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+/*++
+/* NAME
+/* virtual 8
+/* SUMMARY
+/* Postfix virtual domain mail delivery agent
+/* SYNOPSIS
+/* \fBvirtual\fR [generic Postfix daemon options]
+/* DESCRIPTION
+/* The \fBvirtual\fR(8) delivery agent is designed for virtual mail
+/* hosting services. Originally based on the Postfix \fBlocal\fR(8)
+/* delivery
+/* agent, this agent looks up recipients with map lookups of their
+/* full recipient address, instead of using hard-coded unix password
+/* file lookups of the address local part only.
+/*
+/* This delivery agent only delivers mail. Other features such as
+/* mail forwarding, out-of-office notifications, etc., must be
+/* configured via virtual_alias maps or via similar lookup mechanisms.
+/* MAILBOX LOCATION
+/* .ad
+/* .fi
+/* The mailbox location is controlled by the \fBvirtual_mailbox_base\fR
+/* and \fBvirtual_mailbox_maps\fR configuration parameters (see below).
+/* The \fBvirtual_mailbox_maps\fR table is indexed by the recipient
+/* address as described under TABLE SEARCH ORDER below.
+/*
+/* The mailbox pathname is constructed as follows:
+/*
+/* .nf
+/* \fB$virtual_mailbox_base/$virtual_mailbox_maps(\fIrecipient\fB)\fR
+/* .fi
+/*
+/* where \fIrecipient\fR is the full recipient address.
+/* UNIX MAILBOX FORMAT
+/* .ad
+/* .fi
+/* When the mailbox location does not end in \fB/\fR, the message
+/* is delivered in UNIX mailbox format. This format stores multiple
+/* messages in one textfile.
+/*
+/* The \fBvirtual\fR(8) delivery agent prepends a "\fBFrom \fIsender
+/* time_stamp\fR" envelope header to each message, prepends a
+/* \fBDelivered-To:\fR message header with the envelope recipient
+/* address,
+/* prepends an \fBX-Original-To:\fR header with the recipient address as
+/* given to Postfix,
+/* prepends a \fBReturn-Path:\fR message 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.
+/* QMAIL MAILDIR FORMAT
+/* .ad
+/* .fi
+/* When the mailbox location ends in \fB/\fR, the message is delivered
+/* in qmail \fBmaildir\fR format. This format stores one message per file.
+/*
+/* The \fBvirtual\fR(8) delivery agent prepends a \fBDelivered-To:\fR
+/* message 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 message header with the envelope sender address.
+/*
+/* By definition, \fBmaildir\fR format does not require application-level
+/* file locking during mail delivery or retrieval.
+/* MAILBOX OWNERSHIP
+/* .ad
+/* .fi
+/* Mailbox ownership is controlled by the \fBvirtual_uid_maps\fR
+/* and \fBvirtual_gid_maps\fR lookup tables, which are indexed
+/* with the full recipient address. Each table provides
+/* a string with the numerical user and group ID, respectively.
+/*
+/* The \fBvirtual_minimum_uid\fR parameter imposes a lower bound on
+/* numerical user ID values that may be specified in any
+/* \fBvirtual_uid_maps\fR.
+/* CASE FOLDING
+/* .ad
+/* .fi
+/* All delivery decisions are made using the full recipient
+/* address, folded to lower case. See also the next section
+/* for a few exceptions with optional address extensions.
+/* TABLE SEARCH ORDER
+/* .ad
+/* .fi
+/* Normally, a lookup table is specified as a text file that
+/* serves as input to the \fBpostmap\fR(1) command. The result, an
+/* indexed file in \fBdbm\fR or \fBdb\fR format, is used for fast
+/* searching by the mail system.
+/*
+/* The search order is as follows. The search stops
+/* upon the first successful lookup.
+/* .IP \(bu
+/* When the recipient has an optional address extension the
+/* \fIuser+extension@domain.tld\fR address is looked up first.
+/* .sp
+/* With Postfix versions before 2.1, the optional address extension
+/* is always ignored.
+/* .IP \(bu
+/* The \fIuser@domain.tld\fR address, without address extension,
+/* is looked up next.
+/* .IP \(bu
+/* Finally, the recipient \fI@domain\fR is looked up.
+/* .PP
+/* When the table is provided via other means such as NIS, LDAP
+/* or SQL, the same lookups are done as for ordinary indexed files.
+/*
+/* Alternatively, a table can be provided as a regular-expression
+/* map where patterns are given as regular expressions. In that case,
+/* only the full recipient address is given to the regular-expression
+/* map.
+/* SECURITY
+/* .ad
+/* .fi
+/* The \fBvirtual\fR(8) delivery agent is not security sensitive, provided
+/* that the lookup tables with recipient user/group ID information are
+/* adequately protected. This program is not designed to run chrooted.
+/*
+/* The \fBvirtual\fR(8) delivery agent disallows regular expression
+/* substitution of $1 etc. in regular expression lookup tables,
+/* because that would open a security hole.
+/*
+/* The \fBvirtual\fR(8) delivery agent will silently ignore requests
+/* to use the \fBproxymap\fR(8) server. Instead it will open the
+/* table directly. Before Postfix version 2.2, the virtual
+/* delivery agent will terminate with a fatal error.
+/* STANDARDS
+/* RFC 822 (ARPA Internet Text Messages)
+/* DIAGNOSTICS
+/* Mail bounces when the recipient has no mailbox or when the
+/* recipient is over disk quota. In all other cases, mail for
+/* an existing recipient is deferred and a warning is logged.
+/*
+/* 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.
+/* BUGS
+/* This delivery agent supports address extensions in email
+/* addresses and in lookup table keys, but does not propagate
+/* address extension information to the result of table lookup.
+/*
+/* Postfix should have lookup tables that can return multiple result
+/* attributes. In order to avoid the inconvenience of maintaining
+/* three tables, use an LDAP or MYSQL database.
+/* CONFIGURATION PARAMETERS
+/* .ad
+/* .fi
+/* Changes to \fBmain.cf\fR are picked up automatically, as
+/* \fBvirtual\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.
+/* MAILBOX DELIVERY CONTROLS
+/* .ad
+/* .fi
+/* .IP "\fBvirtual_mailbox_base (empty)\fR"
+/* A prefix that the \fBvirtual\fR(8) delivery agent prepends to all pathname
+/* results from $virtual_mailbox_maps table lookups.
+/* .IP "\fBvirtual_mailbox_maps (empty)\fR"
+/* Optional lookup tables with all valid addresses in the domains that
+/* match $virtual_mailbox_domains.
+/* .IP "\fBvirtual_minimum_uid (100)\fR"
+/* The minimum user ID value that the \fBvirtual\fR(8) delivery agent accepts
+/* as a result from $virtual_uid_maps table lookup.
+/* .IP "\fBvirtual_uid_maps (empty)\fR"
+/* Lookup tables with the per-recipient user ID that the \fBvirtual\fR(8)
+/* delivery agent uses while writing to the recipient's mailbox.
+/* .IP "\fBvirtual_gid_maps (empty)\fR"
+/* Lookup tables with the per-recipient group ID for \fBvirtual\fR(8) mailbox
+/* delivery.
+/* .PP
+/* Available in Postfix version 2.0 and later:
+/* .IP "\fBvirtual_mailbox_domains ($virtual_mailbox_maps)\fR"
+/* Postfix is final destination for the specified list of domains;
+/* mail is delivered via the $virtual_transport mail delivery transport.
+/* .IP "\fBvirtual_transport (virtual)\fR"
+/* The default mail delivery transport and next-hop destination for
+/* final delivery to domains listed with $virtual_mailbox_domains.
+/* .PP
+/* Available in Postfix version 2.5.3 and later:
+/* .IP "\fBstrict_mailbox_ownership (yes)\fR"
+/* Defer delivery when a mailbox file is not owned by its recipient.
+/* LOCKING CONTROLS
+/* .ad
+/* .fi
+/* .IP "\fBvirtual_mailbox_lock (see 'postconf -d' output)\fR"
+/* How to lock a UNIX-style \fBvirtual\fR(8) mailbox before attempting
+/* delivery.
+/* .IP "\fBdeliver_lock_attempts (20)\fR"
+/* The maximal number of attempts to acquire an exclusive lock on a
+/* mailbox file or \fBbounce\fR(8) logfile.
+/* .IP "\fBdeliver_lock_delay (1s)\fR"
+/* The time between attempts to acquire an exclusive lock on a mailbox
+/* file or \fBbounce\fR(8) logfile.
+/* .IP "\fBstale_lock_time (500s)\fR"
+/* The time after which a stale exclusive mailbox lockfile is removed.
+/* RESOURCE AND RATE CONTROLS
+/* .ad
+/* .fi
+/* .IP "\fBvirtual_mailbox_limit (51200000)\fR"
+/* The maximal size in bytes of an individual \fBvirtual\fR(8) mailbox or
+/* maildir file, or zero (no limit).
+/* .PP
+/* Implemented in the qmgr(8) daemon:
+/* .IP "\fBvirtual_destination_concurrency_limit ($default_destination_concurrency_limit)\fR"
+/* The maximal number of parallel deliveries to the same destination
+/* via the virtual message delivery transport.
+/* .IP "\fBvirtual_destination_recipient_limit ($default_destination_recipient_limit)\fR"
+/* The maximal number of recipients per message for the virtual
+/* message delivery transport.
+/* MISCELLANEOUS CONTROLS
+/* .ad
+/* .fi
+/* .IP "\fBconfig_directory (see 'postconf -d' output)\fR"
+/* The default location of the Postfix main.cf and master.cf
+/* configuration files.
+/* .IP "\fBdaemon_timeout (18000s)\fR"
+/* How much time a Postfix daemon process may take to handle a
+/* request before it is terminated by a built-in watchdog timer.
+/* .IP "\fBdelay_logging_resolution_limit (2)\fR"
+/* The maximal number of digits after the decimal point when logging
+/* sub-second delay values.
+/* .IP "\fBipc_timeout (3600s)\fR"
+/* The time limit for sending or receiving information over an internal
+/* communication channel.
+/* .IP "\fBmax_idle (100s)\fR"
+/* The maximum amount of time that an idle Postfix daemon process waits
+/* for an incoming connection before terminating voluntarily.
+/* .IP "\fBmax_use (100)\fR"
+/* The maximal number of incoming connections that a Postfix daemon
+/* process will service before terminating voluntarily.
+/* .IP "\fBprocess_id (read-only)\fR"
+/* The process ID of a Postfix command or daemon process.
+/* .IP "\fBprocess_name (read-only)\fR"
+/* The process name of a Postfix command or daemon process.
+/* .IP "\fBqueue_directory (see 'postconf -d' output)\fR"
+/* The location of the Postfix top-level queue directory.
+/* .IP "\fBsyslog_facility (mail)\fR"
+/* The syslog facility of Postfix logging.
+/* .IP "\fBsyslog_name (see 'postconf -d' output)\fR"
+/* A prefix that is prepended to the process name in syslog
+/* records, so that, for example, "smtpd" becomes "prefix/smtpd".
+/* .PP
+/* Available in Postfix version 3.0 and later:
+/* .IP "\fBvirtual_delivery_status_filter ($default_delivery_status_filter)\fR"
+/* Optional filter for the \fBvirtual\fR(8) delivery agent to change the
+/* delivery status code or explanatory text of successful or unsuccessful
+/* deliveries.
+/* .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.).
+/* SEE ALSO
+/* qmgr(8), queue manager
+/* bounce(8), delivery status reports
+/* postconf(5), configuration parameters
+/* postlogd(8), Postfix logging
+/* syslogd(8), system logging
+/* README_FILES
+/* Use "\fBpostconf readme_directory\fR" or
+/* "\fBpostconf html_directory\fR" to locate this information.
+/* VIRTUAL_README, domain hosting howto
+/* LICENSE
+/* .ad
+/* .fi
+/* The Secure Mailer license must be distributed with this software.
+/* HISTORY
+/* .ad
+/* .fi
+/* This delivery agent was originally based on the Postfix local delivery
+/* agent. Modifications mainly consisted of removing code that either
+/* was not applicable or that was not safe in this context: aliases,
+/* ~user/.forward files, delivery to "|command" or to /file/name.
+/*
+/* The \fBDelivered-To:\fR message header appears in the \fBqmail\fR
+/* system by Daniel Bernstein.
+/*
+/* The \fBmaildir\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
+/*
+/* Andrew McNamara
+/* andrewm@connect.com.au
+/* connect.com.au Pty. Ltd.
+/* Level 3, 213 Miller St
+/* North Sydney 2060, NSW, Australia
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <stdlib.h>
+#ifdef USE_PATHS_H
+#include <paths.h> /* XXX mail_spool_dir dependency */
+#endif
+
+/* Utility library. */
+
+#include <msg.h>
+#include <vstring.h>
+#include <vstream.h>
+#include <iostuff.h>
+#include <set_eugid.h>
+#include <dict.h>
+
+/* Global library. */
+
+#include <mail_queue.h>
+#include <recipient_list.h>
+#include <deliver_request.h>
+#include <deliver_completed.h>
+#include <mail_params.h>
+#include <mail_version.h>
+#include <mail_conf.h>
+#include <mail_params.h>
+#include <mail_addr_find.h>
+#include <flush_clnt.h>
+
+/* Single server skeleton. */
+
+#include <mail_server.h>
+
+/* Application-specific. */
+
+#include "virtual.h"
+
+ /*
+ * Tunable parameters.
+ */
+char *var_virt_mailbox_maps;
+char *var_virt_uid_maps;
+char *var_virt_gid_maps;
+int var_virt_minimum_uid;
+char *var_virt_mailbox_base;
+char *var_virt_mailbox_lock;
+long var_virt_mailbox_limit;
+char *var_mail_spool_dir; /* XXX dependency fix */
+bool var_strict_mbox_owner;
+char *var_virt_dsn_filter;
+
+ /*
+ * Mappings.
+ */
+MAPS *virtual_mailbox_maps;
+MAPS *virtual_uid_maps;
+MAPS *virtual_gid_maps;
+
+ /*
+ * Bit masks.
+ */
+int virtual_mbox_lock_mask;
+
+/* 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.
+ */
+ 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.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;
+ RESET_USER_ATTR(usr_attr, state.level);
+ 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.msg_attr.rcpt = *rcpt;
+ rcpt_stat = deliver_recipient(state, usr_attr);
+ if (rcpt_stat == 0 && (rqst->flags & DEL_REQ_FLAG_SUCCESS))
+ deliver_completed(state.msg_attr.fp, rcpt->offset);
+ msg_stat |= rcpt_stat;
+ }
+
+ 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);
+ }
+}
+
+/* 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.
+ */
+ set_eugid(var_owner_uid, var_owner_gid);
+
+ /*
+ * No case folding needed: the recipient address is case folded.
+ */
+ virtual_mailbox_maps =
+ maps_create(VAR_VIRT_MAILBOX_MAPS, var_virt_mailbox_maps,
+ DICT_FLAG_LOCK | DICT_FLAG_PARANOID
+ | DICT_FLAG_UTF8_REQUEST);
+
+ virtual_uid_maps =
+ maps_create(VAR_VIRT_UID_MAPS, var_virt_uid_maps,
+ DICT_FLAG_LOCK | DICT_FLAG_PARANOID
+ | DICT_FLAG_UTF8_REQUEST);
+
+ virtual_gid_maps =
+ maps_create(VAR_VIRT_GID_MAPS, var_virt_gid_maps,
+ DICT_FLAG_LOCK | DICT_FLAG_PARANOID
+ | DICT_FLAG_UTF8_REQUEST);
+
+ virtual_mbox_lock_mask = mbox_lock_mask(var_virt_mailbox_lock);
+}
+
+/* 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.
+ *
+ * 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_virt_mailbox_limit)) {
+ if (!ENFORCING_SIZE_LIMIT(var_message_limit))
+ msg_fatal("configuration error: %s is limited but %s is "
+ "unlimited", VAR_VIRT_MAILBOX_LIMIT, VAR_MESSAGE_LIMIT);
+ if (var_virt_mailbox_limit < var_message_limit)
+ msg_fatal("configuration error: %s is smaller than %s",
+ VAR_VIRT_MAILBOX_LIMIT, VAR_MESSAGE_LIMIT);
+ set_file_limit(var_virt_mailbox_limit);
+ }
+
+ /*
+ * flush client.
+ */
+ flush_init();
+}
+
+MAIL_VERSION_STAMP_DECLARE;
+
+/* main - pass control to the single-threaded skeleton */
+
+int main(int argc, char **argv)
+{
+ static const CONFIG_INT_TABLE int_table[] = {
+ VAR_VIRT_MINUID, DEF_VIRT_MINUID, &var_virt_minimum_uid, 1, 0,
+ 0,
+ };
+ static const CONFIG_LONG_TABLE long_table[] = {
+ VAR_VIRT_MAILBOX_LIMIT, DEF_VIRT_MAILBOX_LIMIT, &var_virt_mailbox_limit, 0, 0,
+ 0,
+ };
+ static const CONFIG_STR_TABLE str_table[] = {
+ VAR_MAIL_SPOOL_DIR, DEF_MAIL_SPOOL_DIR, &var_mail_spool_dir, 0, 0,
+ VAR_VIRT_MAILBOX_MAPS, DEF_VIRT_MAILBOX_MAPS, &var_virt_mailbox_maps, 0, 0,
+ VAR_VIRT_UID_MAPS, DEF_VIRT_UID_MAPS, &var_virt_uid_maps, 0, 0,
+ VAR_VIRT_GID_MAPS, DEF_VIRT_GID_MAPS, &var_virt_gid_maps, 0, 0,
+ VAR_VIRT_MAILBOX_BASE, DEF_VIRT_MAILBOX_BASE, &var_virt_mailbox_base, 1, 0,
+ VAR_VIRT_MAILBOX_LOCK, DEF_VIRT_MAILBOX_LOCK, &var_virt_mailbox_lock, 1, 0,
+ VAR_VIRT_DSN_FILTER, DEF_VIRT_DSN_FILTER, &var_virt_dsn_filter, 0, 0,
+ 0,
+ };
+ static const CONFIG_BOOL_TABLE bool_table[] = {
+ VAR_STRICT_MBOX_OWNER, DEF_STRICT_MBOX_OWNER, &var_strict_mbox_owner,
+ 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_BOOL_TABLE(bool_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_VIRT_DSN_FILTER,
+ &var_virt_dsn_filter),
+ 0);
+}