/*++ /* NAME /* postscreen 8 /* SUMMARY /* Postfix zombie blocker /* SYNOPSIS /* \fBpostscreen\fR [generic Postfix daemon options] /* DESCRIPTION /* The Postfix \fBpostscreen\fR(8) server provides additional /* protection against mail server overload. One \fBpostscreen\fR(8) /* process handles multiple inbound SMTP connections, and decides /* which clients may talk to a Postfix SMTP server process. /* By keeping spambots away, \fBpostscreen\fR(8) leaves more /* SMTP server processes available for legitimate clients, and /* delays the onset of server overload conditions. /* /* This program should not be used on SMTP ports that receive /* mail from end-user clients (MUAs). In a typical deployment, /* \fBpostscreen\fR(8) handles the MX service on TCP port 25, and /* \fBsmtpd\fR(8) receives mail from MUAs on the \fBsubmission\fR /* service (TCP port 587) which requires client authentication. /* Alternatively, a site could set up a dedicated, non-postscreen, /* "port 25" server that provides \fBsubmission\fR service and /* client authentication, but no MX service. /* /* \fBpostscreen\fR(8) maintains a temporary whitelist for /* clients that have passed a number of tests. When an SMTP /* client IP address is whitelisted, \fBpostscreen\fR(8) hands /* off the connection immediately to a Postfix SMTP server /* process. This minimizes the overhead for legitimate mail. /* /* By default, \fBpostscreen\fR(8) logs statistics and hands /* off each connection to a Postfix SMTP server process, while /* excluding clients in mynetworks from all tests (primarily, /* to avoid problems with non-standard SMTP implementations /* in network appliances). This default mode blocks no clients, /* and is useful for non-destructive testing. /* /* In a typical production setting, \fBpostscreen\fR(8) is /* configured to reject mail from clients that fail one or /* more tests. \fBpostscreen\fR(8) logs rejected mail with the /* client address, helo, sender and recipient information. /* /* \fBpostscreen\fR(8) is not an SMTP proxy; this is intentional. /* The purpose is to keep spambots away from Postfix SMTP /* server processes, while minimizing overhead for legitimate /* traffic. /* SECURITY /* .ad /* .fi /* The \fBpostscreen\fR(8) server is moderately security-sensitive. /* It talks to untrusted clients on the network. The process /* 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 2034 (SMTP Enhanced Status Codes) /* RFC 2821 (SMTP protocol) /* Not: RFC 2920 (SMTP Pipelining) /* RFC 3030 (CHUNKING without BINARYMIME) /* RFC 3207 (STARTTLS command) /* RFC 3461 (SMTP DSN Extension) /* RFC 3463 (Enhanced Status Codes) /* RFC 5321 (SMTP protocol, including multi-line 220 banners) /* DIAGNOSTICS /* Problems and transactions are logged to \fBsyslogd\fR(8) /* or \fBpostlogd\fR(8). /* BUGS /* The \fBpostscreen\fR(8) built-in SMTP protocol engine /* currently does not announce support for AUTH, XCLIENT or /* XFORWARD. /* If you need to make these services available /* on port 25, then do not enable the optional "after 220 /* server greeting" tests. /* /* The optional "after 220 server greeting" tests may result in /* unexpected delivery delays from senders that retry email delivery /* from a different IP address. Reason: after passing these tests a /* new client must disconnect, and reconnect from the same IP /* address before it can deliver mail. See POSTSCREEN_README, section /* "Tests after the 220 SMTP server greeting", for a discussion. /* CONFIGURATION PARAMETERS /* .ad /* .fi /* Changes to main.cf are not picked up automatically, as /* \fBpostscreen\fR(8) processes may run for several hours. /* Use the command "postfix reload" after a configuration /* change. /* /* The text below provides only a parameter summary. See /* \fBpostconf\fR(5) for more details including examples. /* /* NOTE: Some \fBpostscreen\fR(8) parameters implement /* stress-dependent behavior. This is supported only when the /* default parameter value is stress-dependent (that is, it /* looks like ${stress?{X}:{Y}}, or it is the $\fIname\fR /* of an smtpd parameter with a stress-dependent default). /* Other parameters always evaluate as if the \fBstress\fR /* parameter value is the empty string. /* COMPATIBILITY CONTROLS /* .ad /* .fi /* .IP "\fBpostscreen_command_filter ($smtpd_command_filter)\fR" /* A mechanism to transform commands from remote SMTP clients. /* .IP "\fBpostscreen_discard_ehlo_keyword_address_maps ($smtpd_discard_ehlo_keyword_address_maps)\fR" /* Lookup tables, indexed by the remote SMTP client address, with /* case insensitive lists of EHLO keywords (pipelining, starttls, auth, /* etc.) that the \fBpostscreen\fR(8) server will not send in the EHLO response /* to a remote SMTP client. /* .IP "\fBpostscreen_discard_ehlo_keywords ($smtpd_discard_ehlo_keywords)\fR" /* A case insensitive list of EHLO keywords (pipelining, starttls, /* auth, etc.) that the \fBpostscreen\fR(8) server will not send in the EHLO /* response to a remote SMTP client. /* .PP /* Available in Postfix version 3.1 and later: /* .IP "\fBdns_ncache_ttl_fix_enable (no)\fR" /* Enable a workaround for future libc incompatibility. /* .PP /* Available in Postfix version 3.4 and later: /* .IP "\fBpostscreen_reject_footer_maps ($smtpd_reject_footer_maps)\fR" /* Optional lookup table for information that is appended after a 4XX /* or 5XX \fBpostscreen\fR(8) server response. /* TROUBLE SHOOTING CONTROLS /* .ad /* .fi /* .IP "\fBpostscreen_expansion_filter (see 'postconf -d' output)\fR" /* List of characters that are permitted in postscreen_reject_footer /* attribute expansions. /* .IP "\fBpostscreen_reject_footer ($smtpd_reject_footer)\fR" /* Optional information that is appended after a 4XX or 5XX /* \fBpostscreen\fR(8) server /* response. /* .IP "\fBsoft_bounce (no)\fR" /* Safety net to keep mail queued that would otherwise be returned to /* the sender. /* BEFORE-POSTSCREEN PROXY AGENT /* .ad /* .fi /* Available in Postfix version 2.10 and later: /* .IP "\fBpostscreen_upstream_proxy_protocol (empty)\fR" /* The name of the proxy protocol used by an optional before-postscreen /* proxy agent. /* .IP "\fBpostscreen_upstream_proxy_timeout (5s)\fR" /* The time limit for the proxy protocol specified with the /* postscreen_upstream_proxy_protocol parameter. /* PERMANENT WHITE/BLACKLIST TEST /* .ad /* .fi /* This test is executed immediately after a remote SMTP client /* connects. If a client is permanently whitelisted, the client /* will be handed off immediately to a Postfix SMTP server /* process. /* .IP "\fBpostscreen_access_list (permit_mynetworks)\fR" /* Permanent white/blacklist for remote SMTP client IP addresses. /* .IP "\fBpostscreen_blacklist_action (ignore)\fR" /* The action that \fBpostscreen\fR(8) takes when a remote SMTP client is /* permanently blacklisted with the postscreen_access_list parameter. /* MAIL EXCHANGER POLICY TESTS /* .ad /* .fi /* When \fBpostscreen\fR(8) is configured to monitor all primary /* and backup MX addresses, it can refuse to whitelist clients /* that connect to a backup MX address only. For small sites, /* this requires configuring primary and backup MX addresses /* on the same MTA. Larger sites would have to share the /* \fBpostscreen\fR(8) cache between primary and backup MTAs, /* which would introduce a common point of failure. /* .IP "\fBpostscreen_whitelist_interfaces (static:all)\fR" /* A list of local \fBpostscreen\fR(8) server IP addresses where a /* non-whitelisted remote SMTP client can obtain \fBpostscreen\fR(8)'s temporary /* whitelist status. /* BEFORE 220 GREETING TESTS /* .ad /* .fi /* These tests are executed before the remote SMTP client /* receives the "220 servername" greeting. If no tests remain /* after the successful completion of this phase, the client /* will be handed off immediately to a Postfix SMTP server /* process. /* .IP "\fBdnsblog_service_name (dnsblog)\fR" /* The name of the \fBdnsblog\fR(8) service entry in master.cf. /* .IP "\fBpostscreen_dnsbl_action (ignore)\fR" /* The action that \fBpostscreen\fR(8) takes when a remote SMTP client's combined /* DNSBL score is equal to or greater than a threshold (as defined /* with the postscreen_dnsbl_sites and postscreen_dnsbl_threshold /* parameters). /* .IP "\fBpostscreen_dnsbl_reply_map (empty)\fR" /* A mapping from actual DNSBL domain name which includes a secret /* password, to the DNSBL domain name that postscreen will reply with /* when it rejects mail. /* .IP "\fBpostscreen_dnsbl_sites (empty)\fR" /* Optional list of DNS white/blacklist domains, filters and weight /* factors. /* .IP "\fBpostscreen_dnsbl_threshold (1)\fR" /* The inclusive lower bound for blocking a remote SMTP client, based on /* its combined DNSBL score as defined with the postscreen_dnsbl_sites /* parameter. /* .IP "\fBpostscreen_greet_action (ignore)\fR" /* The action that \fBpostscreen\fR(8) takes when a remote SMTP client speaks /* before its turn within the time specified with the postscreen_greet_wait /* parameter. /* .IP "\fBpostscreen_greet_banner ($smtpd_banner)\fR" /* The \fItext\fR in the optional "220-\fItext\fR..." server /* response that /* \fBpostscreen\fR(8) sends ahead of the real Postfix SMTP server's "220 /* text..." response, in an attempt to confuse bad SMTP clients so /* that they speak before their turn (pre-greet). /* .IP "\fBpostscreen_greet_wait (normal: 6s, overload: 2s)\fR" /* The amount of time that \fBpostscreen\fR(8) will wait for an SMTP /* client to send a command before its turn, and for DNS blocklist /* lookup results to arrive (default: up to 2 seconds under stress, /* up to 6 seconds otherwise). /* .IP "\fBsmtpd_service_name (smtpd)\fR" /* The internal service that \fBpostscreen\fR(8) hands off allowed /* connections to. /* .PP /* Available in Postfix version 2.11 and later: /* .IP "\fBpostscreen_dnsbl_whitelist_threshold (0)\fR" /* Allow a remote SMTP client to skip "before" and "after 220 /* greeting" protocol tests, based on its combined DNSBL score as /* defined with the postscreen_dnsbl_sites parameter. /* .PP /* Available in Postfix version 3.0 and later: /* .IP "\fBpostscreen_dnsbl_timeout (10s)\fR" /* The time limit for DNSBL or DNSWL lookups. /* AFTER 220 GREETING TESTS /* .ad /* .fi /* These tests are executed after the remote SMTP client /* receives the "220 servername" greeting. If a client passes /* all tests during this phase, it will receive a 4XX response /* to all RCPT TO commands. After the client reconnects, it /* will be allowed to talk directly to a Postfix SMTP server /* process. /* .IP "\fBpostscreen_bare_newline_action (ignore)\fR" /* The action that \fBpostscreen\fR(8) takes when a remote SMTP client sends /* a bare newline character, that is, a newline not preceded by carriage /* return. /* .IP "\fBpostscreen_bare_newline_enable (no)\fR" /* Enable "bare newline" SMTP protocol tests in the \fBpostscreen\fR(8) /* server. /* .IP "\fBpostscreen_disable_vrfy_command ($disable_vrfy_command)\fR" /* Disable the SMTP VRFY command in the \fBpostscreen\fR(8) daemon. /* .IP "\fBpostscreen_forbidden_commands ($smtpd_forbidden_commands)\fR" /* List of commands that the \fBpostscreen\fR(8) server considers in /* violation of the SMTP protocol. /* .IP "\fBpostscreen_helo_required ($smtpd_helo_required)\fR" /* Require that a remote SMTP client sends HELO or EHLO before /* commencing a MAIL transaction. /* .IP "\fBpostscreen_non_smtp_command_action (drop)\fR" /* The action that \fBpostscreen\fR(8) takes when a remote SMTP client sends /* non-SMTP commands as specified with the postscreen_forbidden_commands /* parameter. /* .IP "\fBpostscreen_non_smtp_command_enable (no)\fR" /* Enable "non-SMTP command" tests in the \fBpostscreen\fR(8) server. /* .IP "\fBpostscreen_pipelining_action (enforce)\fR" /* The action that \fBpostscreen\fR(8) takes when a remote SMTP client /* sends /* multiple commands instead of sending one command and waiting for /* the server to respond. /* .IP "\fBpostscreen_pipelining_enable (no)\fR" /* Enable "pipelining" SMTP protocol tests in the \fBpostscreen\fR(8) /* server. /* CACHE CONTROLS /* .ad /* .fi /* .IP "\fBpostscreen_cache_cleanup_interval (12h)\fR" /* The amount of time between \fBpostscreen\fR(8) cache cleanup runs. /* .IP "\fBpostscreen_cache_map (btree:$data_directory/postscreen_cache)\fR" /* Persistent storage for the \fBpostscreen\fR(8) server decisions. /* .IP "\fBpostscreen_cache_retention_time (7d)\fR" /* The amount of time that \fBpostscreen\fR(8) will cache an expired /* temporary whitelist entry before it is removed. /* .IP "\fBpostscreen_bare_newline_ttl (30d)\fR" /* The amount of time that \fBpostscreen\fR(8) will use the result from /* a successful "bare newline" SMTP protocol test. /* .IP "\fBpostscreen_dnsbl_max_ttl (${postscreen_dnsbl_ttl?{$postscreen_dnsbl_ttl}:{1}}h)\fR" /* The maximum amount of time that \fBpostscreen\fR(8) will use the /* result from a successful DNS-based reputation test before a /* client IP address is required to pass that test again. /* .IP "\fBpostscreen_dnsbl_min_ttl (60s)\fR" /* The minimum amount of time that \fBpostscreen\fR(8) will use the /* result from a successful DNS-based reputation test before a /* client IP address is required to pass that test again. /* .IP "\fBpostscreen_greet_ttl (1d)\fR" /* The amount of time that \fBpostscreen\fR(8) will use the result from /* a successful PREGREET test. /* .IP "\fBpostscreen_non_smtp_command_ttl (30d)\fR" /* The amount of time that \fBpostscreen\fR(8) will use the result from /* a successful "non_smtp_command" SMTP protocol test. /* .IP "\fBpostscreen_pipelining_ttl (30d)\fR" /* The amount of time that \fBpostscreen\fR(8) will use the result from /* a successful "pipelining" SMTP protocol test. /* RESOURCE CONTROLS /* .ad /* .fi /* .IP "\fBline_length_limit (2048)\fR" /* Upon input, long lines are chopped up into pieces of at most /* this length; upon delivery, long lines are reconstructed. /* .IP "\fBpostscreen_client_connection_count_limit ($smtpd_client_connection_count_limit)\fR" /* How many simultaneous connections any remote SMTP client is /* allowed to have /* with the \fBpostscreen\fR(8) daemon. /* .IP "\fBpostscreen_command_count_limit (20)\fR" /* The limit on the total number of commands per SMTP session for /* \fBpostscreen\fR(8)'s built-in SMTP protocol engine. /* .IP "\fBpostscreen_command_time_limit (normal: 300s, overload: 10s)\fR" /* The time limit to read an entire command line with \fBpostscreen\fR(8)'s /* built-in SMTP protocol engine. /* .IP "\fBpostscreen_post_queue_limit ($default_process_limit)\fR" /* The number of clients that can be waiting for service from a /* real Postfix SMTP server process. /* .IP "\fBpostscreen_pre_queue_limit ($default_process_limit)\fR" /* The number of non-whitelisted clients that can be waiting for /* a decision whether they will receive service from a real Postfix /* SMTP server /* process. /* .IP "\fBpostscreen_watchdog_timeout (10s)\fR" /* How much time a \fBpostscreen\fR(8) process may take to respond to /* a remote SMTP client command or to perform a cache operation before it /* is terminated by a built-in watchdog timer. /* STARTTLS CONTROLS /* .ad /* .fi /* .IP "\fBpostscreen_tls_security_level ($smtpd_tls_security_level)\fR" /* The SMTP TLS security level for the \fBpostscreen\fR(8) server; when /* a non-empty value is specified, this overrides the obsolete parameters /* postscreen_use_tls and postscreen_enforce_tls. /* .IP "\fBtlsproxy_service_name (tlsproxy)\fR" /* The name of the \fBtlsproxy\fR(8) service entry in master.cf. /* OBSOLETE STARTTLS SUPPORT CONTROLS /* .ad /* .fi /* These parameters are supported for compatibility with /* \fBsmtpd\fR(8) legacy parameters. /* .IP "\fBpostscreen_use_tls ($smtpd_use_tls)\fR" /* Opportunistic TLS: announce STARTTLS support to remote SMTP clients, /* but do not require that clients use TLS encryption. /* .IP "\fBpostscreen_enforce_tls ($smtpd_enforce_tls)\fR" /* Mandatory TLS: announce STARTTLS support to remote SMTP clients, and /* require that clients use TLS encryption. /* 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 "\fBdelay_logging_resolution_limit (2)\fR" /* The maximal number of digits after the decimal point when logging /* sub-second delay values. /* .IP "\fBcommand_directory (see 'postconf -d' output)\fR" /* The location of all postfix administrative commands. /* .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 "\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 "\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 3.3 and later: /* .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 /* smtpd(8), Postfix SMTP server /* tlsproxy(8), Postfix TLS proxy server /* dnsblog(8), DNS black/whitelist logger /* postlogd(8), Postfix logging /* syslogd(8), system logging /* README FILES /* .ad /* .fi /* Use "\fBpostconf readme_directory\fR" or "\fBpostconf /* html_directory\fR" to locate this information. /* .nf /* .na /* POSTSCREEN_README, Postfix Postscreen Howto /* LICENSE /* .ad /* .fi /* The Secure Mailer license must be distributed with this software. /* HISTORY /* .ad /* .fi /* This service was introduced with Postfix version 2.8. /* /* Many ideas in \fBpostscreen\fR(8) were explored in earlier /* work by Michael Tokarev, in OpenBSD spamd, and in MailChannels /* Traffic Control. /* 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 #include #include /* Utility library. */ #include #include #include #include #include #include #include #include #include /* Global library. */ #include #include #include #include #include #include /* Master server protocols. */ #include /* Application-specific. */ #include /* * Configuration parameters. */ char *var_smtpd_service; char *var_smtpd_banner; bool var_disable_vrfy_cmd; bool var_helo_required; char *var_smtpd_cmd_filter; char *var_psc_cmd_filter; char *var_smtpd_forbid_cmds; char *var_psc_forbid_cmds; char *var_smtpd_ehlo_dis_words; char *var_smtpd_ehlo_dis_maps; char *var_psc_ehlo_dis_words; char *var_psc_ehlo_dis_maps; char *var_smtpd_tls_level; bool var_smtpd_use_tls; bool var_smtpd_enforce_tls; char *var_psc_tls_level; bool var_psc_use_tls; bool var_psc_enforce_tls; bool var_psc_disable_vrfy; bool var_psc_helo_required; char *var_psc_cache_map; int var_psc_cache_scan; int var_psc_cache_ret; int var_psc_post_queue_limit; int var_psc_pre_queue_limit; int var_psc_watchdog; char *var_psc_acl; char *var_psc_blist_action; char *var_psc_greet_ttl; int var_psc_greet_wait; char *var_psc_pregr_banner; char *var_psc_pregr_action; int var_psc_pregr_ttl; char *var_psc_dnsbl_sites; char *var_psc_dnsbl_reply; int var_psc_dnsbl_thresh; int var_psc_dnsbl_wthresh; char *var_psc_dnsbl_action; int var_psc_dnsbl_min_ttl; int var_psc_dnsbl_max_ttl; int var_psc_dnsbl_tmout; bool var_psc_pipel_enable; char *var_psc_pipel_action; int var_psc_pipel_ttl; bool var_psc_nsmtp_enable; char *var_psc_nsmtp_action; int var_psc_nsmtp_ttl; bool var_psc_barlf_enable; char *var_psc_barlf_action; int var_psc_barlf_ttl; int var_psc_cmd_count; int var_psc_cmd_time; char *var_dnsblog_service; char *var_tlsproxy_service; char *var_smtpd_rej_footer; char *var_psc_rej_footer; char *var_psc_rej_ftr_maps; int var_smtpd_cconn_limit; int var_psc_cconn_limit; char *var_smtpd_exp_filter; char *var_psc_exp_filter; char *var_psc_wlist_if; char *var_psc_uproxy_proto; int var_psc_uproxy_tmout; /* * Global variables. */ int psc_check_queue_length; /* connections being checked */ int psc_post_queue_length; /* being sent to real SMTPD */ DICT_CACHE *psc_cache_map; /* cache table handle */ VSTRING *psc_temp; /* scratchpad */ char *psc_smtpd_service_name; /* path to real SMTPD */ int psc_pregr_action; /* PSC_ACT_DROP/ENFORCE/etc */ int psc_dnsbl_action; /* PSC_ACT_DROP/ENFORCE/etc */ int psc_pipel_action; /* PSC_ACT_DROP/ENFORCE/etc */ int psc_nsmtp_action; /* PSC_ACT_DROP/ENFORCE/etc */ int psc_barlf_action; /* PSC_ACT_DROP/ENFORCE/etc */ int psc_min_ttl; /* Update with new tests! */ STRING_LIST *psc_forbid_cmds; /* CONNECT GET POST */ int psc_stress_greet_wait; /* stressed greet wait */ int psc_normal_greet_wait; /* stressed greet wait */ int psc_stress_cmd_time_limit; /* stressed command limit */ int psc_normal_cmd_time_limit; /* normal command time limit */ int psc_stress; /* stress level */ int psc_lowat_check_queue_length; /* stress low-water mark */ int psc_hiwat_check_queue_length; /* stress high-water mark */ DICT *psc_dnsbl_reply; /* DNSBL name mapper */ HTABLE *psc_client_concurrency; /* per-client concurrency */ /* * Local variables and functions. */ static ARGV *psc_acl; /* permanent white/backlist */ static int psc_blist_action; /* PSC_ACT_DROP/ENFORCE/etc */ static ADDR_MATCH_LIST *psc_wlist_if; /* whitelist interfaces */ static void psc_endpt_lookup_done(int, VSTREAM *, MAI_HOSTADDR_STR *, MAI_SERVPORT_STR *, MAI_HOSTADDR_STR *, MAI_SERVPORT_STR *); /* psc_dump - dump some statistics before exit */ static void psc_dump(char *unused_service, char **unused_argv) { /* * Dump preliminary cache cleanup statistics when the process commits * suicide while a cache cleanup run is in progress. We can't currently * distinguish between "postfix reload" (we should restart) or "maximal * idle time reached" (we could finish the cache cleanup first). */ if (psc_cache_map) { dict_cache_close(psc_cache_map); psc_cache_map = 0; } } /* psc_drain - delayed exit after "postfix reload" */ static void psc_drain(char *unused_service, char **unused_argv) { int count; /* * After "postfix reload", complete work-in-progress in the background, * instead of dropping already-accepted connections on the floor. * * Unfortunately we must close all writable tables, so we can't store or * look up reputation information. The reason is that we don't have any * multi-writer safety guarantees. We also can't use the single-writer * proxywrite service, because its latency guarantees are too weak. * * All error retry counts shall be limited. Instead of blocking here, we * could retry failed fork() operations in the event call-back routines, * but we don't need perfection. The host system is severely overloaded * and service levels are already way down. * * XXX Some Berkeley DB versions break with close-after-fork. Every new * version is an improvement over its predecessor. * * XXX Don't assume that it is OK to share the same LMDB lockfile descriptor * between different processes. */ if (psc_cache_map != 0 /* XXX && psc_cache_map requires locking */ ) { dict_cache_close(psc_cache_map); psc_cache_map = 0; } for (count = 0; /* see below */ ; count++) { if (count >= 5) { msg_fatal("fork: %m"); } else if (event_server_drain() != 0) { msg_warn("fork: %m"); sleep(1); continue; } else { return; } } } /* psc_service - handle new client connection */ static void psc_service(VSTREAM *smtp_client_stream, char *unused_service, char **unused_argv) { /* * For sanity, require that at least one of INET or INET6 is enabled. * Otherwise, we can't look up interface information, and we can't * convert names or addresses. */ if (inet_proto_info()->ai_family_list[0] == 0) msg_fatal("all network protocols are disabled (%s = %s)", VAR_INET_PROTOCOLS, var_inet_protocols); /* * This program handles all incoming connections, so it must not block. * We use event-driven code for all operations that introduce latency. * * Note: instead of using VSTREAM-level timeouts, we enforce limits on the * total amount of time to receive a complete SMTP command line. */ non_blocking(vstream_fileno(smtp_client_stream), NON_BLOCKING); /* * Look up the remote SMTP client address and port. */ psc_endpt_lookup(smtp_client_stream, psc_endpt_lookup_done); } /* psc_endpt_lookup_done - endpoint lookup completed */ static void psc_endpt_lookup_done(int endpt_status, VSTREAM *smtp_client_stream, MAI_HOSTADDR_STR *smtp_client_addr, MAI_SERVPORT_STR *smtp_client_port, MAI_HOSTADDR_STR *smtp_server_addr, MAI_SERVPORT_STR *smtp_server_port) { const char *myname = "psc_endpt_lookup_done"; PSC_STATE *state; const char *stamp_str; int saved_flags; /* * Best effort - if this non-blocking write(2) fails, so be it. */ if (endpt_status < 0) { (void) write(vstream_fileno(smtp_client_stream), "421 4.3.2 No system resources\r\n", sizeof("421 4.3.2 No system resources\r\n") - 1); event_server_disconnect(smtp_client_stream); return; } if (msg_verbose > 1) msg_info("%s: sq=%d cq=%d connect from [%s]:%s", myname, psc_post_queue_length, psc_check_queue_length, smtp_client_addr->buf, smtp_client_port->buf); msg_info("CONNECT from [%s]:%s to [%s]:%s", smtp_client_addr->buf, smtp_client_port->buf, smtp_server_addr->buf, smtp_server_port->buf); /* * Bundle up all the loose session pieces. This zeroes all flags and time * stamps. */ state = psc_new_session_state(smtp_client_stream, smtp_client_addr->buf, smtp_client_port->buf, smtp_server_addr->buf, smtp_server_port->buf); /* * Reply with 421 when the client has too many open connections. */ if (var_psc_cconn_limit > 0 && state->client_info->concurrency > var_psc_cconn_limit) { msg_info("NOQUEUE: reject: CONNECT from [%s]:%s: too many connections", state->smtp_client_addr, state->smtp_client_port); PSC_DROP_SESSION_STATE(state, "421 4.7.0 Error: too many connections\r\n"); return; } /* * Reply with 421 when we can't forward more connections. */ if (var_psc_post_queue_limit > 0 && psc_post_queue_length >= var_psc_post_queue_limit) { msg_info("NOQUEUE: reject: CONNECT from [%s]:%s: all server ports busy", state->smtp_client_addr, state->smtp_client_port); PSC_DROP_SESSION_STATE(state, "421 4.3.2 All server ports are busy\r\n"); return; } /* * The permanent white/blacklist has highest precedence. */ if (psc_acl != 0) { switch (psc_acl_eval(state, psc_acl, VAR_PSC_ACL)) { /* * Permanently blacklisted. */ case PSC_ACL_ACT_BLACKLIST: msg_info("BLACKLISTED [%s]:%s", PSC_CLIENT_ADDR_PORT(state)); PSC_FAIL_SESSION_STATE(state, PSC_STATE_FLAG_BLIST_FAIL); switch (psc_blist_action) { case PSC_ACT_DROP: PSC_DROP_SESSION_STATE(state, "521 5.3.2 Service currently unavailable\r\n"); return; case PSC_ACT_ENFORCE: PSC_ENFORCE_SESSION_STATE(state, "550 5.3.2 Service currently unavailable\r\n"); break; case PSC_ACT_IGNORE: PSC_UNFAIL_SESSION_STATE(state, PSC_STATE_FLAG_BLIST_FAIL); /* * Not: PSC_PASS_SESSION_STATE. Repeat this test the next * time. */ break; default: msg_panic("%s: unknown blacklist action value %d", myname, psc_blist_action); } break; /* * Permanently whitelisted. */ case PSC_ACL_ACT_WHITELIST: msg_info("WHITELISTED [%s]:%s", PSC_CLIENT_ADDR_PORT(state)); psc_conclude(state); return; /* * Other: dunno (don't know) or error. */ default: break; } } /* * The temporary whitelist (i.e. the postscreen cache) has the lowest * precedence. This cache contains information about the results of prior * tests. Whitelist the client when all enabled test results are still * valid. */ if ((state->flags & PSC_STATE_MASK_ANY_FAIL) == 0 && state->client_info->concurrency == 1 && psc_cache_map != 0 && (stamp_str = psc_cache_lookup(psc_cache_map, state->smtp_client_addr)) != 0) { saved_flags = state->flags; psc_parse_tests(state, stamp_str, event_time()); state->flags |= saved_flags; if (msg_verbose) msg_info("%s: cached + recent flags: %s", myname, psc_print_state_flags(state->flags, myname)); if ((state->flags & PSC_STATE_MASK_ANY_TODO_FAIL) == 0) { msg_info("PASS OLD [%s]:%s", PSC_CLIENT_ADDR_PORT(state)); psc_conclude(state); return; } } else if (state->client_info->concurrency > 1) { saved_flags = state->flags; psc_todo_tests(state, event_time()); state->flags |= saved_flags; if (msg_verbose) msg_info("%s: new + recent flags: %s", myname, psc_print_state_flags(state->flags, myname)); } else { saved_flags = state->flags; psc_new_tests(state); state->flags |= saved_flags; if (msg_verbose) msg_info("%s: new + recent flags: %s", myname, psc_print_state_flags(state->flags, myname)); } /* * Don't whitelist clients that connect to backup MX addresses. Fail * "closed" on error. */ if (addr_match_list_match(psc_wlist_if, smtp_server_addr->buf) == 0) { state->flags |= (PSC_STATE_FLAG_WLIST_FAIL | PSC_STATE_FLAG_NOFORWARD); msg_info("WHITELIST VETO [%s]:%s", PSC_CLIENT_ADDR_PORT(state)); } /* * Reply with 421 when we can't analyze more connections. That also means * no deep protocol tests when the noforward flag is raised. */ if (var_psc_pre_queue_limit > 0 && psc_check_queue_length - psc_post_queue_length >= var_psc_pre_queue_limit) { msg_info("reject: connect from [%s]:%s: all screening ports busy", state->smtp_client_addr, state->smtp_client_port); PSC_DROP_SESSION_STATE(state, "421 4.3.2 All screening ports are busy\r\n"); return; } /* * If the client has no up-to-date results for some tests, do those tests * first. Otherwise, skip the tests and hand off the connection. */ if (state->flags & PSC_STATE_MASK_EARLY_TODO) psc_early_tests(state); else if (state->flags & (PSC_STATE_MASK_SMTPD_TODO | PSC_STATE_FLAG_NOFORWARD)) psc_smtpd_tests(state); else psc_conclude(state); } /* psc_cache_validator - validate one cache entry */ static int psc_cache_validator(const char *client_addr, const char *stamp_str, void *unused_context) { PSC_STATE dummy_state; PSC_CLIENT_INFO dummy_client_info; /* * This function is called by the cache cleanup pseudo thread. * * When an entry is removed from the cache, the client will be reported as * "NEW" in the next session where it passes all tests again. To avoid * silly logging we remove the cache entry only after all tests have * expired longer ago than the cache retention time. */ dummy_state.client_info = &dummy_client_info; psc_parse_tests(&dummy_state, stamp_str, event_time() - var_psc_cache_ret); return ((dummy_state.flags & PSC_STATE_MASK_ANY_TODO) == 0); } /* pre_jail_init - pre-jail initialization */ static void pre_jail_init(char *unused_name, char **unused_argv) { VSTRING *redirect; /* * Open read-only maps before dropping privilege, for consistency with * other Postfix daemons. */ psc_acl_pre_jail_init(var_mynetworks, VAR_PSC_ACL); if (*var_psc_acl) psc_acl = psc_acl_parse(var_psc_acl, VAR_PSC_ACL); /* Ignore smtpd_forbid_cmds lookup errors. Non-critical feature. */ if (*var_psc_forbid_cmds) psc_forbid_cmds = string_list_init(VAR_PSC_FORBID_CMDS, MATCH_FLAG_RETURN, var_psc_forbid_cmds); if (*var_psc_dnsbl_reply) psc_dnsbl_reply = dict_open(var_psc_dnsbl_reply, O_RDONLY, DICT_FLAG_DUP_WARN); /* * Never, ever, get killed by a master signal, as that would corrupt the * database when we're in the middle of an update. */ if (setsid() < 0) msg_warn("setsid: %m"); /* * Security: don't create root-owned files that contain untrusted data. * And don't create Postfix-owned files in root-owned directories, * either. We want a correct relationship between (file or directory) * ownership and (file or directory) content. To open files before going * to jail, temporarily drop root privileges. */ SAVE_AND_SET_EUGID(var_owner_uid, var_owner_gid); redirect = vstring_alloc(100); /* * Keep state in persistent external map. As a safety measure we sync the * database on each update. This hurts on LINUX file systems that sync * all dirty disk blocks whenever any application invokes fsync(). * * Start the cache maintenance pseudo thread after dropping privileges. */ #define PSC_DICT_OPEN_FLAGS (DICT_FLAG_DUP_REPLACE | DICT_FLAG_SYNC_UPDATE | \ DICT_FLAG_OPEN_LOCK) if (*var_psc_cache_map) psc_cache_map = dict_cache_open(data_redirect_map(redirect, var_psc_cache_map), O_CREAT | O_RDWR, PSC_DICT_OPEN_FLAGS); /* * Clean up and restore privilege. */ vstring_free(redirect); RESTORE_SAVED_EUGID(); /* * Initialize the dummy SMTP engine. */ psc_smtpd_pre_jail_init(); } /* pre_accept - see if tables have changed */ static void pre_accept(char *unused_name, char **unused_argv) { static time_t last_event_time; time_t new_event_time; const char *name; /* * If some table has changed then stop accepting new connections. Don't * check the tables more than once a second. */ new_event_time = event_time(); if (new_event_time >= last_event_time + 1 && (name = dict_changed_name()) != 0) { msg_info("table %s has changed - finishing in the background", name); event_server_drain(); } else { last_event_time = new_event_time; } } /* post_jail_init - post-jail initialization */ static void post_jail_init(char *unused_name, char **unused_argv) { const NAME_CODE actions[] = { PSC_NAME_ACT_DROP, PSC_ACT_DROP, PSC_NAME_ACT_ENFORCE, PSC_ACT_ENFORCE, PSC_NAME_ACT_IGNORE, PSC_ACT_IGNORE, PSC_NAME_ACT_CONT, PSC_ACT_IGNORE, /* compatibility */ 0, -1, }; int cache_flags; const char *tmp; /* * This routine runs after the skeleton code has entered the chroot jail. * Prevent automatic process suicide after a limited number of client * requests. It is OK to terminate after a limited amount of idle time. */ var_use_limit = 0; /* * Workaround for parameters whose values may contain "$", and that have * a default of "$parametername". Not sure if it would be a good idea to * always to this in the mail_conf_raw(3) module. */ if (*var_psc_rej_footer == '$' && mail_conf_lookup(var_psc_rej_footer + 1)) { tmp = mail_conf_eval_once(var_psc_rej_footer); myfree(var_psc_rej_footer); var_psc_rej_footer = mystrdup(tmp); } if (*var_psc_exp_filter == '$' && mail_conf_lookup(var_psc_exp_filter + 1)) { tmp = mail_conf_eval_once(var_psc_exp_filter); myfree(var_psc_exp_filter); var_psc_exp_filter = mystrdup(tmp); } /* * Other one-time initialization. */ psc_temp = vstring_alloc(10); vstring_sprintf(psc_temp, "%s/%s", MAIL_CLASS_PRIVATE, var_smtpd_service); psc_smtpd_service_name = mystrdup(STR(psc_temp)); psc_dnsbl_init(); psc_early_init(); psc_smtpd_init(); if ((psc_blist_action = name_code(actions, NAME_CODE_FLAG_NONE, var_psc_blist_action)) < 0) msg_fatal("bad %s value: %s", VAR_PSC_BLIST_ACTION, var_psc_blist_action); if ((psc_dnsbl_action = name_code(actions, NAME_CODE_FLAG_NONE, var_psc_dnsbl_action)) < 0) msg_fatal("bad %s value: %s", VAR_PSC_DNSBL_ACTION, var_psc_dnsbl_action); if ((psc_pregr_action = name_code(actions, NAME_CODE_FLAG_NONE, var_psc_pregr_action)) < 0) msg_fatal("bad %s value: %s", VAR_PSC_PREGR_ACTION, var_psc_pregr_action); if ((psc_pipel_action = name_code(actions, NAME_CODE_FLAG_NONE, var_psc_pipel_action)) < 0) msg_fatal("bad %s value: %s", VAR_PSC_PIPEL_ACTION, var_psc_pipel_action); if ((psc_nsmtp_action = name_code(actions, NAME_CODE_FLAG_NONE, var_psc_nsmtp_action)) < 0) msg_fatal("bad %s value: %s", VAR_PSC_NSMTP_ACTION, var_psc_nsmtp_action); if ((psc_barlf_action = name_code(actions, NAME_CODE_FLAG_NONE, var_psc_barlf_action)) < 0) msg_fatal("bad %s value: %s", VAR_PSC_BARLF_ACTION, var_psc_barlf_action); /* Fail "closed" on error. */ psc_wlist_if = addr_match_list_init(VAR_PSC_WLIST_IF, MATCH_FLAG_RETURN, var_psc_wlist_if); /* * Start the cache maintenance pseudo thread last. Early cleanup makes * verbose logging more informative (we get positive confirmation that * the cleanup thread runs). */ cache_flags = DICT_CACHE_FLAG_STATISTICS; if (msg_verbose > 1) cache_flags |= DICT_CACHE_FLAG_VERBOSE; if (psc_cache_map != 0 && var_psc_cache_scan > 0) dict_cache_control(psc_cache_map, CA_DICT_CACHE_CTL_FLAGS(cache_flags), CA_DICT_CACHE_CTL_INTERVAL(var_psc_cache_scan), CA_DICT_CACHE_CTL_VALIDATOR(psc_cache_validator), CA_DICT_CACHE_CTL_CONTEXT((void *) 0), CA_DICT_CACHE_CTL_END); /* * Pre-compute the minimal and maximal TTL. */ psc_min_ttl = PSC_MIN(PSC_MIN(var_psc_pregr_ttl, var_psc_dnsbl_min_ttl), PSC_MIN(PSC_MIN(var_psc_pipel_ttl, var_psc_nsmtp_ttl), var_psc_barlf_ttl)); /* * Pre-compute the stress and normal command time limits. */ mail_conf_update(VAR_STRESS, "yes"); psc_stress_cmd_time_limit = get_mail_conf_time(VAR_PSC_CMD_TIME, DEF_PSC_CMD_TIME, 1, 0); psc_stress_greet_wait = get_mail_conf_time(VAR_PSC_GREET_WAIT, DEF_PSC_GREET_WAIT, 1, 0); mail_conf_update(VAR_STRESS, ""); psc_normal_cmd_time_limit = get_mail_conf_time(VAR_PSC_CMD_TIME, DEF_PSC_CMD_TIME, 1, 0); psc_normal_greet_wait = get_mail_conf_time(VAR_PSC_GREET_WAIT, DEF_PSC_GREET_WAIT, 1, 0); psc_lowat_check_queue_length = .7 * var_psc_pre_queue_limit; psc_hiwat_check_queue_length = .9 * var_psc_pre_queue_limit; if (msg_verbose) msg_info(VAR_PSC_CMD_TIME ": stress=%d normal=%d lowat=%d hiwat=%d", psc_stress_cmd_time_limit, psc_normal_cmd_time_limit, psc_lowat_check_queue_length, psc_hiwat_check_queue_length); if (psc_lowat_check_queue_length == 0) msg_panic("compiler error: 0.7 * %d = %d", var_psc_pre_queue_limit, psc_lowat_check_queue_length); if (psc_hiwat_check_queue_length == 0) msg_panic("compiler error: 0.9 * %d = %d", var_psc_pre_queue_limit, psc_hiwat_check_queue_length); /* * Per-client concurrency. */ psc_client_concurrency = htable_create(var_psc_pre_queue_limit); } MAIL_VERSION_STAMP_DECLARE; /* main - pass control to the multi-threaded skeleton */ int main(int argc, char **argv) { /* * List smtpd(8) parameters before any postscreen(8) parameters that have * defaults dependencies on them. */ static const CONFIG_STR_TABLE str_table[] = { VAR_SMTPD_SERVICE, DEF_SMTPD_SERVICE, &var_smtpd_service, 1, 0, VAR_SMTPD_BANNER, DEF_SMTPD_BANNER, &var_smtpd_banner, 1, 0, VAR_SMTPD_FORBID_CMDS, DEF_SMTPD_FORBID_CMDS, &var_smtpd_forbid_cmds, 0, 0, VAR_SMTPD_EHLO_DIS_WORDS, DEF_SMTPD_EHLO_DIS_WORDS, &var_smtpd_ehlo_dis_words, 0, 0, VAR_SMTPD_EHLO_DIS_MAPS, DEF_SMTPD_EHLO_DIS_MAPS, &var_smtpd_ehlo_dis_maps, 0, 0, VAR_SMTPD_TLS_LEVEL, DEF_SMTPD_TLS_LEVEL, &var_smtpd_tls_level, 0, 0, VAR_SMTPD_CMD_FILTER, DEF_SMTPD_CMD_FILTER, &var_smtpd_cmd_filter, 0, 0, VAR_PSC_CACHE_MAP, DEF_PSC_CACHE_MAP, &var_psc_cache_map, 0, 0, VAR_PSC_PREGR_BANNER, DEF_PSC_PREGR_BANNER, &var_psc_pregr_banner, 0, 0, VAR_PSC_PREGR_ACTION, DEF_PSC_PREGR_ACTION, &var_psc_pregr_action, 1, 0, VAR_PSC_DNSBL_SITES, DEF_PSC_DNSBL_SITES, &var_psc_dnsbl_sites, 0, 0, VAR_PSC_DNSBL_ACTION, DEF_PSC_DNSBL_ACTION, &var_psc_dnsbl_action, 1, 0, VAR_PSC_PIPEL_ACTION, DEF_PSC_PIPEL_ACTION, &var_psc_pipel_action, 1, 0, VAR_PSC_NSMTP_ACTION, DEF_PSC_NSMTP_ACTION, &var_psc_nsmtp_action, 1, 0, VAR_PSC_BARLF_ACTION, DEF_PSC_BARLF_ACTION, &var_psc_barlf_action, 1, 0, VAR_PSC_ACL, DEF_PSC_ACL, &var_psc_acl, 0, 0, VAR_PSC_BLIST_ACTION, DEF_PSC_BLIST_ACTION, &var_psc_blist_action, 1, 0, VAR_PSC_FORBID_CMDS, DEF_PSC_FORBID_CMDS, &var_psc_forbid_cmds, 0, 0, VAR_PSC_EHLO_DIS_WORDS, DEF_PSC_EHLO_DIS_WORDS, &var_psc_ehlo_dis_words, 0, 0, VAR_PSC_EHLO_DIS_MAPS, DEF_PSC_EHLO_DIS_MAPS, &var_psc_ehlo_dis_maps, 0, 0, VAR_PSC_DNSBL_REPLY, DEF_PSC_DNSBL_REPLY, &var_psc_dnsbl_reply, 0, 0, VAR_PSC_TLS_LEVEL, DEF_PSC_TLS_LEVEL, &var_psc_tls_level, 0, 0, VAR_PSC_CMD_FILTER, DEF_PSC_CMD_FILTER, &var_psc_cmd_filter, 0, 0, VAR_DNSBLOG_SERVICE, DEF_DNSBLOG_SERVICE, &var_dnsblog_service, 1, 0, VAR_TLSPROXY_SERVICE, DEF_TLSPROXY_SERVICE, &var_tlsproxy_service, 1, 0, VAR_PSC_WLIST_IF, DEF_PSC_WLIST_IF, &var_psc_wlist_if, 0, 0, VAR_PSC_UPROXY_PROTO, DEF_PSC_UPROXY_PROTO, &var_psc_uproxy_proto, 0, 0, VAR_PSC_REJ_FTR_MAPS, DEF_PSC_REJ_FTR_MAPS, &var_psc_rej_ftr_maps, 0, 0, 0, }; static const CONFIG_INT_TABLE int_table[] = { VAR_PSC_DNSBL_THRESH, DEF_PSC_DNSBL_THRESH, &var_psc_dnsbl_thresh, 1, 0, VAR_PSC_DNSBL_WTHRESH, DEF_PSC_DNSBL_WTHRESH, &var_psc_dnsbl_wthresh, 0, 0, VAR_PSC_CMD_COUNT, DEF_PSC_CMD_COUNT, &var_psc_cmd_count, 1, 0, VAR_SMTPD_CCONN_LIMIT, DEF_SMTPD_CCONN_LIMIT, &var_smtpd_cconn_limit, 0, 0, 0, }; static const CONFIG_NINT_TABLE nint_table[] = { VAR_PSC_POST_QLIMIT, DEF_PSC_POST_QLIMIT, &var_psc_post_queue_limit, 5, 0, VAR_PSC_PRE_QLIMIT, DEF_PSC_PRE_QLIMIT, &var_psc_pre_queue_limit, 10, 0, VAR_PSC_CCONN_LIMIT, DEF_PSC_CCONN_LIMIT, &var_psc_cconn_limit, 0, 0, 0, }; static const CONFIG_TIME_TABLE time_table[] = { VAR_PSC_CMD_TIME, DEF_PSC_CMD_TIME, &var_psc_cmd_time, 1, 0, VAR_PSC_GREET_WAIT, DEF_PSC_GREET_WAIT, &var_psc_greet_wait, 1, 0, VAR_PSC_PREGR_TTL, DEF_PSC_PREGR_TTL, &var_psc_pregr_ttl, 1, 0, VAR_PSC_DNSBL_MIN_TTL, DEF_PSC_DNSBL_MIN_TTL, &var_psc_dnsbl_min_ttl, 1, 0, VAR_PSC_DNSBL_MAX_TTL, DEF_PSC_DNSBL_MAX_TTL, &var_psc_dnsbl_max_ttl, 1, 0, VAR_PSC_PIPEL_TTL, DEF_PSC_PIPEL_TTL, &var_psc_pipel_ttl, 1, 0, VAR_PSC_NSMTP_TTL, DEF_PSC_NSMTP_TTL, &var_psc_nsmtp_ttl, 1, 0, VAR_PSC_BARLF_TTL, DEF_PSC_BARLF_TTL, &var_psc_barlf_ttl, 1, 0, VAR_PSC_CACHE_RET, DEF_PSC_CACHE_RET, &var_psc_cache_ret, 1, 0, VAR_PSC_CACHE_SCAN, DEF_PSC_CACHE_SCAN, &var_psc_cache_scan, 0, 0, VAR_PSC_WATCHDOG, DEF_PSC_WATCHDOG, &var_psc_watchdog, 10, 0, VAR_PSC_UPROXY_TMOUT, DEF_PSC_UPROXY_TMOUT, &var_psc_uproxy_tmout, 1, 0, VAR_PSC_DNSBL_TMOUT, DEF_PSC_DNSBL_TMOUT, &var_psc_dnsbl_tmout, 1, 0, 0, }; static const CONFIG_BOOL_TABLE bool_table[] = { VAR_HELO_REQUIRED, DEF_HELO_REQUIRED, &var_helo_required, VAR_DISABLE_VRFY_CMD, DEF_DISABLE_VRFY_CMD, &var_disable_vrfy_cmd, VAR_SMTPD_USE_TLS, DEF_SMTPD_USE_TLS, &var_smtpd_use_tls, VAR_SMTPD_ENFORCE_TLS, DEF_SMTPD_ENFORCE_TLS, &var_smtpd_enforce_tls, VAR_PSC_PIPEL_ENABLE, DEF_PSC_PIPEL_ENABLE, &var_psc_pipel_enable, VAR_PSC_NSMTP_ENABLE, DEF_PSC_NSMTP_ENABLE, &var_psc_nsmtp_enable, VAR_PSC_BARLF_ENABLE, DEF_PSC_BARLF_ENABLE, &var_psc_barlf_enable, 0, }; static const CONFIG_RAW_TABLE raw_table[] = { VAR_SMTPD_REJ_FOOTER, DEF_SMTPD_REJ_FOOTER, &var_smtpd_rej_footer, 0, 0, VAR_PSC_REJ_FOOTER, DEF_PSC_REJ_FOOTER, &var_psc_rej_footer, 0, 0, VAR_SMTPD_EXP_FILTER, DEF_SMTPD_EXP_FILTER, &var_smtpd_exp_filter, 1, 0, VAR_PSC_EXP_FILTER, DEF_PSC_EXP_FILTER, &var_psc_exp_filter, 1, 0, 0, }; static const CONFIG_NBOOL_TABLE nbool_table[] = { VAR_PSC_HELO_REQUIRED, DEF_PSC_HELO_REQUIRED, &var_psc_helo_required, VAR_PSC_DISABLE_VRFY, DEF_PSC_DISABLE_VRFY, &var_psc_disable_vrfy, VAR_PSC_USE_TLS, DEF_PSC_USE_TLS, &var_psc_use_tls, VAR_PSC_ENFORCE_TLS, DEF_PSC_ENFORCE_TLS, &var_psc_enforce_tls, 0, }; /* * Fingerprint executables and core dumps. */ MAIL_VERSION_STAMP_ALLOCATE; event_server_main(argc, argv, psc_service, CA_MAIL_SERVER_STR_TABLE(str_table), CA_MAIL_SERVER_INT_TABLE(int_table), CA_MAIL_SERVER_NINT_TABLE(nint_table), CA_MAIL_SERVER_TIME_TABLE(time_table), CA_MAIL_SERVER_BOOL_TABLE(bool_table), CA_MAIL_SERVER_RAW_TABLE(raw_table), CA_MAIL_SERVER_NBOOL_TABLE(nbool_table), CA_MAIL_SERVER_PRE_INIT(pre_jail_init), CA_MAIL_SERVER_POST_INIT(post_jail_init), CA_MAIL_SERVER_PRE_ACCEPT(pre_accept), CA_MAIL_SERVER_SOLITARY, CA_MAIL_SERVER_SLOW_EXIT(psc_drain), CA_MAIL_SERVER_EXIT(psc_dump), CA_MAIL_SERVER_WATCHDOG(&var_psc_watchdog), 0); }