/*++
/* NAME
/* smtpd 8
/* SUMMARY
/* Postfix SMTP server
/* SYNOPSIS
/* \fBsmtpd\fR [generic Postfix daemon options]
/* DESCRIPTION
/* The SMTP server accepts network connection requests
/* and performs zero or more SMTP transactions per connection.
/* Each received message is piped through the \fBcleanup\fR(8)
/* daemon, and is placed into the \fBincoming\fR queue as one
/* single queue file. For this mode of operation, the program
/* expects to be run from the \fBmaster\fR(8) process manager.
/*
/* Alternatively, the SMTP server takes an established
/* connection on standard input and deposits messages directly
/* into the \fBmaildrop\fR queue. In this so-called stand-alone
/* mode, the SMTP server can accept mail even while the mail
/* system is not running.
/*
/* The SMTP server implements a variety of policies for connection
/* requests, and for parameters given to \fBHELO, ETRN, MAIL FROM, VRFY\fR
/* and \fBRCPT TO\fR commands. They are detailed below and in the
/* \fBmain.cf\fR configuration file.
/* SECURITY
/* .ad
/* .fi
/* The SMTP server is moderately security-sensitive. It talks to SMTP
/* clients and to DNS servers on the network. The SMTP server can be
/* run chrooted at fixed low privilege.
/* STANDARDS
/* RFC 821 (SMTP protocol)
/* RFC 1123 (Host requirements)
/* RFC 1652 (8bit-MIME transport)
/* RFC 1869 (SMTP service extensions)
/* RFC 1870 (Message Size Declaration)
/* RFC 1985 (ETRN command)
/* RFC 2554 (AUTH command)
/* RFC 2821 (SMTP protocol)
/* RFC 2920 (SMTP Pipelining)
/* DIAGNOSTICS
/* Problems and transactions are logged to \fBsyslogd\fR(8).
/*
/* Depending on the setting of the \fBnotify_classes\fR parameter,
/* the postmaster is notified of bounces, protocol problems,
/* policy violations, and of other trouble.
/* CONFIGURATION PARAMETERS
/* .ad
/* .fi
/* Changes to \fBmain.cf\fR are picked up automatically, as smtpd(8)
/* processes run for only a limited amount of time. Use the command
/* "\fBpostfix reload\fR" to speed up a change.
/*
/* The text below provides only a parameter summary. See
/* postconf(5) for more details including examples.
/* COMPATIBILITY CONTROLS
/* .ad
/* .fi
/* The following parameters work around implementation errors in other
/* software, and/or allow you to override standards in order to prevent
/* undesirable use.
/* .ad
/* .fi
/* .IP "\fBbroken_sasl_auth_clients (no)\fR"
/* Enable inter-operability with SMTP clients that implement an obsolete
/* version of the AUTH command (RFC 2554).
/* .IP "\fBdisable_vrfy_command (no)\fR"
/* Disable the SMTP VRFY command.
/* .IP "\fBsmtpd_noop_commands (empty)\fR"
/* List of commands that the Postfix SMTP server replies to with "250
/* Ok", without doing any syntax checks and without changing state.
/* .IP "\fBstrict_rfc821_envelopes (no)\fR"
/* Require that addresses received in SMTP MAIL FROM and RCPT TO
/* commands are enclosed with <>, and that those addresses do
/* not contain RFC 822 style comments or phrases.
/* .PP
/* Available in Postfix version 2.1 and later:
/* .IP "\fBresolve_null_domain (no)\fR"
/* Resolve an address that ends in the "@" null domain as if the
/* local hostname were specified, instead of rejecting the address as
/* invalid.
/* .IP "\fBsmtpd_reject_unlisted_sender (no)\fR"
/* Request that the Postfix SMTP server rejects mail from unknown
/* sender addresses, even when no explicit reject_unlisted_sender
/* access restriction is specified.
/* .IP "\fBsmtpd_sasl_exceptions_networks (empty)\fR"
/* What SMTP clients Postfix will not offer AUTH support to.
/* AFTER QUEUE EXTERNAL CONTENT INSPECTION CONTROLS
/* .ad
/* .fi
/* As of version 1.0, Postfix can be configured to send new mail to
/* an external content filter AFTER the mail is queued. This content
/* filter is expected to inject mail back into a (Postfix or other)
/* MTA for further delivery. See the FILTER_README document for details.
/* .IP "\fBcontent_filter (empty)\fR"
/* The name of a mail delivery transport that filters mail after
/* it is queued.
/* BEFORE QUEUE EXTERNAL CONTENT INSPECTION CONTROLS
/* .ad
/* .fi
/* As of version 2.1, the Postfix SMTP server can be configured
/* to send incoming mail to a real-time SMTP-based content filter
/* BEFORE mail is queued. This content filter is expected to inject
/* mail back into Postfix. See the SMTPD_PROXY_README document for
/* details on how to configure and operate this feature.
/* .IP "\fBsmtpd_proxy_filter (empty)\fR"
/* The hostname and TCP port of the mail filtering proxy server.
/* .IP "\fBsmtpd_proxy_ehlo ($myhostname)\fR"
/* How the Postfix SMTP server announces itself to the proxy filter.
/* .IP "\fBsmtpd_proxy_timeout (100s)\fR"
/* The time limit for connecting to a proxy filter and for sending or
/* receiving information.
/* GENERAL CONTENT INSPECTION CONTROLS
/* .ad
/* .fi
/* The following parameters are applicable for both built-in
/* and external content filters.
/* .PP
/* Available in Postfix version 2.1 and later:
/* .IP "\fBreceive_override_options (empty)\fR"
/* Enable or disable recipient validation, built-in content
/* filtering, or address rewriting.
/* EXTERNAL CONTENT INSPECTION CONTROLS
/* .ad
/* .fi
/* The following parameters are applicable for both before-queue
/* and after-queue content filtering.
/* .PP
/* Available in Postfix version 2.1 and later:
/* .IP "\fBsmtpd_authorized_xforward_hosts (empty)\fR"
/* What SMTP clients are allowed to use the XFORWARD feature.
/* SASL AUTHENTICATION CONTROLS
/* .ad
/* .fi
/* Postfix SASL support (RFC 2554) can be used to authenticate remote
/* SMTP clients to the Postfix SMTP server, and to authenticate the
/* Postfix SMTP client to a remote SMTP server.
/* See the SASL_README document for details.
/* .IP "\fBbroken_sasl_auth_clients (no)\fR"
/* Enable inter-operability with SMTP clients that implement an obsolete
/* version of the AUTH command (RFC 2554).
/* .IP "\fBsmtpd_sasl_auth_enable (no)\fR"
/* Enable SASL authentication in the Postfix SMTP server.
/* .IP "\fBsmtpd_sasl_application_name (smtpd)\fR"
/* The application name used for SASL server initialization.
/* .IP "\fBsmtpd_sasl_local_domain (empty)\fR"
/* The name of the local SASL authentication realm.
/* .IP "\fBsmtpd_sasl_security_options (noanonymous)\fR"
/* Restrict what authentication mechanisms the Postfix SMTP server
/* will offer to the client.
/* .IP "\fBsmtpd_sender_login_maps (empty)\fR"
/* Optional lookup table with the SASL login names that own sender
/* (MAIL FROM) addresses.
/* .PP
/* Available in Postfix version 2.1 and later:
/* .IP "\fBsmtpd_sasl_exceptions_networks (empty)\fR"
/* What SMTP clients Postfix will not offer AUTH support to.
/* VERP SUPPORT CONTROLS
/* .ad
/* .fi
/* With VERP style delivery, each recipient of a message receives a
/* customized copy of the message with his/her own recipient address
/* encoded in the envelope sender address. The VERP_README file
/* describes configuration and operation details of Postfix support
/* for variable envelope return path addresses. VERP style delivery
/* is requested with the SMTP XVERP command or with the "sendmail
/* -V" command-line option and is available in Postfix version 1.1
/* and later.
/* .IP "\fBdefault_verp_delimiters (+=)\fR"
/* The two default VERP delimiter characters.
/* .IP "\fBverp_delimiter_filter (-=+)\fR"
/* The characters Postfix accepts as VERP delimiter characters on the
/* Postfix sendmail(1) command line and in SMTP commands.
/* .PP
/* Available in Postfix version 1.1 and 2.0:
/* .IP "\fBauthorized_verp_clients ($mynetworks)\fR"
/* What SMTP clients are allowed to specify the XVERP command.
/* .PP
/* Available in Postfix version 2.1 and later:
/* .IP "\fBsmtpd_authorized_verp_clients ($authorized_verp_clients)\fR"
/* What SMTP clients are allowed to specify the XVERP command.
/* TROUBLE SHOOTING CONTROLS
/* .ad
/* .fi
/* The DEBUG_README document describes how to debug parts of the
/* Postfix mail system. The methods vary from making the software log
/* a lot of detail, to running some daemon processes under control of
/* a call tracer or debugger.
/* .IP "\fBdebug_peer_level (2)\fR"
/* The increment in verbose logging level when a remote client or
/* server matches a pattern in the debug_peer_list parameter.
/* .IP "\fBdebug_peer_list (empty)\fR"
/* 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 $debug_peer_level.
/* .IP "\fBerror_notice_recipient (postmaster)\fR"
/* The recipient of postmaster notifications about mail delivery
/* problems that are caused by policy, resource, software or protocol
/* errors.
/* .IP "\fBnotify_classes (resource, software)\fR"
/* The list of error classes that are reported to the postmaster.
/* .IP "\fBsoft_bounce (no)\fR"
/* Safety net to keep mail queued that would otherwise be returned to
/* the sender.
/* .PP
/* Available in Postfix version 2.1 and later:
/* .IP "\fBsmtpd_authorized_xclient_hosts (empty)\fR"
/* What SMTP clients are allowed to use the XCLIENT feature.
/* KNOWN VERSUS UNKNOWN RECIPIENT CONTROLS
/* .ad
/* .fi
/* As of Postfix version 2.0, the SMTP server rejects mail for
/* unknown recipients. This prevents the mail queue from clogging up
/* with undeliverable MAILER-DAEMON messages. Additional information
/* on this topic is in the LOCAL_RECIPIENT_README and ADDRESS_CLASS_README
/* documents.
/* .IP "\fBshow_user_unknown_table_name (yes)\fR"
/* Display the name of the recipient table in the "User unknown"
/* responses.
/* .IP "\fBcanonical_maps (empty)\fR"
/* Optional address mapping lookup tables for message headers and
/* envelopes.
/* .IP "\fBrecipient_canonical_maps (empty)\fR"
/* Optional address mapping lookup tables for envelope and header
/* recipient addresses.
/* .PP
/* Parameters concerning known/unknown local recipients:
/* .IP "\fBmydestination ($myhostname, localhost.$mydomain, localhost)\fR"
/* The list of domains that are delivered via the $local_transport
/* mail delivery transport.
/* .IP "\fBinet_interfaces (all)\fR"
/* The network interface addresses that this mail system receives mail
/* on.
/* .IP "\fBproxy_interfaces (empty)\fR"
/* The network interface addresses that this mail system receives mail
/* on by way of a proxy or network address translation unit.
/* .IP "\fBlocal_recipient_maps (proxy:unix:passwd.byname $alias_maps)\fR"
/* Lookup tables with all names or addresses of local recipients:
/* a recipient address is local when its domain matches $mydestination,
/* $inet_interfaces or $proxy_interfaces.
/* .IP "\fBunknown_local_recipient_reject_code (550)\fR"
/* The numerical Postfix SMTP server response code when a recipient
/* address is local, and $local_recipient_maps specifies a list of
/* lookup tables that does not match the recipient.
/* .PP
/* Parameters concerning known/unknown recipients of relay destinations:
/* .IP "\fBrelay_domains ($mydestination)\fR"
/* What destination domains (and subdomains thereof) this system
/* will relay mail to.
/* .IP "\fBrelay_recipient_maps (empty)\fR"
/* Optional lookup tables with all valid addresses in the domains
/* that match $relay_domains.
/* .IP "\fBunknown_relay_recipient_reject_code (550)\fR"
/* The numerical Postfix SMTP server reply code when a recipient
/* address matches $relay_domains, and relay_recipient_maps specifies
/* a list of lookup tables that does not match the recipient address.
/* .PP
/* Parameters concerning known/unknown recipients in virtual alias
/* domains:
/* .IP "\fBvirtual_alias_domains ($virtual_alias_maps)\fR"
/* Optional list of names of virtual alias domains, that is,
/* domains for which all addresses are aliased to addresses in other
/* local or remote domains.
/* .IP "\fBvirtual_alias_maps ($virtual_maps)\fR"
/* Optional lookup tables that alias specific mail addresses or domains
/* to other local or remote address.
/* .IP "\fBunknown_virtual_alias_reject_code (550)\fR"
/* The SMTP server reply code when a recipient address matches
/* $virtual_alias_domains, and $virtual_alias_maps specifies a list
/* of lookup tables that does not match the recipient address.
/* .PP
/* Parameters concerning known/unknown recipients in virtual mailbox
/* domains:
/* .IP "\fBvirtual_mailbox_domains ($virtual_mailbox_maps)\fR"
/* The list of domains that are delivered via the $virtual_transport
/* mail delivery transport.
/* .IP "\fBvirtual_mailbox_maps (empty)\fR"
/* Optional lookup tables with all valid addresses in the domains that
/* match $virtual_mailbox_domains.
/* .IP "\fBunknown_virtual_mailbox_reject_code (550)\fR"
/* The SMTP server reply code when a recipient address matches
/* $virtual_mailbox_domains, and $virtual_mailbox_maps specifies a list
/* of lookup tables that does not match the recipient address.
/* RESOURCE AND RATE CONTROLS
/* .ad
/* .fi
/* The following parameters limit resource usage by the SMTP
/* server and/or control client request rates.
/* .IP "\fBline_length_limit (2048)\fR"
/* Upon input, long lines are chopped up into pieces of at most
/* this length; upon delivery, long lines are reconstructed.
/* .IP "\fBqueue_minfree (0)\fR"
/* The minimal amount of free space in bytes in the queue file system
/* that is needed to receive mail.
/* .IP "\fBmessage_size_limit (10240000)\fR"
/* The maximal size in bytes of a message, including envelope information.
/* .IP "\fBsmtpd_recipient_limit (1000)\fR"
/* The maximal number of recipients that the Postfix SMTP server
/* accepts per message delivery request.
/* .IP "\fBsmtpd_timeout (300s)\fR"
/* The time limit for sending a Postfix SMTP server response and for
/* receiving a remote SMTP client request.
/* .IP "\fBsmtpd_history_flush_threshold (100)\fR"
/* The maximal number of lines in the Postfix SMTP server command history
/* before it is flushed upon receipt of EHLO, RSET, or end of DATA.
/* .PP
/* Not available in Postfix version 2.1:
/* .IP "\fBsmtpd_client_connection_count_limit (50)\fR"
/* How many simultaneous connections any SMTP client is allowed to
/* make to the SMTP service.
/* .IP "\fBsmtpd_client_connection_rate_limit (0)\fR"
/* The maximal number of connection attempts any client is allowed to
/* make to this service per time unit.
/* .IP "\fBsmtpd_client_connection_limit_exceptions ($mynetworks)\fR"
/* Clients that are excluded from connection count or connection rate
/* restrictions.
/* TARPIT CONTROLS
/* .ad
/* .fi
/* When a remote SMTP client makes errors, the Postfix SMTP server
/* can insert delays before responding. This can help to slow down
/* run-away software. The behavior is controlled by an error counter
/* that counts the number of errors within an SMTP session that a
/* client makes without delivering mail.
/* .IP "\fBsmtpd_error_sleep_time (1s)\fR"
/* With Postfix 2.1 and later: the SMTP server response delay after
/* a client has made more than $smtpd_soft_error_limit errors, and
/* fewer than $smtpd_hard_error_limit errors, without delivering mail.
/* .IP "\fBsmtpd_soft_error_limit (10)\fR"
/* The number of errors a remote SMTP client is allowed to make without
/* delivering mail before the Postfix SMTP server slows down all its
/* responses.
/* .IP "\fBsmtpd_hard_error_limit (20)\fR"
/* The maximal number of errors a remote SMTP client is allowed to
/* make without delivering mail.
/* .IP "\fBsmtpd_junk_command_limit (100)\fR"
/* The number of junk commands (NOOP, VRFY, ETRN or RSET) that a remote
/* SMTP client can send before the Postfix SMTP server starts to
/* increment the error counter with each junk command.
/* .PP
/* Available in Postfix version 2.1 and later:
/* .IP "\fBsmtpd_recipient_overshoot_limit (1000)\fR"
/* The number of recipients that a remote SMTP client can send in
/* excess of the limit specified with $smtpd_recipient_limit, before
/* the Postfix SMTP server increments the per-session error count
/* for each excess recipient.
/* ACCESS POLICY DELEGATION CONTROLS
/* .ad
/* .fi
/* As of version 2.1, Postfix can be configured to delegate access
/* policy decisions to an external server that runs outside Postfix.
/* See the file SMTPD_POLICY_README for more information.
/* .IP "\fBsmtpd_policy_service_max_idle (300s)\fR"
/* The time after which an idle SMTPD policy service connection is
/* closed.
/* .IP "\fBsmtpd_policy_service_max_ttl (1000s)\fR"
/* The time after which an active SMTPD policy service connection is
/* closed.
/* .IP "\fBsmtpd_policy_service_timeout (100s)\fR"
/* The time limit for connecting to, writing to or receiving from a
/* delegated SMTPD policy server.
/* ACCESS CONTROLS
/* .ad
/* .fi
/* The SMTPD_ACCESS_README document gives an introduction to all the
/* SMTP server access control features.
/* .IP "\fBsmtpd_delay_reject (yes)\fR"
/* Wait until the RCPT TO command before evaluating
/* $smtpd_client_restrictions, $smtpd_helo_restrictions and
/* $smtpd_sender_restrictions, or wait until the ETRN command before
/* evaluating $smtpd_client_restrictions and $smtpd_helo_restrictions.
/* .IP "\fBparent_domain_matches_subdomains (see 'postconf -d' output)\fR"
/* What Postfix features match subdomains of "domain.tld" automatically,
/* instead of requiring an explicit ".domain.tld" pattern.
/* .IP "\fBsmtpd_client_restrictions (empty)\fR"
/* Optional SMTP server access restrictions in the context of a client
/* SMTP connection request.
/* .IP "\fBsmtpd_helo_required (no)\fR"
/* Require that a remote SMTP client introduces itself at the beginning
/* of an SMTP session with the HELO or EHLO command.
/* .IP "\fBsmtpd_helo_restrictions (empty)\fR"
/* Optional restrictions that the Postfix SMTP server applies in the
/* context of the SMTP HELO command.
/* .IP "\fBsmtpd_sender_restrictions (empty)\fR"
/* Optional restrictions that the Postfix SMTP server applies in the
/* context of the MAIL FROM command.
/* .IP "\fBsmtpd_recipient_restrictions (permit_mynetworks, reject_unauth_destination)\fR"
/* The access restrictions that the Postfix SMTP server applies in
/* the context of the RCPT TO command.
/* .IP "\fBsmtpd_etrn_restrictions (empty)\fR"
/* Optional SMTP server access restrictions in the context of a client
/* ETRN request.
/* .IP "\fBallow_untrusted_routing (no)\fR"
/* Forward mail with sender-specified routing (user[@%!]remote[@%!]site)
/* from untrusted clients to destinations matching $relay_domains.
/* .IP "\fBsmtpd_restriction_classes (empty)\fR"
/* User-defined aliases for groups of access restrictions.
/* .IP "\fBsmtpd_null_access_lookup_key (<>)\fR"
/* The lookup key to be used in SMTP access(5) tables instead of the
/* null sender address.
/* .IP "\fBpermit_mx_backup_networks (empty)\fR"
/* Restrict the use of the permit_mx_backup SMTP access feature to
/* only domains whose primary MX hosts match the listed networks.
/* .PP
/* Available in Postfix version 2.0 and later:
/* .IP "\fBsmtpd_data_restrictions (empty)\fR"
/* Optional access restrictions that the Postfix SMTP server applies
/* in the context of the SMTP DATA command.
/* .IP "\fBsmtpd_expansion_filter (see 'postconf -d' output)\fR"
/* What characters are allowed in $name expansions of RBL reply
/* templates.
/* .PP
/* Available in Postfix version 2.1 and later:
/* .IP "\fBsmtpd_reject_unlisted_sender (no)\fR"
/* Request that the Postfix SMTP server rejects mail from unknown
/* sender addresses, even when no explicit reject_unlisted_sender
/* access restriction is specified.
/* .IP "\fBsmtpd_reject_unlisted_recipient (yes)\fR"
/* Request that the Postfix SMTP server rejects mail for unknown
/* recipient addresses, even when no explicit reject_unlisted_recipient
/* access restriction is specified.
/* SENDER AND RECIPIENT ADDRESS VERIFICATION CONTROLS
/* .ad
/* .fi
/* Postfix version 2.1 introduces sender and recipient address verification.
/* This feature is implemented by sending probe email messages that
/* are not actually delivered.
/* This feature is requested via the reject_unverified_sender and
/* reject_unverified_recipient access restrictions. The status of
/* verification probes is maintained by the verify(8) server.
/* See the file ADDRESS_VERIFICATION_README for information
/* about how to configure and operate the Postfix sender/recipient
/* address verification service.
/* .IP "\fBaddress_verify_poll_count (3)\fR"
/* How many times to query the verify(8) service for the completion
/* of an address verification request in progress.
/* .IP "\fBaddress_verify_poll_delay (3s)\fR"
/* The delay between queries for the completion of an address
/* verification request in progress.
/* .IP "\fBaddress_verify_sender (postmaster)\fR"
/* The sender address to use in address verification probes.
/* .IP "\fBunverified_sender_reject_code (450)\fR"
/* The numerical Postfix SMTP server response code when a recipient
/* address is rejected by the reject_unverified_sender restriction.
/* .IP "\fBunverified_recipient_reject_code (450)\fR"
/* The numerical Postfix SMTP server response when a recipient address
/* is rejected by the reject_unverified_recipient restriction.
/* ACCESS CONTROL RESPONSES
/* .ad
/* .fi
/* The following parameters control numerical SMTP reply codes
/* and/or text responses.
/* .IP "\fBaccess_map_reject_code (554)\fR"
/* The numerical Postfix SMTP server response code when a client
/* is rejected by an access(5) map restriction.
/* .IP "\fBdefer_code (450)\fR"
/* The numerical Postfix SMTP server response code when a remote SMTP
/* client request is rejected by the "defer" restriction.
/* .IP "\fBinvalid_hostname_reject_code (501)\fR"
/* The numerical Postfix SMTP server response code when the client
/* HELO or EHLO command parameter is rejected by the reject_invalid_hostname
/* restriction.
/* .IP "\fBmaps_rbl_reject_code (554)\fR"
/* The numerical Postfix SMTP server response code when a remote SMTP
/* client request is blocked by the reject_rbl_client, reject_rhsbl_client,
/* reject_rhsbl_sender or reject_rhsbl_recipient restriction.
/* .IP "\fBnon_fqdn_reject_code (504)\fR"
/* The numerical Postfix SMTP server reply code when a client request
/* is rejected by the reject_non_fqdn_hostname, reject_non_fqdn_sender
/* or reject_non_fqdn_recipient restriction.
/* .IP "\fBreject_code (554)\fR"
/* The numerical Postfix SMTP server response code when a remote SMTP
/* client request is rejected by the "\fBreject\fR" restriction.
/* .IP "\fBrelay_domains_reject_code (554)\fR"
/* The numerical Postfix SMTP server response code when a client
/* request is rejected by the reject_unauth_destination recipient
/* restriction.
/* .IP "\fBunknown_address_reject_code (450)\fR"
/* The numerical Postfix SMTP server response code when a sender or
/* recipient address is rejected by the reject_unknown_sender_domain
/* or reject_unknown_recipient_domain restriction.
/* .IP "\fBunknown_client_reject_code (450)\fR"
/* The numerical Postfix SMTP server response code when a client
/* without valid address <=> name mapping is rejected by the
/* reject_unknown_client restriction.
/* .IP "\fBunknown_hostname_reject_code (450)\fR"
/* The numerical Postfix SMTP server response code when the hostname
/* specified with the HELO or EHLO command is rejected by the
/* reject_unknown_hostname restriction.
/* .PP
/* Available in Postfix version 2.0 and later:
/* .IP "\fBdefault_rbl_reply (see 'postconf -d' output)\fR"
/* The default SMTP server response template for a request that is
/* rejected by an RBL-based restriction.
/* .IP "\fBmulti_recipient_bounce_reject_code (550)\fR"
/* The numerical Postfix SMTP server response code when a remote SMTP
/* client request is blocked by the reject_multi_recipient_bounce
/* restriction.
/* .IP "\fBrbl_reply_maps (empty)\fR"
/* Optional lookup tables with RBL response templates.
/* MISCELLANEOUS CONTROLS
/* .ad
/* .fi
/* .IP "\fBconfig_directory (see 'postconf -d' output)\fR"
/* The default location of the Postfix main.cf and master.cf
/* configuration files.
/* .IP "\fBdaemon_timeout (18000s)\fR"
/* How much time a Postfix daemon process may take to handle a
/* request before it is terminated by a built-in watchdog timer.
/* .IP "\fBcommand_directory (see 'postconf -d' output)\fR"
/* The location of all postfix administrative commands.
/* .IP "\fBdouble_bounce_sender (double-bounce)\fR"
/* The sender address of postmaster notifications that are generated
/* by the mail system.
/* .IP "\fBipc_timeout (3600s)\fR"
/* The time limit for sending or receiving information over an internal
/* communication channel.
/* .IP "\fBmail_name (Postfix)\fR"
/* The mail system name that is displayed in Received: headers, in
/* the SMTP greeting banner, and in bounced mail.
/* .IP "\fBmail_owner (postfix)\fR"
/* The UNIX system account that owns the Postfix queue and most Postfix
/* daemon processes.
/* .IP "\fBmax_idle (100s)\fR"
/* The maximum amount of time that an idle Postfix daemon process
/* waits for the next service request before exiting.
/* .IP "\fBmax_use (100)\fR"
/* The maximal number of connection requests before a Postfix daemon
/* process terminates.
/* .IP "\fBmyhostname (see 'postconf -d' output)\fR"
/* The internet hostname of this mail system.
/* .IP "\fBmynetworks (see 'postconf -d' output)\fR"
/* The list of "trusted" SMTP clients that have more privileges than
/* "strangers".
/* .IP "\fBmyorigin ($myhostname)\fR"
/* The domain name that locally-posted mail appears to come
/* from, and that locally posted mail is delivered to.
/* .IP "\fBprocess_id (read-only)\fR"
/* The process ID of a Postfix command or daemon process.
/* .IP "\fBprocess_name (read-only)\fR"
/* The process name of a Postfix command or daemon process.
/* .IP "\fBqueue_directory (see 'postconf -d' output)\fR"
/* The location of the Postfix top-level queue directory.
/* .IP "\fBrecipient_delimiter (empty)\fR"
/* The separator between user names and address extensions (user+foo).
/* .IP "\fBsmtpd_banner ($myhostname ESMTP $mail_name)\fR"
/* The text that follows the 220 status code in the SMTP greeting
/* banner.
/* .IP "\fBsyslog_facility (mail)\fR"
/* The syslog facility of Postfix logging.
/* .IP "\fBsyslog_name (postfix)\fR"
/* The mail system name that is prepended to the process name in syslog
/* records, so that "smtpd" becomes, for example, "postfix/smtpd".
/* SEE ALSO
/* cleanup(8), message canonicalization
/* trivial-rewrite(8), address resolver
/* verify(8), address verification service
/* postconf(5), configuration parameters
/* master(8), process manager
/* syslogd(8), system logging
/* README FILES
/* .ad
/* .fi
/* Use "\fBpostconf readme_directory\fR" or
/* "\fBpostconf html_directory\fR" to locate this information.
/* .na
/* .nf
/* ADDRESS_CLASS_README, blocking unknown hosted or relay recipients
/* FILTER_README, external after-queue content filter
/* LOCAL_RECIPIENT_README, blocking unknown local recipients
/* SMTPD_ACCESS_README, built-in access policies
/* SMTPD_POLICY_README, external policy server
/* SMTPD_PROXY_README, external before-queue content filter
/* SASL_README, Postfix SASL howto
/* VERP_README, Postfix XVERP extension
/* XCLIENT_README, Postfix XCLIENT extension
/* XFORWARD_README, Postfix XFORWARD extension
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*--*/
/* System library. */
#include <sys_defs.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <string.h>
#include <stdio.h> /* remove() */
#include <unistd.h>
#include <stdlib.h>
#include <time.h>
#include <errno.h>
#include <ctype.h>
#include <signal.h>
#include <stddef.h> /* offsetof() */
#ifdef STRCASECMP_IN_STRINGS_H
#include <strings.h>
#endif
/* Utility library. */
#include <msg.h>
#include <mymalloc.h>
#include <vstring.h>
#include <vstream.h>
#include <vstring_vstream.h>
#include <stringops.h>
#include <events.h>
#include <smtp_stream.h>
#include <valid_hostname.h>
#include <dict.h>
#include <watchdog.h>
#include <iostuff.h>
#include <split_at.h>
#include <name_code.h>
/* Global library. */
#include <mail_params.h>
#include <record.h>
#include <rec_type.h>
#include <mail_proto.h>
#include <cleanup_user.h>
#include <mail_date.h>
#include <mail_conf.h>
#include <off_cvt.h>
#include <debug_peer.h>
#include <mail_error.h>
#include <flush_clnt.h>
#include <mail_stream.h>
#include <mail_queue.h>
#include <tok822.h>
#include <verp_sender.h>
#include <string_list.h>
#include <quote_822_local.h>
#include <lex_822.h>
#include <namadr_list.h>
#include <input_transp.h>
#ifdef SNAPSHOT
#include <anvil_clnt.h>
#endif
#include <flush_clnt.h>
/* Single-threaded server skeleton. */
#include <mail_server.h>
/* Application-specific */
#include <smtpd_token.h>
#include <smtpd.h>
#include <smtpd_check.h>
#include <smtpd_chat.h>
#include <smtpd_sasl_proto.h>
#include <smtpd_sasl_glue.h>
#include <smtpd_proxy.h>
/*
* Tunable parameters. Make sure that there is some bound on the length of
* an SMTP command, so that the mail system stays in control even when a
* malicious client sends commands of unreasonable length (qmail-dos-1).
* Make sure there is some bound on the number of recipients, so that the
* mail system stays in control even when a malicious client sends an
* unreasonable number of recipients (qmail-dos-2).
*/
int var_smtpd_rcpt_limit;
int var_smtpd_tmout;
int var_smtpd_soft_erlim;
int var_smtpd_hard_erlim;
int var_queue_minfree; /* XXX use off_t */
char *var_smtpd_banner;
char *var_notify_classes;
char *var_client_checks;
char *var_helo_checks;
char *var_mail_checks;
char *var_rcpt_checks;
char *var_etrn_checks;
char *var_data_checks;
int var_unk_client_code;
int var_bad_name_code;
int var_unk_name_code;
int var_unk_addr_code;
int var_relay_code;
int var_maps_rbl_code;
int var_access_map_code;
char *var_maps_rbl_domains;
char *var_rbl_reply_maps;
int var_helo_required;
int var_reject_code;
int var_defer_code;
int var_smtpd_err_sleep;
int var_non_fqdn_code;
char *var_error_rcpt;
int var_smtpd_delay_reject;
char *var_rest_classes;
int var_strict_rfc821_env;
bool var_disable_vrfy_cmd;
char *var_canonical_maps;
char *var_rcpt_canon_maps;
char *var_virt_alias_maps;
char *var_virt_mailbox_maps;
char *var_alias_maps;
char *var_local_rcpt_maps;
bool var_allow_untrust_route;
int var_smtpd_junk_cmd_limit;
int var_smtpd_rcpt_overlim;
bool var_smtpd_sasl_enable;
char *var_smtpd_sasl_opts;
char *var_smtpd_sasl_appname;
char *var_smtpd_sasl_realm;
char *var_smtpd_sasl_exceptions_networks;
char *var_filter_xport;
bool var_broken_auth_clients;
char *var_perm_mx_networks;
char *var_smtpd_snd_auth_maps;
char *var_smtpd_noop_cmds;
char *var_smtpd_null_key;
int var_smtpd_hist_thrsh;
char *var_smtpd_exp_filter;
char *var_def_rbl_reply;
int var_unv_from_code;
int var_unv_rcpt_code;
int var_mul_rcpt_code;
char *var_relay_rcpt_maps;
char *var_verify_sender;
int var_local_rcpt_code;
int var_virt_alias_code;
int var_virt_mailbox_code;
int var_relay_rcpt_code;
char *var_verp_clients;
int var_show_unk_rcpt_table;
int var_verify_poll_count;
int var_verify_poll_delay;
char *var_smtpd_proxy_filt;
int var_smtpd_proxy_tmout;
char *var_smtpd_proxy_ehlo;
char *var_input_transp;
int var_smtpd_policy_tmout;
int var_smtpd_policy_idle;
int var_smtpd_policy_ttl;
char *var_xclient_hosts;
char *var_xforward_hosts;
bool var_smtpd_rej_unl_from;
bool var_smtpd_rej_unl_rcpt;
#ifdef SNAPSHOT
int var_smtpd_crate_limit;
int var_smtpd_cconn_limit;
char *var_smtpd_hoggers;
#endif
/*
* Silly little macros.
*/
#define STR(x) vstring_str(x)
#define LEN(x) VSTRING_LEN(x)
/*
* VERP command name.
*/
#define VERP_CMD "XVERP"
#define VERP_CMD_LEN 5
static NAMADR_LIST *verp_clients;
/*
* XCLIENT command. Access control is cached, so that XCLIENT can't override
* its own access control.
*/
static NAMADR_LIST *xclient_hosts;
static int xclient_allowed;
/*
* XFORWARD command. Access control is cached.
*/
static NAMADR_LIST *xforward_hosts;
static int xforward_allowed;
/*
* Client connection and rate limiting.
*/
#ifdef SNAPSHOT
ANVIL_CLNT *anvil_clnt;
static NAMADR_LIST *hogger_list;
#endif
/*
* Other application-specific globals.
*/
int smtpd_input_transp_mask;
/*
* Forward declarations.
*/
static void helo_reset(SMTPD_STATE *);
static void mail_reset(SMTPD_STATE *);
static void rcpt_reset(SMTPD_STATE *);
static void chat_reset(SMTPD_STATE *, int);
/*
* This filter is applied after printable().
*/
#define NEUTER_CHARACTERS " <>()\\\";:@"
#ifdef USE_SASL_AUTH
/*
* SASL exceptions.
*/
static NAMADR_LIST *sasl_exceptions_networks;
/* sasl_client_exception - can we offer AUTH for this client */
static int sasl_client_exception(SMTPD_STATE *state)
{
int match;
/*
* This is to work around a Netscape mail client bug where it tries to
* use AUTH if available, even if user has not configured it. Returns
* TRUE if AUTH should be offered in the EHLO.
*/
if (sasl_exceptions_networks == 0)
return (0);
match = namadr_list_match(sasl_exceptions_networks,
state->name, state->addr);
if (msg_verbose)
msg_info("sasl_exceptions: %s[%s], match=%d",
state->name, state->addr, match);
return (match);
}
#endif
/* collapse_args - put arguments together again */
static void collapse_args(int argc, SMTPD_TOKEN *argv)
{
int i;
for (i = 1; i < argc; i++) {
vstring_strcat(argv[0].vstrval, " ");
vstring_strcat(argv[0].vstrval, argv[i].strval);
}
argv[0].strval = STR(argv[0].vstrval);
}
/* helo_cmd - process HELO command */
static int helo_cmd(SMTPD_STATE *state, int argc, SMTPD_TOKEN *argv)
{
char *err;
if (argc < 2) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "501 Syntax: HELO hostname");
return (-1);
}
if (argc > 2)
collapse_args(argc - 1, argv + 1);
if (SMTPD_STAND_ALONE(state) == 0
&& var_smtpd_delay_reject == 0
&& (err = smtpd_check_helo(state, argv[1].strval)) != 0) {
smtpd_chat_reply(state, "%s", err);
return (-1);
}
if (state->helo_name != 0)
helo_reset(state);
chat_reset(state, var_smtpd_hist_thrsh);
mail_reset(state);
rcpt_reset(state);
state->helo_name = mystrdup(printable(argv[1].strval, '?'));
neuter(state->helo_name, NEUTER_CHARACTERS, '?');
/* Downgrading the protocol name breaks the unauthorized pipelining test. */
if (strcasecmp(state->protocol, MAIL_PROTO_ESMTP) != 0
&& strcasecmp(state->protocol, MAIL_PROTO_SMTP) != 0) {
myfree(state->protocol);
state->protocol = mystrdup(MAIL_PROTO_SMTP);
}
smtpd_chat_reply(state, "250 %s", var_myhostname);
return (0);
}
/* ehlo_cmd - process EHLO command */
static int ehlo_cmd(SMTPD_STATE *state, int argc, SMTPD_TOKEN *argv)
{
char *err;
/*
* XXX 2821 new feature: Section 4.1.4 specifies that a server must clear
* all buffers and reset the state exactly as if a RSET command had been
* issued.
*/
if (argc < 2) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "501 Syntax: EHLO hostname");
return (-1);
}
if (argc > 2)
collapse_args(argc - 1, argv + 1);
if (SMTPD_STAND_ALONE(state) == 0
&& var_smtpd_delay_reject == 0
&& (err = smtpd_check_helo(state, argv[1].strval)) != 0) {
smtpd_chat_reply(state, "%s", err);
return (-1);
}
if (state->helo_name != 0)
helo_reset(state);
chat_reset(state, var_smtpd_hist_thrsh);
mail_reset(state);
rcpt_reset(state);
state->helo_name = mystrdup(printable(argv[1].strval, '?'));
neuter(state->helo_name, NEUTER_CHARACTERS, '?');
if (strcasecmp(state->protocol, MAIL_PROTO_ESMTP) != 0) {
myfree(state->protocol);
state->protocol = mystrdup(MAIL_PROTO_ESMTP);
}
smtpd_chat_reply(state, "250-%s", var_myhostname);
smtpd_chat_reply(state, "250-PIPELINING");
if (var_message_limit)
smtpd_chat_reply(state, "250-SIZE %lu",
(unsigned long) var_message_limit); /* XXX */
else
smtpd_chat_reply(state, "250-SIZE");
if (var_disable_vrfy_cmd == 0)
smtpd_chat_reply(state, "250-VRFY");
smtpd_chat_reply(state, "250-ETRN");
#ifdef USE_SASL_AUTH
if (var_smtpd_sasl_enable && !sasl_client_exception(state)) {
smtpd_chat_reply(state, "250-AUTH %s", state->sasl_mechanism_list);
if (var_broken_auth_clients)
smtpd_chat_reply(state, "250-AUTH=%s", state->sasl_mechanism_list);
}
#endif
if (namadr_list_match(verp_clients, state->name, state->addr))
smtpd_chat_reply(state, "250-%s", VERP_CMD);
/* XCLIENT must not override its own access control. */
if (xclient_allowed)
smtpd_chat_reply(state, "250-" XCLIENT_CMD
" " XCLIENT_NAME " " XCLIENT_ADDR
" " XCLIENT_PROTO " " XCLIENT_HELO);
if (xforward_allowed)
smtpd_chat_reply(state, "250-" XFORWARD_CMD
" " XFORWARD_NAME " " XFORWARD_ADDR
" " XFORWARD_PROTO " " XFORWARD_HELO);
smtpd_chat_reply(state, "250 8BITMIME");
return (0);
}
/* helo_reset - reset HELO/EHLO command stuff */
static void helo_reset(SMTPD_STATE *state)
{
if (state->helo_name)
myfree(state->helo_name);
state->helo_name = 0;
}
/* mail_open_stream - open mail queue file or IPC stream */
static void mail_open_stream(SMTPD_STATE *state)
{
char *postdrop_command;
int cleanup_flags;
/*
* XXX 2821: An SMTP server is not allowed to "clean up" mail except in
* the case of original submissions. Presently, Postfix always runs all
* mail through the cleanup server.
*
* We could approximate the RFC as follows: Postfix rewrites mail if it
* comes from a source that we are willing to relay for. This way, we
* avoid rewriting most mail that comes from elsewhere. However, that
* requires moving functionality away from the cleanup daemon elsewhere,
* such as virtual address expansion, and header/body pattern matching.
*/
/*
* If running from the master or from inetd, connect to the cleanup
* service.
*/
cleanup_flags = CLEANUP_FLAG_MASK_EXTERNAL;
if (smtpd_input_transp_mask & INPUT_TRANSP_ADDRESS_MAPPING)
cleanup_flags &= ~(CLEANUP_FLAG_BCC_OK | CLEANUP_FLAG_MAP_OK);
if (smtpd_input_transp_mask & INPUT_TRANSP_HEADER_BODY)
cleanup_flags &= ~CLEANUP_FLAG_FILTER;
if (SMTPD_STAND_ALONE(state) == 0) {
state->dest = mail_stream_service(MAIL_CLASS_PUBLIC,
var_cleanup_service);
if (state->dest == 0
|| attr_print(state->dest->stream, ATTR_FLAG_NONE,
ATTR_TYPE_NUM, MAIL_ATTR_FLAGS, cleanup_flags,
ATTR_TYPE_END) != 0)
msg_fatal("unable to connect to the %s %s service",
MAIL_CLASS_PUBLIC, var_cleanup_service);
}
/*
* Otherwise, pipe the message through the privileged postdrop helper.
* XXX Make postdrop a manifest constant.
*/
else {
postdrop_command = concatenate(var_command_dir, "/postdrop",
msg_verbose ? " -v" : (char *) 0, (char *) 0);
state->dest = mail_stream_command(postdrop_command);
if (state->dest == 0)
msg_fatal("unable to execute %s", postdrop_command);
myfree(postdrop_command);
}
state->cleanup = state->dest->stream;
state->queue_id = mystrdup(state->dest->id);
/*
* Record the time of arrival, the sender envelope address, some session
* information, and some additional attributes.
*/
if (SMTPD_STAND_ALONE(state) == 0) {
rec_fprintf(state->cleanup, REC_TYPE_TIME, "%ld", state->time);
if (*var_filter_xport)
rec_fprintf(state->cleanup, REC_TYPE_FILT, "%s", var_filter_xport);
}
rec_fputs(state->cleanup, REC_TYPE_FROM, state->sender);
if (state->encoding != 0)
rec_fprintf(state->cleanup, REC_TYPE_ATTR, "%s=%s",
MAIL_ATTR_ENCODING, state->encoding);
/*
* Store the client attributes for logging purposes.
*/
if (SMTPD_STAND_ALONE(state) == 0) {
if (IS_AVAIL_CLIENT_NAME(FORWARD_NAME(state)))
rec_fprintf(state->cleanup, REC_TYPE_ATTR, "%s=%s",
MAIL_ATTR_CLIENT_NAME, FORWARD_NAME(state));
if (IS_AVAIL_CLIENT_ADDR(FORWARD_ADDR(state)))
rec_fprintf(state->cleanup, REC_TYPE_ATTR, "%s=%s",
MAIL_ATTR_CLIENT_ADDR, FORWARD_ADDR(state));
if (IS_AVAIL_CLIENT_NAMADDR(FORWARD_NAMADDR(state)))
rec_fprintf(state->cleanup, REC_TYPE_ATTR, "%s=%s",
MAIL_ATTR_ORIGIN, FORWARD_NAMADDR(state));
if (IS_AVAIL_CLIENT_HELO(FORWARD_HELO(state)))
rec_fprintf(state->cleanup, REC_TYPE_ATTR, "%s=%s",
MAIL_ATTR_HELO_NAME, FORWARD_HELO(state));
if (IS_AVAIL_CLIENT_PROTO(FORWARD_PROTO(state)))
rec_fprintf(state->cleanup, REC_TYPE_ATTR, "%s=%s",
MAIL_ATTR_PROTO_NAME, FORWARD_PROTO(state));
}
if (state->verp_delims)
rec_fputs(state->cleanup, REC_TYPE_VERP, state->verp_delims);
}
/* extract_addr - extract address from rubble */
static char *extract_addr(SMTPD_STATE *state, SMTPD_TOKEN *arg,
int allow_empty_addr, int strict_rfc821)
{
char *myname = "extract_addr";
TOK822 *tree;
TOK822 *tp;
TOK822 *addr = 0;
int naddr;
int non_addr;
char *err = 0;
char *junk = 0;
char *text;
char *colon;
/*
* Special case.
*/
#define PERMIT_EMPTY_ADDR 1
#define REJECT_EMPTY_ADDR 0
/*
* Some mailers send RFC822-style address forms (with comments and such)
* in SMTP envelopes. We cannot blame users for this: the blame is with
* programmers violating the RFC, and with sendmail for being permissive.
*
* XXX The SMTP command tokenizer must leave the address in externalized
* (quoted) form, so that the address parser can correctly extract the
* address from surrounding junk.
*
* XXX We have only one address parser, written according to the rules of
* RFC 822. That standard differs subtly from RFC 821.
*/
if (msg_verbose)
msg_info("%s: input: %s", myname, STR(arg->vstrval));
if (STR(arg->vstrval)[0] == '<'
&& STR(arg->vstrval)[LEN(arg->vstrval) - 1] == '>') {
junk = text = mystrndup(STR(arg->vstrval) + 1, LEN(arg->vstrval) - 2);
} else
text = STR(arg->vstrval);
/*
* Truncate deprecated route address form.
*/
if (*text == '@' && (colon = strchr(text, ':')) != 0)
text = colon + 1;
tree = tok822_parse(text);
if (junk)
myfree(junk);
/*
* Find trouble.
*/
for (naddr = non_addr = 0, tp = tree; tp != 0; tp = tp->next) {
if (tp->type == TOK822_ADDR) {
addr = tp;
naddr += 1; /* count address forms */
} else if (tp->type == '<' || tp->type == '>') {
/* void */ ; /* ignore brackets */
} else {
non_addr += 1; /* count non-address forms */
}
}
/*
* Report trouble. Log a warning only if we are going to sleep+reject so
* that attackers can't flood our logfiles.
*/
if (naddr > 1
|| (strict_rfc821 && (non_addr || *STR(arg->vstrval) != '<'))) {
msg_warn("Illegal address syntax from %s in %s command: %s",
state->namaddr, state->where, STR(arg->vstrval));
err = "501 Bad address syntax";
}
/*
* Overwrite the input with the extracted address. This seems bad design,
* but we really are not going to use the original data anymore. What we
* start with is quoted (external) form, and what we need is unquoted
* (internal form).
*/
if (addr)
tok822_internalize(arg->vstrval, addr->head, TOK822_STR_DEFL);
else
vstring_strcpy(arg->vstrval, "");
arg->strval = STR(arg->vstrval);
/*
* Report trouble. Log a warning only if we are going to sleep+reject so
* that attackers can't flood our logfiles.
*/
if (err == 0)
if ((arg->strval[0] == 0 && !allow_empty_addr)
|| (strict_rfc821 && arg->strval[0] == '@')
|| (SMTPD_STAND_ALONE(state) == 0
&& smtpd_check_addr(STR(arg->vstrval)) != 0)) {
msg_warn("Illegal address syntax from %s in %s command: %s",
state->namaddr, state->where, STR(arg->vstrval));
err = "501 Bad address syntax";
}
/*
* Cleanup.
*/
tok822_free_tree(tree);
if (msg_verbose)
msg_info("%s: result: %s", myname, STR(arg->vstrval));
return (err);
}
/* mail_cmd - process MAIL command */
static int mail_cmd(SMTPD_STATE *state, int argc, SMTPD_TOKEN *argv)
{
char *err;
int narg;
char *arg;
char *verp_delims = 0;
state->encoding = 0;
/*
* Sanity checks.
*
* XXX 2821 pedantism: Section 4.1.2 says that SMTP servers that receive a
* command in which invalid character codes have been employed, and for
* which there are no other reasons for rejection, MUST reject that
* command with a 501 response. So much for the principle of "be liberal
* in what you accept, be strict in what you send".
*/
if (var_helo_required && state->helo_name == 0) {
state->error_mask |= MAIL_ERROR_POLICY;
smtpd_chat_reply(state, "503 Error: send HELO/EHLO first");
return (-1);
}
#define IN_MAIL_TRANSACTION(state) ((state)->sender != 0)
if (IN_MAIL_TRANSACTION(state)) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "503 Error: nested MAIL command");
return (-1);
}
if (argc < 3
|| strcasecmp(argv[1].strval, "from:") != 0) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "501 Syntax: MAIL FROM: <address>");
return (-1);
}
if (argv[2].tokval == SMTPD_TOK_ERROR) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "501 Bad sender address syntax");
return (-1);
}
if ((err = extract_addr(state, argv + 2, PERMIT_EMPTY_ADDR, var_strict_rfc821_env)) != 0) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "%s", err);
return (-1);
}
for (narg = 3; narg < argc; narg++) {
arg = argv[narg].strval;
if (strcasecmp(arg, "BODY=8BITMIME") == 0) { /* RFC 1652 */
state->encoding = MAIL_ATTR_ENC_8BIT;
} else if (strcasecmp(arg, "BODY=7BIT") == 0) { /* RFC 1652 */
state->encoding = MAIL_ATTR_ENC_7BIT;
} else if (strncasecmp(arg, "SIZE=", 5) == 0) { /* RFC 1870 */
/* Reject non-numeric size. */
if (!alldig(arg + 5)) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "501 Bad message size syntax");
return (-1);
}
/* Reject size overflow. */
if ((state->msg_size = off_cvt_string(arg + 5)) < 0) {
smtpd_chat_reply(state, "552 Message size exceeds file system imposed limit");
state->error_mask |= MAIL_ERROR_POLICY;
return (-1);
}
#ifdef USE_SASL_AUTH
} else if (var_smtpd_sasl_enable && strncasecmp(arg, "AUTH=", 5) == 0) {
if ((err = smtpd_sasl_mail_opt(state, arg + 5)) != 0) {
smtpd_chat_reply(state, "%s", err);
return (-1);
}
#endif
} else if (namadr_list_match(verp_clients, state->name, state->addr)
&& strncasecmp(arg, VERP_CMD, VERP_CMD_LEN) == 0
&& (arg[VERP_CMD_LEN] == '=' || arg[VERP_CMD_LEN] == 0)) {
if (arg[VERP_CMD_LEN] == 0) {
verp_delims = var_verp_delims;
} else {
verp_delims = arg + VERP_CMD_LEN + 1;
if (verp_delims_verify(verp_delims) != 0) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "501 Error: %s needs two characters from %s",
VERP_CMD, var_verp_filter);
return (-1);
}
}
} else {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "555 Unsupported option: %s", arg);
return (-1);
}
}
if (verp_delims && argv[2].strval[0] == 0) {
smtpd_chat_reply(state, "503 Error: %s requires non-null sender",
VERP_CMD);
return (-1);
}
if (SMTPD_STAND_ALONE(state) == 0
&& var_smtpd_delay_reject == 0
&& (err = smtpd_check_mail(state, argv[2].strval)) != 0) {
smtpd_chat_reply(state, "%s", err);
/* XXX Reset access map side effects. */
mail_reset(state);
return (-1);
}
/*
* Check the queue file space, if applicable.
*/
if (!USE_SMTPD_PROXY(state)) {
if ((err = smtpd_check_size(state, state->msg_size)) != 0) {
smtpd_chat_reply(state, "%s", err);
return (-1);
}
}
/*
* No more early returns. The mail transaction is in progress.
*/
state->time = time((time_t *) 0);
state->sender = mystrdup(argv[2].strval);
vstring_sprintf(state->instance, "%x.%lx.%x",
var_pid, (unsigned long) state->time, state->seqno++);
if (verp_delims)
state->verp_delims = mystrdup(verp_delims);
if (USE_SMTPD_PROXY(state))
state->proxy_mail = mystrdup(STR(state->buffer));
smtpd_chat_reply(state, "250 Ok");
return (0);
}
/* mail_reset - reset MAIL command stuff */
static void mail_reset(SMTPD_STATE *state)
{
state->msg_size = 0;
/*
* Unceremoniously close the pipe to the cleanup service. The cleanup
* service will delete the queue file when it detects a premature
* end-of-file condition on input.
*/
if (state->cleanup != 0) {
mail_stream_cleanup(state->dest);
state->dest = 0;
state->cleanup = 0;
}
state->err = 0;
if (state->queue_id != 0) {
myfree(state->queue_id);
state->queue_id = 0;
}
if (state->sender) {
myfree(state->sender);
state->sender = 0;
}
if (state->verp_delims) {
myfree(state->verp_delims);
state->verp_delims = 0;
}
if (state->proxy_mail) {
myfree(state->proxy_mail);
state->proxy_mail = 0;
}
if (state->saved_filter) {
myfree(state->saved_filter);
state->saved_filter = 0;
}
if (state->saved_redirect) {
myfree(state->saved_redirect);
state->saved_redirect = 0;
}
state->saved_flags = 0;
#ifdef USE_SASL_AUTH
if (var_smtpd_sasl_enable)
smtpd_sasl_mail_reset(state);
#endif
state->discard = 0;
VSTRING_RESET(state->instance);
VSTRING_TERMINATE(state->instance);
/*
* Try to be nice. Don't bother when we lost the connection. Don't bother
* waiting for a reply, it just increases latency.
*/
if (state->proxy) {
(void) smtpd_proxy_cmd(state, SMTPD_PROX_WANT_NONE, "QUIT");
smtpd_proxy_close(state);
}
if (state->xforward.flags)
smtpd_xforward_reset(state);
if (state->prepend)
state->prepend = argv_free(state->prepend);
}
/* rcpt_cmd - process RCPT TO command */
static int rcpt_cmd(SMTPD_STATE *state, int argc, SMTPD_TOKEN *argv)
{
char *err;
int narg;
char *arg;
/*
* Sanity checks.
*
* XXX 2821 pedantism: Section 4.1.2 says that SMTP servers that receive a
* command in which invalid character codes have been employed, and for
* which there are no other reasons for rejection, MUST reject that
* command with a 501 response. So much for the principle of "be liberal
* in what you accept, be strict in what you send".
*/
if (!IN_MAIL_TRANSACTION(state)) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "503 Error: need MAIL command");
return (-1);
}
if (argc < 3
|| strcasecmp(argv[1].strval, "to:") != 0) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "501 Syntax: RCPT TO: <address>");
return (-1);
}
if (argv[2].tokval == SMTPD_TOK_ERROR) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "501 Bad recipient address syntax");
return (-1);
}
if ((err = extract_addr(state, argv + 2, REJECT_EMPTY_ADDR, var_strict_rfc821_env)) != 0) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "%s", err);
return (-1);
}
for (narg = 3; narg < argc; narg++) {
arg = argv[narg].strval;
if (1) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "555 Unsupported option: %s", arg);
return (-1);
}
}
if (var_smtpd_rcpt_limit && state->rcpt_count >= var_smtpd_rcpt_limit) {
smtpd_chat_reply(state, "452 Error: too many recipients");
if (state->rcpt_overshoot++ < var_smtpd_rcpt_overlim)
return (0);
state->error_mask |= MAIL_ERROR_POLICY;
return (-1);
}
if (SMTPD_STAND_ALONE(state) == 0) {
if ((err = smtpd_check_rcpt(state, argv[2].strval)) != 0) {
smtpd_chat_reply(state, "%s", err);
return (-1);
}
}
/*
* Don't access the proxy, queue file, or queue file writer process until
* we have a valid recipient address.
*/
if (state->proxy == 0 && state->cleanup == 0) {
if (state->proxy_mail) {
if (smtpd_proxy_open(state, var_smtpd_proxy_filt,
var_smtpd_proxy_tmout, var_smtpd_proxy_ehlo,
state->proxy_mail) != 0) {
smtpd_chat_reply(state, "%s", STR(state->proxy_buffer));
return (-1);
}
} else {
mail_open_stream(state);
}
/*
* Log the queue ID with the message origin.
*/
#ifdef USE_SASL_AUTH
if (var_smtpd_sasl_enable)
smtpd_sasl_mail_log(state);
else
#endif
msg_info("%s: client=%s", state->queue_id ?
state->queue_id : "NOQUEUE", FORWARD_NAMADDR(state));
}
/*
* Proxy the recipient. OK, so we lied. If the real-time proxy rejects
* the recipient then we can have a proxy connection without having
* accepted a recipient.
*/
if (state->proxy && smtpd_proxy_cmd(state, SMTPD_PROX_WANT_OK,
"%s", STR(state->buffer)) != 0) {
smtpd_chat_reply(state, "%s", STR(state->proxy_buffer));
return (-1);
}
/*
* Store the recipient. Remember the first one.
*
* Flush recipients to maintain a stiffer coupling with the next stage and
* to better utilize parallelism.
*/
state->rcpt_count++;
if (state->recipient == 0)
state->recipient = mystrdup(argv[2].strval);
if (state->cleanup) {
rec_fputs(state->cleanup, REC_TYPE_RCPT, argv[2].strval);
vstream_fflush(state->cleanup);
}
smtpd_chat_reply(state, "250 Ok");
return (0);
}
/* rcpt_reset - reset RCPT stuff */
static void rcpt_reset(SMTPD_STATE *state)
{
if (state->recipient) {
myfree(state->recipient);
state->recipient = 0;
}
state->rcpt_count = 0;
/* XXX Must flush the command history. */
state->rcpt_overshoot = 0;
}
/* data_cmd - process DATA command */
static int data_cmd(SMTPD_STATE *state, int argc, SMTPD_TOKEN *unused_argv)
{
char *err;
char *start;
int len;
int curr_rec_type;
int prev_rec_type;
int first = 1;
VSTRING *why = 0;
int saved_err;
int (*out_record) (VSTREAM *, int, const char *, int);
int (*out_fprintf) (VSTREAM *, int, const char *,...);
VSTREAM *out_stream;
int out_error;
char **cpp;
/*
* Sanity checks. With ESMTP command pipelining the client can send DATA
* before all recipients are rejected, so don't report that as a protocol
* error.
*/
if (state->rcpt_count == 0) {
if (!IN_MAIL_TRANSACTION(state)) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "503 Error: need RCPT command");
} else {
smtpd_chat_reply(state, "554 Error: no valid recipients");
}
return (-1);
}
if (argc != 1) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "501 Syntax: DATA");
return (-1);
}
if (SMTPD_STAND_ALONE(state) == 0 && (err = smtpd_check_data(state)) != 0) {
smtpd_chat_reply(state, "%s", err);
return (-1);
}
if (state->proxy && smtpd_proxy_cmd(state, SMTPD_PROX_WANT_MORE,
"%s", STR(state->buffer)) != 0) {
smtpd_chat_reply(state, "%s", STR(state->proxy_buffer));
return (-1);
}
/*
* One level of indirection to choose between normal or proxied
* operation. We want to avoid massive code duplication within tons of
* if-else clauses.
*/
if (state->proxy) {
out_stream = state->proxy;
out_record = smtpd_proxy_rec_put;
out_fprintf = smtpd_proxy_rec_fprintf;
out_error = CLEANUP_STAT_PROXY;
} else {
out_stream = state->cleanup;
out_record = rec_put;
out_fprintf = rec_fprintf;
out_error = CLEANUP_STAT_WRITE;
}
/*
* Flush out any access table actions that are delegated to the cleanup
* server, and that may trigger before we accept the first valid
* recipient.
*
* Terminate the message envelope segment. Start the message content
* segment, and prepend our own Received: header. If there is only one
* recipient, list the recipient address.
*/
if (state->cleanup) {
if (state->saved_filter)
rec_fprintf(state->cleanup, REC_TYPE_FILT, "%s", state->saved_filter);
if (state->saved_redirect)
rec_fprintf(state->cleanup, REC_TYPE_RDR, "%s", state->saved_redirect);
if (state->saved_flags)
rec_fprintf(state->cleanup, REC_TYPE_FLGS, "%d", state->saved_flags);
rec_fputs(state->cleanup, REC_TYPE_MESG, "");
}
/*
* PREPEND message headers.
*/
if (state->prepend)
for (cpp = state->prepend->argv; *cpp; cpp++)
out_fprintf(out_stream, REC_TYPE_NORM, "%s", *cpp);
/*
* Suppress our own Received: header in the unlikely case that we are an
* intermediate proxy.
*/
if (!state->proxy || state->xforward.flags == 0) {
out_fprintf(out_stream, REC_TYPE_NORM,
"Received: from %s (%s [%s])",
state->helo_name ? state->helo_name : state->name,
state->name, state->addr);
if (state->rcpt_count == 1 && state->recipient) {
out_fprintf(out_stream, REC_TYPE_NORM,
state->cleanup ? "\tby %s (%s) with %s id %s" :
"\tby %s (%s) with %s",
var_myhostname, var_mail_name,
state->protocol, state->queue_id);
quote_822_local(state->buffer, state->recipient);
out_fprintf(out_stream, REC_TYPE_NORM,
"\tfor <%s>; %s", STR(state->buffer), mail_date(state->time));
} else {
out_fprintf(out_stream, REC_TYPE_NORM,
state->cleanup ? "\tby %s (%s) with %s id %s;" :
"\tby %s (%s) with %s;",
var_myhostname, var_mail_name,
state->protocol, state->queue_id);
out_fprintf(out_stream, REC_TYPE_NORM,
"\t%s", mail_date(state->time));
}
#ifdef RECEIVED_ENVELOPE_FROM
quote_822_local(state->buffer, state->sender);
out_fprintf(out_stream, REC_TYPE_NORM,
"\t(envelope-from %s)", STR(state->buffer));
#endif
}
smtpd_chat_reply(state, "354 End data with <CR><LF>.<CR><LF>");
/*
* Copy the message content. If the cleanup process has a problem, keep
* reading until the remote stops sending, then complain. Produce typed
* records from the SMTP stream so we can handle data that spans buffers.
*
* XXX Force an empty record when the queue file content begins with
* whitespace, so that it won't be considered as being part of our own
* Received: header. What an ugly Kluge.
*
* XXX Deal with UNIX-style From_ lines at the start of message content
* because sendmail permits it.
*/
for (prev_rec_type = 0; /* void */ ; prev_rec_type = curr_rec_type) {
if (smtp_get(state->buffer, state->client, var_line_limit) == '\n')
curr_rec_type = REC_TYPE_NORM;
else
curr_rec_type = REC_TYPE_CONT;
start = vstring_str(state->buffer);
len = VSTRING_LEN(state->buffer);
if (first) {
if (strncmp(start + strspn(start, ">"), "From ", 5) == 0) {
out_fprintf(out_stream, curr_rec_type,
"X-Mailbox-Line: %s", start);
continue;
}
first = 0;
if (len > 0 && IS_SPACE_TAB(start[0]))
out_record(out_stream, REC_TYPE_NORM, "", 0);
}
if (prev_rec_type != REC_TYPE_CONT && *start == '.'
&& (state->proxy == 0 ? (++start, --len) == 0 : len == 1))
break;
if (state->err == CLEANUP_STAT_OK
&& out_record(out_stream, curr_rec_type, start, len) < 0)
state->err = out_error;
}
/*
* Send the end of DATA and finish the proxy connection. Set the
* CLEANUP_STAT_PROXY error flag in case of trouble.
*
* XXX The low-level proxy output routines should set "state" error
* attributes. This requires making "state" a context attribute of the
* VSTREAM.
*/
if (state->proxy) {
if (state->err == CLEANUP_STAT_OK) {
(void) smtpd_proxy_cmd(state, SMTPD_PROX_WANT_ANY, ".");
if (state->err == CLEANUP_STAT_OK &&
*STR(state->proxy_buffer) != '2')
state->err = CLEANUP_STAT_CONT;
} else {
state->error_mask |= MAIL_ERROR_SOFTWARE;
state->err |= CLEANUP_STAT_PROXY;
vstring_sprintf(state->proxy_buffer,
"451 Error: queue file write error");
}
}
/*
* Send the end-of-segment markers and finish the queue file record
* stream.
*/
else {
if (state->err == CLEANUP_STAT_OK)
if (rec_fputs(state->cleanup, REC_TYPE_XTRA, "") < 0
|| rec_fputs(state->cleanup, REC_TYPE_END, "") < 0
|| vstream_fflush(state->cleanup))
state->err = CLEANUP_STAT_WRITE;
if (state->err == 0) {
why = vstring_alloc(10);
state->err = mail_stream_finish(state->dest, why);
} else
mail_stream_cleanup(state->dest);
state->dest = 0;
state->cleanup = 0;
}
/*
* Handle any errors. One message may suffer from multiple errors, so
* complain only about the most severe error. Forgive any previous client
* errors when a message was received successfully.
*
* See also: qmqpd.c
*/
if (state->err == CLEANUP_STAT_OK) {
state->error_count = 0;
state->error_mask = 0;
state->junk_cmds = 0;
if (state->queue_id)
smtpd_chat_reply(state, "250 Ok: queued as %s", state->queue_id);
else
smtpd_chat_reply(state, "%s", STR(state->proxy_buffer));
} else if ((state->err & CLEANUP_STAT_BAD) != 0) {
state->error_mask |= MAIL_ERROR_SOFTWARE;
smtpd_chat_reply(state, "451 Error: internal error %d", state->err);
} else if ((state->err & CLEANUP_STAT_SIZE) != 0) {
state->error_mask |= MAIL_ERROR_BOUNCE;
smtpd_chat_reply(state, "552 Error: message too large");
} else if ((state->err & CLEANUP_STAT_HOPS) != 0) {
state->error_mask |= MAIL_ERROR_BOUNCE;
smtpd_chat_reply(state, "554 Error: too many hops");
} else if ((state->err & CLEANUP_STAT_CONT) != 0) {
state->error_mask |= MAIL_ERROR_POLICY;
if (state->proxy_buffer)
smtpd_chat_reply(state, "%s", STR(state->proxy_buffer));
else
smtpd_chat_reply(state, "550 Error: %s", LEN(why) ?
STR(why) : "content rejected");
} else if ((state->err & CLEANUP_STAT_WRITE) != 0) {
state->error_mask |= MAIL_ERROR_RESOURCE;
smtpd_chat_reply(state, "451 Error: queue file write error");
} else if ((state->err & CLEANUP_STAT_PROXY) != 0) {
state->error_mask |= MAIL_ERROR_SOFTWARE;
smtpd_chat_reply(state, "%s", STR(state->proxy_buffer));
} else {
state->error_mask |= MAIL_ERROR_SOFTWARE;
smtpd_chat_reply(state, "451 Error: internal error %d", state->err);
}
/*
* Disconnect after transmission must not be treated as "lost connection
* after DATA".
*/
state->where = SMTPD_AFTER_DOT;
/*
* Cleanup. The client may send another MAIL command.
*/
saved_err = state->err;
chat_reset(state, var_smtpd_hist_thrsh);
mail_reset(state);
rcpt_reset(state);
if (why)
vstring_free(why);
return (saved_err);
}
/* rset_cmd - process RSET */
static int rset_cmd(SMTPD_STATE *state, int argc, SMTPD_TOKEN *unused_argv)
{
/*
* Sanity checks.
*/
if (argc != 1) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "501 Syntax: RSET");
return (-1);
}
/*
* Restore state to right after HELO/EHLO command.
*/
chat_reset(state, var_smtpd_hist_thrsh);
mail_reset(state);
rcpt_reset(state);
smtpd_chat_reply(state, "250 Ok");
return (0);
}
/* noop_cmd - process NOOP */
static int noop_cmd(SMTPD_STATE *state, int argc, SMTPD_TOKEN *unused_argv)
{
/*
* XXX 2821 incompatibility: Section 4.1.1.9 says that NOOP can have a
* parameter string which is to be ignored. NOOP instructions with
* parameters? Go figure.
*
* RFC 2821 violates RFC 821, which says that NOOP takes no parameters.
*/
#ifdef RFC821_SYNTAX
/*
* Sanity checks.
*/
if (argc != 1) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "501 Syntax: NOOP");
return (-1);
}
#endif
smtpd_chat_reply(state, "250 Ok");
return (0);
}
/* vrfy_cmd - process VRFY */
static int vrfy_cmd(SMTPD_STATE *state, int argc, SMTPD_TOKEN *argv)
{
char *err = 0;
/*
* The SMTP standard (RFC 821) disallows unquoted special characters in
* the VRFY argument. Common practice violates the standard, however.
* Postfix accomodates common practice where it violates the standard.
*
* XXX Impedance mismatch! The SMTP command tokenizer preserves quoting,
* whereas the recipient restrictions checks expect unquoted (internal)
* address forms. Therefore we must parse out the address, or we must
* stop doing recipient restriction checks and lose the opportunity to
* say "user unknown" at the SMTP port.
*
* XXX 2821 incompatibility and brain damage: Section 4.5.1 requires that
* VRFY is implemented. RFC 821 specifies that VRFY is optional. It gets
* even worse: section 3.5.3 says that a 502 (command recognized but not
* implemented) reply is not fully compliant.
*
* Thus, an RFC 2821 compliant implementation cannot refuse to supply
* information in reply to VRFY queries. That is simply bogus. The only
* reply we could supply is a generic 252 reply. This causes spammers to
* add tons of bogus addresses to their mailing lists (spam harvesting by
* trying out large lists of potential recipient names with VRFY).
*/
#define SLOPPY 0
if (var_disable_vrfy_cmd) {
state->error_mask |= MAIL_ERROR_POLICY;
smtpd_chat_reply(state, "502 VRFY command is disabled");
return (-1);
}
if (argc < 2) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "501 Syntax: VRFY address");
return (-1);
}
if (argc > 2)
collapse_args(argc - 1, argv + 1);
if ((err = extract_addr(state, argv + 1, REJECT_EMPTY_ADDR, SLOPPY)) != 0) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "%s", err);
return (-1);
}
if (SMTPD_STAND_ALONE(state) == 0
&& (err = smtpd_check_rcpt(state, argv[1].strval)) != 0) {
smtpd_chat_reply(state, "%s", err);
return (-1);
}
/*
* XXX 2821 new feature: Section 3.5.1 requires that the VRFY response is
* either "full name <user@domain>" or "user@domain". Postfix replies
* with the address that was provided by the client, whether or not it is
* in fully qualified domain form or not.
*
* Reply code 250 is reserved for the case where the address is verified;
* reply code 252 should be used when no definitive certainty exists.
*/
smtpd_chat_reply(state, "252 %s", argv[1].strval);
return (0);
}
/* etrn_cmd - process ETRN command */
static int etrn_cmd(SMTPD_STATE *state, int argc, SMTPD_TOKEN *argv)
{
char *err;
/*
* Sanity checks.
*/
if (var_helo_required && state->helo_name == 0) {
state->error_mask |= MAIL_ERROR_POLICY;
smtpd_chat_reply(state, "503 Error: send HELO/EHLO first");
return (-1);
}
if (IN_MAIL_TRANSACTION(state)) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "503 Error: MAIL transaction in progress");
return (-1);
}
if (argc != 2) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "500 Syntax: ETRN domain");
return (-1);
}
if (!ISALNUM(argv[1].strval[0]))
argv[1].strval++;
if (!valid_hostname(argv[1].strval, DONT_GRIPE)) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "501 Error: invalid parameter syntax");
return (-1);
}
/*
* XXX The implementation borrows heavily from the code that implements
* UCE restrictions. These typically return 450 or 550 when a request is
* rejected. RFC 1985 requires that 459 be sent when the server refuses
* to perform the request.
*/
if (SMTPD_STAND_ALONE(state)) {
msg_warn("do not use ETRN in \"sendmail -bs\" mode");
smtpd_chat_reply(state, "458 Unable to queue messages");
return (-1);
}
if ((err = smtpd_check_etrn(state, argv[1].strval)) != 0) {
smtpd_chat_reply(state, "%s", err);
return (-1);
}
switch (flush_send(argv[1].strval)) {
case FLUSH_STAT_OK:
smtpd_chat_reply(state, "250 Queuing started");
return (0);
case FLUSH_STAT_DENY:
msg_warn("reject: ETRN %.100s... from %s",
argv[1].strval, state->namaddr);
smtpd_chat_reply(state, "459 <%s>: service unavailable",
argv[1].strval);
return (-1);
case FLUSH_STAT_BAD:
msg_warn("bad ETRN %.100s... from %s", argv[1].strval, state->namaddr);
smtpd_chat_reply(state, "458 Unable to queue messages");
return (-1);
default:
msg_warn("unable to talk to fast flush service");
smtpd_chat_reply(state, "458 Unable to queue messages");
return (-1);
}
}
/* quit_cmd - process QUIT command */
static int quit_cmd(SMTPD_STATE *state, int unused_argc, SMTPD_TOKEN *unused_argv)
{
/*
* Don't bother checking the syntax.
*/
smtpd_chat_reply(state, "221 Bye");
/*
* When the "." and quit replies are pipelined, make sure they are
* flushed now, to avoid repeated mail deliveries in case of a crash in
* the "clean up before disconnect" code.
*/
vstream_fflush(state->client);
return (0);
}
/* xclient_cmd - override SMTP client attributes */
static int xclient_cmd(SMTPD_STATE *state, int argc, SMTPD_TOKEN *argv)
{
SMTPD_TOKEN *argp;
char *attr_value;
char *attr_name;
int update_namaddr = 0;
int peer_code;
static NAME_CODE peer_codes[] = {
XCLIENT_UNAVAILABLE, SMTPD_PEER_CODE_PERM,
XCLIENT_TEMPORARY, SMTPD_PEER_CODE_TEMP,
0, SMTPD_PEER_CODE_OK,
};
static NAME_CODE proto_names[] = {
MAIL_PROTO_SMTP, 1,
MAIL_PROTO_ESMTP, 2,
0, -1,
};
/*
* Sanity checks. The XCLIENT command does not override its own access
* control.
*/
if (IN_MAIL_TRANSACTION(state)) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "503 Error: MAIL transaction in progress");
return (-1);
}
if (argc < 2) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "501 Syntax: %s attribute=value...",
XCLIENT_CMD);
return (-1);
}
if (!xclient_allowed) {
state->error_mask |= MAIL_ERROR_POLICY;
smtpd_chat_reply(state, "554 Error: insufficient authorization");
return (-1);
}
#define STREQ(x,y) (strcasecmp((x), (y)) == 0)
#define UPDATE_STR(s, v) do { \
if (s) myfree(s); \
s = (v) ? mystrdup(v) : 0; \
} while(0)
/*
* Iterate over all attribute=value elements.
*/
for (argp = argv + 1; argp < argv + argc; argp++) {
attr_name = argp->strval;
/*
* For safety's sake mask non-printable characters. We'll do more
* specific censoring later.
*/
if ((attr_value = split_at(attr_name, '=')) == 0 || *attr_value == 0) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "501 Error: attribute=value expected");
return (-1);
}
printable(attr_value, '?');
/*
* NAME=substitute SMTP client hostname. Also updates the client
* hostname lookup status code.
*/
if (STREQ(attr_name, XCLIENT_NAME)) {
peer_code = name_code(peer_codes, NAME_CODE_FLAG_NONE, attr_value);
if (peer_code != SMTPD_PEER_CODE_OK) {
attr_value = CLIENT_NAME_UNKNOWN;
} else {
if (!valid_hostname(attr_value, DONT_GRIPE)
|| valid_hostaddr(attr_value, DONT_GRIPE)) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "501 Bad %s syntax: %s",
XCLIENT_NAME, attr_value);
return (-1);
}
}
state->peer_code = peer_code;
UPDATE_STR(state->name, attr_value);
update_namaddr = 1;
}
/*
* ADDR=substitute SMTP client network address.
*/
else if (STREQ(attr_name, XCLIENT_ADDR)) {
if (STREQ(attr_value, XCLIENT_UNAVAILABLE)) {
attr_value = CLIENT_ADDR_UNKNOWN;
} else {
if (!valid_hostaddr(attr_value, DONT_GRIPE)) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "501 Bad %s syntax: %s",
XCLIENT_ADDR, attr_value);
return (-1);
}
}
UPDATE_STR(state->addr, attr_value);
update_namaddr = 1;
}
/*
* HELO=substitute SMTP client HELO parameter. Censor special
* characters that could mess up message headers.
*/
else if (STREQ(attr_name, XCLIENT_HELO)) {
if (STREQ(attr_value, XCLIENT_UNAVAILABLE)) {
attr_value = CLIENT_HELO_UNKNOWN;
} else {
if (strlen(attr_value) > VALID_HOSTNAME_LEN) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "501 Bad %s syntax: %s",
XCLIENT_HELO, attr_value);
return (-1);
}
neuter(attr_value, NEUTER_CHARACTERS, '?');
}
UPDATE_STR(state->helo_name, attr_value);
}
/*
* PROTO=SMTP protocol name.
*/
else if (STREQ(attr_name, XCLIENT_PROTO)) {
if (name_code(proto_names, NAME_CODE_FLAG_NONE, attr_value) < 0) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "501 Bad %s syntax: %s",
XCLIENT_PROTO, attr_value);
return (-1);
}
UPDATE_STR(state->protocol, uppercase(attr_value));
}
/*
* Unknown attribute name. Complain.
*/
else {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "501 Bad %s attribute name: %s",
XCLIENT_CMD, attr_name);
return (-1);
}
}
/*
* Update the combined name and address when either has changed.
*/
if (update_namaddr) {
if (state->namaddr)
myfree(state->namaddr);
state->namaddr =
concatenate(state->name, "[", state->addr, "]", (char *) 0);
}
smtpd_chat_reply(state, "250 Ok");
return (0);
}
/* xforward_cmd - forward logging attributes */
static int xforward_cmd(SMTPD_STATE *state, int argc, SMTPD_TOKEN *argv)
{
SMTPD_TOKEN *argp;
char *attr_value;
char *attr_name;
int updated = 0;
static NAME_CODE xforward_flags[] = {
XFORWARD_NAME, SMTPD_STATE_XFORWARD_NAME,
XFORWARD_ADDR, SMTPD_STATE_XFORWARD_ADDR,
XFORWARD_PROTO, SMTPD_STATE_XFORWARD_PROTO,
XFORWARD_HELO, SMTPD_STATE_XFORWARD_HELO,
0, 0,
};
int flag;
/*
* Sanity checks.
*/
if (IN_MAIL_TRANSACTION(state)) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "503 Error: MAIL transaction in progress");
return (-1);
}
if (argc < 2) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "501 Syntax: %s attribute=value...",
XFORWARD_CMD);
return (-1);
}
if (!xforward_allowed) {
state->error_mask |= MAIL_ERROR_POLICY;
smtpd_chat_reply(state, "554 Error: insufficient authorization");
return (-1);
}
/*
* Initialize.
*/
if (state->xforward.flags == 0)
smtpd_xforward_preset(state);
/*
* Iterate over all attribute=value elements.
*/
for (argp = argv + 1; argp < argv + argc; argp++) {
attr_name = argp->strval;
/*
* For safety's sake mask non-printable characters. We'll do more
* specific censoring later.
*/
if ((attr_value = split_at(attr_name, '=')) == 0 || *attr_value == 0) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "501 Error: attribute=value expected");
return (-1);
}
if (strlen(attr_value) > 255) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "501 Error: attribute value too long");
return (-1);
}
printable(attr_value, '?');
flag = name_code(xforward_flags, NAME_CODE_FLAG_NONE, attr_name);
switch (flag) {
/*
* NAME=up-stream host name, not necessarily in the DNS. Censor
* special characters that could mess up message headers.
*/
case SMTPD_STATE_XFORWARD_NAME:
if (STREQ(attr_value, XFORWARD_UNAVAILABLE)) {
attr_value = CLIENT_NAME_UNKNOWN;
} else {
neuter(attr_value, NEUTER_CHARACTERS, '?');
}
UPDATE_STR(state->xforward.name, attr_value);
break;
/*
* ADDR=up-stream host network address, not necessarily on the
* Internet. Censor special characters that could mess up message
* headers.
*/
case SMTPD_STATE_XFORWARD_ADDR:
if (STREQ(attr_value, XFORWARD_UNAVAILABLE)) {
attr_value = CLIENT_ADDR_UNKNOWN;
} else {
neuter(attr_value, NEUTER_CHARACTERS, '?');
}
UPDATE_STR(state->xforward.addr, attr_value);
break;
/*
* HELO=hostname that the up-stream MTA introduced itself with
* (not necessarily SMTP HELO). Censor special characters that
* could mess up message headers.
*/
case SMTPD_STATE_XFORWARD_HELO:
if (STREQ(attr_value, XFORWARD_UNAVAILABLE)) {
attr_value = CLIENT_HELO_UNKNOWN;
} else {
neuter(attr_value, NEUTER_CHARACTERS, '?');
}
UPDATE_STR(state->xforward.helo_name, attr_value);
break;
/*
* PROTO=up-stream protocol, not necessarily SMTP or ESMTP.
* Censor special characters that could mess up message headers.
*/
case SMTPD_STATE_XFORWARD_PROTO:
if (STREQ(attr_value, XFORWARD_UNAVAILABLE)) {
attr_value = CLIENT_PROTO_UNKNOWN;
} else {
if (strlen(attr_value) > 64) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "501 Bad %s syntax: %s",
XFORWARD_PROTO, attr_value);
return (-1);
}
neuter(attr_value, NEUTER_CHARACTERS, '?');
}
UPDATE_STR(state->xforward.protocol, attr_value);
break;
/*
* Unknown attribute name. Complain.
*/
default:
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "501 Bad %s attribute name: %s",
XFORWARD_CMD, attr_name);
return (-1);
}
updated |= flag;
}
state->xforward.flags |= updated;
/*
* Update the combined name and address when either has changed. Use only
* the name when no address is available.
*/
if (updated & (SMTPD_STATE_XFORWARD_NAME | SMTPD_STATE_XFORWARD_ADDR)) {
if (state->xforward.namaddr)
myfree(state->xforward.namaddr);
state->xforward.namaddr =
IS_AVAIL_CLIENT_ADDR(state->xforward.addr) ?
concatenate(state->xforward.name, "[",
state->xforward.addr, "]",
(char *) 0) : mystrdup(state->xforward.name);
}
smtpd_chat_reply(state, "250 Ok");
return (0);
}
/* chat_reset - notify postmaster and reset conversation log */
static void chat_reset(SMTPD_STATE *state, int threshold)
{
/*
* Notify the postmaster if there were errors. This usually indicates a
* client configuration problem, or that someone is trying nasty things.
* Either is significant enough to bother the postmaster. XXX Can't
* report problems when running in stand-alone mode: postmaster notices
* require availability of the cleanup service.
*/
if (state->history != 0 && state->history->argc > threshold) {
if (SMTPD_STAND_ALONE(state) == 0
&& (state->error_mask & state->notify_mask))
smtpd_chat_notify(state);
state->error_mask = 0;
smtpd_chat_reset(state);
}
}
/*
* The table of all SMTP commands that we know. Set the junk limit flag on
* any command that can be repeated an arbitrary number of times without
* triggering a tarpit delay of some sort.
*/
typedef struct SMTPD_CMD {
char *name;
int (*action) (SMTPD_STATE *, int, SMTPD_TOKEN *);
int flags;
} SMTPD_CMD;
#define SMTPD_CMD_FLAG_LIMIT (1<<0) /* limit usage */
#define SMTPD_CMD_FLAG_FORBID (1<<1) /* RFC 2822 mail header */
static SMTPD_CMD smtpd_cmd_table[] = {
"HELO", helo_cmd, SMTPD_CMD_FLAG_LIMIT,
"EHLO", ehlo_cmd, SMTPD_CMD_FLAG_LIMIT,
#ifdef USE_SASL_AUTH
"AUTH", smtpd_sasl_auth_cmd, 0,
#endif
"MAIL", mail_cmd, 0,
"RCPT", rcpt_cmd, 0,
"DATA", data_cmd, 0,
"RSET", rset_cmd, SMTPD_CMD_FLAG_LIMIT,
"NOOP", noop_cmd, SMTPD_CMD_FLAG_LIMIT,
"VRFY", vrfy_cmd, SMTPD_CMD_FLAG_LIMIT,
"ETRN", etrn_cmd, SMTPD_CMD_FLAG_LIMIT,
"QUIT", quit_cmd, 0,
"XCLIENT", xclient_cmd, SMTPD_CMD_FLAG_LIMIT,
"XFORWARD", xforward_cmd, SMTPD_CMD_FLAG_LIMIT,
"Received:", 0, SMTPD_CMD_FLAG_FORBID,
"Reply-To:", 0, SMTPD_CMD_FLAG_FORBID,
"Message-ID:", 0, SMTPD_CMD_FLAG_FORBID,
"Subject:", 0, SMTPD_CMD_FLAG_FORBID,
"From:", 0, SMTPD_CMD_FLAG_FORBID,
"CONNECT", 0, SMTPD_CMD_FLAG_FORBID,
"User-Agent:", 0, SMTPD_CMD_FLAG_FORBID,
0,
};
static STRING_LIST *smtpd_noop_cmds;
/* smtpd_proto - talk the SMTP protocol */
static void smtpd_proto(SMTPD_STATE *state, const char *service)
{
int argc;
SMTPD_TOKEN *argv;
SMTPD_CMD *cmdp;
int count;
int crate;
/*
* Print a greeting banner and run the state machine. Read SMTP commands
* one line at a time. According to the standard, a sender or recipient
* address could contain an escaped newline. I think this is perverse,
* and anyone depending on this is really asking for trouble.
*
* In case of mail protocol trouble, the program jumps back to this place,
* so that it can perform the necessary cleanup before talking to the
* next client. The setjmp/longjmp primitives are like a sharp tool: use
* with care. I would certainly recommend against the use of
* setjmp/longjmp in programs that change privilege levels.
*
* In case of file system trouble the program terminates after logging the
* error and after informing the client. In all other cases (out of
* memory, panic) the error is logged, and the msg_cleanup() exit handler
* cleans up, but no attempt is made to inform the client of the nature
* of the problem.
*/
smtp_timeout_setup(state->client, var_smtpd_tmout);
switch (vstream_setjmp(state->client)) {
default:
msg_panic("smtpd_proto: unknown error reading from %s[%s]",
state->name, state->addr);
break;
case SMTP_ERR_TIME:
state->reason = "timeout";
if (vstream_setjmp(state->client) == 0)
smtpd_chat_reply(state, "421 %s Error: timeout exceeded",
var_myhostname);
break;
case SMTP_ERR_EOF:
state->reason = "lost connection";
break;
case 0:
/*
* XXX The client connection count/rate control must be consistent in
* its use of client address information in connect and disconnect
* events. For now we exclude xclient authorized hosts from
* connection count/rate control.
*/
#ifdef SNAPSHOT
if (SMTPD_STAND_ALONE(state) == 0
&& !xclient_allowed
&& anvil_clnt
&& !namadr_list_match(hogger_list, state->name, state->addr)
&& anvil_clnt_connect(anvil_clnt, service, state->addr,
&count, &crate) == ANVIL_STAT_OK) {
if (var_smtpd_cconn_limit > 0 && count > var_smtpd_cconn_limit) {
smtpd_chat_reply(state, "421 %s Error: too many connections from %s",
var_myhostname, state->addr);
msg_warn("Too many connections: %d from %s for service %s",
count, state->namaddr, service);
break;
}
if (var_smtpd_crate_limit > 0 && crate > var_smtpd_crate_limit) {
smtpd_chat_reply(state, "421 %s Error: too many connections from %s",
var_myhostname, state->addr);
msg_warn("Too frequent connections: %d from %s for service %s",
crate, state->namaddr, service);
break;
}
}
#endif
/* XXX We use the real client for connect access control. */
if (SMTPD_STAND_ALONE(state) == 0
&& var_smtpd_delay_reject == 0
&& (state->access_denied = smtpd_check_client(state)) != 0) {
smtpd_chat_reply(state, "%s", state->access_denied);
state->error_count++;
} else {
smtpd_chat_reply(state, "220 %s", var_smtpd_banner);
}
for (;;) {
if (state->error_count >= var_smtpd_hard_erlim) {
state->reason = "too many errors";
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "421 %s Error: too many errors",
var_myhostname);
break;
}
watchdog_pat();
smtpd_chat_query(state);
if ((argc = smtpd_token(vstring_str(state->buffer), &argv)) == 0) {
state->error_mask |= MAIL_ERROR_PROTOCOL;
smtpd_chat_reply(state, "500 Error: bad syntax");
state->error_count++;
continue;
}
if (*var_smtpd_noop_cmds
&& string_list_match(smtpd_noop_cmds, argv[0].strval)) {
smtpd_chat_reply(state, "250 Ok");
if (state->junk_cmds++ > var_smtpd_junk_cmd_limit)
state->error_count++;
continue;
}
for (cmdp = smtpd_cmd_table; cmdp->name != 0; cmdp++)
if (strcasecmp(argv[0].strval, cmdp->name) == 0)
break;
if (cmdp->name == 0) {
smtpd_chat_reply(state, "502 Error: command not implemented");
state->error_mask |= MAIL_ERROR_PROTOCOL;
state->error_count++;
continue;
}
if (cmdp->flags & SMTPD_CMD_FLAG_FORBID) {
msg_warn("%s sent non-SMTP command: %.100s",
state->namaddr, vstring_str(state->buffer));
smtpd_chat_reply(state, "221 Error: I can break rules, too. Goodbye.");
break;
}
/* XXX We use the real client for connect access control. */
if (state->access_denied && cmdp->action != quit_cmd) {
smtpd_chat_reply(state, "503 Error: access denied for %s",
state->namaddr); /* RFC 2821 Sec 3.1 */
state->error_count++;
continue;
}
state->where = cmdp->name;
if (cmdp->action(state, argc, argv) != 0)
state->error_count++;
if ((cmdp->flags & SMTPD_CMD_FLAG_LIMIT)
&& state->junk_cmds++ > var_smtpd_junk_cmd_limit)
state->error_count++;
if (cmdp->action == quit_cmd)
break;
}
break;
}
/*
* XXX The client connection count/rate control must be consistent in its
* use of client address information in connect and disconnect events.
* For now we exclude xclient authorized hosts from connection count/rate
* control.
*/
#ifdef SNAPSHOT
if (SMTPD_STAND_ALONE(state) == 0
&& !xclient_allowed
&& anvil_clnt
&& !namadr_list_match(hogger_list, state->name, state->addr))
anvil_clnt_disconnect(anvil_clnt, service, state->addr);
#endif
/*
* Log abnormal session termination, in case postmaster notification has
* been turned off. In the log, indicate the last recognized state before
* things went wrong. Don't complain about clients that go away without
* sending QUIT.
*/
if (state->reason && state->where
&& (strcmp(state->where, SMTPD_AFTER_DOT)
|| strcmp(state->reason, "lost connection")))
msg_info("%s after %s from %s[%s]",
state->reason, state->where, state->name, state->addr);
/*
* Cleanup whatever information the client gave us during the SMTP
* dialog.
*/
helo_reset(state);
#ifdef USE_SASL_AUTH
if (var_smtpd_sasl_enable)
smtpd_sasl_auth_reset(state);
#endif
chat_reset(state, 0);
mail_reset(state);
rcpt_reset(state);
}
/* smtpd_service - service one client */
static void smtpd_service(VSTREAM *stream, char *service, char **argv)
{
SMTPD_STATE state;
/*
* Sanity check. This service takes no command-line arguments.
*/
if (argv[0])
msg_fatal("unexpected command-line argument: %s", argv[0]);
/*
* This routine runs when a client has connected to our network port, or
* when the smtp server is run in stand-alone mode (input from pipe).
*
* Look up and sanitize the peer name, then initialize some connection-
* specific state. When the name service is hosed, hostname lookup will
* take a while. This is why I always run a local name server on critical
* machines.
*/
smtpd_state_init(&state, stream);
msg_info("connect from %s[%s]", state.name, state.addr);
/*
* XCLIENT must not override its own access control.
*/
xclient_allowed =
namadr_list_match(xclient_hosts, state.name, state.addr);
/*
* Overriding XFORWARD access control makes no sense, either.
*/
xforward_allowed =
namadr_list_match(xforward_hosts, state.name, state.addr);
/*
* See if we need to turn on verbose logging for this client.
*/
debug_peer_check(state.name, state.addr);
/*
* Provide the SMTP service.
*/
smtpd_proto(&state, service);
/*
* After the client has gone away, clean up whatever we have set up at
* connection time.
*/
msg_info("disconnect from %s[%s]", state.name, state.addr);
smtpd_state_reset(&state);
debug_peer_restore();
}
/* pre_accept - see if tables have changed */
static void pre_accept(char *unused_name, char **unused_argv)
{
const char *table;
if ((table = dict_changed_name()) != 0) {
msg_info("table %s has changed -- restarting", table);
exit(0);
}
}
/* pre_jail_init - pre-jail initialization */
static void pre_jail_init(char *unused_name, char **unused_argv)
{
/*
* Initialize blacklist/etc. patterns before entering the chroot jail, in
* case they specify a filename pattern.
*/
smtpd_noop_cmds = string_list_init(MATCH_FLAG_NONE, var_smtpd_noop_cmds);
verp_clients = namadr_list_init(MATCH_FLAG_NONE, var_verp_clients);
xclient_hosts = namadr_list_init(MATCH_FLAG_NONE, var_xclient_hosts);
xforward_hosts = namadr_list_init(MATCH_FLAG_NONE, var_xforward_hosts);
#ifdef SNAPSHOT
hogger_list = namadr_list_init(MATCH_FLAG_NONE, var_smtpd_hoggers);
#endif
if (getuid() == 0 || getuid() == var_owner_uid)
smtpd_check_init();
debug_peer_init();
if (var_smtpd_sasl_enable)
#ifdef USE_SASL_AUTH
smtpd_sasl_initialize();
if (*var_smtpd_sasl_exceptions_networks)
sasl_exceptions_networks =
namadr_list_init(MATCH_FLAG_NONE,
var_smtpd_sasl_exceptions_networks);
#else
msg_warn("%s is true, but SASL support is not compiled in",
VAR_SMTPD_SASL_ENABLE);
#endif
/*
* flush client.
*/
flush_init();
}
/* post_jail_init - post-jail initialization */
static void post_jail_init(char *unused_name, char **unused_argv)
{
/*
* Initialize the receive transparency options: do we want unknown
* recipient checks, address mapping, header_body_checks?.
*/
smtpd_input_transp_mask =
input_transp_mask(VAR_INPUT_TRANSP, var_input_transp);
/*
* Sanity checks. The queue_minfree value should be at least as large as
* (process_limit * message_size_limit) but that is unpractical, so we
* arbitrarily pick a number and require twice the message size limit.
*/
if (var_queue_minfree > 0
&& var_message_limit > 0
&& var_queue_minfree / 1.5 < var_message_limit)
msg_warn("%s(%lu) should be at least 1.5*%s(%lu)",
VAR_QUEUE_MINFREE, (unsigned long) var_queue_minfree,
VAR_MESSAGE_LIMIT, (unsigned long) var_message_limit);
/*
* Connection rate management.
*/
#ifdef SNAPSHOT
if (var_smtpd_crate_limit || var_smtpd_cconn_limit)
anvil_clnt = anvil_clnt_create();
#endif
}
/* main - the main program */
int main(int argc, char **argv)
{
static CONFIG_INT_TABLE int_table[] = {
VAR_SMTPD_RCPT_LIMIT, DEF_SMTPD_RCPT_LIMIT, &var_smtpd_rcpt_limit, 1, 0,
VAR_SMTPD_SOFT_ERLIM, DEF_SMTPD_SOFT_ERLIM, &var_smtpd_soft_erlim, 1, 0,
VAR_SMTPD_HARD_ERLIM, DEF_SMTPD_HARD_ERLIM, &var_smtpd_hard_erlim, 1, 0,
VAR_QUEUE_MINFREE, DEF_QUEUE_MINFREE, &var_queue_minfree, 0, 0,
VAR_UNK_CLIENT_CODE, DEF_UNK_CLIENT_CODE, &var_unk_client_code, 0, 0,
VAR_BAD_NAME_CODE, DEF_BAD_NAME_CODE, &var_bad_name_code, 0, 0,
VAR_UNK_NAME_CODE, DEF_UNK_NAME_CODE, &var_unk_name_code, 0, 0,
VAR_UNK_ADDR_CODE, DEF_UNK_ADDR_CODE, &var_unk_addr_code, 0, 0,
VAR_RELAY_CODE, DEF_RELAY_CODE, &var_relay_code, 0, 0,
VAR_MAPS_RBL_CODE, DEF_MAPS_RBL_CODE, &var_maps_rbl_code, 0, 0,
VAR_ACCESS_MAP_CODE, DEF_ACCESS_MAP_CODE, &var_access_map_code, 0, 0,
VAR_REJECT_CODE, DEF_REJECT_CODE, &var_reject_code, 0, 0,
VAR_DEFER_CODE, DEF_DEFER_CODE, &var_defer_code, 0, 0,
VAR_NON_FQDN_CODE, DEF_NON_FQDN_CODE, &var_non_fqdn_code, 0, 0,
VAR_SMTPD_JUNK_CMD, DEF_SMTPD_JUNK_CMD, &var_smtpd_junk_cmd_limit, 1, 0,
VAR_SMTPD_RCPT_OVERLIM, DEF_SMTPD_RCPT_OVERLIM, &var_smtpd_rcpt_overlim, 1, 0,
VAR_SMTPD_HIST_THRSH, DEF_SMTPD_HIST_THRSH, &var_smtpd_hist_thrsh, 1, 0,
VAR_UNV_FROM_CODE, DEF_UNV_FROM_CODE, &var_unv_from_code, 0, 0,
VAR_UNV_RCPT_CODE, DEF_UNV_RCPT_CODE, &var_unv_rcpt_code, 0, 0,
VAR_MUL_RCPT_CODE, DEF_MUL_RCPT_CODE, &var_mul_rcpt_code, 0, 0,
VAR_LOCAL_RCPT_CODE, DEF_LOCAL_RCPT_CODE, &var_local_rcpt_code, 0, 0,
VAR_VIRT_ALIAS_CODE, DEF_VIRT_ALIAS_CODE, &var_virt_alias_code, 0, 0,
VAR_VIRT_MAILBOX_CODE, DEF_VIRT_MAILBOX_CODE, &var_virt_mailbox_code, 0, 0,
VAR_RELAY_RCPT_CODE, DEF_RELAY_RCPT_CODE, &var_relay_rcpt_code, 0, 0,
VAR_VERIFY_POLL_COUNT, DEF_VERIFY_POLL_COUNT, &var_verify_poll_count, 1, 0,
#ifdef SNAPSHOT
VAR_SMTPD_CRATE_LIMIT, DEF_SMTPD_CRATE_LIMIT, &var_smtpd_crate_limit, 0, 0,
VAR_SMTPD_CCONN_LIMIT, DEF_SMTPD_CCONN_LIMIT, &var_smtpd_cconn_limit, 0, 0,
#endif
0,
};
static CONFIG_TIME_TABLE time_table[] = {
VAR_SMTPD_TMOUT, DEF_SMTPD_TMOUT, &var_smtpd_tmout, 1, 0,
VAR_SMTPD_ERR_SLEEP, DEF_SMTPD_ERR_SLEEP, &var_smtpd_err_sleep, 0, 0,
VAR_SMTPD_PROXY_TMOUT, DEF_SMTPD_PROXY_TMOUT, &var_smtpd_proxy_tmout, 1, 0,
VAR_VERIFY_POLL_DELAY, DEF_VERIFY_POLL_DELAY, &var_verify_poll_delay, 1, 0,
VAR_SMTPD_POLICY_TMOUT, DEF_SMTPD_POLICY_TMOUT, &var_smtpd_policy_tmout, 1, 0,
VAR_SMTPD_POLICY_IDLE, DEF_SMTPD_POLICY_IDLE, &var_smtpd_policy_idle, 1, 0,
VAR_SMTPD_POLICY_TTL, DEF_SMTPD_POLICY_TTL, &var_smtpd_policy_ttl, 1, 0,
0,
};
static CONFIG_BOOL_TABLE bool_table[] = {
VAR_HELO_REQUIRED, DEF_HELO_REQUIRED, &var_helo_required,
VAR_SMTPD_DELAY_REJECT, DEF_SMTPD_DELAY_REJECT, &var_smtpd_delay_reject,
VAR_STRICT_RFC821_ENV, DEF_STRICT_RFC821_ENV, &var_strict_rfc821_env,
VAR_DISABLE_VRFY_CMD, DEF_DISABLE_VRFY_CMD, &var_disable_vrfy_cmd,
VAR_ALLOW_UNTRUST_ROUTE, DEF_ALLOW_UNTRUST_ROUTE, &var_allow_untrust_route,
VAR_SMTPD_SASL_ENABLE, DEF_SMTPD_SASL_ENABLE, &var_smtpd_sasl_enable,
VAR_BROKEN_AUTH_CLNTS, DEF_BROKEN_AUTH_CLNTS, &var_broken_auth_clients,
VAR_SHOW_UNK_RCPT_TABLE, DEF_SHOW_UNK_RCPT_TABLE, &var_show_unk_rcpt_table,
VAR_SMTPD_REJ_UNL_FROM, DEF_SMTPD_REJ_UNL_FROM, &var_smtpd_rej_unl_from,
VAR_SMTPD_REJ_UNL_RCPT, DEF_SMTPD_REJ_UNL_RCPT, &var_smtpd_rej_unl_rcpt,
0,
};
static CONFIG_STR_TABLE str_table[] = {
VAR_SMTPD_BANNER, DEF_SMTPD_BANNER, &var_smtpd_banner, 1, 0,
VAR_NOTIFY_CLASSES, DEF_NOTIFY_CLASSES, &var_notify_classes, 0, 0,
VAR_CLIENT_CHECKS, DEF_CLIENT_CHECKS, &var_client_checks, 0, 0,
VAR_HELO_CHECKS, DEF_HELO_CHECKS, &var_helo_checks, 0, 0,
VAR_MAIL_CHECKS, DEF_MAIL_CHECKS, &var_mail_checks, 0, 0,
VAR_RCPT_CHECKS, DEF_RCPT_CHECKS, &var_rcpt_checks, 0, 0,
VAR_ETRN_CHECKS, DEF_ETRN_CHECKS, &var_etrn_checks, 0, 0,
VAR_DATA_CHECKS, DEF_DATA_CHECKS, &var_data_checks, 0, 0,
VAR_MAPS_RBL_DOMAINS, DEF_MAPS_RBL_DOMAINS, &var_maps_rbl_domains, 0, 0,
VAR_RBL_REPLY_MAPS, DEF_RBL_REPLY_MAPS, &var_rbl_reply_maps, 0, 0,
VAR_ERROR_RCPT, DEF_ERROR_RCPT, &var_error_rcpt, 1, 0,
VAR_REST_CLASSES, DEF_REST_CLASSES, &var_rest_classes, 0, 0,
VAR_CANONICAL_MAPS, DEF_CANONICAL_MAPS, &var_canonical_maps, 0, 0,
VAR_RCPT_CANON_MAPS, DEF_RCPT_CANON_MAPS, &var_rcpt_canon_maps, 0, 0,
VAR_VIRT_ALIAS_MAPS, DEF_VIRT_ALIAS_MAPS, &var_virt_alias_maps, 0, 0,
VAR_VIRT_MAILBOX_MAPS, DEF_VIRT_MAILBOX_MAPS, &var_virt_mailbox_maps, 0, 0,
VAR_ALIAS_MAPS, DEF_ALIAS_MAPS, &var_alias_maps, 0, 0,
VAR_LOCAL_RCPT_MAPS, DEF_LOCAL_RCPT_MAPS, &var_local_rcpt_maps, 0, 0,
VAR_SMTPD_SASL_OPTS, DEF_SMTPD_SASL_OPTS, &var_smtpd_sasl_opts, 0, 0,
VAR_SMTPD_SASL_APPNAME, DEF_SMTPD_SASL_APPNAME, &var_smtpd_sasl_appname, 1, 0,
VAR_SMTPD_SASL_REALM, DEF_SMTPD_SASL_REALM, &var_smtpd_sasl_realm, 0, 0,
VAR_SMTPD_SASL_EXCEPTIONS_NETWORKS, DEF_SMTPD_SASL_EXCEPTIONS_NETWORKS, &var_smtpd_sasl_exceptions_networks, 0, 0,
VAR_FILTER_XPORT, DEF_FILTER_XPORT, &var_filter_xport, 0, 0,
VAR_PERM_MX_NETWORKS, DEF_PERM_MX_NETWORKS, &var_perm_mx_networks, 0, 0,
VAR_SMTPD_SND_AUTH_MAPS, DEF_SMTPD_SND_AUTH_MAPS, &var_smtpd_snd_auth_maps, 0, 0,
VAR_SMTPD_NOOP_CMDS, DEF_SMTPD_NOOP_CMDS, &var_smtpd_noop_cmds, 0, 0,
VAR_SMTPD_NULL_KEY, DEF_SMTPD_NULL_KEY, &var_smtpd_null_key, 0, 0,
VAR_RELAY_RCPT_MAPS, DEF_RELAY_RCPT_MAPS, &var_relay_rcpt_maps, 0, 0,
VAR_VERIFY_SENDER, DEF_VERIFY_SENDER, &var_verify_sender, 0, 0,
VAR_VERP_CLIENTS, DEF_VERP_CLIENTS, &var_verp_clients, 0, 0,
VAR_SMTPD_PROXY_FILT, DEF_SMTPD_PROXY_FILT, &var_smtpd_proxy_filt, 0, 0,
VAR_SMTPD_PROXY_EHLO, DEF_SMTPD_PROXY_EHLO, &var_smtpd_proxy_ehlo, 0, 0,
VAR_INPUT_TRANSP, DEF_INPUT_TRANSP, &var_input_transp, 0, 0,
VAR_XCLIENT_HOSTS, DEF_XCLIENT_HOSTS, &var_xclient_hosts, 0, 0,
VAR_XFORWARD_HOSTS, DEF_XFORWARD_HOSTS, &var_xforward_hosts, 0, 0,
#ifdef SNAPSHOT
VAR_SMTPD_HOGGERS, DEF_SMTPD_HOGGERS, &var_smtpd_hoggers, 0, 0,
#endif
0,
};
static CONFIG_RAW_TABLE raw_table[] = {
VAR_SMTPD_EXP_FILTER, DEF_SMTPD_EXP_FILTER, &var_smtpd_exp_filter, 1, 0,
VAR_DEF_RBL_REPLY, DEF_DEF_RBL_REPLY, &var_def_rbl_reply, 1, 0,
0,
};
/*
* Pass control to the single-threaded service skeleton.
*/
single_server_main(argc, argv, smtpd_service,
MAIL_SERVER_INT_TABLE, int_table,
MAIL_SERVER_STR_TABLE, str_table,
MAIL_SERVER_RAW_TABLE, raw_table,
MAIL_SERVER_BOOL_TABLE, bool_table,
MAIL_SERVER_TIME_TABLE, time_table,
MAIL_SERVER_PRE_INIT, pre_jail_init,
MAIL_SERVER_PRE_ACCEPT, pre_accept,
MAIL_SERVER_POST_INIT, post_jail_init,
0);
}