</b>
- Postfix SMTP client SASL security options; as of Postfix 2.3 the
- list of available features depends on the SASL client implemen-
- tation that is selected with <b><a href="postconf.5.html#smtp_sasl_type">smtp_sasl_type</a></b>.
-
- Available in Postfix version 2.2 and later:
-
- <b><a href="postconf.5.html#smtp_sasl_mechanism_filter">smtp_sasl_mechanism_filter</a> (empty)</b>
- If non-empty, a Postfix SMTP client filter for the remote SMTP
- server's list of offered SASL mechanisms.
-
- Available in Postfix version 2.3 and later:
-
- <b><a href="postconf.5.html#smtp_sender_dependent_authentication">smtp_sender_dependent_authentication</a> (no)</b>
- Enable sender-dependent authentication in the Postfix SMTP
- client; this is available only with SASL authentication, and
- disables SMTP connection caching to ensure that mail from dif-
- ferent senders will use the appropriate credentials.
-
- <b><a href="postconf.5.html#smtp_sasl_path">smtp_sasl_path</a> (empty)</b>
- Implementation-specific information that the Postfix SMTP client
- passes through to the SASL plug-in implementation that is
- selected with <b><a href="postconf.5.html#smtp_sasl_type">smtp_sasl_type</a></b>.
-
- <b><a href="postconf.5.html#smtp_sasl_type">smtp_sasl_type</a> (cyrus)</b>
- The SASL plug-in type that the Postfix SMTP client should use
- for authentication.
-
- Available in Postfix version 2.5 and later:
-
- <b><a href="postconf.5.html#smtp_sasl_auth_cache_name">smtp_sasl_auth_cache_name</a> (empty)</b>
- An optional table to prevent repeated SASL authentication fail-
- ures with the same remote SMTP server hostname, username and
- password.
-
- <b><a href="postconf.5.html#smtp_sasl_auth_cache_time">smtp_sasl_auth_cache_time</a> (90d)</b>
- The maximal age of an <a href="postconf.5.html#smtp_sasl_auth_cache_name">smtp_sasl_auth_cache_name</a> entry before it
- is removed.
-
- <b><a href="postconf.5.html#smtp_sasl_auth_soft_bounce">smtp_sasl_auth_soft_bounce</a> (yes)</b>
- When a remote SMTP server rejects a SASL authentication request
- with a 535 reply code, defer mail delivery instead of returning
- mail as undeliverable.
-
- Available in Postfix version 2.9 and later:
-
- <b><a href="postconf.5.html#smtp_send_dummy_mail_auth">smtp_send_dummy_mail_auth</a> (no)</b>
- Whether or not to append the "AUTH=<>" option to the MAIL FROM
- command in SASL-authenticated SMTP sessions.
-
-<b>STARTTLS SUPPORT CONTROLS</b>
- Detailed information about STARTTLS configuration may be found in the
- <a href="TLS_README.html">TLS_README</a> document.
-
- <b><a href="postconf.5.html#smtp_tls_security_level">smtp_tls_security_level</a> (empty)</b>
- The default SMTP TLS security level for the Postfix SMTP client;
- when a non-empty value is specified, this overrides the obsolete
- parameters <a href="postconf.5.html#smtp_use_tls">smtp_use_tls</a>, <a href="postconf.5.html#smtp_enforce_tls">smtp_enforce_tls</a>, and
- <a href="postconf.5.html#smtp_tls_enforce_peername">smtp_tls_enforce_peername</a>.
-
- <b><a href="postconf.5.html#smtp_sasl_tls_security_options">smtp_sasl_tls_security_options</a> ($<a href="postconf.5.html#smtp_sasl_security_options">smtp_sasl_security_options</a>)</b>
- The SASL authentication security options that the Postfix SMTP
- client uses for TLS encrypted SMTP sessions.
-
- <b><a href="postconf.5.html#smtp_starttls_timeout">smtp_starttls_timeout</a> (300s)</b>
- Time limit for Postfix SMTP client write and read operations
- during TLS startup and shutdown handshake procedures.
-
- <b><a href="postconf.5.html#smtp_tls_CAfile">smtp_tls_CAfile</a> (empty)</b>
- A file containing CA certificates of root CAs trusted to sign
- either remote SMTP server certificates or intermediate CA cer-
- tificates.
-
- <b><a href="postconf.5.html#smtp_tls_CApath">smtp_tls_CApath</a> (empty)</b>
- Directory with PEM format certificate authority certificates
- that the Postfix SMTP client uses to verify a remote SMTP server
- certificate.
-
- <b><a href="postconf.5.html#smtp_tls_cert_file">smtp_tls_cert_file</a> (empty)</b>
- File with the Postfix SMTP client RSA certificate in PEM format.
-
- <b><a href="postconf.5.html#smtp_tls_mandatory_ciphers">smtp_tls_mandatory_ciphers</a> (medium)</b>
- The minimum TLS cipher grade that the Postfix SMTP client will
- use with mandatory TLS encryption.
-
- <b><a href="postconf.5.html#smtp_tls_exclude_ciphers">smtp_tls_exclude_ciphers</a> (empty)</b>
- List of ciphers or cipher types to exclude from the Postfix SMTP
- client cipher list at all TLS security levels.
-
- <b><a href="postconf.5.html#smtp_tls_mandatory_exclude_ciphers">smtp_tls_mandatory_exclude_ciphers</a> (empty)</b>
- Additional list of ciphers or cipher types to exclude from the
- Postfix SMTP client cipher list at mandatory TLS security lev-
- els.
-
- <b><a href="postconf.5.html#smtp_tls_dcert_file">smtp_tls_dcert_file</a> (empty)</b>
- File with the Postfix SMTP client DSA certificate in PEM format.
-
- <b><a href="postconf.5.html#smtp_tls_dkey_file">smtp_tls_dkey_file</a> ($<a href="postconf.5.html#smtp_tls_dcert_file">smtp_tls_dcert_file</a>)</b>
- File with the Postfix SMTP client DSA private key in PEM format.
-
- <b><a href="postconf.5.html#smtp_tls_key_file">smtp_tls_key_file</a> ($<a href="postconf.5.html#smtp_tls_cert_file">smtp_tls_cert_file</a>)</b>
- File with the Postfix SMTP client RSA private key in PEM format.
-
- <b><a href="postconf.5.html#smtp_tls_loglevel">smtp_tls_loglevel</a> (0)</b>
- Enable additional Postfix SMTP client logging of TLS activity.
-
- <b><a href="postconf.5.html#smtp_tls_note_starttls_offer">smtp_tls_note_starttls_offer</a> (no)</b>
- Log the hostname of a remote SMTP server that offers STARTTLS,
- when TLS is not already enabled for that server.
-
- <b><a href="postconf.5.html#smtp_tls_policy_maps">smtp_tls_policy_maps</a> (empty)</b>
- Optional lookup tables with the Postfix SMTP client TLS security
- policy by next-hop destination; when a non-empty value is speci-
- fied, this overrides the obsolete <a href="postconf.5.html#smtp_tls_per_site">smtp_tls_per_site</a> parameter.
-
- <b><a href="postconf.5.html#smtp_tls_mandatory_protocols">smtp_tls_mandatory_protocols</a> (!SSLv2)</b>
- List of SSL/TLS protocols that the Postfix SMTP client will use
- with mandatory TLS encryption.
-
- <b><a href="postconf.5.html#smtp_tls_scert_verifydepth">smtp_tls_scert_verifydepth</a> (9)</b>
- The verification depth for remote SMTP server certificates.
-
- <b><a href="postconf.5.html#smtp_tls_secure_cert_match">smtp_tls_secure_cert_match</a> (nexthop, dot-nexthop)</b>
- How the Postfix SMTP client verifies the server certificate
- peername for the "secure" TLS security level.
-
- <b><a href="postconf.5.html#smtp_tls_session_cache_database">smtp_tls_session_cache_database</a> (empty)</b>
- Name of the file containing the optional Postfix SMTP client TLS
- session cache.
-
- <b><a href="postconf.5.html#smtp_tls_session_cache_timeout">smtp_tls_session_cache_timeout</a> (3600s)</b>
- The expiration time of Postfix SMTP client TLS session cache
- information.
-
- <b><a href="postconf.5.html#smtp_tls_verify_cert_match">smtp_tls_verify_cert_match</a> (hostname)</b>
- How the Postfix SMTP client verifies the server certificate
- peername for the "verify" TLS security level.
-
- <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> (ALL:!EXPORT:!LOW:!MEDIUM:+RC4:@STRENGTH)</b>
- The OpenSSL cipherlist for "HIGH" grade ciphers.
-
- <b><a href="postconf.5.html#tls_medium_cipherlist">tls_medium_cipherlist</a> (ALL:!EXPORT:!LOW:+RC4:@STRENGTH)</b>
- The OpenSSL cipherlist for "MEDIUM" or higher grade ciphers.
-
- <b><a href="postconf.5.html#tls_low_cipherlist">tls_low_cipherlist</a> (ALL:!EXPORT:+RC4:@STRENGTH)</b>
- The OpenSSL cipherlist for "LOW" or higher grade ciphers.
-
- <b><a href="postconf.5.html#tls_export_cipherlist">tls_export_cipherlist</a> (ALL:+RC4:@STRENGTH)</b>
- The OpenSSL cipherlist for "EXPORT" 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.
-
- Available in Postfix version 2.4 and later:
-
- <b><a href="postconf.5.html#smtp_sasl_tls_verified_security_options">smtp_sasl_tls_verified_security_options</a> ($<a href="postconf.5.html#smtp_sasl_tls_security_options">smtp_sasl_tls_secu</a>-</b>
- <b><a href="postconf.5.html#smtp_sasl_tls_security_options">rity_options</a>)</b>
- The SASL authentication security options that the Postfix SMTP
- client uses for TLS encrypted SMTP sessions with a verified
- server certificate.
-
- Available in Postfix version 2.5 and later:
-
- <b><a href="postconf.5.html#smtp_tls_fingerprint_cert_match">smtp_tls_fingerprint_cert_match</a> (empty)</b>
- List of acceptable remote SMTP server certificate fingerprints
- for the "fingerprint" TLS security level (<b><a href="postconf.5.html#smtp_tls_security_level">smtp_tls_secu</a>-</b>
- <b><a href="postconf.5.html#smtp_tls_security_level">rity_level</a></b> = fingerprint).
-
- <b><a href="postconf.5.html#smtp_tls_fingerprint_digest">smtp_tls_fingerprint_digest</a> (md5)</b>
- The message digest algorithm used to construct remote SMTP
- server certificate fingerprints.
-
- Available in Postfix version 2.6 and later:
-
- <b><a href="postconf.5.html#smtp_tls_protocols">smtp_tls_protocols</a> (!SSLv2)</b>
- List of TLS protocols that the Postfix SMTP client will exclude
- or include with opportunistic TLS encryption.
-
- <b><a href="postconf.5.html#smtp_tls_ciphers">smtp_tls_ciphers</a> (export)</b>
- The minimum TLS cipher grade that the Postfix SMTP client will
- use with opportunistic TLS encryption.
-
- <b><a href="postconf.5.html#smtp_tls_eccert_file">smtp_tls_eccert_file</a> (empty)</b>
- File with the Postfix SMTP client ECDSA certificate in PEM for-
- mat.
-
- <b><a href="postconf.5.html#smtp_tls_eckey_file">smtp_tls_eckey_file</a> ($<a href="postconf.5.html#smtp_tls_eccert_file">smtp_tls_eccert_file</a>)</b>
- File with the Postfix SMTP client ECDSA private key in PEM for-
- mat.
-
- Available in Postfix version 2.7 and later:
-
- <b><a href="postconf.5.html#smtp_tls_block_early_mail_reply">smtp_tls_block_early_mail_reply</a> (no)</b>
- Try to detect a mail hijacking attack based on a TLS protocol
- vulnerability (CVE-2009-3555), where an attacker prepends mali-
- cious HELO, MAIL, RCPT, DATA commands to a Postfix SMTP client
- TLS session.
-
- Available in Postfix version 2.8 and later:
-
- <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.
-
- Available in Postfix version 2.11 and later:
-
- <b><a href="postconf.5.html#smtp_tls_trust_anchor_file">smtp_tls_trust_anchor_file</a> (empty)</b>
- Zero or more PEM-format files with trust-anchor certificates
- and/or public keys.
-
- <b><a href="postconf.5.html#smtp_tls_force_insecure_host_tlsa_lookup">smtp_tls_force_insecure_host_tlsa_lookup</a> (no)</b>
- Lookup the associated DANE TLSA RRset even when a hostname is
- not an alias and its address records lie in an unsigned zone.
-
- <b><a href="postconf.5.html#tls_dane_trust_anchor_digest_enable">tls_dane_trust_anchor_digest_enable</a> (yes)</b>
- <a href="http://tools.ietf.org/html/rfc6698">RFC 6698</a> trust-anchor digest support in the Postfix TLS library.
-
- <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>.
-
-<b>OBSOLETE STARTTLS CONTROLS</b>
- The following configuration parameters exist for compatibility with
- Postfix versions before 2.3. Support for these will be removed in a
- future release.
-
- <b><a href="postconf.5.html#smtp_use_tls">smtp_use_tls</a> (no)</b>
- Opportunistic mode: use TLS when a remote SMTP server announces
- STARTTLS support, otherwise send the mail in the clear.
-
- <b><a href="postconf.5.html#smtp_enforce_tls">smtp_enforce_tls</a> (no)</b>
- Enforcement mode: require that remote SMTP servers use TLS
- encryption, and never send mail in the clear.
-
- <b><a href="postconf.5.html#smtp_tls_enforce_peername">smtp_tls_enforce_peername</a> (yes)</b>
- With mandatory TLS encryption, require that the remote SMTP
- server hostname matches the information in the remote SMTP
- server certificate.
-
- <b><a href="postconf.5.html#smtp_tls_per_site">smtp_tls_per_site</a> (empty)</b>
- Optional lookup tables with the Postfix SMTP client TLS usage
- policy by next-hop destination and by remote SMTP server host-
- name.
-
- <b><a href="postconf.5.html#smtp_tls_cipherlist">smtp_tls_cipherlist</a> (empty)</b>
- Obsolete Postfix < 2.3 control for the Postfix SMTP client TLS
- cipher list.
-
-<b>RESOURCE AND RATE CONTROLS</b>
- <b><a href="postconf.5.html#smtp_destination_concurrency_limit">smtp_destination_concurrency_limit</a> ($<a href="postconf.5.html#default_destination_concurrency_limit">default_destination_concur</a>-</b>
- <b><a href="postconf.5.html#default_destination_concurrency_limit">rency_limit</a>)</b>
- The maximal number of parallel deliveries to the same destina-
- tion via the smtp message delivery transport.
-
- <b><a href="postconf.5.html#smtp_destination_recipient_limit">smtp_destination_recipient_limit</a> ($<a href="postconf.5.html#default_destination_recipient_limit">default_destination_recipient_limit</a>)</b>
- The maximal number of recipients per message for the smtp mes-
- sage delivery transport.
-
- <b><a href="postconf.5.html#smtp_connect_timeout">smtp_connect_timeout</a> (30s)</b>
- The Postfix SMTP client time limit for completing a TCP connec-
- tion, or zero (use the operating system built-in time limit).
-
- <b><a href="postconf.5.html#smtp_helo_timeout">smtp_helo_timeout</a> (300s)</b>
- The Postfix SMTP client time limit for sending the HELO or EHLO
- command, and for receiving the initial remote SMTP server
- response.
-
- <b><a href="postconf.5.html#lmtp_lhlo_timeout">lmtp_lhlo_timeout</a> (300s)</b>
- The Postfix LMTP client time limit for sending the LHLO command,
- and for receiving the initial remote LMTP server response.
-
- <b><a href="postconf.5.html#smtp_xforward_timeout">smtp_xforward_timeout</a> (300s)</b>
- The Postfix SMTP client time limit for sending the XFORWARD com-
- mand, and for receiving the remote SMTP server response.
-
- <b><a href="postconf.5.html#smtp_mail_timeout">smtp_mail_timeout</a> (300s)</b>
- The Postfix SMTP client time limit for sending the MAIL FROM
- command, and for receiving the remote SMTP server response.
-
- <b><a href="postconf.5.html#smtp_rcpt_timeout">smtp_rcpt_timeout</a> (300s)</b>
- The Postfix SMTP client time limit for sending the SMTP RCPT TO
- command, and for receiving the remote SMTP server response.
-
- <b><a href="postconf.5.html#smtp_data_init_timeout">smtp_data_init_timeout</a> (120s)</b>
- The Postfix SMTP client time limit for sending the SMTP DATA
- command, and for receiving the remote SMTP server response.
-
- <b><a href="postconf.5.html#smtp_data_xfer_timeout">smtp_data_xfer_timeout</a> (180s)</b>
- The Postfix SMTP client time limit for sending the SMTP message
- content.
-
- <b><a href="postconf.5.html#smtp_data_done_timeout">smtp_data_done_timeout</a> (600s)</b>
- The Postfix SMTP client time limit for sending the SMTP ".", and
- for receiving the remote SMTP server response.
-
- <b><a href="postconf.5.html#smtp_quit_timeout">smtp_quit_timeout</a> (300s)</b>
- The Postfix SMTP client time limit for sending the QUIT command,
- and for receiving the remote SMTP server response.
-
- Available in Postfix version 2.1 and later:
-
- <b><a href="postconf.5.html#smtp_mx_address_limit">smtp_mx_address_limit</a> (5)</b>
- The maximal number of MX (mail exchanger) IP addresses that can
- result from Postfix SMTP client mail exchanger lookups, or zero
- (no limit).
-
- <b><a href="postconf.5.html#smtp_mx_session_limit">smtp_mx_session_limit</a> (2)</b>
- The maximal number of SMTP sessions per delivery request before
- the Postfix SMTP client gives up or delivers to a fall-back
- <a href="postconf.5.html#relayhost">relay host</a>, or zero (no limit).
-
- <b><a href="postconf.5.html#smtp_rset_timeout">smtp_rset_timeout</a> (20s)</b>
- The Postfix SMTP client time limit for sending the RSET command,
- and for receiving the remote SMTP server response.
-
- Available in Postfix version 2.2 and earlier:
-
- <b><a href="postconf.5.html#lmtp_cache_connection">lmtp_cache_connection</a> (yes)</b>
- Keep Postfix LMTP client connections open for up to $<a href="postconf.5.html#max_idle">max_idle</a>
- seconds.
-
- Available in Postfix version 2.2 and later:
-
- <b><a href="postconf.5.html#smtp_connection_cache_destinations">smtp_connection_cache_destinations</a> (empty)</b>
- Permanently enable SMTP connection caching for the specified
- destinations.
-
- <b><a href="postconf.5.html#smtp_connection_cache_on_demand">smtp_connection_cache_on_demand</a> (yes)</b>
- Temporarily enable SMTP connection caching while a destination
- has a high volume of mail in the <a href="QSHAPE_README.html#active_queue">active queue</a>.
-
- <b><a href="postconf.5.html#smtp_connection_reuse_time_limit">smtp_connection_reuse_time_limit</a> (300s)</b>
- The amount of time during which Postfix will use an SMTP connec-
- tion repeatedly.
-
- <b><a href="postconf.5.html#smtp_connection_cache_time_limit">smtp_connection_cache_time_limit</a> (2s)</b>
- When SMTP connection caching is enabled, the amount of time that
- an unused SMTP client socket is kept open before it is closed.
-
- Available in Postfix version 2.3 and later:
-
- <b><a href="postconf.5.html#connection_cache_protocol_timeout">connection_cache_protocol_timeout</a> (5s)</b>
- Time limit for connection cache connect, send or receive opera-
- tions.
-
- Available in Postfix version 2.9 and later:
-
- <b><a href="postconf.5.html#smtp_per_record_deadline">smtp_per_record_deadline</a> (no)</b>
- Change the behavior of the smtp_*_timeout time limits, from a
- time limit per read or write system call, to a time limit to
- send or receive a complete record (an SMTP command line, SMTP
- response line, SMTP message content line, or TLS protocol mes-
- sage).
-
- Available in Postfix version 2.11 and later:
-
- <b><a href="postconf.5.html#smtp_connection_reuse_count_limit">smtp_connection_reuse_count_limit</a> (0)</b>
- When SMTP connection caching is enabled, the number of times
- that an SMTP session may be reused before it is closed, or zero
- (no limit).
-
-<b>TROUBLE SHOOTING CONTROLS</b>
- <b><a href="postconf.5.html#debug_peer_level">debug_peer_level</a> (2)</b>
- The increment in verbose logging level when a remote client or
- server matches a pattern in the <a href="postconf.5.html#debug_peer_list">debug_peer_list</a> parameter.
-
- <b><a href="postconf.5.html#debug_peer_list">debug_peer_list</a> (empty)</b>
- Optional list of remote client or server hostname or network
- address patterns that cause the verbose logging level to
- increase by the amount specified in $<a href="postconf.5.html#debug_peer_level">debug_peer_level</a>.
-
- <b><a href="postconf.5.html#error_notice_recipient">error_notice_recipient</a> (postmaster)</b>
- The recipient of postmaster notifications about mail delivery
- problems that are caused by policy, resource, software or proto-
- col errors.
-
- <b><a href="postconf.5.html#internal_mail_filter_classes">internal_mail_filter_classes</a> (empty)</b>
- What categories of Postfix-generated mail are subject to before-
- queue content inspection by <a href="postconf.5.html#non_smtpd_milters">non_smtpd_milters</a>, <a href="postconf.5.html#header_checks">header_checks</a> and
- <a href="postconf.5.html#body_checks">body_checks</a>.
-
- <b><a href="postconf.5.html#notify_classes">notify_classes</a> (resource, software)</b>
- The list of error classes that are reported to the postmaster.
-
-<b>MISCELLANEOUS CONTROLS</b>
- <b><a href="postconf.5.html#best_mx_transport">best_mx_transport</a> (empty)</b>
- Where the Postfix SMTP client should deliver mail when it
- detects a "mail loops back to myself" error condition.
-
- <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#daemon_timeout">daemon_timeout</a> (18000s)</b>
- How much time a Postfix daemon process may take to handle a
- request before it is terminated by a built-in watchdog timer.
-
- <b><a href="postconf.5.html#delay_logging_resolution_limit">delay_logging_resolution_limit</a> (2)</b>
- The maximal number of digits after the decimal point when log-
- ging sub-second delay values.
-
- <b><a href="postconf.5.html#disable_dns_lookups">disable_dns_lookups</a> (no)</b>
- Disable DNS lookups in the Postfix SMTP and LMTP clients.
-
- <b><a href="postconf.5.html#inet_interfaces">inet_interfaces</a> (all)</b>
- The network interface addresses that this mail system receives
- mail on.
-
- <b><a href="postconf.5.html#inet_protocols">inet_protocols</a> (all)</b>
- The Internet protocols Postfix will attempt to use when making
- or accepting connections.
-
- <b><a href="postconf.5.html#ipc_timeout">ipc_timeout</a> (3600s)</b>
- The time limit for sending or receiving information over an
- internal communication channel.
-
- <b><a href="postconf.5.html#lmtp_assume_final">lmtp_assume_final</a> (no)</b>
- When a remote LMTP server announces no DSN support, assume that
- the server performs final delivery, and send "delivered" deliv-
- ery status notifications instead of "relayed".
-
- <b><a href="postconf.5.html#lmtp_tcp_port">lmtp_tcp_port</a> (24)</b>
- The default TCP port that the Postfix LMTP client connects to.
-
- <b><a href="postconf.5.html#max_idle">max_idle</a> (100s)</b>
- The maximum amount of time that an idle Postfix daemon process
- waits for an incoming connection before terminating voluntarily.
-
- <b><a href="postconf.5.html#max_use">max_use</a> (100)</b>
- The maximal number of incoming connections that a Postfix daemon
- process will service before terminating voluntarily.
-
- <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#proxy_interfaces">proxy_interfaces</a> (empty)</b>
- The network interface addresses that this mail system receives
- mail on by way of a proxy or network address translation unit.
-
- <b><a href="postconf.5.html#smtp_address_preference">smtp_address_preference</a> (any)</b>
- The address type ("ipv6", "ipv4" or "any") that the Postfix SMTP
- client will try first, when a destination has IPv6 and IPv4
- addresses with equal MX preference.
-
- <b><a href="postconf.5.html#smtp_bind_address">smtp_bind_address</a> (empty)</b>
- An optional numerical network address that the Postfix SMTP
- client should bind to when making an IPv4 connection.
-
- <b><a href="postconf.5.html#smtp_bind_address6">smtp_bind_address6</a> (empty)</b>
- An optional numerical network address that the Postfix SMTP
- client should bind to when making an IPv6 connection.
-
- <b><a href="postconf.5.html#smtp_helo_name">smtp_helo_name</a> ($<a href="postconf.5.html#myhostname">myhostname</a>)</b>
- The hostname to send in the SMTP EHLO or HELO command.
-
- <b><a href="postconf.5.html#lmtp_lhlo_name">lmtp_lhlo_name</a> ($<a href="postconf.5.html#myhostname">myhostname</a>)</b>
- The hostname to send in the LMTP LHLO command.
-
- <b><a href="postconf.5.html#smtp_host_lookup">smtp_host_lookup</a> (dns)</b>
- What mechanisms the Postfix SMTP client uses to look up a host's
- IP address.
-
- <b><a href="postconf.5.html#smtp_randomize_addresses">smtp_randomize_addresses</a> (yes)</b>
- Randomize the order of equal-preference MX host addresses.
-
- <b><a href="postconf.5.html#syslog_facility">syslog_facility</a> (mail)</b>
- The syslog facility of Postfix logging.
-
- <b><a href="postconf.5.html#syslog_name">syslog_name</a> (see 'postconf -d' output)</b>
- The mail system name that is prepended to the process name in
- syslog records, so that "smtpd" becomes, for example, "post-
- fix/smtpd".
-
- Available with Postfix 2.2 and earlier:
-
- <b><a href="postconf.5.html#fallback_relay">fallback_relay</a> (empty)</b>
- Optional list of relay hosts for SMTP destinations that can't be
- found or that are unreachable.
-
- Available with Postfix 2.3 and later:
-
- <b><a href="postconf.5.html#smtp_fallback_relay">smtp_fallback_relay</a> ($<a href="postconf.5.html#fallback_relay">fallback_relay</a>)</b>
- Optional list of relay hosts for SMTP destinations that can't be
- found or that are unreachable.
-
-<b>SEE ALSO</b>
- <a href="generic.5.html">generic(5)</a>, output address rewriting
- <a href="header_checks.5.html">header_checks(5)</a>, message header content inspection
- <a href="header_checks.5.html">body_checks(5)</a>, body parts content inspection
- <a href="qmgr.8.html">qmgr(8)</a>, queue manager
- <a href="bounce.8.html">bounce(8)</a>, delivery status reports
- <a href="scache.8.html">scache(8)</a>, connection cache server
- <a href="postconf.5.html">postconf(5)</a>, configuration parameters
- <a href="master.5.html">master(5)</a>, generic daemon options
- <a href="master.8.html">master(8)</a>, process manager
- <a href="tlsmgr.8.html">tlsmgr(8)</a>, TLS session and PRNG management
- syslogd(8), system logging
-
-<b>README FILES</b>
- <a href="SASL_README.html">SASL_README</a>, Postfix SASL howto
- <a href="TLS_README.html">TLS_README</a>, Postfix STARTTLS howto
-
-<b>LICENSE</b>
- The Secure Mailer license must be distributed with this software.
-
-<b>AUTHOR(S)</b>
- Wietse Venema
- IBM T.J. Watson Research
- P.O. Box 704
- Yorktown Heights, NY 10598, USA
-
- Command pipelining in cooperation with:
- Jon Ribbens
- Oaktree Internet Solutions Ltd.,
- Internet House,
- Canal Basin,
- Coventry,
- CV1 4LY, United Kingdom.
-
- SASL support originally by:
- Till Franke
- SuSE Rhein/Main AG
- 65760 Eschborn, Germany
-
- TLS support originally by:
- Lutz Jaenicke
- BTU Cottbus
- Allgemeine Elektrotechnik
- Universitaetsplatz 3-4
- D-03044 Cottbus, Germany
-
- Revised TLS and SMTP connection cache support by:
- Victor Duchovni
- Morgan Stanley
-
- SMTP(8)
-</pre> </body> </html>
|
|
[-]
[+]
|
Changed |
_service:download_files:postfix-2.11.6.tar.gz/HISTORY
^
|
| @@ -19664,3 +19664,23 @@
Incompatibility: specifying "make makefiles" with "CC=command"
will no longer override the default WARN setting.
+
+20150501
+
+ Support for Linux 4.*, and some simplification for future
+ makedefs files. Files: makedefs, util/sys_defs.h.
+
+20150718
+
+ Security: opportunistic TLS by default uses "medium" or
+ stronger ciphers instead of "export" or stronger. See the
+ RELEASE_NOTES file for how to get the old settings back.
+ Files: global/mail_params.h, proto/TLS_README.html,
+ proto/postconf.proto, and files derived from those.
+
+20150719
+
+ Security: Postfix TLS support by default no longer uses
+ SSLv2 or SSLv3. See the RELEASE_NOTES file for how to get
+ the old settings back. Files: global/mail_params.h,
+ proto/postconf.proto, and files derived from those.
|
|
[-]
[+]
|
Changed |
_service:download_files:postfix-2.11.6.tar.gz/README_FILES/TLS_README
^
|
| @@ -569,13 +569,15 @@
SSeerrvveerr--ssiiddee cciipphheerr ccoonnttrroollss
-The Postfix SMTP server supports 5 distinct cipher security levels as specified
-by the smtpd_tls_mandatory_ciphers configuration parameter, which determines
-the cipher grade with mandatory TLS encryption. The default value is "medium"
-which is essentially 128-bit encryption or better. With opportunistic TLS
-encryption, the minimum accepted cipher grade is typically "export". The
-corresponding smtpd_tls_ciphers parameter (Postfix >= 2.6) controls the cipher
-grade used with opportunistic TLS.
+The Postfix SMTP server supports 5 distinct cipher grades as specified by the
+smtpd_tls_mandatory_ciphers configuration parameter, which determines the
+minimum cipher grade with mandatory TLS encryption. The default minimum cipher
+grade for mandatory TLS is "medium" which is essentially 128-bit encryption or
+better. The smtpd_tls_ciphers parameter (Postfix >= 2.6) controls the minimum
+cipher grade used with opportunistic TLS. Here, the default minimum cipher
+grade is "medium" for Postfix releases after the middle of 2015, "export" for
+older Postfix releases. With Postfix < 2.6, the minimum opportunistic TLS
+cipher grade is always "export".
By default anonymous ciphers are enabled. They are automatically disabled when
remote SMTP client certificates are requested. If clients are expected to
@@ -585,15 +587,12 @@
SMTP client to check the server certificate, so excluding anonymous ciphers is
generally unnecessary.
-The "smtpd_tls_ciphers" configuration parameter (Postfix >= 2.6) provides
-control over the minimum cipher grade for opportunistic TLS. With Postfix <
-2.6, the minimum opportunistic TLS cipher grade is always "export".
-
-With mandatory TLS encryption, the Postfix SMTP server will by default disable
-SSLv2. SSLv2 is used only when TLS encryption is optional. The mandatory TLS
+With mandatory and opportunistic TLS encryption, the Postfix SMTP server by
+default disables SSLv2 and SSLv3 with Postfix releases after the middle of
+2015; older releases only disable SSLv2 for mandatory TLS. The mandatory TLS
protocol list is specified via the smtpd_tls_mandatory_protocols configuration
-parameter. The corresponding smtpd_tls_protocols parameter (Postfix >= 2.6)
-controls the SSL/TLS protocols used with opportunistic TLS.
+parameter. The smtpd_tls_protocols parameter (Postfix >= 2.6) controls the SSL/
+TLS protocols used with opportunistic TLS.
Note that the OpenSSL library only supports protocol exclusion (not inclusion).
For this reason, Postfix can exclude only protocols that are known at the time
@@ -777,13 +776,10 @@
configured by setting "smtp_tls_security_level = may". For LMTP, use the
corresponding "lmtp_" parameter.
-Since sending in the clear is acceptable, demanding stronger than default TLS
-security mostly reduces inter-operability. If you must restrict TLS protocol or
-cipher selection even with opportunistic TLS, the "smtp_tls_ciphers" and
-"smtp_tls_protocols" configuration parameters (Postfix >= 2.6) provide control
-over the protocols and cipher grade used with opportunistic TLS. With earlier
-releases the opportunistic TLS cipher grade is always "export" and no protocols
-are disabled.
+The "smtp_tls_ciphers" and "smtp_tls_protocols" configuration parameters
+(Postfix >= 2.6) provide control over the cipher grade and protocols used with
+opportunistic TLS. With earlier Postfix releases, opportunistic TLS always uses
+the cipher grade "export" and enables all protocols.
With opportunistic TLS, mail delivery continues even if the server certificate
is untrusted or bears the wrong name. When the TLS handshake fails for an
@@ -844,7 +840,7 @@
In the example below, traffic to example.com and its sub-domains via the
corresponding MX hosts always uses TLS. The SSLv2 protocol will be disabled
-(the default setting of smtp_tls_mandatory_protocols excludes "SSLv2"). Only
+(the default setting of smtp_tls_mandatory_protocols excludes SSLv2+3). Only
high- or medium-strength (i.e. 128 bit or better) ciphers will be used by
default for all "encrypt" security level sessions.
@@ -1629,15 +1625,15 @@
TLSA records in DNSSEC. If no TLSA records are found, the effective
security level used is may. If TLSA records are found, but none are usable,
the effective security level is encrypt. When usable TLSA records are
- obtained for the remote SMTP server, SSLv2 is automatically disabled (see
- smtp_tls_mandatory_protocols), and the server certificate must match the
- TLSA records. RFC 6698 (DANE) TLS authentication and DNSSEC support is
+ obtained for the remote SMTP server, SSLv2+3 are automatically disabled
+ (see smtp_tls_mandatory_protocols), and the server certificate must match
+ the TLSA records. RFC 6698 (DANE) TLS authentication and DNSSEC support is
available with Postfix 2.11 and later.
ddaannee--oonnllyy
Mandatory DANE TLS. The TLS policy for the destination is obtained via TLSA
records in DNSSEC. If no TLSA records are found, or none are usable, no
connection is made to the server. When usable TLSA records are obtained for
- the remote SMTP server, SSLv2 is automatically disabled (see
+ the remote SMTP server, SSLv2+3 are automatically disabled (see
smtp_tls_mandatory_protocols), and the server certificate must match the
TLSA records. RFC 6698 (DANE) TLS authentication and DNSSEC support is
available with Postfix 2.11 and later.
@@ -1768,13 +1764,13 @@
CClliieenntt--ssiiddee cciipphheerr ccoonnttrroollss
-The Postfix SMTP client supports 5 distinct cipher security levels as specified
-by the smtp_tls_mandatory_ciphers configuration parameter. This setting
-controls the minimum acceptable SMTP client TLS cipher grade for use with
-mandatory TLS encryption. The default value "medium" is suitable for most
-destinations with which you may want to enforce TLS, and is beyond the reach of
-today's cryptanalytic methods. See smtp_tls_policy_maps for information on how
-to configure ciphers on a per-destination basis.
+The Postfix SMTP client supports 5 distinct cipher grades as specified by the
+smtp_tls_mandatory_ciphers configuration parameter. This setting controls the
+minimum acceptable SMTP client TLS cipher grade for use with mandatory TLS
+encryption. The default value "medium" is suitable for most destinations with
+which you may want to enforce TLS, and is beyond the reach of today's
+cryptanalytic methods. See smtp_tls_policy_maps for information on how to
+configure ciphers on a per-destination basis.
By default anonymous ciphers are allowed, and automatically disabled when
remote SMTP server certificates are verified. If you want to disable anonymous
@@ -1786,14 +1782,16 @@
requesting them.
The "smtp_tls_ciphers" configuration parameter (Postfix >= 2.6) provides
-control over the minimum cipher grade for opportunistic TLS. With Postfix <
-2.6, the minimum opportunistic TLS cipher grade is always "export".
-
-With mandatory TLS encryption, the Postfix SMTP client will by default disable
-SSLv2. SSLv2 is used only when TLS encryption is optional. The mandatory TLS
-protocol list is specified via the smtp_tls_mandatory_protocols configuration
-parameter. The corresponding smtp_tls_protocols parameter (Postfix >= 2.6)
-controls the SSL/TLS protocols used with opportunistic TLS.
+control over the minimum cipher grade for opportunistic TLS. The default
+minimum cipher grade for opportunistic TLS is "medium" for Postfix releases
+after the middle of 2015, and "export" for older releases. With Postfix < 2.6,
+the minimum opportunistic TLS cipher grade is always "export".
+
+With mandatory and opportunistic TLS encryption, the Postfix SMTP client will
+by default disable SSLv2 and SSLv3. The mandatory TLS protocol list is
+specified via the smtp_tls_mandatory_protocols configuration parameter. The
+corresponding smtp_tls_protocols parameter (Postfix >= 2.6) controls the SSL/
+TLS protocols used with opportunistic TLS.
Example:
@@ -1806,7 +1804,7 @@
# Legacy form for Postfix < 2.5:
smtp_tls_mandatory_protocols = SSLv3, TLSv1
# Also available with Postfix >= 2.6:
- smtp_tls_ciphers = export
+ smtp_tls_ciphers = medium
smtp_tls_protocols = !SSLv2
CClliieenntt--ssiiddee SSMMTTPPSS ssuuppppoorrtt
|
|
[-]
[+]
|
Changed |
_service:download_files:postfix-2.11.6.tar.gz/RELEASE_NOTES
^
|
| @@ -14,6 +14,40 @@
If you upgrade from Postfix 2.9 or earlier, read RELEASE_NOTES-2.10
before proceeding.
+Incompatible change with Postfix 2.11.6
+---------------------------------------
+
+As of the middle of 2015, all supported Postfix releases no longer
+enable "export" grade ciphers for opportunistic TLS, and no longer
+use the deprecated SSLv2 and SSLv3 protocols for mandatory or
+opportunistic TLS.
+
+These changes are very unlikely to cause problems with server-to-server
+communication over the Internet, but they may result in interoperability
+problems with ancient client or server implementations on internal
+networks. To address this problem, you can revert the changes with:
+
+Postfix SMTP client settings:
+
+ lmtp_tls_ciphers = export
+ smtp_tls_ciphers = export
+ lmtp_tls_protocols = !SSLv2
+ smtp_tls_protocols = !SSLv2
+ lmtp_tls_mandatory_protocols = !SSLv2
+ smtp_tls_mandatory_protocols = !SSLv2
+
+Postfix SMTP server settings:
+
+ smtpd_tls_ciphers = export
+ smtpd_tls_protocols =
+ smtpd_tls_mandatory_protocols = !SSLv2
+
+These settings, if put in main.cf, affect all Postfix SMTP client
+or server communication, which may be undesirable. To be more
+selective, use "-o name=value" parameter overrides on specific
+services in master.cf. Execute the command "postfix reload" to make
+the changes effective.
+
Major changes - tls
-------------------
|
|
[-]
[+]
|
Changed |
_service:download_files:postfix-2.11.6.tar.gz/html/TLS_README.html
^
|
| @@ -810,14 +810,16 @@
<h3><a name="server_cipher">Server-side cipher controls</a> </h3>
-<p> The Postfix SMTP server supports 5 distinct cipher security levels
-as specified by the <a href="postconf.5.html#smtpd_tls_mandatory_ciphers">smtpd_tls_mandatory_ciphers</a> configuration parameter,
-which determines the cipher grade with mandatory TLS encryption. The
-default value is "medium" which is essentially 128-bit encryption or better.
-With opportunistic TLS encryption, the minimum accepted cipher grade is
-typically "export". The corresponding <a href="postconf.5.html#smtpd_tls_ciphers">smtpd_tls_ciphers</a> parameter
-(Postfix ≥ 2.6) controls the cipher grade used with opportunistic
-TLS. </p>
+<p> The Postfix SMTP server supports 5 distinct cipher grades as
+specified by the <a href="postconf.5.html#smtpd_tls_mandatory_ciphers">smtpd_tls_mandatory_ciphers</a> configuration parameter,
+which determines the minimum cipher grade with mandatory TLS
+encryption. The default minimum cipher grade for mandatory TLS is
+"medium" which is essentially 128-bit encryption or better. The
+<a href="postconf.5.html#smtpd_tls_ciphers">smtpd_tls_ciphers</a> parameter (Postfix ≥ 2.6) controls the minimum
+cipher grade used with opportunistic TLS. Here, the default minimum
+cipher grade is "medium" for Postfix releases after the middle of
+2015, "export" for older Postfix releases. With Postfix < 2.6,
+the minimum opportunistic TLS cipher grade is always "export". </p>
<p> By default anonymous ciphers are enabled. They are automatically
disabled when remote SMTP client certificates are requested. If
@@ -828,17 +830,12 @@
a remote SMTP client to check the server certificate, so excluding
anonymous ciphers is generally unnecessary. </p>
-<p> The "<a href="postconf.5.html#smtpd_tls_ciphers">smtpd_tls_ciphers</a>" configuration parameter (Postfix ≥
-2.6) provides control over the minimum cipher grade for opportunistic
-TLS. With
-Postfix < 2.6, the minimum opportunistic TLS cipher grade is always
-"export". </p>
-
-<p> With mandatory TLS encryption, the Postfix SMTP server will by
-default disable SSLv2. SSLv2 is used only when TLS encryption
-is optional. The mandatory TLS protocol list is specified via the
+<p> With mandatory and opportunistic TLS encryption, the Postfix
+SMTP server by default disables SSLv2 and SSLv3 with Postfix releases
+after the middle of 2015; older releases only disable SSLv2 for
+mandatory TLS. The mandatory TLS protocol list is specified via the
<a href="postconf.5.html#smtpd_tls_mandatory_protocols">smtpd_tls_mandatory_protocols</a> configuration parameter. The
-corresponding <a href="postconf.5.html#smtpd_tls_protocols">smtpd_tls_protocols</a> parameter (Postfix ≥ 2.6)
+<a href="postconf.5.html#smtpd_tls_protocols">smtpd_tls_protocols</a> parameter (Postfix ≥ 2.6)
controls the SSL/TLS protocols used with opportunistic TLS. </p>
<p> Note that the OpenSSL library only supports protocol exclusion
@@ -1080,14 +1077,11 @@
Opportunistic TLS can be configured by setting "<a href="postconf.5.html#smtp_tls_security_level">smtp_tls_security_level</a> = may".
For LMTP, use the corresponding "lmtp_" parameter. </p>
-<p> Since sending in the clear is acceptable, demanding stronger
-than default TLS security mostly reduces inter-operability. If you
-must restrict TLS protocol or cipher selection even with opportunistic
-TLS, the "<a href="postconf.5.html#smtp_tls_ciphers">smtp_tls_ciphers</a>" and "<a href="postconf.5.html#smtp_tls_protocols">smtp_tls_protocols</a>" configuration
-parameters (Postfix ≥ 2.6) provide control over the protocols
-and cipher grade
-used with opportunistic TLS. With earlier releases the opportunistic TLS
-cipher grade is always "export" and no protocols are disabled. </p>
+<p> The "<a href="postconf.5.html#smtp_tls_ciphers">smtp_tls_ciphers</a>" and "<a href="postconf.5.html#smtp_tls_protocols">smtp_tls_protocols</a>" configuration
+parameters (Postfix ≥ 2.6) provide control over the cipher grade
+and protocols used with opportunistic TLS. With earlier Postfix
+releases, opportunistic TLS always uses the cipher grade "export"
+and enables all protocols. </p>
<p> With opportunistic TLS, mail delivery continues even if the
server certificate is untrusted or bears the wrong name.
@@ -1163,7 +1157,7 @@
<p> In the example below, traffic to <i>example.com</i> and its sub-domains
via the corresponding MX hosts always uses TLS. The SSLv2 protocol
will be disabled (the default setting of <a href="postconf.5.html#smtp_tls_mandatory_protocols">smtp_tls_mandatory_protocols</a>
-excludes "SSLv2"). Only high- or medium-strength (i.e. 128 bit or
+excludes SSLv2+3). Only high- or medium-strength (i.e. 128 bit or
better) ciphers will be used by default for all "encrypt" security
level sessions. </p>
@@ -2143,7 +2137,7 @@
used is <a href="#client_tls_may">may</a>. If TLSA records are
found, but none are usable, the effective security level is <a
href="#client_tls_encrypt">encrypt</a>. When usable TLSA records
-are obtained for the remote SMTP server, SSLv2 is automatically
+are obtained for the remote SMTP server, SSLv2+3 are automatically
disabled (see <a href="postconf.5.html#smtp_tls_mandatory_protocols">smtp_tls_mandatory_protocols</a>), and the server certificate
must match the TLSA records. <a href="http://tools.ietf.org/html/rfc6698">RFC 6698</a> (DANE) TLS authentication
and DNSSEC support is available with Postfix 2.11 and later. </dd>
@@ -2152,7 +2146,7 @@
The TLS policy for the destination is obtained via TLSA records in
DNSSEC. If no TLSA records are found, or none are usable, no
connection is made to the server. When usable TLSA records are
-obtained for the remote SMTP server, SSLv2 is automatically disabled
+obtained for the remote SMTP server, SSLv2+3 are automatically disabled
(see <a href="postconf.5.html#smtp_tls_mandatory_protocols">smtp_tls_mandatory_protocols</a>), and the server certificate must
match the TLSA records. <a href="http://tools.ietf.org/html/rfc6698">RFC 6698</a> (DANE) TLS authentication and
DNSSEC support is available with Postfix 2.11 and later. </dd>
@@ -2318,7 +2312,7 @@
<h3> <a name="client_cipher">Client-side cipher controls </a> </h3>
-<p> The Postfix SMTP client supports 5 distinct cipher security levels
+<p> The Postfix SMTP client supports 5 distinct cipher grades
as specified by the <a href="postconf.5.html#smtp_tls_mandatory_ciphers">smtp_tls_mandatory_ciphers</a> configuration
parameter. This setting controls the minimum acceptable SMTP client
TLS cipher grade for use with mandatory TLS encryption. The default
@@ -2339,13 +2333,15 @@
little point in requesting them. </p>
<p> The "<a href="postconf.5.html#smtp_tls_ciphers">smtp_tls_ciphers</a>" configuration parameter (Postfix ≥ 2.6)
-provides control over the minimum cipher grade for opportunistic TLS. With
-Postfix < 2.6, the minimum opportunistic TLS cipher grade is always
-"export". </p>
-
-<p> With mandatory TLS encryption, the Postfix SMTP client will by
-default disable SSLv2. SSLv2 is used only when TLS encryption
-is optional. The mandatory TLS protocol list is specified via the
+provides control over the minimum cipher grade for opportunistic TLS.
+The default minimum cipher grade for opportunistic TLS is "medium"
+for Postfix releases after the middle of 2015, and "export" for
+older releases. With Postfix < 2.6, the minimum opportunistic
+TLS cipher grade is always "export". </p>
+
+<p> With mandatory and opportunistic TLS encryption, the Postfix
+SMTP client will by default disable SSLv2 and SSLv3. The mandatory
+TLS protocol list is specified via the
<a href="postconf.5.html#smtp_tls_mandatory_protocols">smtp_tls_mandatory_protocols</a> configuration parameter. The corresponding
<a href="postconf.5.html#smtp_tls_protocols">smtp_tls_protocols</a> parameter (Postfix ≥ 2.6) controls
the SSL/TLS protocols used with opportunistic TLS. </p>
@@ -2363,7 +2359,7 @@
# Legacy form for Postfix < 2.5:
<a href="postconf.5.html#smtp_tls_mandatory_protocols">smtp_tls_mandatory_protocols</a> = SSLv3, TLSv1
# Also available with Postfix ≥ 2.6:
- <a href="postconf.5.html#smtp_tls_ciphers">smtp_tls_ciphers</a> = export
+ <a href="postconf.5.html#smtp_tls_ciphers">smtp_tls_ciphers</a> = medium
<a href="postconf.5.html#smtp_tls_protocols">smtp_tls_protocols</a> = !SSLv2
</pre>
</blockquote>
|
|
[-]
[+]
|
Changed |
_service:download_files:postfix-2.11.6.tar.gz/html/postconf.5.html
^
|
| @@ -4727,7 +4727,7 @@
</DD>
<DT><b><a name="lmtp_tls_ciphers">lmtp_tls_ciphers</a>
-(default: export)</b></DT><DD>
+(default: medium)</b></DT><DD>
<p> The LMTP-specific version of the <a href="postconf.5.html#smtp_tls_ciphers">smtp_tls_ciphers</a> configuration
parameter. See there for details. </p>
@@ -4861,7 +4861,7 @@
</DD>
<DT><b><a name="lmtp_tls_mandatory_ciphers">lmtp_tls_mandatory_ciphers</a>
-(default: empty)</b></DT><DD>
+(default: medium)</b></DT><DD>
<p> The LMTP-specific version of the <a href="postconf.5.html#smtp_tls_mandatory_ciphers">smtp_tls_mandatory_ciphers</a>
configuration parameter. See there for details. </p>
@@ -4883,7 +4883,7 @@
</DD>
<DT><b><a name="lmtp_tls_mandatory_protocols">lmtp_tls_mandatory_protocols</a>
-(default: !SSLv2)</b></DT><DD>
+(default: !SSLv2, !SSLv3)</b></DT><DD>
<p> The LMTP-specific version of the <a href="postconf.5.html#smtp_tls_mandatory_protocols">smtp_tls_mandatory_protocols</a>
configuration parameter. See there for details. </p>
@@ -4927,7 +4927,7 @@
</DD>
<DT><b><a name="lmtp_tls_protocols">lmtp_tls_protocols</a>
-(default: empty)</b></DT><DD>
+(default: !SSLv2, !SSLv3)</b></DT><DD>
<p> The LMTP-specific version of the <a href="postconf.5.html#smtp_tls_protocols">smtp_tls_protocols</a> configuration
parameter. See there for details. </p>
@@ -10995,26 +10995,20 @@
</DD>
<DT><b><a name="smtp_tls_ciphers">smtp_tls_ciphers</a>
-(default: export)</b></DT><DD>
+(default: medium)</b></DT><DD>
<p> The minimum TLS cipher grade that the Postfix SMTP client
will use with opportunistic TLS encryption. Cipher types listed in
<a href="postconf.5.html#smtp_tls_exclude_ciphers">smtp_tls_exclude_ciphers</a> are excluded from the base definition of
-the selected cipher grade. The default value "export" ensures maximum
-inter-operability. Because encryption is optional, stronger controls
-are not appropriate, and this setting SHOULD NOT be changed unless the
-change is essential. </p>
+the selected cipher grade. The default value is "medium" for
+Postfix releases after the middle of 2015, "export" for older
+releases. </p>
<p> When TLS is mandatory the cipher grade is chosen via the
<a href="postconf.5.html#smtp_tls_mandatory_ciphers">smtp_tls_mandatory_ciphers</a> configuration parameter, see there for syntax
details. See <a href="postconf.5.html#smtp_tls_policy_maps">smtp_tls_policy_maps</a> for information on how to configure
ciphers on a per-destination basis. </p>
-<p> Example: </p>
-<pre>
-<a href="postconf.5.html#smtp_tls_ciphers">smtp_tls_ciphers</a> = export
-</pre>
-
<p> This feature is available in Postfix 2.6 and later. With earlier Postfix
releases only the <a href="postconf.5.html#smtp_tls_mandatory_ciphers">smtp_tls_mandatory_ciphers</a> parameter is implemented,
and opportunistic TLS always uses "export" or better (i.e. all) ciphers. </p>
@@ -11403,18 +11397,16 @@
<dl>
<dt><b>export</b></dt>
-<dd> Enable "EXPORT" grade or better OpenSSL
-ciphers. This is the default for opportunistic encryption. It is
-not recommended for mandatory encryption unless you must enforce TLS
-with "crippled" peers. The underlying cipherlist is specified via the
-<a href="postconf.5.html#tls_export_cipherlist">tls_export_cipherlist</a> configuration parameter, which you are strongly
-encouraged to not change. </dd>
+<dd> Enable "EXPORT" grade or better OpenSSL ciphers. The underlying
+cipherlist is specified via the <a href="postconf.5.html#tls_export_cipherlist">tls_export_cipherlist</a> configuration
+parameter, which you are strongly encouraged to not change. This
+choice is insecure and SHOULD NOT be used. </dd>
<dt><b>low</b></dt>
-<dd> Enable "LOW" grade or better OpenSSL ciphers. This
-setting is only appropriate for internal mail servers. The underlying
+<dd> Enable "LOW" grade or better OpenSSL ciphers. The underlying
cipherlist is specified via the <a href="postconf.5.html#tls_low_cipherlist">tls_low_cipherlist</a> configuration
-parameter, which you are strongly encouraged to not change. </dd>
+parameter, which you are strongly encouraged to not change. This
+choice is insecure and SHOULD NOT be used. </dd>
<dt><b>medium</b></dt>
<dd> Enable "MEDIUM" grade or better OpenSSL ciphers.
@@ -11475,14 +11467,16 @@
</DD>
<DT><b><a name="smtp_tls_mandatory_protocols">smtp_tls_mandatory_protocols</a>
-(default: !SSLv2)</b></DT><DD>
+(default: !SSLv2, !SSLv3)</b></DT><DD>
<p> List of SSL/TLS protocols that the Postfix SMTP client will use with
mandatory TLS encryption. In <a href="postconf.5.html">main.cf</a> the values are separated by
whitespace, commas or colons. In the policy table "protocols" attribute
(see <a href="postconf.5.html#smtp_tls_policy_maps">smtp_tls_policy_maps</a>) the only valid separator is colon. An
empty value means allow all protocols. The valid protocol names, (see
-<b>SSL_get_version(3)</b>), are "SSLv2", "SSLv3" and "TLSv1". </p>
+<b>SSL_get_version(3)</b>), are "SSLv2", "SSLv3" and "TLSv1". The
+default value is "!SSLv2, !SSLv3" for Postfix releases after the
+middle of 2015, "!SSLv2" for older releases. </p>
<p> With Postfix ≥ 2.5 the parameter syntax was expanded to support
protocol exclusions. One can explicitly exclude "SSLv2" by setting
@@ -11525,11 +11519,6 @@
TLSv1, except perhaps via the policy table for destinations which
you are sure will support "TLSv1.1" or "TLSv1.2". </p>
-<p> Since SSL version 2 has known protocol weaknesses and is now
-deprecated, the default setting excludes "SSLv2". This means that by
-default, SSL version 2 will not be used at the "encrypt" security level
-and higher. </p>
-
<p> See the documentation of the <a href="postconf.5.html#smtp_tls_policy_maps">smtp_tls_policy_maps</a> parameter and
<a href="TLS_README.html">TLS_README</a> for more information about security levels. </p>
@@ -11808,12 +11797,13 @@
</DD>
<DT><b><a name="smtp_tls_protocols">smtp_tls_protocols</a>
-(default: !SSLv2)</b></DT><DD>
+(default: !SSLv2, !SSLv3)</b></DT><DD>
<p> List of TLS protocols that the Postfix SMTP client will exclude or
-include with opportunistic TLS encryption. Starting with Postfix 2.6,
-the Postfix SMTP client will by default not use the obsolete SSLv2
-protocol. </p>
+include with opportunistic TLS encryption. The default value is
+"!SSLv2, !SSLv3" for Postfix releases after the middle of 2015,
+"!SSLv2" for older releases. Before Postfix 2.6, the Postfix SMTP
+client would use all protocols with opportunistic TLS. </p>
<p> In <a href="postconf.5.html">main.cf</a> the values are separated by whitespace, commas or
colons. In the policy table (see <a href="postconf.5.html#smtp_tls_policy_maps">smtp_tls_policy_maps</a>) the only valid
@@ -11839,7 +11829,7 @@
"TLSv1.1" or "TLSv1.2"</p>
<p> To include a protocol list its name, to exclude it, prefix the name
-with a "!" character. To exclude SSLv2 even for opportunistic TLS set
+with a "!" character. To exclude SSLv2 for opportunistic TLS set
"<a href="postconf.5.html#smtp_tls_protocols">smtp_tls_protocols</a> = !SSLv2". To exclude both "SSLv2" and "SSLv3" set
"<a href="postconf.5.html#smtp_tls_protocols">smtp_tls_protocols</a> = !SSLv2, !SSLv3". Explicitly listing the protocols to
include, rather than protocols to exclude, is supported, but not
@@ -12046,7 +12036,7 @@
# can be mitigated by disabling a particular protocol or raising the
# cipher grade from "export" to "low" or "medium").
<a href="postconf.5.html#smtp_tls_ciphers">smtp_tls_ciphers</a> = export
-<a href="postconf.5.html#smtp_tls_protocols">smtp_tls_protocols</a> = !SSLv2
+<a href="postconf.5.html#smtp_tls_protocols">smtp_tls_protocols</a> = !SSLv2, !SSLv3
</pre>
<pre>
@@ -15180,25 +15170,19 @@
</DD>
<DT><b><a name="smtpd_tls_ciphers">smtpd_tls_ciphers</a>
-(default: export)</b></DT><DD>
+(default: medium)</b></DT><DD>
<p> The minimum TLS cipher grade that the Postfix SMTP server
will use with opportunistic TLS encryption. Cipher types listed in
<a href="postconf.5.html#smtpd_tls_exclude_ciphers">smtpd_tls_exclude_ciphers</a> are excluded from the base definition of
-the selected cipher grade. The default value "export" ensures maximum
-inter-operability. Because encryption is optional, stronger controls
-are not appropriate, and this setting SHOULD NOT be changed unless the
-change is essential. </p>
+the selected cipher grade. The default value is "medium" for Postfix
+releases after the middle of 2015, "export" for older releases.
+</p>
<p> When TLS is mandatory the cipher grade is chosen via the
<a href="postconf.5.html#smtpd_tls_mandatory_ciphers">smtpd_tls_mandatory_ciphers</a> configuration parameter, see there for syntax
details. </p>
-<p> Example: </p>
-<pre>
-<a href="postconf.5.html#smtpd_tls_ciphers">smtpd_tls_ciphers</a> = export
-</pre>
-
<p> This feature is available in Postfix 2.6 and later. With earlier Postfix
releases only the <a href="postconf.5.html#smtpd_tls_mandatory_ciphers">smtpd_tls_mandatory_ciphers</a> parameter is implemented,
and opportunistic TLS always uses "export" or better (i.e. all) ciphers. </p>
@@ -15599,17 +15583,16 @@
<dl>
<dt><b>export</b></dt>
-<dd> Enable "EXPORT" grade or stronger OpenSSL ciphers.
-This is the most appropriate setting for public MX hosts, and is always
-used with opportunistic TLS encryption. The underlying cipherlist
-is specified via the <a href="postconf.5.html#tls_export_cipherlist">tls_export_cipherlist</a> configuration parameter,
-which you are strongly encouraged to not change. </dd>
+<dd> Enable "EXPORT" grade or stronger OpenSSL ciphers. The
+underlying cipherlist is specified via the <a href="postconf.5.html#tls_export_cipherlist">tls_export_cipherlist</a>
+configuration parameter, which you are strongly encouraged to not
+change. This choice is insecure and SHOULD NOT be used. </dd>
<dt><b>low</b></dt>
-<dd> Enable "LOW" grade or stronger OpenSSL ciphers. The
-underlying cipherlist is specified via the <a href="postconf.5.html#tls_low_cipherlist">tls_low_cipherlist</a>
-configuration parameter, which you are strongly encouraged to
-not change. </dd>
+<dd> Enable "LOW" grade or stronger OpenSSL ciphers. The underlying
+cipherlist is specified via the <a href="postconf.5.html#tls_low_cipherlist">tls_low_cipherlist</a> configuration
+parameter, which you are strongly encouraged to not change. This
+choice is insecure and SHOULD NOT be used. </dd>
<dt><b>medium</b></dt>
<dd> Enable "MEDIUM" grade or stronger OpenSSL ciphers. These use 128-bit
@@ -15669,14 +15652,16 @@
</DD>
<DT><b><a name="smtpd_tls_mandatory_protocols">smtpd_tls_mandatory_protocols</a>
-(default: !SSLv2)</b></DT><DD>
+(default: !SSLv2, !SSLv3)</b></DT><DD>
<p> The SSL/TLS protocols accepted by the Postfix SMTP server with
mandatory TLS encryption. If the list is empty, the server supports
all available SSL/TLS protocol versions. A non-empty value is a
list of protocol names separated by whitespace, commas or colons.
The supported protocol names are "SSLv2", "SSLv3" and "TLSv1", and
-are not case sensitive. </p>
+are not case sensitive. The default value is "!SSLv2, !SSLv3" for
+Postfix releases after the middle of 2015, "!SSLv2" for older
+releases. </p>
<p> With Postfix ≥ 2.5 the parameter syntax was expanded to support
protocol exclusions. One can explicitly exclude "SSLv2" by setting
@@ -15693,11 +15678,6 @@
versions of Postfix ≥ 2.10 can disable support for "TLSv1.1" or
"TLSv1.2". </p>
-<p> Since SSL version 2 has known protocol weaknesses and is now
-deprecated, the default setting excludes "SSLv2". This means that
-by default, SSL version 2 will not be used at the "encrypt" security
-level. </p>
-
<p> Example: </p>
<pre>
@@ -15713,11 +15693,12 @@
</DD>
<DT><b><a name="smtpd_tls_protocols">smtpd_tls_protocols</a>
-(default: empty)</b></DT><DD>
+(default: !SSLv2, !SSLv3)</b></DT><DD>
<p> List of TLS protocols that the Postfix SMTP server will exclude
-or include with opportunistic TLS encryption. This parameter SHOULD
-be left at its default empty value, allowing all protocols to be
+or include with opportunistic TLS encryption. The default value is
+"!SSLv2, !SSLv3" for Postfix releases after the middle of 2015,
+empty for older releases allowing all protocols to be
used with opportunistic TLS. A non-empty value is a list of protocol
names separated by whitespace, commas or colons. The supported
protocol names are "SSLv2", "SSLv3" and "TLSv1", and are not case
@@ -15729,7 +15710,7 @@
"TLSv1.2". </p>
<p> To include a protocol list its name, to exclude it, prefix the name
-with a "!" character. To exclude SSLv2 even for opportunistic TLS set
+with a "!" character. To exclude SSLv2 for opportunistic TLS set
"<a href="postconf.5.html#smtpd_tls_protocols">smtpd_tls_protocols</a> = !SSLv2". To exclude both "SSLv2" and "SSLv3" set
"<a href="postconf.5.html#smtpd_tls_protocols">smtpd_tls_protocols</a> = !SSLv2, !SSLv3". Explicitly listing the protocols to
include, rather than protocols to exclude, is supported, but not
@@ -15738,7 +15719,7 @@
<p> Example: </p>
<pre>
-<a href="postconf.5.html#smtpd_tls_protocols">smtpd_tls_protocols</a> = !SSLv2
+<a href="postconf.5.html#smtpd_tls_protocols">smtpd_tls_protocols</a> = !SSLv2, !SSLv3
</pre>
<p> This feature is available in Postfix 2.6 and later. </p>
@@ -16576,15 +16557,13 @@
(default: ALL:+RC4:@STRENGTH)</b></DT><DD>
<p> The OpenSSL cipherlist for "EXPORT" or higher grade ciphers. This
-defines the meaning of the "export" setting in <a href="postconf.5.html#smtpd_tls_mandatory_ciphers">smtpd_tls_mandatory_ciphers</a>,
-<a href="postconf.5.html#smtp_tls_mandatory_ciphers">smtp_tls_mandatory_ciphers</a> and <a href="postconf.5.html#lmtp_tls_mandatory_ciphers">lmtp_tls_mandatory_ciphers</a>. This is
-the cipherlist for the opportunistic ("may") TLS client security
-level and is the default cipherlist for the SMTP server. You are
-strongly encouraged to not change this setting. With OpenSSL 1.0.0 and
-later the cipherlist may start with an "aNULL:" prefix, which restores
-the 0.9.8-compatible ordering of the aNULL ciphers to the top of the
-list when they are enabled. This prefix is not needed with previous
-OpenSSL releases. </p>
+defines the meaning of the "export" setting in <a href="postconf.5.html#smtpd_tls_ciphers">smtpd_tls_ciphers</a>,
+<a href="postconf.5.html#smtpd_tls_mandatory_ciphers">smtpd_tls_mandatory_ciphers</a>, <a href="postconf.5.html#smtp_tls_ciphers">smtp_tls_ciphers</a>, <a href="postconf.5.html#smtp_tls_mandatory_ciphers">smtp_tls_mandatory_ciphers</a>,
+<a href="postconf.5.html#lmtp_tls_ciphers">lmtp_tls_ciphers</a>, and <a href="postconf.5.html#lmtp_tls_mandatory_ciphers">lmtp_tls_mandatory_ciphers</a>. With Postfix
+releases before the middle of 2015 this is the default cipherlist
+for the opportunistic ("may") TLS client security level and also
+the default cipherlist for the SMTP server. You are strongly
+encouraged to not change this setting. </p>
<p> This feature is available in Postfix 2.3 and later. </p>
@@ -16595,13 +16574,10 @@
(default: ALL:!EXPORT:!LOW:!MEDIUM:+RC4:@STRENGTH)</b></DT><DD>
<p> The OpenSSL cipherlist for "HIGH" grade ciphers. This defines
-the meaning of the "high" setting in <a href="postconf.5.html#smtpd_tls_mandatory_ciphers">smtpd_tls_mandatory_ciphers</a>,
-<a href="postconf.5.html#smtp_tls_mandatory_ciphers">smtp_tls_mandatory_ciphers</a> and <a href="postconf.5.html#lmtp_tls_mandatory_ciphers">lmtp_tls_mandatory_ciphers</a>. You are
-strongly encouraged to not change this setting. With OpenSSL 1.0.0 and
-later the cipherlist may start with an "aNULL:" prefix, which restores
-the 0.9.8-compatible ordering of the aNULL ciphers to the top of the
-list when they are enabled. This prefix is not needed with previous
-OpenSSL releases. </p>
+the meaning of the "high" setting in <a href="postconf.5.html#smtpd_tls_ciphers">smtpd_tls_ciphers</a>,
+<a href="postconf.5.html#smtpd_tls_mandatory_ciphers">smtpd_tls_mandatory_ciphers</a>, <a href="postconf.5.html#smtp_tls_ciphers">smtp_tls_ciphers</a>, <a href="postconf.5.html#smtp_tls_mandatory_ciphers">smtp_tls_mandatory_ciphers</a>,
+<a href="postconf.5.html#lmtp_tls_ciphers">lmtp_tls_ciphers</a>, and <a href="postconf.5.html#lmtp_tls_mandatory_ciphers">lmtp_tls_mandatory_ciphers</a>. You are strongly
+encouraged to not change this setting. </p>
<p> This feature is available in Postfix 2.3 and later. </p>
@@ -16631,13 +16607,10 @@
(default: ALL:!EXPORT:+RC4:@STRENGTH)</b></DT><DD>
<p> The OpenSSL cipherlist for "LOW" or higher grade ciphers. This defines
-the meaning of the "low" setting in <a href="postconf.5.html#smtpd_tls_mandatory_ciphers">smtpd_tls_mandatory_ciphers</a>,
-<a href="postconf.5.html#smtp_tls_mandatory_ciphers">smtp_tls_mandatory_ciphers</a> and <a href="postconf.5.html#lmtp_tls_mandatory_ciphers">lmtp_tls_mandatory_ciphers</a>. You are
-strongly encouraged to not change this setting. With OpenSSL 1.0.0 and
-later the cipherlist may start with an "aNULL:" prefix, which restores
-the 0.9.8-compatible ordering of the aNULL ciphers to the top of the
-list when they are enabled. This prefix is not needed with previous
-OpenSSL releases. </p>
+the meaning of the "low" setting in <a href="postconf.5.html#smtpd_tls_ciphers">smtpd_tls_ciphers</a>,
+<a href="postconf.5.html#smtpd_tls_mandatory_ciphers">smtpd_tls_mandatory_ciphers</a>, <a href="postconf.5.html#smtp_tls_ciphers">smtp_tls_ciphers</a>, <a href="postconf.5.html#smtp_tls_mandatory_ciphers">smtp_tls_mandatory_ciphers</a>,
+<a href="postconf.5.html#lmtp_tls_ciphers">lmtp_tls_ciphers</a>, and <a href="postconf.5.html#lmtp_tls_mandatory_ciphers">lmtp_tls_mandatory_ciphers</a>. You are strongly
+encouraged to not change this setting. </p>
<p> This feature is available in Postfix 2.3 and later. </p>
@@ -16648,15 +16621,14 @@
(default: ALL:!EXPORT:!LOW:+RC4:@STRENGTH)</b></DT><DD>
<p> The OpenSSL cipherlist for "MEDIUM" or higher grade ciphers. This
-defines the meaning of the "medium" setting in <a href="postconf.5.html#smtpd_tls_mandatory_ciphers">smtpd_tls_mandatory_ciphers</a>,
-<a href="postconf.5.html#smtp_tls_mandatory_ciphers">smtp_tls_mandatory_ciphers</a> and <a href="postconf.5.html#lmtp_tls_mandatory_ciphers">lmtp_tls_mandatory_ciphers</a>. This is
-the default cipherlist for mandatory TLS encryption in the TLS
-client (with anonymous ciphers disabled when verifying server
-certificates). You are strongly encouraged to not change this
-setting. With OpenSSL 1.0.0 and later the cipherlist may start with an
-"aNULL:" prefix, which restores the 0.9.8-compatible ordering of the
-aNULL ciphers to the top of the list when they are enabled. This prefix
-is not needed with previous OpenSSL releases. </p>
+defines the meaning of the "medium" setting in <a href="postconf.5.html#smtpd_tls_ciphers">smtpd_tls_ciphers</a>,
+<a href="postconf.5.html#smtpd_tls_mandatory_ciphers">smtpd_tls_mandatory_ciphers</a>, <a href="postconf.5.html#smtp_tls_ciphers">smtp_tls_ciphers</a>, <a href="postconf.5.html#smtp_tls_mandatory_ciphers">smtp_tls_mandatory_ciphers</a>,
+<a href="postconf.5.html#lmtp_tls_ciphers">lmtp_tls_ciphers</a>, and <a href="postconf.5.html#lmtp_tls_mandatory_ciphers">lmtp_tls_mandatory_ciphers</a>. This is the
+default cipherlist for mandatory TLS encryption in the TLS client
+(with anonymous ciphers disabled when verifying server certificates).
+This is the default cipherlist for opportunistic TLS with Postfix
+releases after the middle of 2015. You are strongly encouraged to
+not change this setting. </p>
<p> This feature is available in Postfix 2.3 and later. </p>
|
|
[-]
[+]
|
Changed |
_service:download_files:postfix-2.11.6.tar.gz/html/smtp.8.html
^
|
| @@ -432,7 +432,7 @@
policy by next-hop destination; when a non-empty value is speci-
fied, this overrides the obsolete <a href="postconf.5.html#smtp_tls_per_site">smtp_tls_per_site</a> parameter.
- <b><a href="postconf.5.html#smtp_tls_mandatory_protocols">smtp_tls_mandatory_protocols</a> (!SSLv2)</b>
+ <b><a href="postconf.5.html#smtp_tls_mandatory_protocols">smtp_tls_mandatory_protocols</a> (!SSLv2, !SSLv3)</b>
List of SSL/TLS protocols that the Postfix SMTP client will use
with mandatory TLS encryption.
@@ -497,11 +497,11 @@
Available in Postfix version 2.6 and later:
- <b><a href="postconf.5.html#smtp_tls_protocols">smtp_tls_protocols</a> (!SSLv2)</b>
+ <b><a href="postconf.5.html#smtp_tls_protocols">smtp_tls_protocols</a> (!SSLv2, !SSLv3)</b>
List of TLS protocols that the Postfix SMTP client will exclude
or include with opportunistic TLS encryption.
- <b><a href="postconf.5.html#smtp_tls_ciphers">smtp_tls_ciphers</a> (export)</b>
+ <b><a href="postconf.5.html#smtp_tls_ciphers">smtp_tls_ciphers</a> (medium)</b>
The minimum TLS cipher grade that the Postfix SMTP client will
use with opportunistic TLS encryption.
|
|
[-]
[+]
|
Changed |
_service:download_files:postfix-2.11.6.tar.gz/html/smtpd.8.html
^
|
| @@ -446,7 +446,7 @@
Postfix SMTP server cipher list at mandatory TLS security lev-
els.
- <b><a href="postconf.5.html#smtpd_tls_mandatory_protocols">smtpd_tls_mandatory_protocols</a> (!SSLv2)</b>
+ <b><a href="postconf.5.html#smtpd_tls_mandatory_protocols">smtpd_tls_mandatory_protocols</a> (!SSLv2, !SSLv3)</b>
The SSL/TLS protocols accepted by the Postfix SMTP server with
mandatory TLS encryption.
@@ -494,11 +494,11 @@
Available in Postfix version 2.6 and later:
- <b><a href="postconf.5.html#smtpd_tls_protocols">smtpd_tls_protocols</a> (empty)</b>
+ <b><a href="postconf.5.html#smtpd_tls_protocols">smtpd_tls_protocols</a> (!SSLv2, !SSLv3)</b>
List of TLS protocols that the Postfix SMTP server will exclude
or include with opportunistic TLS encryption.
- <b><a href="postconf.5.html#smtpd_tls_ciphers">smtpd_tls_ciphers</a> (export)</b>
+ <b><a href="postconf.5.html#smtpd_tls_ciphers">smtpd_tls_ciphers</a> (medium)</b>
The minimum TLS cipher grade that the Postfix SMTP server will
use with opportunistic TLS encryption.
|
|
[-]
[+]
|
Changed |
_service:download_files:postfix-2.11.6.tar.gz/makedefs
^
|
| @@ -109,6 +109,8 @@
# Officially supported usage.
0) SYSTEM=`(uname -s) 2>/dev/null`
RELEASE=`(uname -r) 2>/dev/null`
+ # No ${x%%y} support in Solaris 11 /bin/sh
+ RELEASE_MAJOR=`expr "$RELEASE" : '\([0-9]*\)'` || exit 1
VERSION=`(uname -v) 2>/dev/null`
case "$VERSION" in
dcosx*) SYSTEM=$VERSION;;
@@ -365,7 +367,7 @@
fi;;
esac
;;
- Linux.3*) SYSTYPE=LINUX3
+ Linux.[34].*) SYSTYPE=LINUX$RELEASE_MAJOR
case "$CCARGS" in
*-DNO_DB*) ;;
*-DHAS_DB*) ;;
|
|
[-]
[+]
|
Changed |
_service:download_files:postfix-2.11.6.tar.gz/man/man5/postconf.5
^
|
| @@ -2711,7 +2711,7 @@
configuration parameter. See there for details.
.PP
This feature is available in Postfix 2.3 and later.
-.SH lmtp_tls_ciphers (default: export)
+.SH lmtp_tls_ciphers (default: medium)
The LMTP-specific version of the smtp_tls_ciphers configuration
parameter. See there for details.
.PP
@@ -2773,7 +2773,7 @@
configuration parameter. See there for details.
.PP
This feature is available in Postfix 2.3 and later.
-.SH lmtp_tls_mandatory_ciphers (default: empty)
+.SH lmtp_tls_mandatory_ciphers (default: medium)
The LMTP-specific version of the smtp_tls_mandatory_ciphers
configuration parameter. See there for details.
.PP
@@ -2783,7 +2783,7 @@
configuration parameter. See there for details.
.PP
This feature is available in Postfix 2.3 and later.
-.SH lmtp_tls_mandatory_protocols (default: !SSLv2)
+.SH lmtp_tls_mandatory_protocols (default: !SSLv2, !SSLv3)
The LMTP-specific version of the smtp_tls_mandatory_protocols
configuration parameter. See there for details.
.PP
@@ -2803,7 +2803,7 @@
configuration parameter. See there for details.
.PP
This feature is available in Postfix 2.3 and later.
-.SH lmtp_tls_protocols (default: empty)
+.SH lmtp_tls_protocols (default: !SSLv2, !SSLv3)
The LMTP-specific version of the smtp_tls_protocols configuration
parameter. See there for details.
.PP
@@ -6777,29 +6777,19 @@
.PP
This feature is available in Postfix version 2.2. It is not used with
Postfix 2.3 and later; use smtp_tls_mandatory_ciphers instead.
-.SH smtp_tls_ciphers (default: export)
+.SH smtp_tls_ciphers (default: medium)
The minimum TLS cipher grade that the Postfix SMTP client
will use with opportunistic TLS encryption. Cipher types listed in
smtp_tls_exclude_ciphers are excluded from the base definition of
-the selected cipher grade. The default value "export" ensures maximum
-inter-operability. Because encryption is optional, stronger controls
-are not appropriate, and this setting SHOULD NOT be changed unless the
-change is essential.
+the selected cipher grade. The default value is "medium" for
+Postfix releases after the middle of 2015, "export" for older
+releases.
.PP
When TLS is mandatory the cipher grade is chosen via the
smtp_tls_mandatory_ciphers configuration parameter, see there for syntax
details. See smtp_tls_policy_maps for information on how to configure
ciphers on a per-destination basis.
.PP
-Example:
-.nf
-.na
-.ft C
-smtp_tls_ciphers = export
-.fi
-.ad
-.ft R
-.PP
This feature is available in Postfix 2.6 and later. With earlier Postfix
releases only the smtp_tls_mandatory_ciphers parameter is implemented,
and opportunistic TLS always uses "export" or better (i.e. all) ciphers.
@@ -7157,18 +7147,16 @@
.PP
The following cipher grades are supported:
.IP "\fBexport\fR"
-Enable "EXPORT" grade or better OpenSSL
-ciphers. This is the default for opportunistic encryption. It is
-not recommended for mandatory encryption unless you must enforce TLS
-with "crippled" peers. The underlying cipherlist is specified via the
-tls_export_cipherlist configuration parameter, which you are strongly
-encouraged to not change.
+Enable "EXPORT" grade or better OpenSSL ciphers. The underlying
+cipherlist is specified via the tls_export_cipherlist configuration
+parameter, which you are strongly encouraged to not change. This
+choice is insecure and SHOULD NOT be used.
.br
.IP "\fBlow\fR"
-Enable "LOW" grade or better OpenSSL ciphers. This
-setting is only appropriate for internal mail servers. The underlying
+Enable "LOW" grade or better OpenSSL ciphers. The underlying
cipherlist is specified via the tls_low_cipherlist configuration
-parameter, which you are strongly encouraged to not change.
+parameter, which you are strongly encouraged to not change. This
+choice is insecure and SHOULD NOT be used.
.br
.IP "\fBmedium\fR"
Enable "MEDIUM" grade or better OpenSSL ciphers.
@@ -7217,13 +7205,15 @@
attribute. See smtp_tls_policy_maps for notes and examples.
.PP
This feature is available in Postfix 2.3 and later.
-.SH smtp_tls_mandatory_protocols (default: !SSLv2)
+.SH smtp_tls_mandatory_protocols (default: !SSLv2, !SSLv3)
List of SSL/TLS protocols that the Postfix SMTP client will use with
mandatory TLS encryption. In main.cf the values are separated by
whitespace, commas or colons. In the policy table "protocols" attribute
(see smtp_tls_policy_maps) the only valid separator is colon. An
empty value means allow all protocols. The valid protocol names, (see
-\\fBfBSSL_get_version\fR(3)\fR), are "SSLv2", "SSLv3" and "TLSv1".
+\\fBfBSSL_get_version\fR(3)\fR), are "SSLv2", "SSLv3" and "TLSv1". The
+default value is "!SSLv2, !SSLv3" for Postfix releases after the
+middle of 2015, "!SSLv2" for older releases.
.PP
With Postfix >= 2.5 the parameter syntax was expanded to support
protocol exclusions. One can explicitly exclude "SSLv2" by setting
@@ -7270,11 +7260,6 @@
TLSv1, except perhaps via the policy table for destinations which
you are sure will support "TLSv1.1" or "TLSv1.2".
.PP
-Since SSL version 2 has known protocol weaknesses and is now
-deprecated, the default setting excludes "SSLv2". This means that by
-default, SSL version 2 will not be used at the "encrypt" security level
-and higher.
-.PP
See the documentation of the smtp_tls_policy_maps parameter and
TLS_README for more information about security levels.
.PP
@@ -7539,11 +7524,12 @@
configurations in environments where DNS security is not assured.
.PP
This feature is available in Postfix 2.3 and later.
-.SH smtp_tls_protocols (default: !SSLv2)
+.SH smtp_tls_protocols (default: !SSLv2, !SSLv3)
List of TLS protocols that the Postfix SMTP client will exclude or
-include with opportunistic TLS encryption. Starting with Postfix 2.6,
-the Postfix SMTP client will by default not use the obsolete SSLv2
-protocol.
+include with opportunistic TLS encryption. The default value is
+"!SSLv2, !SSLv3" for Postfix releases after the middle of 2015,
+"!SSLv2" for older releases. Before Postfix 2.6, the Postfix SMTP
+client would use all protocols with opportunistic TLS.
.PP
In main.cf the values are separated by whitespace, commas or
colons. In the policy table (see smtp_tls_policy_maps) the only valid
@@ -7574,7 +7560,7 @@
"TLSv1.1" or "TLSv1.2"
.PP
To include a protocol list its name, to exclude it, prefix the name
-with a "!" character. To exclude SSLv2 even for opportunistic TLS set
+with a "!" character. To exclude SSLv2 for opportunistic TLS set
"smtp_tls_protocols = !SSLv2". To exclude both "SSLv2" and "SSLv3" set
"smtp_tls_protocols = !SSLv2, !SSLv3". Explicitly listing the protocols to
include, rather than protocols to exclude, is supported, but not
@@ -7770,7 +7756,7 @@
# can be mitigated by disabling a particular protocol or raising the
# cipher grade from "export" to "low" or "medium").
smtp_tls_ciphers = export
-smtp_tls_protocols = !SSLv2
+smtp_tls_protocols = !SSLv2, !SSLv3
.fi
.ad
.ft R
@@ -10202,28 +10188,17 @@
.PP
This feature is available with Postfix version 2.2. It is not used with
Postfix 2.3 and later; use smtpd_tls_mandatory_ciphers instead.
-.SH smtpd_tls_ciphers (default: export)
+.SH smtpd_tls_ciphers (default: medium)
The minimum TLS cipher grade that the Postfix SMTP server
will use with opportunistic TLS encryption. Cipher types listed in
smtpd_tls_exclude_ciphers are excluded from the base definition of
-the selected cipher grade. The default value "export" ensures maximum
-inter-operability. Because encryption is optional, stronger controls
-are not appropriate, and this setting SHOULD NOT be changed unless the
-change is essential.
+the selected cipher grade. The default value is "medium" for Postfix
+releases after the middle of 2015, "export" for older releases.
.PP
When TLS is mandatory the cipher grade is chosen via the
smtpd_tls_mandatory_ciphers configuration parameter, see there for syntax
details.
.PP
-Example:
-.nf
-.na
-.ft C
-smtpd_tls_ciphers = export
-.fi
-.ad
-.ft R
-.PP
This feature is available in Postfix 2.6 and later. With earlier Postfix
releases only the smtpd_tls_mandatory_ciphers parameter is implemented,
and opportunistic TLS always uses "export" or better (i.e. all) ciphers.
@@ -10594,17 +10569,16 @@
.PP
The following cipher grades are supported:
.IP "\fBexport\fR"
-Enable "EXPORT" grade or stronger OpenSSL ciphers.
-This is the most appropriate setting for public MX hosts, and is always
-used with opportunistic TLS encryption. The underlying cipherlist
-is specified via the tls_export_cipherlist configuration parameter,
-which you are strongly encouraged to not change.
+Enable "EXPORT" grade or stronger OpenSSL ciphers. The
+underlying cipherlist is specified via the tls_export_cipherlist
+configuration parameter, which you are strongly encouraged to not
+change. This choice is insecure and SHOULD NOT be used.
.br
.IP "\fBlow\fR"
-Enable "LOW" grade or stronger OpenSSL ciphers. The
-underlying cipherlist is specified via the tls_low_cipherlist
-configuration parameter, which you are strongly encouraged to
-not change.
+Enable "LOW" grade or stronger OpenSSL ciphers. The underlying
+cipherlist is specified via the tls_low_cipherlist configuration
+parameter, which you are strongly encouraged to not change. This
+choice is insecure and SHOULD NOT be used.
.br
.IP "\fBmedium\fR"
Enable "MEDIUM" grade or stronger OpenSSL ciphers. These use 128-bit
@@ -10653,13 +10627,15 @@
(see there for syntax details).
.PP
This feature is available in Postfix 2.3 and later.
-.SH smtpd_tls_mandatory_protocols (default: !SSLv2)
+.SH smtpd_tls_mandatory_protocols (default: !SSLv2, !SSLv3)
The SSL/TLS protocols accepted by the Postfix SMTP server with
mandatory TLS encryption. If the list is empty, the server supports
all available SSL/TLS protocol versions. A non-empty value is a
list of protocol names separated by whitespace, commas or colons.
The supported protocol names are "SSLv2", "SSLv3" and "TLSv1", and
-are not case sensitive.
+are not case sensitive. The default value is "!SSLv2, !SSLv3" for
+Postfix releases after the middle of 2015, "!SSLv2" for older
+releases.
.PP
With Postfix >= 2.5 the parameter syntax was expanded to support
protocol exclusions. One can explicitly exclude "SSLv2" by setting
@@ -10676,11 +10652,6 @@
versions of Postfix >= 2.10 can disable support for "TLSv1.1" or
"TLSv1.2".
.PP
-Since SSL version 2 has known protocol weaknesses and is now
-deprecated, the default setting excludes "SSLv2". This means that
-by default, SSL version 2 will not be used at the "encrypt" security
-level.
-.PP
Example:
.PP
.nf
@@ -10695,10 +10666,11 @@
.ft R
.PP
This feature is available in Postfix 2.3 and later.
-.SH smtpd_tls_protocols (default: empty)
+.SH smtpd_tls_protocols (default: !SSLv2, !SSLv3)
List of TLS protocols that the Postfix SMTP server will exclude
-or include with opportunistic TLS encryption. This parameter SHOULD
-be left at its default empty value, allowing all protocols to be
+or include with opportunistic TLS encryption. The default value is
+"!SSLv2, !SSLv3" for Postfix releases after the middle of 2015,
+empty for older releases allowing all protocols to be
used with opportunistic TLS. A non-empty value is a list of protocol
names separated by whitespace, commas or colons. The supported
protocol names are "SSLv2", "SSLv3" and "TLSv1", and are not case
@@ -10710,7 +10682,7 @@
"TLSv1.2".
.PP
To include a protocol list its name, to exclude it, prefix the name
-with a "!" character. To exclude SSLv2 even for opportunistic TLS set
+with a "!" character. To exclude SSLv2 for opportunistic TLS set
"smtpd_tls_protocols = !SSLv2". To exclude both "SSLv2" and "SSLv3" set
"smtpd_tls_protocols = !SSLv2, !SSLv3". Explicitly listing the protocols to
include, rather than protocols to exclude, is supported, but not
@@ -10721,7 +10693,7 @@
.nf
.na
.ft C
-smtpd_tls_protocols = !SSLv2
+smtpd_tls_protocols = !SSLv2, !SSLv3
.fi
.ad
.ft R
@@ -11329,26 +11301,21 @@
EC algorithms have not been disabled by the vendor.
.SH tls_export_cipherlist (default: ALL:+RC4:@STRENGTH)
The OpenSSL cipherlist for "EXPORT" or higher grade ciphers. This
-defines the meaning of the "export" setting in smtpd_tls_mandatory_ciphers,
-smtp_tls_mandatory_ciphers and lmtp_tls_mandatory_ciphers. This is
-the cipherlist for the opportunistic ("may") TLS client security
-level and is the default cipherlist for the SMTP server. You are
-strongly encouraged to not change this setting. With OpenSSL 1.0.0 and
-later the cipherlist may start with an "aNULL:" prefix, which restores
-the 0.9.8-compatible ordering of the aNULL ciphers to the top of the
-list when they are enabled. This prefix is not needed with previous
-OpenSSL releases.
+defines the meaning of the "export" setting in smtpd_tls_ciphers,
+smtpd_tls_mandatory_ciphers, smtp_tls_ciphers, smtp_tls_mandatory_ciphers,
+lmtp_tls_ciphers, and lmtp_tls_mandatory_ciphers. With Postfix
+releases before the middle of 2015 this is the default cipherlist
+for the opportunistic ("may") TLS client security level and also
+the default cipherlist for the SMTP server. You are strongly
+encouraged to not change this setting.
.PP
This feature is available in Postfix 2.3 and later.
.SH tls_high_cipherlist (default: ALL:!EXPORT:!LOW:!MEDIUM:+RC4:@STRENGTH)
The OpenSSL cipherlist for "HIGH" grade ciphers. This defines
-the meaning of the "high" setting in smtpd_tls_mandatory_ciphers,
-smtp_tls_mandatory_ciphers and lmtp_tls_mandatory_ciphers. You are
-strongly encouraged to not change this setting. With OpenSSL 1.0.0 and
-later the cipherlist may start with an "aNULL:" prefix, which restores
-the 0.9.8-compatible ordering of the aNULL ciphers to the top of the
-list when they are enabled. This prefix is not needed with previous
-OpenSSL releases.
+the meaning of the "high" setting in smtpd_tls_ciphers,
+smtpd_tls_mandatory_ciphers, smtp_tls_ciphers, smtp_tls_mandatory_ciphers,
+lmtp_tls_ciphers, and lmtp_tls_mandatory_ciphers. You are strongly
+encouraged to not change this setting.
.PP
This feature is available in Postfix 2.3 and later.
.SH tls_legacy_public_key_fingerprints (default: no)
@@ -11366,26 +11333,22 @@
This feature is available in Postfix 2.9.6 and later.
.SH tls_low_cipherlist (default: ALL:!EXPORT:+RC4:@STRENGTH)
The OpenSSL cipherlist for "LOW" or higher grade ciphers. This defines
-the meaning of the "low" setting in smtpd_tls_mandatory_ciphers,
-smtp_tls_mandatory_ciphers and lmtp_tls_mandatory_ciphers. You are
-strongly encouraged to not change this setting. With OpenSSL 1.0.0 and
-later the cipherlist may start with an "aNULL:" prefix, which restores
-the 0.9.8-compatible ordering of the aNULL ciphers to the top of the
-list when they are enabled. This prefix is not needed with previous
-OpenSSL releases.
+the meaning of the "low" setting in smtpd_tls_ciphers,
+smtpd_tls_mandatory_ciphers, smtp_tls_ciphers, smtp_tls_mandatory_ciphers,
+lmtp_tls_ciphers, and lmtp_tls_mandatory_ciphers. You are strongly
+encouraged to not change this setting.
.PP
This feature is available in Postfix 2.3 and later.
.SH tls_medium_cipherlist (default: ALL:!EXPORT:!LOW:+RC4:@STRENGTH)
The OpenSSL cipherlist for "MEDIUM" or higher grade ciphers. This
-defines the meaning of the "medium" setting in smtpd_tls_mandatory_ciphers,
-smtp_tls_mandatory_ciphers and lmtp_tls_mandatory_ciphers. This is
-the default cipherlist for mandatory TLS encryption in the TLS
-client (with anonymous ciphers disabled when verifying server
-certificates). You are strongly encouraged to not change this
-setting. With OpenSSL 1.0.0 and later the cipherlist may start with an
-"aNULL:" prefix, which restores the 0.9.8-compatible ordering of the
-aNULL ciphers to the top of the list when they are enabled. This prefix
-is not needed with previous OpenSSL releases.
+defines the meaning of the "medium" setting in smtpd_tls_ciphers,
+smtpd_tls_mandatory_ciphers, smtp_tls_ciphers, smtp_tls_mandatory_ciphers,
+lmtp_tls_ciphers, and lmtp_tls_mandatory_ciphers. This is the
+default cipherlist for mandatory TLS encryption in the TLS client
+(with anonymous ciphers disabled when verifying server certificates).
+This is the default cipherlist for opportunistic TLS with Postfix
+releases after the middle of 2015. You are strongly encouraged to
+not change this setting.
.PP
This feature is available in Postfix 2.3 and later.
.SH tls_null_cipherlist (default: eNULL:!aNULL)
|
|
[-]
[+]
|
Changed |
_service:download_files:postfix-2.11.6.tar.gz/man/man8/smtp.8
^
|
| @@ -401,7 +401,7 @@
Optional lookup tables with the Postfix SMTP client TLS security
policy by next-hop destination; when a non-empty value is specified,
this overrides the obsolete smtp_tls_per_site parameter.
-.IP "\fBsmtp_tls_mandatory_protocols (!SSLv2)\fR"
+.IP "\fBsmtp_tls_mandatory_protocols (!SSLv2, !SSLv3)\fR"
List of SSL/TLS protocols that the Postfix SMTP client will use with
mandatory TLS encryption.
.IP "\fBsmtp_tls_scert_verifydepth (9)\fR"
@@ -451,10 +451,10 @@
certificate fingerprints.
.PP
Available in Postfix version 2.6 and later:
-.IP "\fBsmtp_tls_protocols (!SSLv2)\fR"
+.IP "\fBsmtp_tls_protocols (!SSLv2, !SSLv3)\fR"
List of TLS protocols that the Postfix SMTP client will exclude or
include with opportunistic TLS encryption.
-.IP "\fBsmtp_tls_ciphers (export)\fR"
+.IP "\fBsmtp_tls_ciphers (medium)\fR"
The minimum TLS cipher grade that the Postfix SMTP client
will use with opportunistic TLS encryption.
.IP "\fBsmtp_tls_eccert_file (empty)\fR"
|
|
[-]
[+]
|
Changed |
_service:download_files:postfix-2.11.6.tar.gz/man/man8/smtpd.8
^
|
| @@ -414,7 +414,7 @@
.IP "\fBsmtpd_tls_mandatory_exclude_ciphers (empty)\fR"
Additional list of ciphers or cipher types to exclude from the
Postfix SMTP server cipher list at mandatory TLS security levels.
-.IP "\fBsmtpd_tls_mandatory_protocols (!SSLv2)\fR"
+.IP "\fBsmtpd_tls_mandatory_protocols (!SSLv2, !SSLv3)\fR"
The SSL/TLS protocols accepted by the Postfix SMTP server with
mandatory TLS encryption.
.IP "\fBsmtpd_tls_received_header (no)\fR"
@@ -452,10 +452,10 @@
for \fBcheck_ccert_access\fR and \fBpermit_tls_clientcerts\fR.
.PP
Available in Postfix version 2.6 and later:
-.IP "\fBsmtpd_tls_protocols (empty)\fR"
+.IP "\fBsmtpd_tls_protocols (!SSLv2, !SSLv3)\fR"
List of TLS protocols that the Postfix SMTP server will exclude
or include with opportunistic TLS encryption.
-.IP "\fBsmtpd_tls_ciphers (export)\fR"
+.IP "\fBsmtpd_tls_ciphers (medium)\fR"
The minimum TLS cipher grade that the Postfix SMTP server
will use with opportunistic TLS encryption.
.IP "\fBsmtpd_tls_eccert_file (empty)\fR"
|
|
[-]
[+]
|
Changed |
_service:download_files:postfix-2.11.6.tar.gz/proto/TLS_README.html
^
|
| @@ -810,14 +810,16 @@
<h3><a name="server_cipher">Server-side cipher controls</a> </h3>
-<p> The Postfix SMTP server supports 5 distinct cipher security levels
-as specified by the smtpd_tls_mandatory_ciphers configuration parameter,
-which determines the cipher grade with mandatory TLS encryption. The
-default value is "medium" which is essentially 128-bit encryption or better.
-With opportunistic TLS encryption, the minimum accepted cipher grade is
-typically "export". The corresponding smtpd_tls_ciphers parameter
-(Postfix ≥ 2.6) controls the cipher grade used with opportunistic
-TLS. </p>
+<p> The Postfix SMTP server supports 5 distinct cipher grades as
+specified by the smtpd_tls_mandatory_ciphers configuration parameter,
+which determines the minimum cipher grade with mandatory TLS
+encryption. The default minimum cipher grade for mandatory TLS is
+"medium" which is essentially 128-bit encryption or better. The
+smtpd_tls_ciphers parameter (Postfix ≥ 2.6) controls the minimum
+cipher grade used with opportunistic TLS. Here, the default minimum
+cipher grade is "medium" for Postfix releases after the middle of
+2015, "export" for older Postfix releases. With Postfix < 2.6,
+the minimum opportunistic TLS cipher grade is always "export". </p>
<p> By default anonymous ciphers are enabled. They are automatically
disabled when remote SMTP client certificates are requested. If
@@ -828,17 +830,12 @@
a remote SMTP client to check the server certificate, so excluding
anonymous ciphers is generally unnecessary. </p>
-<p> The "smtpd_tls_ciphers" configuration parameter (Postfix ≥
-2.6) provides control over the minimum cipher grade for opportunistic
-TLS. With
-Postfix < 2.6, the minimum opportunistic TLS cipher grade is always
-"export". </p>
-
-<p> With mandatory TLS encryption, the Postfix SMTP server will by
-default disable SSLv2. SSLv2 is used only when TLS encryption
-is optional. The mandatory TLS protocol list is specified via the
+<p> With mandatory and opportunistic TLS encryption, the Postfix
+SMTP server by default disables SSLv2 and SSLv3 with Postfix releases
+after the middle of 2015; older releases only disable SSLv2 for
+mandatory TLS. The mandatory TLS protocol list is specified via the
smtpd_tls_mandatory_protocols configuration parameter. The
-corresponding smtpd_tls_protocols parameter (Postfix ≥ 2.6)
+smtpd_tls_protocols parameter (Postfix ≥ 2.6)
controls the SSL/TLS protocols used with opportunistic TLS. </p>
<p> Note that the OpenSSL library only supports protocol exclusion
@@ -1080,14 +1077,11 @@
Opportunistic TLS can be configured by setting "smtp_tls_security_level = may".
For LMTP, use the corresponding "lmtp_" parameter. </p>
-<p> Since sending in the clear is acceptable, demanding stronger
-than default TLS security mostly reduces inter-operability. If you
-must restrict TLS protocol or cipher selection even with opportunistic
-TLS, the "smtp_tls_ciphers" and "smtp_tls_protocols" configuration
-parameters (Postfix ≥ 2.6) provide control over the protocols
-and cipher grade
-used with opportunistic TLS. With earlier releases the opportunistic TLS
-cipher grade is always "export" and no protocols are disabled. </p>
+<p> The "smtp_tls_ciphers" and "smtp_tls_protocols" configuration
+parameters (Postfix ≥ 2.6) provide control over the cipher grade
+and protocols used with opportunistic TLS. With earlier Postfix
+releases, opportunistic TLS always uses the cipher grade "export"
+and enables all protocols. </p>
<p> With opportunistic TLS, mail delivery continues even if the
server certificate is untrusted or bears the wrong name.
@@ -1163,7 +1157,7 @@
<p> In the example below, traffic to <i>example.com</i> and its sub-domains
via the corresponding MX hosts always uses TLS. The SSLv2 protocol
will be disabled (the default setting of smtp_tls_mandatory_protocols
-excludes "SSLv2"). Only high- or medium-strength (i.e. 128 bit or
+excludes SSLv2+3). Only high- or medium-strength (i.e. 128 bit or
better) ciphers will be used by default for all "encrypt" security
level sessions. </p>
@@ -2143,7 +2137,7 @@
used is <a href="#client_tls_may">may</a>. If TLSA records are
found, but none are usable, the effective security level is <a
href="#client_tls_encrypt">encrypt</a>. When usable TLSA records
-are obtained for the remote SMTP server, SSLv2 is automatically
+are obtained for the remote SMTP server, SSLv2+3 are automatically
disabled (see smtp_tls_mandatory_protocols), and the server certificate
must match the TLSA records. RFC 6698 (DANE) TLS authentication
and DNSSEC support is available with Postfix 2.11 and later. </dd>
@@ -2152,7 +2146,7 @@
The TLS policy for the destination is obtained via TLSA records in
DNSSEC. If no TLSA records are found, or none are usable, no
connection is made to the server. When usable TLSA records are
-obtained for the remote SMTP server, SSLv2 is automatically disabled
+obtained for the remote SMTP server, SSLv2+3 are automatically disabled
(see smtp_tls_mandatory_protocols), and the server certificate must
match the TLSA records. RFC 6698 (DANE) TLS authentication and
DNSSEC support is available with Postfix 2.11 and later. </dd>
@@ -2318,7 +2312,7 @@
<h3> <a name="client_cipher">Client-side cipher controls </a> </h3>
-<p> The Postfix SMTP client supports 5 distinct cipher security levels
+<p> The Postfix SMTP client supports 5 distinct cipher grades
as specified by the smtp_tls_mandatory_ciphers configuration
parameter. This setting controls the minimum acceptable SMTP client
TLS cipher grade for use with mandatory TLS encryption. The default
@@ -2339,13 +2333,15 @@
little point in requesting them. </p>
<p> The "smtp_tls_ciphers" configuration parameter (Postfix ≥ 2.6)
-provides control over the minimum cipher grade for opportunistic TLS. With
-Postfix < 2.6, the minimum opportunistic TLS cipher grade is always
-"export". </p>
-
-<p> With mandatory TLS encryption, the Postfix SMTP client will by
-default disable SSLv2. SSLv2 is used only when TLS encryption
-is optional. The mandatory TLS protocol list is specified via the
+provides control over the minimum cipher grade for opportunistic TLS.
+The default minimum cipher grade for opportunistic TLS is "medium"
+for Postfix releases after the middle of 2015, and "export" for
+older releases. With Postfix < 2.6, the minimum opportunistic
+TLS cipher grade is always "export". </p>
+
+<p> With mandatory and opportunistic TLS encryption, the Postfix
+SMTP client will by default disable SSLv2 and SSLv3. The mandatory
+TLS protocol list is specified via the
smtp_tls_mandatory_protocols configuration parameter. The corresponding
smtp_tls_protocols parameter (Postfix ≥ 2.6) controls
the SSL/TLS protocols used with opportunistic TLS. </p>
@@ -2363,7 +2359,7 @@
# Legacy form for Postfix < 2.5:
smtp_tls_mandatory_protocols = SSLv3, TLSv1
# Also available with Postfix ≥ 2.6:
- smtp_tls_ciphers = export
+ smtp_tls_ciphers = medium
smtp_tls_protocols = !SSLv2
</pre>
</blockquote>
|
|
[-]
[+]
|
Changed |
_service:download_files:postfix-2.11.6.tar.gz/proto/postconf.proto
^
|
| @@ -10784,14 +10784,16 @@
<p> This feature is available in Postfix 2.3 and later. </p>
-%PARAM smtp_tls_mandatory_protocols !SSLv2
+%PARAM smtp_tls_mandatory_protocols !SSLv2, !SSLv3
<p> List of SSL/TLS protocols that the Postfix SMTP client will use with
mandatory TLS encryption. In main.cf the values are separated by
whitespace, commas or colons. In the policy table "protocols" attribute
(see smtp_tls_policy_maps) the only valid separator is colon. An
empty value means allow all protocols. The valid protocol names, (see
-<b>SSL_get_version(3)</b>), are "SSLv2", "SSLv3" and "TLSv1". </p>
+<b>SSL_get_version(3)</b>), are "SSLv2", "SSLv3" and "TLSv1". The
+default value is "!SSLv2, !SSLv3" for Postfix releases after the
+middle of 2015, "!SSLv2" for older releases. </p>
<p> With Postfix ≥ 2.5 the parameter syntax was expanded to support
protocol exclusions. One can explicitly exclude "SSLv2" by setting
@@ -10834,11 +10836,6 @@
TLSv1, except perhaps via the policy table for destinations which
you are sure will support "TLSv1.1" or "TLSv1.2". </p>
-<p> Since SSL version 2 has known protocol weaknesses and is now
-deprecated, the default setting excludes "SSLv2". This means that by
-default, SSL version 2 will not be used at the "encrypt" security level
-and higher. </p>
-
<p> See the documentation of the smtp_tls_policy_maps parameter and
TLS_README for more information about security levels. </p>
@@ -10977,7 +10974,7 @@
<p> This feature is available in Postfix 2.3 and later. </p>
-%PARAM lmtp_tls_mandatory_protocols !SSLv2
+%PARAM lmtp_tls_mandatory_protocols !SSLv2, !SSLv3
<p> The LMTP-specific version of the smtp_tls_mandatory_protocols
configuration parameter. See there for details. </p>
@@ -10998,14 +10995,16 @@
<p> This feature is available in Postfix 2.3 and later. </p>
-%PARAM smtpd_tls_mandatory_protocols !SSLv2
+%PARAM smtpd_tls_mandatory_protocols !SSLv2, !SSLv3
<p> The SSL/TLS protocols accepted by the Postfix SMTP server with
mandatory TLS encryption. If the list is empty, the server supports
all available SSL/TLS protocol versions. A non-empty value is a
list of protocol names separated by whitespace, commas or colons.
The supported protocol names are "SSLv2", "SSLv3" and "TLSv1", and
-are not case sensitive. </p>
+are not case sensitive. The default value is "!SSLv2, !SSLv3" for
+Postfix releases after the middle of 2015, "!SSLv2" for older
+releases. </p>
<p> With Postfix ≥ 2.5 the parameter syntax was expanded to support
protocol exclusions. One can explicitly exclude "SSLv2" by setting
@@ -11022,11 +11021,6 @@
versions of Postfix ≥ 2.10 can disable support for "TLSv1.1" or
"TLSv1.2". </p>
-<p> Since SSL version 2 has known protocol weaknesses and is now
-deprecated, the default setting excludes "SSLv2". This means that
-by default, SSL version 2 will not be used at the "encrypt" security
-level. </p>
-
<p> Example: </p>
<pre>
@@ -11161,7 +11155,7 @@
# can be mitigated by disabling a particular protocol or raising the
# cipher grade from "export" to "low" or "medium").
smtp_tls_ciphers = export
-smtp_tls_protocols = !SSLv2
+smtp_tls_protocols = !SSLv2, !SSLv3
</pre>
<pre>
@@ -11419,17 +11413,16 @@
<dl>
<dt><b>export</b></dt>
-<dd> Enable "EXPORT" grade or stronger OpenSSL ciphers.
-This is the most appropriate setting for public MX hosts, and is always
-used with opportunistic TLS encryption. The underlying cipherlist
-is specified via the tls_export_cipherlist configuration parameter,
-which you are strongly encouraged to not change. </dd>
+<dd> Enable "EXPORT" grade or stronger OpenSSL ciphers. The
+underlying cipherlist is specified via the tls_export_cipherlist
+configuration parameter, which you are strongly encouraged to not
+change. This choice is insecure and SHOULD NOT be used. </dd>
<dt><b>low</b></dt>
-<dd> Enable "LOW" grade or stronger OpenSSL ciphers. The
-underlying cipherlist is specified via the tls_low_cipherlist
-configuration parameter, which you are strongly encouraged to
-not change. </dd>
+<dd> Enable "LOW" grade or stronger OpenSSL ciphers. The underlying
+cipherlist is specified via the tls_low_cipherlist configuration
+parameter, which you are strongly encouraged to not change. This
+choice is insecure and SHOULD NOT be used. </dd>
<dt><b>medium</b></dt>
<dd> Enable "MEDIUM" grade or stronger OpenSSL ciphers. These use 128-bit
@@ -11526,18 +11519,16 @@
<dl>
<dt><b>export</b></dt>
-<dd> Enable "EXPORT" grade or better OpenSSL
-ciphers. This is the default for opportunistic encryption. It is
-not recommended for mandatory encryption unless you must enforce TLS
-with "crippled" peers. The underlying cipherlist is specified via the
-tls_export_cipherlist configuration parameter, which you are strongly
-encouraged to not change. </dd>
+<dd> Enable "EXPORT" grade or better OpenSSL ciphers. The underlying
+cipherlist is specified via the tls_export_cipherlist configuration
+parameter, which you are strongly encouraged to not change. This
+choice is insecure and SHOULD NOT be used. </dd>
<dt><b>low</b></dt>
-<dd> Enable "LOW" grade or better OpenSSL ciphers. This
-setting is only appropriate for internal mail servers. The underlying
+<dd> Enable "LOW" grade or better OpenSSL ciphers. The underlying
cipherlist is specified via the tls_low_cipherlist configuration
-parameter, which you are strongly encouraged to not change. </dd>
+parameter, which you are strongly encouraged to not change. This
+choice is insecure and SHOULD NOT be used. </dd>
<dt><b>medium</b></dt>
<dd> Enable "MEDIUM" grade or better OpenSSL ciphers.
@@ -11623,56 +11614,47 @@
%PARAM tls_high_cipherlist ALL:!EXPORT:!LOW:!MEDIUM:+RC4:@STRENGTH
<p> The OpenSSL cipherlist for "HIGH" grade ciphers. This defines
-the meaning of the "high" setting in smtpd_tls_mandatory_ciphers,
-smtp_tls_mandatory_ciphers and lmtp_tls_mandatory_ciphers. You are
-strongly encouraged to not change this setting. With OpenSSL 1.0.0 and
-later the cipherlist may start with an "aNULL:" prefix, which restores
-the 0.9.8-compatible ordering of the aNULL ciphers to the top of the
-list when they are enabled. This prefix is not needed with previous
-OpenSSL releases. </p>
+the meaning of the "high" setting in smtpd_tls_ciphers,
+smtpd_tls_mandatory_ciphers, smtp_tls_ciphers, smtp_tls_mandatory_ciphers,
+lmtp_tls_ciphers, and lmtp_tls_mandatory_ciphers. You are strongly
+encouraged to not change this setting. </p>
<p> This feature is available in Postfix 2.3 and later. </p>
%PARAM tls_medium_cipherlist ALL:!EXPORT:!LOW:+RC4:@STRENGTH
<p> The OpenSSL cipherlist for "MEDIUM" or higher grade ciphers. This
-defines the meaning of the "medium" setting in smtpd_tls_mandatory_ciphers,
-smtp_tls_mandatory_ciphers and lmtp_tls_mandatory_ciphers. This is
-the default cipherlist for mandatory TLS encryption in the TLS
-client (with anonymous ciphers disabled when verifying server
-certificates). You are strongly encouraged to not change this
-setting. With OpenSSL 1.0.0 and later the cipherlist may start with an
-"aNULL:" prefix, which restores the 0.9.8-compatible ordering of the
-aNULL ciphers to the top of the list when they are enabled. This prefix
-is not needed with previous OpenSSL releases. </p>
+defines the meaning of the "medium" setting in smtpd_tls_ciphers,
+smtpd_tls_mandatory_ciphers, smtp_tls_ciphers, smtp_tls_mandatory_ciphers,
+lmtp_tls_ciphers, and lmtp_tls_mandatory_ciphers. This is the
+default cipherlist for mandatory TLS encryption in the TLS client
+(with anonymous ciphers disabled when verifying server certificates).
+This is the default cipherlist for opportunistic TLS with Postfix
+releases after the middle of 2015. You are strongly encouraged to
+not change this setting. </p>
<p> This feature is available in Postfix 2.3 and later. </p>
%PARAM tls_low_cipherlist ALL:!EXPORT:+RC4:@STRENGTH
<p> The OpenSSL cipherlist for "LOW" or higher grade ciphers. This defines
-the meaning of the "low" setting in smtpd_tls_mandatory_ciphers,
-smtp_tls_mandatory_ciphers and lmtp_tls_mandatory_ciphers. You are
-strongly encouraged to not change this setting. With OpenSSL 1.0.0 and
-later the cipherlist may start with an "aNULL:" prefix, which restores
-the 0.9.8-compatible ordering of the aNULL ciphers to the top of the
-list when they are enabled. This prefix is not needed with previous
-OpenSSL releases. </p>
+the meaning of the "low" setting in smtpd_tls_ciphers,
+smtpd_tls_mandatory_ciphers, smtp_tls_ciphers, smtp_tls_mandatory_ciphers,
+lmtp_tls_ciphers, and lmtp_tls_mandatory_ciphers. You are strongly
+encouraged to not change this setting. </p>
<p> This feature is available in Postfix 2.3 and later. </p>
%PARAM tls_export_cipherlist ALL:+RC4:@STRENGTH
<p> The OpenSSL cipherlist for "EXPORT" or higher grade ciphers. This
-defines the meaning of the "export" setting in smtpd_tls_mandatory_ciphers,
-smtp_tls_mandatory_ciphers and lmtp_tls_mandatory_ciphers. This is
-the cipherlist for the opportunistic ("may") TLS client security
-level and is the default cipherlist for the SMTP server. You are
-strongly encouraged to not change this setting. With OpenSSL 1.0.0 and
-later the cipherlist may start with an "aNULL:" prefix, which restores
-the 0.9.8-compatible ordering of the aNULL ciphers to the top of the
-list when they are enabled. This prefix is not needed with previous
-OpenSSL releases. </p>
+defines the meaning of the "export" setting in smtpd_tls_ciphers,
+smtpd_tls_mandatory_ciphers, smtp_tls_ciphers, smtp_tls_mandatory_ciphers,
+lmtp_tls_ciphers, and lmtp_tls_mandatory_ciphers. With Postfix
+releases before the middle of 2015 this is the default cipherlist
+for the opportunistic ("may") TLS client security level and also
+the default cipherlist for the SMTP server. You are strongly
+encouraged to not change this setting. </p>
<p> This feature is available in Postfix 2.3 and later. </p>
@@ -11686,7 +11668,7 @@
<p> This feature is available in Postfix 2.3 and later. </p>
-%PARAM lmtp_tls_mandatory_ciphers
+%PARAM lmtp_tls_mandatory_ciphers medium
<p> The LMTP-specific version of the smtp_tls_mandatory_ciphers
configuration parameter. See there for details. </p>
@@ -12144,12 +12126,13 @@
<p> This feature is available in Postfix 2.5 and later. </p>
-%PARAM smtp_tls_protocols !SSLv2
+%PARAM smtp_tls_protocols !SSLv2, !SSLv3
<p> List of TLS protocols that the Postfix SMTP client will exclude or
-include with opportunistic TLS encryption. Starting with Postfix 2.6,
-the Postfix SMTP client will by default not use the obsolete SSLv2
-protocol. </p>
+include with opportunistic TLS encryption. The default value is
+"!SSLv2, !SSLv3" for Postfix releases after the middle of 2015,
+"!SSLv2" for older releases. Before Postfix 2.6, the Postfix SMTP
+client would use all protocols with opportunistic TLS. </p>
<p> In main.cf the values are separated by whitespace, commas or
colons. In the policy table (see smtp_tls_policy_maps) the only valid
@@ -12175,7 +12158,7 @@
"TLSv1.1" or "TLSv1.2"</p>
<p> To include a protocol list its name, to exclude it, prefix the name
-with a "!" character. To exclude SSLv2 even for opportunistic TLS set
+with a "!" character. To exclude SSLv2 for opportunistic TLS set
"smtp_tls_protocols = !SSLv2". To exclude both "SSLv2" and "SSLv3" set
"smtp_tls_protocols = !SSLv2, !SSLv3". Explicitly listing the protocols to
include, rather than protocols to exclude, is supported, but not
@@ -12190,11 +12173,12 @@
<p> This feature is available in Postfix 2.6 and later. </p>
-%PARAM smtpd_tls_protocols
+%PARAM smtpd_tls_protocols !SSLv2, !SSLv3
<p> List of TLS protocols that the Postfix SMTP server will exclude
-or include with opportunistic TLS encryption. This parameter SHOULD
-be left at its default empty value, allowing all protocols to be
+or include with opportunistic TLS encryption. The default value is
+"!SSLv2, !SSLv3" for Postfix releases after the middle of 2015,
+empty for older releases allowing all protocols to be
used with opportunistic TLS. A non-empty value is a list of protocol
names separated by whitespace, commas or colons. The supported
protocol names are "SSLv2", "SSLv3" and "TLSv1", and are not case
@@ -12206,7 +12190,7 @@
"TLSv1.2". </p>
<p> To include a protocol list its name, to exclude it, prefix the name
-with a "!" character. To exclude SSLv2 even for opportunistic TLS set
+with a "!" character. To exclude SSLv2 for opportunistic TLS set
"smtpd_tls_protocols = !SSLv2". To exclude both "SSLv2" and "SSLv3" set
"smtpd_tls_protocols = !SSLv2, !SSLv3". Explicitly listing the protocols to
include, rather than protocols to exclude, is supported, but not
@@ -12215,66 +12199,54 @@
<p> Example: </p>
<pre>
-smtpd_tls_protocols = !SSLv2
+smtpd_tls_protocols = !SSLv2, !SSLv3
</pre>
<p> This feature is available in Postfix 2.6 and later. </p>
-%PARAM lmtp_tls_protocols
+%PARAM lmtp_tls_protocols !SSLv2, !SSLv3
<p> The LMTP-specific version of the smtp_tls_protocols configuration
parameter. See there for details. </p>
<p> This feature is available in Postfix 2.6 and later. </p>
-%PARAM smtp_tls_ciphers export
+%PARAM smtp_tls_ciphers medium
<p> The minimum TLS cipher grade that the Postfix SMTP client
will use with opportunistic TLS encryption. Cipher types listed in
smtp_tls_exclude_ciphers are excluded from the base definition of
-the selected cipher grade. The default value "export" ensures maximum
-inter-operability. Because encryption is optional, stronger controls
-are not appropriate, and this setting SHOULD NOT be changed unless the
-change is essential. </p>
+the selected cipher grade. The default value is "medium" for
+Postfix releases after the middle of 2015, "export" for older
+releases. </p>
<p> When TLS is mandatory the cipher grade is chosen via the
smtp_tls_mandatory_ciphers configuration parameter, see there for syntax
details. See smtp_tls_policy_maps for information on how to configure
ciphers on a per-destination basis. </p>
-<p> Example: </p>
-<pre>
-smtp_tls_ciphers = export
-</pre>
-
<p> This feature is available in Postfix 2.6 and later. With earlier Postfix
releases only the smtp_tls_mandatory_ciphers parameter is implemented,
and opportunistic TLS always uses "export" or better (i.e. all) ciphers. </p>
-%PARAM smtpd_tls_ciphers export
+%PARAM smtpd_tls_ciphers medium
<p> The minimum TLS cipher grade that the Postfix SMTP server
will use with opportunistic TLS encryption. Cipher types listed in
smtpd_tls_exclude_ciphers are excluded from the base definition of
-the selected cipher grade. The default value "export" ensures maximum
-inter-operability. Because encryption is optional, stronger controls
-are not appropriate, and this setting SHOULD NOT be changed unless the
-change is essential. </p>
+the selected cipher grade. The default value is "medium" for Postfix
+releases after the middle of 2015, "export" for older releases.
+</p>
<p> When TLS is mandatory the cipher grade is chosen via the
smtpd_tls_mandatory_ciphers configuration parameter, see there for syntax
details. </p>
-<p> Example: </p>
-<pre>
-smtpd_tls_ciphers = export
-</pre>
-
<p> This feature is available in Postfix 2.6 and later. With earlier Postfix
releases only the smtpd_tls_mandatory_ciphers parameter is implemented,
and opportunistic TLS always uses "export" or better (i.e. all) ciphers. </p>
-%PARAM lmtp_tls_ciphers export
+%PARAM lmtp_tls_ciphers medium
<p> The LMTP-specific version of the smtp_tls_ciphers configuration
parameter. See there for details. </p>
|
|
[-]
[+]
|
Changed |
_service:download_files:postfix-2.11.6.tar.gz/src/global/mail_params.h
^
|
| @@ -1276,15 +1276,15 @@
extern char *var_smtpd_tls_CApath;
#define VAR_SMTPD_TLS_PROTO "smtpd_tls_protocols"
-#define DEF_SMTPD_TLS_PROTO ""
+#define DEF_SMTPD_TLS_PROTO "!SSLv2, !SSLv3"
extern char *var_smtpd_tls_proto;
#define VAR_SMTPD_TLS_MAND_PROTO "smtpd_tls_mandatory_protocols"
-#define DEF_SMTPD_TLS_MAND_PROTO "!SSLv2"
+#define DEF_SMTPD_TLS_MAND_PROTO "!SSLv2, !SSLv3"
extern char *var_smtpd_tls_mand_proto;
#define VAR_SMTPD_TLS_CIPH "smtpd_tls_ciphers"
-#define DEF_SMTPD_TLS_CIPH "export"
+#define DEF_SMTPD_TLS_CIPH "medium"
extern char *var_smtpd_tls_ciph;
#define VAR_SMTPD_TLS_MAND_CIPH "smtpd_tls_mandatory_ciphers"
@@ -1425,9 +1425,9 @@
extern char *var_smtp_tls_CApath;
#define VAR_SMTP_TLS_CIPH "smtp_tls_ciphers"
-#define DEF_SMTP_TLS_CIPH "export"
+#define DEF_SMTP_TLS_CIPH "medium"
#define VAR_LMTP_TLS_CIPH "lmtp_tls_ciphers"
-#define DEF_LMTP_TLS_CIPH "export"
+#define DEF_LMTP_TLS_CIPH "medium"
extern char *var_smtp_tls_ciph;
#define VAR_SMTP_TLS_MAND_CIPH "smtp_tls_mandatory_ciphers"
@@ -1496,15 +1496,15 @@
extern char *var_smtp_tls_policy;
#define VAR_SMTP_TLS_PROTO "smtp_tls_protocols"
-#define DEF_SMTP_TLS_PROTO "!SSLv2"
+#define DEF_SMTP_TLS_PROTO "!SSLv2, !SSLv3"
#define VAR_LMTP_TLS_PROTO "lmtp_tls_protocols"
-#define DEF_LMTP_TLS_PROTO "!SSLv2"
+#define DEF_LMTP_TLS_PROTO "!SSLv2, !SSLv3"
extern char *var_smtp_tls_proto;
#define VAR_SMTP_TLS_MAND_PROTO "smtp_tls_mandatory_protocols"
-#define DEF_SMTP_TLS_MAND_PROTO "!SSLv2"
+#define DEF_SMTP_TLS_MAND_PROTO "!SSLv2, !SSLv3"
#define VAR_LMTP_TLS_MAND_PROTO "lmtp_tls_mandatory_protocols"
-#define DEF_LMTP_TLS_MAND_PROTO "!SSLv2"
+#define DEF_LMTP_TLS_MAND_PROTO "!SSLv2, !SSLv3"
extern char *var_smtp_tls_mand_proto;
#define VAR_SMTP_TLS_VFY_CMATCH "smtp_tls_verify_cert_match"
|
|
[-]
[+]
|
Changed |
_service:download_files:postfix-2.11.6.tar.gz/src/global/mail_version.h
^
|
| @@ -20,8 +20,8 @@
* Patches change both the patchlevel and the release date. Snapshots have no
* patchlevel; they change the release date only.
*/
-#define MAIL_RELEASE_DATE "20150412"
-#define MAIL_VERSION_NUMBER "2.11.5"
+#define MAIL_RELEASE_DATE "20150720"
+#define MAIL_VERSION_NUMBER "2.11.6"
#ifdef SNAPSHOT
#define MAIL_VERSION_DATE "-" MAIL_RELEASE_DATE
|
|
[-]
[+]
|
Changed |
_service:download_files:postfix-2.11.6.tar.gz/src/smtp/smtp.c
^
|
| @@ -371,7 +371,7 @@
/* Optional lookup tables with the Postfix SMTP client TLS security
/* policy by next-hop destination; when a non-empty value is specified,
/* this overrides the obsolete smtp_tls_per_site parameter.
-/* .IP "\fBsmtp_tls_mandatory_protocols (!SSLv2)\fR"
+/* .IP "\fBsmtp_tls_mandatory_protocols (!SSLv2, !SSLv3)\fR"
/* List of SSL/TLS protocols that the Postfix SMTP client will use with
/* mandatory TLS encryption.
/* .IP "\fBsmtp_tls_scert_verifydepth (9)\fR"
@@ -421,10 +421,10 @@
/* certificate fingerprints.
/* .PP
/* Available in Postfix version 2.6 and later:
-/* .IP "\fBsmtp_tls_protocols (!SSLv2)\fR"
+/* .IP "\fBsmtp_tls_protocols (!SSLv2, !SSLv3)\fR"
/* List of TLS protocols that the Postfix SMTP client will exclude or
/* include with opportunistic TLS encryption.
-/* .IP "\fBsmtp_tls_ciphers (export)\fR"
+/* .IP "\fBsmtp_tls_ciphers (medium)\fR"
/* The minimum TLS cipher grade that the Postfix SMTP client
/* will use with opportunistic TLS encryption.
/* .IP "\fBsmtp_tls_eccert_file (empty)\fR"
|
|
[-]
[+]
|
Changed |
_service:download_files:postfix-2.11.6.tar.gz/src/smtpd/smtpd.c
^
|
| @@ -380,7 +380,7 @@
/* .IP "\fBsmtpd_tls_mandatory_exclude_ciphers (empty)\fR"
/* Additional list of ciphers or cipher types to exclude from the
/* Postfix SMTP server cipher list at mandatory TLS security levels.
-/* .IP "\fBsmtpd_tls_mandatory_protocols (!SSLv2)\fR"
+/* .IP "\fBsmtpd_tls_mandatory_protocols (!SSLv2, !SSLv3)\fR"
/* The SSL/TLS protocols accepted by the Postfix SMTP server with
/* mandatory TLS encryption.
/* .IP "\fBsmtpd_tls_received_header (no)\fR"
@@ -418,10 +418,10 @@
/* for \fBcheck_ccert_access\fR and \fBpermit_tls_clientcerts\fR.
/* .PP
/* Available in Postfix version 2.6 and later:
-/* .IP "\fBsmtpd_tls_protocols (empty)\fR"
+/* .IP "\fBsmtpd_tls_protocols (!SSLv2, !SSLv3)\fR"
/* List of TLS protocols that the Postfix SMTP server will exclude
/* or include with opportunistic TLS encryption.
-/* .IP "\fBsmtpd_tls_ciphers (export)\fR"
+/* .IP "\fBsmtpd_tls_ciphers (medium)\fR"
/* The minimum TLS cipher grade that the Postfix SMTP server
/* will use with opportunistic TLS encryption.
/* .IP "\fBsmtpd_tls_eccert_file (empty)\fR"
|
|
[-]
[+]
|
Changed |
_service:download_files:postfix-2.11.6.tar.gz/src/util/sys_defs.h
^
|
| @@ -755,7 +755,7 @@
/*
* LINUX.
*/
-#if defined(LINUX2) || defined(LINUX3)
+#if defined(LINUX2) || defined(LINUX3) || defined(LINUX4)
#define SUPPORTED
#include <sys/types.h>
#define UINT32_TYPE unsigned int
|
