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+/*++
+/* NAME
+/* local 8
+/* SUMMARY
+/* Postfix local mail delivery
+/* SYNOPSIS
+/* \fBlocal\fR [generic Postfix daemon options]
+/* DESCRIPTION
+/* The \fBlocal\fR(8) daemon processes delivery requests from the
+/* Postfix queue manager to deliver mail to local recipients.
+/* Each delivery request specifies a queue file, a sender address,
+/* a domain or host to deliver to, and one or more recipients.
+/* This program expects to be run from the \fBmaster\fR(8) process
+/* manager.
+/*
+/* The \fBlocal\fR(8) daemon updates queue files 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 \fBbounce\fR(8), \fBdefer\fR(8) or \fBtrace\fR(8) daemon as
+/* appropriate.
+/* CASE FOLDING
+/* .ad
+/* .fi
+/* All delivery decisions are made using the bare recipient
+/* name (i.e. the address localpart), folded to lower case.
+/* See also under ADDRESS EXTENSION below for a few exceptions.
+/* SYSTEM-WIDE AND USER-LEVEL ALIASING
+/* .ad
+/* .fi
+/* The system administrator can set up one or more system-wide
+/* \fBsendmail\fR-style alias databases.
+/* Users can have \fBsendmail\fR-style ~/.\fBforward\fR files.
+/* Mail for \fIname\fR is delivered to the alias \fIname\fR, to
+/* destinations in ~\fIname\fR/.\fBforward\fR, to the mailbox owned
+/* by the user \fIname\fR, or it is sent back as undeliverable.
+/*
+/* The system administrator can specify a comma/space separated list
+/* of ~\fR/.\fBforward\fR like files through the \fBforward_path\fR
+/* configuration parameter. Upon delivery, the local delivery agent
+/* tries each pathname in the list until a file is found.
+/*
+/* Delivery via ~/.\fBforward\fR files is done with the privileges
+/* of the recipient.
+/* Thus, ~/.\fBforward\fR like files must be readable by the
+/* recipient, and their parent directory needs to have "execute"
+/* permission for the recipient.
+/*
+/* The \fBforward_path\fR parameter is subject to interpolation of
+/* \fB$user\fR (recipient username), \fB$home\fR (recipient home
+/* directory), \fB$shell\fR (recipient shell), \fB$recipient\fR
+/* (complete recipient address), \fB$extension\fR (recipient address
+/* extension), \fB$domain\fR (recipient domain), \fB$local\fR
+/* (entire recipient address localpart) and
+/* \fB$recipient_delimiter.\fR The forms \fI${name?value}\fR and
+/* \fI${name:value}\fR expand conditionally to \fIvalue\fR when
+/* \fI$name\fR is (is not) defined.
+/* Characters that may have special meaning to the shell or file system
+/* are replaced by underscores. The list of acceptable characters
+/* is specified with the \fBforward_expansion_filter\fR configuration
+/* parameter.
+/*
+/* An alias or ~/.\fBforward\fR file may list any combination of external
+/* commands, destination file names, \fB:include:\fR directives, or
+/* mail addresses.
+/* See \fBaliases\fR(5) for a precise description. Each line in a
+/* user's .\fBforward\fR file has the same syntax as the right-hand part
+/* of an alias.
+/*
+/* When an address is found in its own alias expansion, delivery is
+/* made to the user instead. When a user is listed in the user's own
+/* ~/.\fBforward\fR file, delivery is made to the user's mailbox instead.
+/* An empty ~/.\fBforward\fR file means do not forward mail.
+/*
+/* In order to prevent the mail system from using up unreasonable
+/* amounts of memory, input records read from \fB:include:\fR or from
+/* ~/.\fBforward\fR files are broken up into chunks of length
+/* \fBline_length_limit\fR.
+/*
+/* While expanding aliases, ~/.\fBforward\fR files, and so on, the
+/* program attempts to avoid duplicate deliveries. The
+/* \fBduplicate_filter_limit\fR configuration parameter limits the
+/* number of remembered recipients.
+/* MAIL FORWARDING
+/* .ad
+/* .fi
+/* For the sake of reliability, forwarded mail is re-submitted as
+/* a new message, so that each recipient has a separate on-file
+/* delivery status record.
+/*
+/* In order to stop mail forwarding loops early, the software adds an
+/* optional
+/* \fBDelivered-To:\fR header with the final envelope recipient address. If
+/* mail arrives for a recipient that is already listed in a
+/* \fBDelivered-To:\fR header, the message is bounced.
+/* MAILBOX DELIVERY
+/* .ad
+/* .fi
+/* The default per-user mailbox is a file in the UNIX mail spool
+/* directory (\fB/var/mail/\fIuser\fR or \fB/var/spool/mail/\fIuser\fR);
+/* the location can be specified with the \fBmail_spool_directory\fR
+/* configuration parameter. Specify a name ending in \fB/\fR for
+/* \fBqmail\fR-compatible \fBmaildir\fR delivery.
+/*
+/* Alternatively, the per-user mailbox can be a file in the user's home
+/* directory with a name specified via the \fBhome_mailbox\fR
+/* configuration parameter. Specify a relative path name. Specify a name
+/* ending in \fB/\fR for \fBqmail\fR-compatible \fBmaildir\fR delivery.
+/*
+/* Mailbox delivery can be delegated to an external command specified
+/* with the \fBmailbox_command_maps\fR and \fBmailbox_command\fR
+/* configuration parameters. The command
+/* executes with the privileges of the recipient user (exceptions:
+/* secondary groups are not enabled; in case of delivery as root,
+/* the command executes with the privileges of \fBdefault_privs\fR).
+/*
+/* Mailbox delivery can be delegated to alternative message transports
+/* specified in the \fBmaster.cf\fR file.
+/* The \fBmailbox_transport_maps\fR and \fBmailbox_transport\fR
+/* configuration parameters specify an optional
+/* message transport that is to be used for all local recipients,
+/* regardless of whether they are found in the UNIX passwd database.
+/* The \fBfallback_transport_maps\fR and
+/* \fBfallback_transport\fR parameters specify an optional
+/* message transport
+/* for recipients that are not found in the aliases(5) or UNIX
+/* passwd database.
+/*
+/* In the case of UNIX-style mailbox delivery,
+/* the \fBlocal\fR(8) daemon prepends a "\fBFrom \fIsender time_stamp\fR"
+/* envelope header to each message, prepends an
+/* \fBX-Original-To:\fR header with the recipient address as given to
+/* Postfix, prepends an
+/* optional \fBDelivered-To:\fR header
+/* with the final envelope recipient address, prepends a \fBReturn-Path:\fR
+/* header with the envelope sender address, prepends a \fB>\fR character
+/* to lines beginning with "\fBFrom \fR", and appends an empty line.
+/* The mailbox is locked for exclusive access while delivery is in
+/* progress. In case of problems, an attempt is made to truncate the
+/* mailbox to its original length.
+/*
+/* In the case of \fBmaildir\fR delivery, the local daemon prepends
+/* an optional
+/* \fBDelivered-To:\fR header with the final envelope recipient address,
+/* prepends an
+/* \fBX-Original-To:\fR header with the recipient address as given to
+/* Postfix,
+/* and prepends a \fBReturn-Path:\fR header with the envelope sender
+/* address.
+/* EXTERNAL COMMAND DELIVERY
+/* .ad
+/* .fi
+/* The \fBallow_mail_to_commands\fR configuration parameter restricts
+/* delivery to external commands. The default setting (\fBalias,
+/* forward\fR) forbids command destinations in \fB:include:\fR files.
+/*
+/* Optionally, the process working directory is changed to the path
+/* specified with \fBcommand_execution_directory\fR (Postfix 2.2 and
+/* later). Failure to change directory causes mail to be deferred.
+/*
+/* The \fBcommand_execution_directory\fR parameter value is subject
+/* to interpolation of \fB$user\fR (recipient username),
+/* \fB$home\fR (recipient home directory), \fB$shell\fR
+/* (recipient shell), \fB$recipient\fR (complete recipient
+/* address), \fB$extension\fR (recipient address extension),
+/* \fB$domain\fR (recipient domain), \fB$local\fR (entire
+/* recipient address localpart) and \fB$recipient_delimiter.\fR
+/* The forms \fI${name?value}\fR and \fI${name:value}\fR expand
+/* conditionally to \fIvalue\fR when \fI$name\fR is (is not)
+/* defined. Characters that may have special meaning to the
+/* shell or file system are replaced by underscores. The list
+/* of acceptable characters is specified with the
+/* \fBexecution_directory_expansion_filter\fR configuration
+/* parameter.
+/*
+/* The command is executed directly where possible. Assistance by the
+/* shell (\fB/bin/sh\fR on UNIX systems) is used only when the command
+/* contains shell magic characters, or when the command invokes a shell
+/* built-in command.
+/*
+/* A limited amount of command output (standard output and standard
+/* error) is captured for inclusion with non-delivery status reports.
+/* A command is forcibly terminated if it does not complete within
+/* \fBcommand_time_limit\fR seconds. Command exit status codes are
+/* expected to follow the conventions defined in <\fBsysexits.h\fR>.
+/* Exit status 0 means normal successful completion.
+/*
+/* Postfix version 2.3 and later support RFC 3463-style enhanced
+/* status codes. If a command terminates with a non-zero exit
+/* status, and the command output begins with an enhanced
+/* status code, this status code takes precedence over the
+/* non-zero exit status.
+/*
+/* A limited amount of message context is exported via environment
+/* variables. Characters that may have special meaning to the shell
+/* are replaced by underscores. The list of acceptable characters
+/* is specified with the \fBcommand_expansion_filter\fR configuration
+/* parameter.
+/* .IP \fBSHELL\fR
+/* The recipient user's login shell.
+/* .IP \fBHOME\fR
+/* The recipient user's home directory.
+/* .IP \fBUSER\fR
+/* The bare recipient name.
+/* .IP \fBEXTENSION\fR
+/* The optional recipient address extension.
+/* .IP \fBDOMAIN\fR
+/* The recipient address domain part.
+/* .IP \fBLOGNAME\fR
+/* The bare recipient name.
+/* .IP \fBLOCAL\fR
+/* The entire recipient address localpart (text to the left of the
+/* rightmost @ character).
+/* .IP \fBORIGINAL_RECIPIENT\fR
+/* The entire recipient address, before any address rewriting
+/* or aliasing (Postfix 2.5 and later).
+/* .IP \fBRECIPIENT\fR
+/* The entire recipient address.
+/* .IP \fBSENDER\fR
+/* The entire sender address.
+/* .PP
+/* Additional remote client information is made available via
+/* the following environment variables:
+/* .IP \fBCLIENT_ADDRESS\fR
+/* Remote client network address. Available as of Postfix 2.2.
+/* .IP \fBCLIENT_HELO\fR
+/* Remote client EHLO command parameter. Available as of Postfix 2.2.
+/* .IP \fBCLIENT_HOSTNAME\fR
+/* Remote client hostname. Available as of Postfix 2.2.
+/* .IP \fBCLIENT_PROTOCOL\fR
+/* Remote client protocol. Available as of Postfix 2.2.
+/* .IP \fBSASL_METHOD\fR
+/* SASL authentication method specified in the
+/* remote client AUTH command. Available as of Postfix 2.2.
+/* .IP \fBSASL_SENDER\fR
+/* SASL sender address specified in the remote client MAIL
+/* FROM command. Available as of Postfix 2.2.
+/* .IP \fBSASL_USERNAME\fR
+/* SASL username specified in the remote client AUTH command.
+/* Available as of Postfix 2.2.
+/* .PP
+/* The \fBPATH\fR environment variable is always reset to a
+/* system-dependent default path, and environment variables
+/* whose names are blessed by the \fBexport_environment\fR
+/* configuration parameter are exported unchanged.
+/*
+/* The current working directory is the mail queue directory.
+/*
+/* The \fBlocal\fR(8) daemon prepends a "\fBFrom \fIsender time_stamp\fR"
+/* envelope header to each message, prepends an
+/* \fBX-Original-To:\fR header with the recipient address as given to
+/* Postfix, prepends an
+/* optional \fBDelivered-To:\fR
+/* header with the final recipient envelope address, prepends a
+/* \fBReturn-Path:\fR header with the sender envelope address,
+/* and appends no empty line.
+/* EXTERNAL FILE DELIVERY
+/* .ad
+/* .fi
+/* The delivery format depends on the destination filename syntax.
+/* The default is to use UNIX-style mailbox format. Specify a name
+/* ending in \fB/\fR for \fBqmail\fR-compatible \fBmaildir\fR delivery.
+/*
+/* The \fBallow_mail_to_files\fR configuration parameter restricts
+/* delivery to external files. The default setting (\fBalias,
+/* forward\fR) forbids file destinations in \fB:include:\fR files.
+/*
+/* In the case of UNIX-style mailbox delivery,
+/* the \fBlocal\fR(8) daemon prepends a "\fBFrom \fIsender time_stamp\fR"
+/* envelope header to each message, prepends an
+/* \fBX-Original-To:\fR header with the recipient address as given to
+/* Postfix, prepends an
+/* optional \fBDelivered-To:\fR
+/* header with the final recipient envelope address, prepends a \fB>\fR
+/* character to lines beginning with "\fBFrom \fR", and appends an
+/* empty line.
+/* The envelope sender address is available in the \fBReturn-Path:\fR
+/* header.
+/* When the destination is a regular file, it is locked for exclusive
+/* access while delivery is in progress. In case of problems, an attempt
+/* is made to truncate a regular file to its original length.
+/*
+/* In the case of \fBmaildir\fR delivery, the local daemon prepends
+/* an optional
+/* \fBDelivered-To:\fR header with the final envelope recipient address,
+/* and prepends an
+/* \fBX-Original-To:\fR header with the recipient address as given to
+/* Postfix.
+/* The envelope sender address is available in the \fBReturn-Path:\fR
+/* header.
+/* ADDRESS EXTENSION
+/* .ad
+/* .fi
+/* The optional \fBrecipient_delimiter\fR configuration parameter
+/* specifies how to separate address extensions from local recipient
+/* names.
+/*
+/* For example, with "\fBrecipient_delimiter = +\fR", mail for
+/* \fIname\fR+\fIfoo\fR is delivered to the alias \fIname\fR+\fIfoo\fR
+/* or to the alias \fIname\fR, to the destinations listed in
+/* ~\fIname\fR/.\fBforward\fR+\fIfoo\fR or in ~\fIname\fR/.\fBforward\fR,
+/* to the mailbox owned by the user \fIname\fR, or it is sent back as
+/* undeliverable.
+/* DELIVERY RIGHTS
+/* .ad
+/* .fi
+/* Deliveries to external files and external commands are made with
+/* the rights of the receiving user on whose behalf the delivery is made.
+/* In the absence of a user context, the \fBlocal\fR(8) daemon uses the
+/* owner rights of the \fB:include:\fR file or alias database.
+/* When those files are owned by the superuser, delivery is made with
+/* the rights specified with the \fBdefault_privs\fR configuration
+/* parameter.
+/* STANDARDS
+/* RFC 822 (ARPA Internet Text Messages)
+/* RFC 3463 (Enhanced status codes)
+/* DIAGNOSTICS
+/* Problems and transactions are logged to \fBsyslogd\fR(8)
+/* or \fBpostlogd\fR(8).
+/* Corrupted message files are marked so that the queue
+/* manager can move them to the \fBcorrupt\fR queue afterwards.
+/*
+/* Depending on the setting of the \fBnotify_classes\fR parameter,
+/* the postmaster is notified of bounces and of other trouble.
+/* SECURITY
+/* .ad
+/* .fi
+/* The \fBlocal\fR(8) delivery agent needs a dual personality
+/* 1) to access the private Postfix queue and IPC mechanisms,
+/* 2) to impersonate the recipient and deliver to recipient-specified
+/* files or commands. It is therefore security sensitive.
+/*
+/* The \fBlocal\fR(8) delivery agent disallows regular expression
+/* substitution of $1 etc. in \fBalias_maps\fR, because that
+/* would open a security hole.
+/*
+/* The \fBlocal\fR(8) delivery agent will silently ignore
+/* requests to use the \fBproxymap\fR(8) server within
+/* \fBalias_maps\fR. Instead it will open the table directly.
+/* Before Postfix version 2.2, the \fBlocal\fR(8) delivery
+/* agent will terminate with a fatal error.
+/* BUGS
+/* For security reasons, the message delivery status of external commands
+/* or of external files is never checkpointed to file. As a result,
+/* the program may occasionally deliver more than once to a command or
+/* external file. Better safe than sorry.
+/*
+/* Mutually-recursive aliases or ~/.\fBforward\fR files are not detected
+/* early. The resulting mail forwarding loop is broken by the use of the
+/* \fBDelivered-To:\fR message header.
+/* CONFIGURATION PARAMETERS
+/* .ad
+/* .fi
+/* Changes to \fBmain.cf\fR are picked up automatically, as \fBlocal\fR(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
+/* \fBpostconf\fR(5) for more details including examples.
+/* COMPATIBILITY CONTROLS
+/* .ad
+/* .fi
+/* .IP "\fBbiff (yes)\fR"
+/* Whether or not to use the local biff service.
+/* .IP "\fBexpand_owner_alias (no)\fR"
+/* When delivering to an alias "\fIaliasname\fR" that has an
+/* "owner-\fIaliasname\fR" companion alias, set the envelope sender
+/* address to the expansion of the "owner-\fIaliasname\fR" alias.
+/* .IP "\fBowner_request_special (yes)\fR"
+/* Enable special treatment for owner-\fIlistname\fR entries in the
+/* \fBaliases\fR(5) file, and don't split owner-\fIlistname\fR and
+/* \fIlistname\fR-request address localparts when the recipient_delimiter
+/* is set to "-".
+/* .IP "\fBsun_mailtool_compatibility (no)\fR"
+/* Obsolete SUN mailtool compatibility feature.
+/* .PP
+/* Available in Postfix version 2.3 and later:
+/* .IP "\fBfrozen_delivered_to (yes)\fR"
+/* Update the \fBlocal\fR(8) delivery agent's idea of the Delivered-To:
+/* address (see prepend_delivered_header) only once, at the start of
+/* a delivery attempt; do not update the Delivered-To: address while
+/* expanding aliases or .forward files.
+/* .PP
+/* Available in Postfix version 2.5.3 and later:
+/* .IP "\fBstrict_mailbox_ownership (yes)\fR"
+/* Defer delivery when a mailbox file is not owned by its recipient.
+/* .IP "\fBreset_owner_alias (no)\fR"
+/* Reset the \fBlocal\fR(8) delivery agent's idea of the owner-alias
+/* attribute, when delivering mail to a child alias that does not have
+/* its own owner alias.
+/* .PP
+/* Available in Postfix version 3.0 and later:
+/* .IP "\fBlocal_delivery_status_filter ($default_delivery_status_filter)\fR"
+/* Optional filter for the \fBlocal\fR(8) delivery agent to change the
+/* status code or explanatory text of successful or unsuccessful
+/* deliveries.
+/* DELIVERY METHOD CONTROLS
+/* .ad
+/* .fi
+/* The precedence of \fBlocal\fR(8) delivery methods from high to low is:
+/* aliases, .forward files, mailbox_transport_maps,
+/* mailbox_transport, mailbox_command_maps, mailbox_command,
+/* home_mailbox, mail_spool_directory, fallback_transport_maps,
+/* fallback_transport, and luser_relay.
+/* .IP "\fBalias_maps (see 'postconf -d' output)\fR"
+/* The alias databases that are used for \fBlocal\fR(8) delivery.
+/* .IP "\fBforward_path (see 'postconf -d' output)\fR"
+/* The \fBlocal\fR(8) delivery agent search list for finding a .forward
+/* file with user-specified delivery methods.
+/* .IP "\fBmailbox_transport_maps (empty)\fR"
+/* Optional lookup tables with per-recipient message delivery
+/* transports to use for \fBlocal\fR(8) mailbox delivery, whether or not the
+/* recipients are found in the UNIX passwd database.
+/* .IP "\fBmailbox_transport (empty)\fR"
+/* Optional message delivery transport that the \fBlocal\fR(8) delivery
+/* agent should use for mailbox delivery to all local recipients,
+/* whether or not they are found in the UNIX passwd database.
+/* .IP "\fBmailbox_command_maps (empty)\fR"
+/* Optional lookup tables with per-recipient external commands to use
+/* for \fBlocal\fR(8) mailbox delivery.
+/* .IP "\fBmailbox_command (empty)\fR"
+/* Optional external command that the \fBlocal\fR(8) delivery agent should
+/* use for mailbox delivery.
+/* .IP "\fBhome_mailbox (empty)\fR"
+/* Optional pathname of a mailbox file relative to a \fBlocal\fR(8) user's
+/* home directory.
+/* .IP "\fBmail_spool_directory (see 'postconf -d' output)\fR"
+/* The directory where \fBlocal\fR(8) UNIX-style mailboxes are kept.
+/* .IP "\fBfallback_transport_maps (empty)\fR"
+/* Optional lookup tables with per-recipient message delivery
+/* transports for recipients that the \fBlocal\fR(8) delivery agent could
+/* not find in the \fBaliases\fR(5) or UNIX password database.
+/* .IP "\fBfallback_transport (empty)\fR"
+/* Optional message delivery transport that the \fBlocal\fR(8) delivery
+/* agent should use for names that are not found in the \fBaliases\fR(5)
+/* or UNIX password database.
+/* .IP "\fBluser_relay (empty)\fR"
+/* Optional catch-all destination for unknown \fBlocal\fR(8) recipients.
+/* .PP
+/* Available in Postfix version 2.2 and later:
+/* .IP "\fBcommand_execution_directory (empty)\fR"
+/* The \fBlocal\fR(8) delivery agent working directory for delivery to
+/* external command.
+/* MAILBOX LOCKING CONTROLS
+/* .ad
+/* .fi
+/* .IP "\fBdeliver_lock_attempts (20)\fR"
+/* The maximal number of attempts to acquire an exclusive lock on a
+/* mailbox file or \fBbounce\fR(8) logfile.
+/* .IP "\fBdeliver_lock_delay (1s)\fR"
+/* The time between attempts to acquire an exclusive lock on a mailbox
+/* file or \fBbounce\fR(8) logfile.
+/* .IP "\fBstale_lock_time (500s)\fR"
+/* The time after which a stale exclusive mailbox lockfile is removed.
+/* .IP "\fBmailbox_delivery_lock (see 'postconf -d' output)\fR"
+/* How to lock a UNIX-style \fBlocal\fR(8) mailbox before attempting delivery.
+/* RESOURCE AND RATE CONTROLS
+/* .ad
+/* .fi
+/* .IP "\fBcommand_time_limit (1000s)\fR"
+/* Time limit for delivery to external commands.
+/* .IP "\fBduplicate_filter_limit (1000)\fR"
+/* The maximal number of addresses remembered by the address
+/* duplicate filter for \fBaliases\fR(5) or \fBvirtual\fR(5) alias expansion, or
+/* for \fBshowq\fR(8) queue displays.
+/* .IP "\fBmailbox_size_limit (51200000)\fR"
+/* The maximal size of any \fBlocal\fR(8) individual mailbox or maildir
+/* file, or zero (no limit).
+/* .PP
+/* Implemented in the qmgr(8) daemon:
+/* .IP "\fBlocal_destination_concurrency_limit (2)\fR"
+/* The maximal number of parallel deliveries via the local mail
+/* delivery transport to the same recipient (when
+/* "local_destination_recipient_limit = 1") or the maximal number of
+/* parallel deliveries to the same local domain (when
+/* "local_destination_recipient_limit > 1").
+/* .IP "\fBlocal_destination_recipient_limit (1)\fR"
+/* The maximal number of recipients per message delivery via the
+/* local mail delivery transport.
+/* SECURITY CONTROLS
+/* .ad
+/* .fi
+/* .IP "\fBallow_mail_to_commands (alias, forward)\fR"
+/* Restrict \fBlocal\fR(8) mail delivery to external commands.
+/* .IP "\fBallow_mail_to_files (alias, forward)\fR"
+/* Restrict \fBlocal\fR(8) mail delivery to external files.
+/* .IP "\fBcommand_expansion_filter (see 'postconf -d' output)\fR"
+/* Restrict the characters that the \fBlocal\fR(8) delivery agent allows in
+/* $name expansions of $mailbox_command and $command_execution_directory.
+/* .IP "\fBdefault_privs (nobody)\fR"
+/* The default rights used by the \fBlocal\fR(8) delivery agent for delivery
+/* to external file or command.
+/* .IP "\fBforward_expansion_filter (see 'postconf -d' output)\fR"
+/* Restrict the characters that the \fBlocal\fR(8) delivery agent allows in
+/* $name expansions of $forward_path.
+/* .PP
+/* Available in Postfix version 2.2 and later:
+/* .IP "\fBexecution_directory_expansion_filter (see 'postconf -d' output)\fR"
+/* Restrict the characters that the \fBlocal\fR(8) delivery agent allows
+/* in $name expansions of $command_execution_directory.
+/* .PP
+/* Available in Postfix version 2.5.3 and later:
+/* .IP "\fBstrict_mailbox_ownership (yes)\fR"
+/* Defer delivery when a mailbox file is not owned by its recipient.
+/* 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 "\fBdelay_logging_resolution_limit (2)\fR"
+/* The maximal number of digits after the decimal point when logging
+/* sub-second delay values.
+/* .IP "\fBexport_environment (see 'postconf -d' output)\fR"
+/* The list of environment variables that a Postfix process will export
+/* to non-Postfix processes.
+/* .IP "\fBipc_timeout (3600s)\fR"
+/* The time limit for sending or receiving information over an internal
+/* communication channel.
+/* .IP "\fBlocal_command_shell (empty)\fR"
+/* Optional shell program for \fBlocal\fR(8) delivery to non-Postfix command.
+/* .IP "\fBmax_idle (100s)\fR"
+/* The maximum amount of time that an idle Postfix daemon process waits
+/* for an incoming connection before terminating voluntarily.
+/* .IP "\fBmax_use (100)\fR"
+/* The maximal number of incoming connections that a Postfix daemon
+/* process will service before terminating voluntarily.
+/* .IP "\fBprepend_delivered_header (command, file, forward)\fR"
+/* The message delivery contexts where the Postfix \fBlocal\fR(8) delivery
+/* agent prepends a Delivered-To: message header with the address
+/* that the mail was 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 "\fBpropagate_unmatched_extensions (canonical, virtual)\fR"
+/* What address lookup tables copy an address extension from the lookup
+/* key to the lookup result.
+/* .IP "\fBqueue_directory (see 'postconf -d' output)\fR"
+/* The location of the Postfix top-level queue directory.
+/* .IP "\fBrecipient_delimiter (empty)\fR"
+/* The set of characters that can separate a user name from its
+/* extension (example: user+foo), or a .forward file name from its
+/* extension (example: .forward+foo).
+/* .IP "\fBrequire_home_directory (no)\fR"
+/* Require that a \fBlocal\fR(8) recipient's home directory exists
+/* before mail delivery is attempted.
+/* .IP "\fBsyslog_facility (mail)\fR"
+/* The syslog facility of Postfix logging.
+/* .IP "\fBsyslog_name (see 'postconf -d' output)\fR"
+/* A prefix that is prepended to the process name in syslog
+/* records, so that, for example, "smtpd" becomes "prefix/smtpd".
+/* .PP
+/* Available in Postfix version 3.3 and later:
+/* .IP "\fBenable_original_recipient (yes)\fR"
+/* Enable support for the original recipient address after an
+/* address is rewritten to a different address (for example with
+/* aliasing or with canonical mapping).
+/* .IP "\fBservice_name (read-only)\fR"
+/* The master.cf service name of a Postfix daemon process.
+/* .PP
+/* Available in Postfix 3.5 and later:
+/* .IP "\fBinfo_log_address_format (external)\fR"
+/* The email address form that will be used in non-debug logging
+/* (info, warning, etc.).
+/* FILES
+/* The following are examples; details differ between systems.
+/* $HOME/.forward, per-user aliasing
+/* /etc/aliases, system-wide alias database
+/* /var/spool/mail, system mailboxes
+/* SEE ALSO
+/* qmgr(8), queue manager
+/* bounce(8), delivery status reports
+/* newaliases(1), create/update alias database
+/* postalias(1), create/update alias database
+/* aliases(5), format of alias database
+/* postconf(5), configuration parameters
+/* master(5), generic daemon options
+/* postlogd(8), Postfix logging
+/* syslogd(8), system logging
+/* LICENSE
+/* .ad
+/* .fi
+/* The Secure Mailer license must be distributed with this software.
+/* HISTORY
+/* .ad
+/* .fi
+/* The \fBDelivered-To:\fR message header appears in the \fBqmail\fR
+/* system by Daniel Bernstein.
+/*
+/* The \fImaildir\fR structure appears in the \fBqmail\fR system
+/* by Daniel Bernstein.
+/* AUTHOR(S)
+/* Wietse Venema
+/* IBM T.J. Watson Research
+/* P.O. Box 704
+/* Yorktown Heights, NY 10598, USA
+/*
+/* Wietse Venema
+/* Google, Inc.
+/* 111 8th Avenue
+/* New York, NY 10011, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#ifdef USE_PATHS_H
+#include <paths.h>
+#endif
+
+/* Utility library. */
+
+#include <msg.h>
+#include <mymalloc.h>
+#include <htable.h>
+#include <vstring.h>
+#include <vstream.h>
+#include <iostuff.h>
+#include <name_mask.h>
+#include <set_eugid.h>
+#include <dict.h>
+
+/* Global library. */
+
+#include <recipient_list.h>
+#include <deliver_request.h>
+#include <deliver_completed.h>
+#include <mail_params.h>
+#include <mail_addr.h>
+#include <mail_conf.h>
+#include <been_here.h>
+#include <mail_params.h>
+#include <mail_version.h>
+#include <ext_prop.h>
+#include <maps.h>
+#include <flush_clnt.h>
+
+/* Single server skeleton. */
+
+#include <mail_server.h>
+
+/* Application-specific. */
+
+#include "local.h"
+
+ /*
+ * Tunable parameters.
+ */
+char *var_allow_commands;
+char *var_allow_files;
+char *var_alias_maps;
+int var_dup_filter_limit;
+int var_command_maxtime; /* You can now leave this here. */
+char *var_home_mailbox;
+char *var_mailbox_command;
+char *var_mailbox_cmd_maps;
+char *var_rcpt_fdelim;
+char *var_local_cmd_shell;
+char *var_luser_relay;
+int var_biff;
+char *var_mail_spool_dir;
+char *var_mailbox_transport;
+char *var_mbox_transp_maps;
+char *var_fallback_transport;
+char *var_fbck_transp_maps;
+char *var_exec_directory;
+char *var_exec_exp_filter;
+char *var_forward_path;
+char *var_cmd_exp_filter;
+char *var_fwd_exp_filter;
+char *var_prop_extension;
+int var_exp_own_alias;
+char *var_deliver_hdr;
+int var_stat_home_dir;
+int var_mailtool_compat;
+char *var_mailbox_lock;
+long var_mailbox_limit;
+bool var_frozen_delivered;
+bool var_reset_owner_attr;
+bool var_strict_mbox_owner;
+
+int local_cmd_deliver_mask;
+int local_file_deliver_mask;
+int local_ext_prop_mask;
+int local_deliver_hdr_mask;
+int local_mbox_lock_mask;
+MAPS *alias_maps;
+char *var_local_dsn_filter;
+
+/* local_deliver - deliver message with extreme prejudice */
+
+static int local_deliver(DELIVER_REQUEST *rqst, char *service)
+{
+ const char *myname = "local_deliver";
+ RECIPIENT *rcpt_end = rqst->rcpt_list.info + rqst->rcpt_list.len;
+ RECIPIENT *rcpt;
+ int rcpt_stat;
+ int msg_stat;
+ LOCAL_STATE state;
+ USER_ATTR usr_attr;
+
+ if (msg_verbose)
+ msg_info("local_deliver: %s from %s", rqst->queue_id, rqst->sender);
+
+ /*
+ * Initialize the delivery attributes that are not recipient specific.
+ * While messages are being delivered and while aliases or forward files
+ * are being expanded, this attribute list is being changed constantly.
+ * For this reason, the list is passed on by value (except when it is
+ * being initialized :-), so that there is no need to undo attribute
+ * changes made by lower-level routines. The alias/include/forward
+ * expansion attribute list is part of a tree with self and parent
+ * references (see the EXPAND_ATTR definitions). The user-specific
+ * attributes are security sensitive, and are therefore kept separate.
+ * All this results in a noticeable level of clumsiness, but passing
+ * things around by value gives good protection against accidental change
+ * by subroutines.
+ */
+ state.level = 0;
+ deliver_attr_init(&state.msg_attr);
+ state.msg_attr.queue_name = rqst->queue_name;
+ state.msg_attr.queue_id = rqst->queue_id;
+ state.msg_attr.fp = rqst->fp;
+ state.msg_attr.offset = rqst->data_offset;
+ state.msg_attr.encoding = rqst->encoding;
+ state.msg_attr.smtputf8 = rqst->smtputf8;
+ state.msg_attr.sender = rqst->sender;
+ state.msg_attr.dsn_envid = rqst->dsn_envid;
+ state.msg_attr.dsn_ret = rqst->dsn_ret;
+ state.msg_attr.relay = service;
+ state.msg_attr.msg_stats = rqst->msg_stats;
+ state.msg_attr.request = rqst;
+ RESET_OWNER_ATTR(state.msg_attr, state.level);
+ RESET_USER_ATTR(usr_attr, state.level);
+ state.loop_info = delivered_hdr_init(rqst->fp, rqst->data_offset,
+ FOLD_ADDR_ALL);
+ state.request = rqst;
+
+ /*
+ * Iterate over each recipient named in the delivery request. When the
+ * mail delivery status for a given recipient is definite (i.e. bounced
+ * or delivered), update the message queue file and cross off the
+ * recipient. Update the per-message delivery status.
+ */
+ for (msg_stat = 0, rcpt = rqst->rcpt_list.info; rcpt < rcpt_end; rcpt++) {
+ state.dup_filter = been_here_init(var_dup_filter_limit, BH_FLAG_FOLD);
+ forward_init();
+ state.msg_attr.rcpt = *rcpt;
+ rcpt_stat = deliver_recipient(state, usr_attr);
+ rcpt_stat |= forward_finish(rqst, state.msg_attr, rcpt_stat);
+ if (rcpt_stat == 0 && (rqst->flags & DEL_REQ_FLAG_SUCCESS))
+ deliver_completed(state.msg_attr.fp, rcpt->offset);
+ been_here_free(state.dup_filter);
+ msg_stat |= rcpt_stat;
+ }
+
+ /*
+ * Clean up.
+ */
+ delivered_hdr_free(state.loop_info);
+ deliver_attr_free(&state.msg_attr);
+
+ return (msg_stat);
+}
+
+/* local_service - perform service for client */
+
+static void local_service(VSTREAM *stream, char *service, char **argv)
+{
+ DELIVER_REQUEST *request;
+ int status;
+
+ /*
+ * Sanity check. This service takes no command-line arguments.
+ */
+ if (argv[0])
+ msg_fatal("unexpected command-line argument: %s", argv[0]);
+
+ /*
+ * This routine runs whenever a client connects to the UNIX-domain socket
+ * that is dedicated to local mail delivery service. What we see below is
+ * a little protocol to (1) tell the client that we are ready, (2) read a
+ * delivery request from the client, and (3) report the completion status
+ * of that request.
+ */
+ if ((request = deliver_request_read(stream)) != 0) {
+ status = local_deliver(request, service);
+ deliver_request_done(stream, request, status);
+ }
+}
+
+/* local_mask_init - initialize delivery restrictions */
+
+static void local_mask_init(void)
+{
+ static const NAME_MASK file_mask[] = {
+ "alias", EXPAND_TYPE_ALIAS,
+ "forward", EXPAND_TYPE_FWD,
+ "include", EXPAND_TYPE_INCL,
+ 0,
+ };
+ static const NAME_MASK command_mask[] = {
+ "alias", EXPAND_TYPE_ALIAS,
+ "forward", EXPAND_TYPE_FWD,
+ "include", EXPAND_TYPE_INCL,
+ 0,
+ };
+ static const NAME_MASK deliver_mask[] = {
+ "command", DELIVER_HDR_CMD,
+ "file", DELIVER_HDR_FILE,
+ "forward", DELIVER_HDR_FWD,
+ 0,
+ };
+
+ local_file_deliver_mask = name_mask(VAR_ALLOW_FILES, file_mask,
+ var_allow_files);
+ local_cmd_deliver_mask = name_mask(VAR_ALLOW_COMMANDS, command_mask,
+ var_allow_commands);
+ local_ext_prop_mask =
+ ext_prop_mask(VAR_PROP_EXTENSION, var_prop_extension);
+ local_deliver_hdr_mask = name_mask(VAR_DELIVER_HDR, deliver_mask,
+ var_deliver_hdr);
+ local_mbox_lock_mask = mbox_lock_mask(var_mailbox_lock);
+ if (var_mailtool_compat) {
+ msg_warn("%s: deprecated parameter, use \"%s = dotlock\" instead",
+ VAR_MAILTOOL_COMPAT, VAR_MAILBOX_LOCK);
+ local_mbox_lock_mask &= MBOX_DOT_LOCK;
+ }
+ if (local_mbox_lock_mask == 0)
+ msg_fatal("parameter %s specifies no applicable mailbox locking method",
+ VAR_MAILBOX_LOCK);
+}
+
+/* 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);
+ }
+}
+
+/* post_init - post-jail initialization */
+
+static void post_init(char *unused_name, char **unused_argv)
+{
+
+ /*
+ * Drop privileges most of the time, and set up delivery restrictions.
+ */
+ set_eugid(var_owner_uid, var_owner_gid);
+ local_mask_init();
+}
+
+/* pre_init - pre-jail initialization */
+
+static void pre_init(char *unused_name, char **unused_argv)
+{
+
+ /*
+ * Reset the file size limit from the message size limit to the mailbox
+ * size limit. XXX This still isn't accurate because the file size limit
+ * also affects delivery to command.
+ *
+ * A file size limit protects the machine against runaway software errors.
+ * It is not suitable to enforce mail quota, because users can get around
+ * mail quota by delivering to /file/name or to |command.
+ *
+ * We can't have mailbox size limit smaller than the message size limit,
+ * because that prohibits the delivery agent from updating the queue
+ * file.
+ */
+ if (ENFORCING_SIZE_LIMIT(var_mailbox_limit)) {
+ if (!ENFORCING_SIZE_LIMIT(var_message_limit))
+ msg_fatal("configuration error: %s is limited but %s is "
+ "unlimited", VAR_MAILBOX_LIMIT, VAR_MESSAGE_LIMIT);
+ if (var_mailbox_limit < var_message_limit)
+ msg_fatal("configuration error: %s is smaller than %s",
+ VAR_MAILBOX_LIMIT, VAR_MESSAGE_LIMIT);
+ set_file_limit(var_mailbox_limit);
+ }
+ alias_maps = maps_create("aliases", var_alias_maps,
+ DICT_FLAG_LOCK | DICT_FLAG_PARANOID
+ | DICT_FLAG_FOLD_FIX
+ | DICT_FLAG_UTF8_REQUEST);
+
+ flush_init();
+}
+
+MAIL_VERSION_STAMP_DECLARE;
+
+/* main - pass control to the single-threaded skeleton */
+
+int main(int argc, char **argv)
+{
+ static const CONFIG_TIME_TABLE time_table[] = {
+ VAR_COMMAND_MAXTIME, DEF_COMMAND_MAXTIME, &var_command_maxtime, 1, 0,
+ 0,
+ };
+ static const CONFIG_INT_TABLE int_table[] = {
+ VAR_DUP_FILTER_LIMIT, DEF_DUP_FILTER_LIMIT, &var_dup_filter_limit, 0, 0,
+ 0,
+ };
+ static const CONFIG_LONG_TABLE long_table[] = {
+ VAR_MAILBOX_LIMIT, DEF_MAILBOX_LIMIT, &var_mailbox_limit, 0, 0,
+ 0,
+ };
+ static const CONFIG_STR_TABLE str_table[] = {
+ VAR_ALIAS_MAPS, DEF_ALIAS_MAPS, &var_alias_maps, 0, 0,
+ VAR_HOME_MAILBOX, DEF_HOME_MAILBOX, &var_home_mailbox, 0, 0,
+ VAR_ALLOW_COMMANDS, DEF_ALLOW_COMMANDS, &var_allow_commands, 0, 0,
+ VAR_ALLOW_FILES, DEF_ALLOW_FILES, &var_allow_files, 0, 0,
+ VAR_LOCAL_CMD_SHELL, DEF_LOCAL_CMD_SHELL, &var_local_cmd_shell, 0, 0,
+ VAR_MAIL_SPOOL_DIR, DEF_MAIL_SPOOL_DIR, &var_mail_spool_dir, 0, 0,
+ VAR_MAILBOX_TRANSP, DEF_MAILBOX_TRANSP, &var_mailbox_transport, 0, 0,
+ VAR_MBOX_TRANSP_MAPS, DEF_MBOX_TRANSP_MAPS, &var_mbox_transp_maps, 0, 0,
+ VAR_FALLBACK_TRANSP, DEF_FALLBACK_TRANSP, &var_fallback_transport, 0, 0,
+ VAR_FBCK_TRANSP_MAPS, DEF_FBCK_TRANSP_MAPS, &var_fbck_transp_maps, 0, 0,
+ VAR_CMD_EXP_FILTER, DEF_CMD_EXP_FILTER, &var_cmd_exp_filter, 1, 0,
+ VAR_FWD_EXP_FILTER, DEF_FWD_EXP_FILTER, &var_fwd_exp_filter, 1, 0,
+ VAR_EXEC_EXP_FILTER, DEF_EXEC_EXP_FILTER, &var_exec_exp_filter, 1, 0,
+ VAR_PROP_EXTENSION, DEF_PROP_EXTENSION, &var_prop_extension, 0, 0,
+ VAR_DELIVER_HDR, DEF_DELIVER_HDR, &var_deliver_hdr, 0, 0,
+ VAR_MAILBOX_LOCK, DEF_MAILBOX_LOCK, &var_mailbox_lock, 1, 0,
+ VAR_MAILBOX_CMD_MAPS, DEF_MAILBOX_CMD_MAPS, &var_mailbox_cmd_maps, 0, 0,
+ VAR_LOCAL_DSN_FILTER, DEF_LOCAL_DSN_FILTER, &var_local_dsn_filter, 0, 0,
+ 0,
+ };
+ static const CONFIG_BOOL_TABLE bool_table[] = {
+ VAR_BIFF, DEF_BIFF, &var_biff,
+ VAR_EXP_OWN_ALIAS, DEF_EXP_OWN_ALIAS, &var_exp_own_alias,
+ VAR_STAT_HOME_DIR, DEF_STAT_HOME_DIR, &var_stat_home_dir,
+ VAR_MAILTOOL_COMPAT, DEF_MAILTOOL_COMPAT, &var_mailtool_compat,
+ VAR_FROZEN_DELIVERED, DEF_FROZEN_DELIVERED, &var_frozen_delivered,
+ VAR_RESET_OWNER_ATTR, DEF_RESET_OWNER_ATTR, &var_reset_owner_attr,
+ VAR_STRICT_MBOX_OWNER, DEF_STRICT_MBOX_OWNER, &var_strict_mbox_owner,
+ 0,
+ };
+
+ /* Suppress $name expansion upon loading. */
+ static const CONFIG_RAW_TABLE raw_table[] = {
+ VAR_EXEC_DIRECTORY, DEF_EXEC_DIRECTORY, &var_exec_directory, 0, 0,
+ VAR_FORWARD_PATH, DEF_FORWARD_PATH, &var_forward_path, 0, 0,
+ VAR_MAILBOX_COMMAND, DEF_MAILBOX_COMMAND, &var_mailbox_command, 0, 0,
+ VAR_LUSER_RELAY, DEF_LUSER_RELAY, &var_luser_relay, 0, 0,
+ 0,
+ };
+
+ /*
+ * Fingerprint executables and core dumps.
+ */
+ MAIL_VERSION_STAMP_ALLOCATE;
+
+ single_server_main(argc, argv, local_service,
+ CA_MAIL_SERVER_INT_TABLE(int_table),
+ CA_MAIL_SERVER_LONG_TABLE(long_table),
+ CA_MAIL_SERVER_STR_TABLE(str_table),
+ CA_MAIL_SERVER_RAW_TABLE(raw_table),
+ CA_MAIL_SERVER_BOOL_TABLE(bool_table),
+ CA_MAIL_SERVER_TIME_TABLE(time_table),
+ CA_MAIL_SERVER_PRE_INIT(pre_init),
+ CA_MAIL_SERVER_POST_INIT(post_init),
+ CA_MAIL_SERVER_PRE_ACCEPT(pre_accept),
+ CA_MAIL_SERVER_PRIVILEGED,
+ CA_MAIL_SERVER_BOUNCE_INIT(VAR_LOCAL_DSN_FILTER,
+ &var_local_dsn_filter),
+ 0);
+}