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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:46:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:46:30 +0000
commitb5896ba9f6047e7031e2bdee0622d543e11a6734 (patch)
treefd7b460593a2fee1be579bec5697e6d887ea3421 /src/smtpd/smtpd_check.c
parentInitial commit. (diff)
downloadpostfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.tar.xz
postfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.zip
Adding upstream version 3.4.23.upstream/3.4.23upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--src/smtpd/smtpd_check.c6289
1 files changed, 6289 insertions, 0 deletions
diff --git a/src/smtpd/smtpd_check.c b/src/smtpd/smtpd_check.c
new file mode 100644
index 0000000..31ed00f
--- /dev/null
+++ b/src/smtpd/smtpd_check.c
@@ -0,0 +1,6289 @@
+/*++
+/* NAME
+/* smtpd_check 3
+/* SUMMARY
+/* SMTP client request filtering
+/* SYNOPSIS
+/* #include "smtpd.h"
+/* #include "smtpd_check.h"
+/*
+/* void smtpd_check_init()
+/*
+/* int smtpd_check_addr(sender, address, smtputf8)
+/* const char *sender;
+/* const char *address;
+/* int smtputf8;
+/*
+/* char *smtpd_check_rewrite(state)
+/* SMTPD_STATE *state;
+/*
+/* char *smtpd_check_client(state)
+/* SMTPD_STATE *state;
+/*
+/* char *smtpd_check_helo(state, helohost)
+/* SMTPD_STATE *state;
+/* char *helohost;
+/*
+/* char *smtpd_check_mail(state, sender)
+/* SMTPD_STATE *state;
+/* char *sender;
+/*
+/* char *smtpd_check_rcpt(state, recipient)
+/* SMTPD_STATE *state;
+/* char *recipient;
+/*
+/* char *smtpd_check_etrn(state, destination)
+/* SMTPD_STATE *state;
+/* char *destination;
+/*
+/* char *smtpd_check_data(state)
+/* SMTPD_STATE *state;
+/*
+/* char *smtpd_check_eod(state)
+/* SMTPD_STATE *state;
+/*
+/* char *smtpd_check_size(state, size)
+/* SMTPD_STATE *state;
+/* off_t size;
+/*
+/* char *smtpd_check_queue(state)
+/* SMTPD_STATE *state;
+/* DESCRIPTION
+/* This module implements additional checks on SMTP client requests.
+/* A client request is validated in the context of the session state.
+/* The result is either an error response (including the numerical
+/* code) or the result is a null pointer in case of success.
+/*
+/* smtpd_check_init() initializes. This function should be called
+/* once during the process life time.
+/*
+/* smtpd_check_addr() sanity checks an email address and returns
+/* non-zero in case of badness. The sender argument provides sender
+/* context for address resolution and caching, or a null pointer
+/* if information is unavailable.
+/*
+/* smtpd_check_rewrite() should be called before opening a queue
+/* file or proxy connection, in order to establish the proper
+/* header address rewriting context.
+/*
+/* Each of the following routines scrutinizes the argument passed to
+/* an SMTP command such as HELO, MAIL FROM, RCPT TO, or scrutinizes
+/* the initial client connection request. The administrator can
+/* specify what restrictions apply.
+/*
+/* Restrictions are specified via configuration parameters named
+/* \fIsmtpd_{client,helo,sender,recipient}_restrictions.\fR Each
+/* configuration parameter specifies a list of zero or more
+/* restrictions that are applied in the order as specified.
+/* .PP
+/* smtpd_check_client() validates the client host name or address.
+/* Relevant configuration parameters:
+/* .IP smtpd_client_restrictions
+/* Restrictions on the names or addresses of clients that may connect
+/* to this SMTP server.
+/* .PP
+/* smtpd_check_helo() validates the hostname provided with the
+/* HELO/EHLO commands. Relevant configuration parameters:
+/* .IP smtpd_helo_restrictions
+/* Restrictions on the hostname that is sent with the HELO/EHLO
+/* command.
+/* .PP
+/* smtpd_check_mail() validates the sender address provided with
+/* a MAIL FROM request. Relevant configuration parameters:
+/* .IP smtpd_sender_restrictions
+/* Restrictions on the sender address that is sent with the MAIL FROM
+/* command.
+/* .PP
+/* smtpd_check_rcpt() validates the recipient address provided
+/* with an RCPT TO request. Relevant configuration parameters:
+/* .IP smtpd_recipient_restrictions
+/* Restrictions on the recipient address that is sent with the RCPT
+/* TO command.
+/* .IP local_recipient_maps
+/* Tables of user names (not addresses) that exist in $mydestination.
+/* Mail for local users not in these tables is rejected.
+/* .PP
+/* smtpd_check_etrn() validates the domain name provided with the
+/* ETRN command, and other client-provided information. Relevant
+/* configuration parameters:
+/* .IP smtpd_etrn_restrictions
+/* Restrictions on the hostname that is sent with the HELO/EHLO
+/* command.
+/* .PP
+/* smtpd_check_size() checks if a message with the given size can
+/* be received (zero means that the message size is unknown). The
+/* message is rejected when
+/* the message size exceeds the non-zero bound specified with the
+/* \fImessage_size_limit\fR configuration parameter. This is a
+/* permanent error.
+/*
+/* smtpd_check_queue() checks the available queue file system
+/* space. The message is rejected when:
+/* .IP \(bu
+/* The available queue file system space is less than the amount
+/* specified with the \fImin_queue_free\fR configuration parameter.
+/* This is a temporary error.
+/* .IP \(bu
+/* The available queue file system space is less than twice the
+/* message size limit. This is a temporary error.
+/* .PP
+/* smtpd_check_data() enforces generic restrictions after the
+/* client has sent the DATA command.
+/*
+/* smtpd_check_eod() enforces generic restrictions after the
+/* client has sent the END-OF-DATA command.
+/*
+/* Arguments:
+/* .IP name
+/* The client hostname, or \fIunknown\fR.
+/* .IP addr
+/* The client address.
+/* .IP helohost
+/* The hostname given with the HELO command.
+/* .IP sender
+/* The sender address given with the MAIL FROM command.
+/* .IP recipient
+/* The recipient address given with the RCPT TO or VRFY command.
+/* .IP size
+/* The message size given with the MAIL FROM command (zero if unknown).
+/* BUGS
+/* Policies like these should not be hard-coded in C, but should
+/* be user-programmable instead.
+/* SEE ALSO
+/* namadr_list(3) host access control
+/* domain_list(3) domain access control
+/* fsspace(3) free file system space
+/* LICENSE
+/* .ad
+/* .fi
+/* The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/* Wietse Venema
+/* IBM T.J. Watson Research
+/* P.O. Box 704
+/* Yorktown Heights, NY 10598, USA
+/*
+/* Wietse Venema
+/* Google, Inc.
+/* 111 8th Avenue
+/* New York, NY 10011, USA
+/*
+/* TLS support originally by:
+/* Lutz Jaenicke
+/* BTU Cottbus
+/* Allgemeine Elektrotechnik
+/* Universitaetsplatz 3-4
+/* D-03044 Cottbus, Germany
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <string.h>
+#include <ctype.h>
+#include <stdarg.h>
+#include <netdb.h>
+#include <setjmp.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+
+#ifdef STRCASECMP_IN_STRINGS_H
+#include <strings.h>
+#endif
+
+/* Utility library. */
+
+#include <msg.h>
+#include <vstring.h>
+#include <split_at.h>
+#include <fsspace.h>
+#include <stringops.h>
+#include <valid_hostname.h>
+#include <argv.h>
+#include <mymalloc.h>
+#include <dict.h>
+#include <htable.h>
+#include <ctable.h>
+#include <mac_expand.h>
+#include <attr_clnt.h>
+#include <myaddrinfo.h>
+#include <inet_proto.h>
+#include <ip_match.h>
+#include <valid_utf8_hostname.h>
+#include <midna_domain.h>
+#include <mynetworks.h>
+
+/* DNS library. */
+
+#include <dns.h>
+
+/* Global library. */
+
+#include <string_list.h>
+#include <namadr_list.h>
+#include <domain_list.h>
+#include <mail_params.h>
+#include <resolve_clnt.h>
+#include <mail_error.h>
+#include <resolve_local.h>
+#include <own_inet_addr.h>
+#include <mail_conf.h>
+#include <maps.h>
+#include <mail_addr_find.h>
+#include <match_parent_style.h>
+#include <strip_addr.h>
+#include <cleanup_user.h>
+#include <record.h>
+#include <rec_type.h>
+#include <mail_proto.h>
+#include <mail_addr.h>
+#include <verify_clnt.h>
+#include <input_transp.h>
+#include <is_header.h>
+#include <valid_mailhost_addr.h>
+#include <dsn_util.h>
+#include <conv_time.h>
+#include <xtext.h>
+#include <smtp_stream.h>
+#include <attr_override.h>
+
+/* Application-specific. */
+
+#include "smtpd.h"
+#include "smtpd_sasl_glue.h"
+#include "smtpd_check.h"
+#include "smtpd_dsn_fix.h"
+#include "smtpd_resolve.h"
+#include "smtpd_expand.h"
+
+ /*
+ * Eject seat in case of parsing problems.
+ */
+static jmp_buf smtpd_check_buf;
+
+ /*
+ * Results of restrictions. Errors are negative; see dict.h.
+ */
+#define SMTPD_CHECK_DUNNO 0 /* indifferent */
+#define SMTPD_CHECK_OK 1 /* explicitly permit */
+#define SMTPD_CHECK_REJECT 2 /* explicitly reject */
+
+ /*
+ * Intermediate results. These are static to avoid unnecessary stress on the
+ * memory manager routines.
+ */
+static VSTRING *error_text;
+static CTABLE *smtpd_rbl_cache;
+static CTABLE *smtpd_rbl_byte_cache;
+
+ /*
+ * Pre-opened SMTP recipient maps so we can reject mail for unknown users.
+ * XXX This does not belong here and will eventually become part of the
+ * trivial-rewrite resolver.
+ */
+static MAPS *local_rcpt_maps;
+static MAPS *send_canon_maps;
+static MAPS *rcpt_canon_maps;
+static MAPS *canonical_maps;
+static MAPS *virt_alias_maps;
+static MAPS *virt_mailbox_maps;
+static MAPS *relay_rcpt_maps;
+
+#ifdef TEST
+
+static STRING_LIST *virt_alias_doms;
+static STRING_LIST *virt_mailbox_doms;
+
+#endif
+
+ /*
+ * Response templates for various rbl domains.
+ */
+static MAPS *rbl_reply_maps;
+
+ /*
+ * Pre-opened sender to login name mapping.
+ */
+static MAPS *smtpd_sender_login_maps;
+
+ /*
+ * Pre-opened access control lists.
+ */
+static DOMAIN_LIST *relay_domains;
+static NAMADR_LIST *mynetworks_curr;
+static NAMADR_LIST *mynetworks_new;
+static NAMADR_LIST *perm_mx_networks;
+
+#ifdef USE_TLS
+static MAPS *relay_ccerts;
+
+#endif
+
+ /*
+ * How to do parent domain wildcard matching, if any.
+ */
+static int access_parent_style;
+
+ /*
+ * Pre-parsed restriction lists.
+ */
+static ARGV *client_restrctions;
+static ARGV *helo_restrctions;
+static ARGV *mail_restrctions;
+static ARGV *relay_restrctions;
+static ARGV *fake_relay_restrctions;
+static ARGV *rcpt_restrctions;
+static ARGV *etrn_restrctions;
+static ARGV *data_restrctions;
+static ARGV *eod_restrictions;
+
+static HTABLE *smtpd_rest_classes;
+static HTABLE *policy_clnt_table;
+static HTABLE *map_command_table;
+
+static ARGV *local_rewrite_clients;
+
+ /*
+ * The routine that recursively applies restrictions.
+ */
+static int generic_checks(SMTPD_STATE *, ARGV *, const char *, const char *, const char *);
+
+ /*
+ * Recipient table check.
+ */
+static int check_sender_rcpt_maps(SMTPD_STATE *, const char *);
+static int check_recipient_rcpt_maps(SMTPD_STATE *, const char *);
+static int check_rcpt_maps(SMTPD_STATE *, const char *, const char *,
+ const char *);
+
+ /*
+ * Tempfail actions;
+ */
+static int unk_name_tf_act;
+static int unk_addr_tf_act;
+static int unv_rcpt_tf_act;
+static int unv_from_tf_act;
+
+ /*
+ * Optional permit logging.
+ */
+static STRING_LIST *smtpd_acl_perm_log;
+
+ /*
+ * YASLM.
+ */
+#define STR vstring_str
+#define CONST_STR(x) ((const char *) vstring_str(x))
+#define UPDATE_STRING(ptr,val) { if (ptr) myfree(ptr); ptr = mystrdup(val); }
+
+ /*
+ * If some decision can't be made due to a temporary error, then change
+ * other decisions into deferrals.
+ *
+ * XXX Deferrals can be postponed only with restrictions that are based on
+ * client-specified information: this restricts their use to parameters
+ * given in HELO, MAIL FROM, RCPT TO commands.
+ *
+ * XXX Deferrals must not be postponed after client hostname lookup failure.
+ * The reason is that the effect of access tables may depend on whether a
+ * client hostname is available or not. Thus, the reject_unknown_client
+ * restriction must defer immediately when lookup fails, otherwise incorrect
+ * results happen with:
+ *
+ * reject_unknown_client, hostname-based white-list, reject
+ *
+ * XXX With warn_if_reject, don't raise the defer_if_permit flag when a
+ * reject-style restriction fails. Instead, log the warning for the
+ * resulting defer message.
+ *
+ * XXX With warn_if_reject, do raise the defer_if_reject flag when a
+ * permit-style restriction fails. Otherwise, we could reject legitimate
+ * mail.
+ */
+static int PRINTFLIKE(5, 6) defer_if(SMTPD_DEFER *, int, int, const char *, const char *,...);
+static int PRINTFLIKE(5, 6) smtpd_check_reject(SMTPD_STATE *, int, int, const char *, const char *,...);
+
+#define DEFER_IF_REJECT2(state, class, code, dsn, fmt, a1, a2) \
+ defer_if(&(state)->defer_if_reject, (class), (code), (dsn), (fmt), (a1), (a2))
+#define DEFER_IF_REJECT3(state, class, code, dsn, fmt, a1, a2, a3) \
+ defer_if(&(state)->defer_if_reject, (class), (code), (dsn), (fmt), (a1), (a2), (a3))
+#define DEFER_IF_REJECT4(state, class, code, dsn, fmt, a1, a2, a3, a4) \
+ defer_if(&(state)->defer_if_reject, (class), (code), (dsn), (fmt), (a1), (a2), (a3), (a4))
+
+ /*
+ * The following choose between DEFER_IF_PERMIT (only if warn_if_reject is
+ * turned off) and plain DEFER. See tempfail_actions[] below for the mapping
+ * from names to numeric action code.
+ */
+#define DEFER_ALL_ACT 0
+#define DEFER_IF_PERMIT_ACT 1
+
+#define DEFER_IF_PERMIT2(type, state, class, code, dsn, fmt, a1, a2) \
+ (((state)->warn_if_reject == 0 && (type) != 0) ? \
+ defer_if(&(state)->defer_if_permit, (class), (code), (dsn), (fmt), (a1), (a2)) \
+ : \
+ smtpd_check_reject((state), (class), (code), (dsn), (fmt), (a1), (a2)))
+#define DEFER_IF_PERMIT3(type, state, class, code, dsn, fmt, a1, a2, a3) \
+ (((state)->warn_if_reject == 0 && (type) != 0) ? \
+ defer_if(&(state)->defer_if_permit, (class), (code), (dsn), (fmt), (a1), (a2), (a3)) \
+ : \
+ smtpd_check_reject((state), (class), (code), (dsn), (fmt), (a1), (a2), (a3)))
+#define DEFER_IF_PERMIT4(type, state, class, code, dsn, fmt, a1, a2, a3, a4) \
+ (((state)->warn_if_reject == 0 && (type) != 0) ? \
+ defer_if(&(state)->defer_if_permit, (class), (code), (dsn), (fmt), (a1), (a2), (a3), (a4)) \
+ : \
+ smtpd_check_reject((state), (class), (code), (dsn), (fmt), (a1), (a2), (a3), (a4)))
+
+ /*
+ * Cached RBL lookup state.
+ */
+typedef struct {
+ char *txt; /* TXT content or NULL */
+ DNS_RR *a; /* A records */
+} SMTPD_RBL_STATE;
+
+static void *rbl_pagein(const char *, void *);
+static void rbl_pageout(void *, void *);
+static void *rbl_byte_pagein(const char *, void *);
+static void rbl_byte_pageout(void *, void *);
+
+ /*
+ * Context for RBL $name expansion.
+ */
+typedef struct {
+ SMTPD_STATE *state; /* general state */
+ char *domain; /* query domain */
+ const char *what; /* rejected value */
+ const char *class; /* name of rejected value */
+ const char *txt; /* randomly selected trimmed TXT rr */
+} SMTPD_RBL_EXPAND_CONTEXT;
+
+ /*
+ * Multiplication factor for free space check. Free space must be at least
+ * smtpd_space_multf * message_size_limit.
+ */
+double smtpd_space_multf = 1.5;
+
+ /*
+ * SMTPD policy client. Most attributes are ATTR_CLNT attributes.
+ */
+typedef struct {
+ ATTR_CLNT *client; /* client handle */
+ char *def_action; /* default action */
+ char *policy_context; /* context of policy request */
+} SMTPD_POLICY_CLNT;
+
+ /*
+ * Table-driven parsing of main.cf parameter overrides for specific policy
+ * clients. We derive the override names from the corresponding main.cf
+ * parameter names by skipping the redundant "smtpd_policy_service_" prefix.
+ */
+static ATTR_OVER_TIME time_table[] = {
+ 21 + (const char *) VAR_SMTPD_POLICY_TMOUT, DEF_SMTPD_POLICY_TMOUT, 0, 1, 0,
+ 21 + (const char *) VAR_SMTPD_POLICY_IDLE, DEF_SMTPD_POLICY_IDLE, 0, 1, 0,
+ 21 + (const char *) VAR_SMTPD_POLICY_TTL, DEF_SMTPD_POLICY_TTL, 0, 1, 0,
+ 21 + (const char *) VAR_SMTPD_POLICY_TRY_DELAY, DEF_SMTPD_POLICY_TRY_DELAY, 0, 1, 0,
+ 0,
+};
+static ATTR_OVER_INT int_table[] = {
+ 21 + (const char *) VAR_SMTPD_POLICY_REQ_LIMIT, 0, 0, 0,
+ 21 + (const char *) VAR_SMTPD_POLICY_TRY_LIMIT, 0, 1, 0,
+ 0,
+};
+static ATTR_OVER_STR str_table[] = {
+ 21 + (const char *) VAR_SMTPD_POLICY_DEF_ACTION, 0, 1, 0,
+ 21 + (const char *) VAR_SMTPD_POLICY_CONTEXT, 0, 1, 0,
+ 0,
+};
+
+#define link_override_table_to_variable(table, var) \
+ do { table[var##_offset].target = &var; } while (0)
+
+#define smtpd_policy_tmout_offset 0
+#define smtpd_policy_idle_offset 1
+#define smtpd_policy_ttl_offset 2
+#define smtpd_policy_try_delay_offset 3
+
+#define smtpd_policy_req_limit_offset 0
+#define smtpd_policy_try_limit_offset 1
+
+#define smtpd_policy_def_action_offset 0
+#define smtpd_policy_context_offset 1
+
+/* policy_client_register - register policy service endpoint */
+
+static void policy_client_register(const char *name)
+{
+ static const char myname[] = "policy_client_register";
+ SMTPD_POLICY_CLNT *policy_client;
+ char *saved_name = 0;
+ const char *policy_name = 0;
+ char *cp;
+ const char *sep = CHARS_COMMA_SP;
+ const char *parens = CHARS_BRACE;
+ char *err;
+
+ if (policy_clnt_table == 0)
+ policy_clnt_table = htable_create(1);
+
+ if (htable_find(policy_clnt_table, name) == 0) {
+
+ /*
+ * Allow per-service overrides for main.cf global settings.
+ */
+ int smtpd_policy_tmout = var_smtpd_policy_tmout;
+ int smtpd_policy_idle = var_smtpd_policy_idle;
+ int smtpd_policy_ttl = var_smtpd_policy_ttl;
+ int smtpd_policy_try_delay = var_smtpd_policy_try_delay;
+ int smtpd_policy_req_limit = var_smtpd_policy_req_limit;
+ int smtpd_policy_try_limit = var_smtpd_policy_try_limit;
+ const char *smtpd_policy_def_action = var_smtpd_policy_def_action;
+ const char *smtpd_policy_context = var_smtpd_policy_context;
+
+ link_override_table_to_variable(time_table, smtpd_policy_tmout);
+ link_override_table_to_variable(time_table, smtpd_policy_idle);
+ link_override_table_to_variable(time_table, smtpd_policy_ttl);
+ link_override_table_to_variable(time_table, smtpd_policy_try_delay);
+ link_override_table_to_variable(int_table, smtpd_policy_req_limit);
+ link_override_table_to_variable(int_table, smtpd_policy_try_limit);
+ link_override_table_to_variable(str_table, smtpd_policy_def_action);
+ link_override_table_to_variable(str_table, smtpd_policy_context);
+
+ if (*name == parens[0]) {
+ cp = saved_name = mystrdup(name);
+ if ((err = extpar(&cp, parens, EXTPAR_FLAG_NONE)) != 0)
+ msg_fatal("policy service syntax error: %s", cp);
+ if ((policy_name = mystrtok(&cp, sep)) == 0)
+ msg_fatal("empty policy service: \"%s\"", name);
+ attr_override(cp, sep, parens,
+ CA_ATTR_OVER_TIME_TABLE(time_table),
+ CA_ATTR_OVER_INT_TABLE(int_table),
+ CA_ATTR_OVER_STR_TABLE(str_table),
+ CA_ATTR_OVER_END);
+ } else {
+ policy_name = name;
+ }
+ if (msg_verbose)
+ msg_info("%s: name=\"%s\" default_action=\"%s\" max_idle=%d "
+ "max_ttl=%d request_limit=%d retry_delay=%d "
+ "timeout=%d try_limit=%d policy_context=\"%s\"",
+ myname, policy_name, smtpd_policy_def_action,
+ smtpd_policy_idle, smtpd_policy_ttl,
+ smtpd_policy_req_limit, smtpd_policy_try_delay,
+ smtpd_policy_tmout, smtpd_policy_try_limit,
+ smtpd_policy_context);
+
+ /*
+ * Create the client.
+ */
+ policy_client = (SMTPD_POLICY_CLNT *) mymalloc(sizeof(*policy_client));
+ policy_client->client = attr_clnt_create(policy_name,
+ smtpd_policy_tmout,
+ smtpd_policy_idle,
+ smtpd_policy_ttl);
+
+ attr_clnt_control(policy_client->client,
+ ATTR_CLNT_CTL_REQ_LIMIT, smtpd_policy_req_limit,
+ ATTR_CLNT_CTL_TRY_LIMIT, smtpd_policy_try_limit,
+ ATTR_CLNT_CTL_TRY_DELAY, smtpd_policy_try_delay,
+ ATTR_CLNT_CTL_END);
+ policy_client->def_action = mystrdup(smtpd_policy_def_action);
+ policy_client->policy_context = mystrdup(smtpd_policy_context);
+ htable_enter(policy_clnt_table, name, (void *) policy_client);
+ if (saved_name)
+ myfree(saved_name);
+ }
+}
+
+/* command_map_register - register access table for maps lookup */
+
+static void command_map_register(const char *name)
+{
+ MAPS *maps;
+
+ if (map_command_table == 0)
+ map_command_table = htable_create(1);
+
+ if (htable_find(map_command_table, name) == 0) {
+ maps = maps_create(name, name, DICT_FLAG_LOCK
+ | DICT_FLAG_FOLD_FIX
+ | DICT_FLAG_UTF8_REQUEST);
+ (void) htable_enter(map_command_table, name, (void *) maps);
+ }
+}
+
+/* smtpd_check_parse - pre-parse restrictions */
+
+static ARGV *smtpd_check_parse(int flags, const char *checks)
+{
+ char *saved_checks = mystrdup(checks);
+ ARGV *argv = argv_alloc(1);
+ char *bp = saved_checks;
+ char *name;
+ char *last = 0;
+
+ /*
+ * Pre-parse the restriction list, and open any dictionaries that we
+ * encounter. Dictionaries must be opened before entering the chroot
+ * jail.
+ */
+#define SMTPD_CHECK_PARSE_POLICY (1<<0)
+#define SMTPD_CHECK_PARSE_MAPS (1<<1)
+#define SMTPD_CHECK_PARSE_ALL (~0)
+
+ while ((name = mystrtokq(&bp, CHARS_COMMA_SP, CHARS_BRACE)) != 0) {
+ argv_add(argv, name, (char *) 0);
+ if ((flags & SMTPD_CHECK_PARSE_POLICY)
+ && last && strcasecmp(last, CHECK_POLICY_SERVICE) == 0)
+ policy_client_register(name);
+ else if ((flags & SMTPD_CHECK_PARSE_MAPS) && strchr(name, ':') != 0) {
+ command_map_register(name);
+ }
+ last = name;
+ }
+ argv_terminate(argv);
+
+ /*
+ * Cleanup.
+ */
+ myfree(saved_checks);
+ return (argv);
+}
+
+#ifndef TEST
+
+/* has_required - make sure required restriction is present */
+
+static int has_required(ARGV *restrictions, const char **required)
+{
+ char **rest;
+ const char **reqd;
+ ARGV *expansion;
+
+ /*
+ * Recursively check list membership.
+ */
+ for (rest = restrictions->argv; *rest; rest++) {
+ if (strcasecmp(*rest, WARN_IF_REJECT) == 0 && rest[1] != 0) {
+ rest += 1;
+ continue;
+ }
+ if (strcasecmp(*rest, PERMIT_ALL) == 0) {
+ if (rest[1] != 0)
+ msg_warn("restriction `%s' after `%s' is ignored",
+ rest[1], rest[0]);
+ return (0);
+ }
+ for (reqd = required; *reqd; reqd++)
+ if (strcasecmp(*rest, *reqd) == 0)
+ return (1);
+ /* XXX This lookup operation should not be case-sensitive. */
+ if ((expansion = (ARGV *) htable_find(smtpd_rest_classes, *rest)) != 0)
+ if (has_required(expansion, required))
+ return (1);
+ }
+ return (0);
+}
+
+/* fail_required - handle failure to use required restriction */
+
+static void fail_required(const char *name, const char **required)
+{
+ const char *myname = "fail_required";
+ const char **reqd;
+ VSTRING *example;
+
+ /*
+ * Sanity check.
+ */
+ if (required[0] == 0)
+ msg_panic("%s: null required list", myname);
+
+ /*
+ * Go bust.
+ */
+ example = vstring_alloc(10);
+ for (reqd = required; *reqd; reqd++)
+ vstring_sprintf_append(example, "%s%s", *reqd,
+ reqd[1] == 0 ? "" : reqd[2] == 0 ? " or " : ", ");
+ msg_fatal("in parameter %s, specify at least one working instance of: %s",
+ name, STR(example));
+}
+
+#endif
+
+/* smtpd_check_init - initialize once during process lifetime */
+
+void smtpd_check_init(void)
+{
+ char *saved_classes;
+ const char *name;
+ const char *value;
+ char *cp;
+
+#ifndef TEST
+ static const char *rcpt_required[] = {
+ REJECT_UNAUTH_DEST,
+ DEFER_UNAUTH_DEST,
+ REJECT_ALL,
+ DEFER_ALL,
+ DEFER_IF_PERMIT,
+ CHECK_RELAY_DOMAINS,
+ 0,
+ };
+
+#endif
+ static NAME_CODE tempfail_actions[] = {
+ DEFER_ALL, DEFER_ALL_ACT,
+ DEFER_IF_PERMIT, DEFER_IF_PERMIT_ACT,
+ 0, -1,
+ };
+
+ /*
+ * Pre-open access control lists before going to jail.
+ */
+ mynetworks_curr =
+ namadr_list_init(VAR_MYNETWORKS, MATCH_FLAG_RETURN
+ | match_parent_style(VAR_MYNETWORKS), var_mynetworks);
+ mynetworks_new =
+ namadr_list_init(VAR_MYNETWORKS, MATCH_FLAG_RETURN
+ | match_parent_style(VAR_MYNETWORKS), mynetworks_host());
+ relay_domains =
+ domain_list_init(VAR_RELAY_DOMAINS,
+ match_parent_style(VAR_RELAY_DOMAINS),
+ var_relay_domains);
+ perm_mx_networks =
+ namadr_list_init(VAR_PERM_MX_NETWORKS, MATCH_FLAG_RETURN
+ | match_parent_style(VAR_PERM_MX_NETWORKS),
+ var_perm_mx_networks);
+#ifdef USE_TLS
+ relay_ccerts = maps_create(VAR_RELAY_CCERTS, var_smtpd_relay_ccerts,
+ DICT_FLAG_LOCK | DICT_FLAG_FOLD_FIX);
+#endif
+
+ /*
+ * Pre-parse and pre-open the recipient maps.
+ */
+ local_rcpt_maps = maps_create(VAR_LOCAL_RCPT_MAPS, var_local_rcpt_maps,
+ DICT_FLAG_LOCK | DICT_FLAG_FOLD_FIX
+ | DICT_FLAG_UTF8_REQUEST);
+ send_canon_maps = maps_create(VAR_SEND_CANON_MAPS, var_send_canon_maps,
+ DICT_FLAG_LOCK | DICT_FLAG_FOLD_FIX
+ | DICT_FLAG_UTF8_REQUEST);
+ rcpt_canon_maps = maps_create(VAR_RCPT_CANON_MAPS, var_rcpt_canon_maps,
+ DICT_FLAG_LOCK | DICT_FLAG_FOLD_FIX
+ | DICT_FLAG_UTF8_REQUEST);
+ canonical_maps = maps_create(VAR_CANONICAL_MAPS, var_canonical_maps,
+ DICT_FLAG_LOCK | DICT_FLAG_FOLD_FIX
+ | DICT_FLAG_UTF8_REQUEST);
+ virt_alias_maps = maps_create(VAR_VIRT_ALIAS_MAPS, var_virt_alias_maps,
+ DICT_FLAG_LOCK | DICT_FLAG_FOLD_FIX
+ | DICT_FLAG_UTF8_REQUEST);
+ virt_mailbox_maps = maps_create(VAR_VIRT_MAILBOX_MAPS,
+ var_virt_mailbox_maps,
+ DICT_FLAG_LOCK | DICT_FLAG_FOLD_FIX
+ | DICT_FLAG_UTF8_REQUEST);
+ relay_rcpt_maps = maps_create(VAR_RELAY_RCPT_MAPS, var_relay_rcpt_maps,
+ DICT_FLAG_LOCK | DICT_FLAG_FOLD_FIX
+ | DICT_FLAG_UTF8_REQUEST);
+
+#ifdef TEST
+ virt_alias_doms = string_list_init(VAR_VIRT_ALIAS_DOMS, MATCH_FLAG_NONE,
+ var_virt_alias_doms);
+ virt_mailbox_doms = string_list_init(VAR_VIRT_MAILBOX_DOMS, MATCH_FLAG_NONE,
+ var_virt_mailbox_doms);
+#endif
+
+ access_parent_style = match_parent_style(SMTPD_ACCESS_MAPS);
+
+ /*
+ * Templates for RBL rejection replies.
+ */
+ rbl_reply_maps = maps_create(VAR_RBL_REPLY_MAPS, var_rbl_reply_maps,
+ DICT_FLAG_LOCK | DICT_FLAG_FOLD_FIX
+ | DICT_FLAG_UTF8_REQUEST);
+
+ /*
+ * Sender to login name mapping.
+ */
+ smtpd_sender_login_maps = maps_create(VAR_SMTPD_SND_AUTH_MAPS,
+ var_smtpd_snd_auth_maps,
+ DICT_FLAG_LOCK | DICT_FLAG_FOLD_FIX
+ | DICT_FLAG_UTF8_REQUEST);
+
+ /*
+ * error_text is used for returning error responses.
+ */
+ error_text = vstring_alloc(10);
+
+ /*
+ * Initialize the resolved address cache. Note: the cache persists across
+ * SMTP sessions so we cannot make it dependent on session state.
+ */
+ smtpd_resolve_init(100);
+
+ /*
+ * Initialize the RBL lookup cache. Note: the cache persists across SMTP
+ * sessions so we cannot make it dependent on session state.
+ */
+ smtpd_rbl_cache = ctable_create(100, rbl_pagein, rbl_pageout, (void *) 0);
+ smtpd_rbl_byte_cache = ctable_create(1000, rbl_byte_pagein,
+ rbl_byte_pageout, (void *) 0);
+
+ /*
+ * Pre-parse the restriction lists. At the same time, pre-open tables
+ * before going to jail.
+ */
+ client_restrctions = smtpd_check_parse(SMTPD_CHECK_PARSE_ALL,
+ var_client_checks);
+ helo_restrctions = smtpd_check_parse(SMTPD_CHECK_PARSE_ALL,
+ var_helo_checks);
+ mail_restrctions = smtpd_check_parse(SMTPD_CHECK_PARSE_ALL,
+ var_mail_checks);
+ relay_restrctions = smtpd_check_parse(SMTPD_CHECK_PARSE_ALL,
+ var_relay_checks);
+ if (warn_compat_break_relay_restrictions)
+ fake_relay_restrctions = smtpd_check_parse(SMTPD_CHECK_PARSE_ALL,
+ FAKE_RELAY_CHECKS);
+ rcpt_restrctions = smtpd_check_parse(SMTPD_CHECK_PARSE_ALL,
+ var_rcpt_checks);
+ etrn_restrctions = smtpd_check_parse(SMTPD_CHECK_PARSE_ALL,
+ var_etrn_checks);
+ data_restrctions = smtpd_check_parse(SMTPD_CHECK_PARSE_ALL,
+ var_data_checks);
+ eod_restrictions = smtpd_check_parse(SMTPD_CHECK_PARSE_ALL,
+ var_eod_checks);
+
+ /*
+ * Parse the pre-defined restriction classes.
+ */
+ smtpd_rest_classes = htable_create(1);
+ if (*var_rest_classes) {
+ cp = saved_classes = mystrdup(var_rest_classes);
+ while ((name = mystrtok(&cp, CHARS_COMMA_SP)) != 0) {
+ if ((value = mail_conf_lookup_eval(name)) == 0 || *value == 0)
+ msg_fatal("restriction class `%s' needs a definition", name);
+ /* XXX This store operation should not be case-sensitive. */
+ htable_enter(smtpd_rest_classes, name,
+ (void *) smtpd_check_parse(SMTPD_CHECK_PARSE_ALL,
+ value));
+ }
+ myfree(saved_classes);
+ }
+
+ /*
+ * This is the place to specify definitions for complex restrictions such
+ * as check_relay_domains in terms of more elementary restrictions.
+ */
+#if 0
+ htable_enter(smtpd_rest_classes, "check_relay_domains",
+ smtpd_check_parse(SMTPD_CHECK_PARSE_ALL,
+ "permit_mydomain reject_unauth_destination"));
+#endif
+ htable_enter(smtpd_rest_classes, REJECT_SENDER_LOGIN_MISMATCH,
+ (void *) smtpd_check_parse(SMTPD_CHECK_PARSE_ALL,
+ REJECT_AUTH_SENDER_LOGIN_MISMATCH
+ " " REJECT_UNAUTH_SENDER_LOGIN_MISMATCH));
+
+ /*
+ * People screw up the relay restrictions too often. Require that they
+ * list at least one restriction that rejects mail by default. We allow
+ * relay restrictions to be empty for sites that require backwards
+ * compatibility.
+ */
+#ifndef TEST
+ if (!has_required(rcpt_restrctions, rcpt_required)
+ && !has_required(relay_restrctions, rcpt_required))
+ fail_required(VAR_RELAY_CHECKS " or " VAR_RCPT_CHECKS, rcpt_required);
+#endif
+
+ /*
+ * Local rewrite policy.
+ */
+ local_rewrite_clients = smtpd_check_parse(SMTPD_CHECK_PARSE_MAPS,
+ var_local_rwr_clients);
+
+ /*
+ * Tempfail_actions.
+ *
+ * XXX This name-to-number mapping should be encapsulated in a separate
+ * mail_conf_name_code.c module.
+ */
+ if ((unk_name_tf_act = name_code(tempfail_actions, NAME_CODE_FLAG_NONE,
+ var_unk_name_tf_act)) < 0)
+ msg_fatal("bad configuration: %s = %s",
+ VAR_UNK_NAME_TF_ACT, var_unk_name_tf_act);
+ if ((unk_addr_tf_act = name_code(tempfail_actions, NAME_CODE_FLAG_NONE,
+ var_unk_addr_tf_act)) < 0)
+ msg_fatal("bad configuration: %s = %s",
+ VAR_UNK_ADDR_TF_ACT, var_unk_addr_tf_act);
+ if ((unv_rcpt_tf_act = name_code(tempfail_actions, NAME_CODE_FLAG_NONE,
+ var_unv_rcpt_tf_act)) < 0)
+ msg_fatal("bad configuration: %s = %s",
+ VAR_UNV_RCPT_TF_ACT, var_unv_rcpt_tf_act);
+ if ((unv_from_tf_act = name_code(tempfail_actions, NAME_CODE_FLAG_NONE,
+ var_unv_from_tf_act)) < 0)
+ msg_fatal("bad configuration: %s = %s",
+ VAR_UNV_FROM_TF_ACT, var_unv_from_tf_act);
+ if (msg_verbose) {
+ msg_info("%s = %s", VAR_UNK_NAME_TF_ACT, tempfail_actions[unk_name_tf_act].name);
+ msg_info("%s = %s", VAR_UNK_ADDR_TF_ACT, tempfail_actions[unk_addr_tf_act].name);
+ msg_info("%s = %s", VAR_UNV_RCPT_TF_ACT, tempfail_actions[unv_rcpt_tf_act].name);
+ msg_info("%s = %s", VAR_UNV_FROM_TF_ACT, tempfail_actions[unv_from_tf_act].name);
+ }
+
+ /*
+ * Optional permit logging.
+ */
+ smtpd_acl_perm_log = string_list_init(VAR_SMTPD_ACL_PERM_LOG,
+ MATCH_FLAG_RETURN,
+ var_smtpd_acl_perm_log);
+}
+
+/* log_whatsup - log as much context as we have */
+
+static void log_whatsup(SMTPD_STATE *state, const char *whatsup,
+ const char *text)
+{
+ VSTRING *buf = vstring_alloc(100);
+
+ vstring_sprintf(buf, "%s: %s: %s from %s: %s;",
+ state->queue_id ? state->queue_id : "NOQUEUE",
+ whatsup, state->where, state->namaddr, text);
+ if (state->sender)
+ vstring_sprintf_append(buf, " from=<%s>", state->sender);
+ if (state->recipient)
+ vstring_sprintf_append(buf, " to=<%s>", state->recipient);
+ if (state->protocol)
+ vstring_sprintf_append(buf, " proto=%s", state->protocol);
+ if (state->helo_name)
+ vstring_sprintf_append(buf, " helo=<%s>", state->helo_name);
+ msg_info("%s", STR(buf));
+ vstring_free(buf);
+}
+
+/* smtpd_acl_permit - permit request with optional logging */
+
+static int PRINTFLIKE(5, 6) smtpd_acl_permit(SMTPD_STATE *state,
+ const char *action,
+ const char *reply_class,
+ const char *reply_name,
+ const char *format,...)
+{
+ const char myname[] = "smtpd_acl_permit";
+ va_list ap;
+ const char *whatsup;
+
+#ifdef notdef
+#define NO_PRINT_ARGS ""
+#else
+#define NO_PRINT_ARGS "%s", ""
+#endif
+
+ /*
+ * First, find out if (and how) this permit action should be logged.
+ */
+ if (msg_verbose)
+ msg_info("%s: checking %s settings", myname, VAR_SMTPD_ACL_PERM_LOG);
+
+ if (state->defer_if_permit.active) {
+ /* This action is overruled. Do not log. */
+ whatsup = 0;
+ } else if (string_list_match(smtpd_acl_perm_log, action) != 0) {
+ /* This is not a test. Logging is enabled. */
+ whatsup = "permit";
+ } else {
+ /* This is not a test. Logging is disabled. */
+ whatsup = 0;
+ }
+ if (whatsup != 0) {
+ vstring_sprintf(error_text, "action=%s for %s=%s",
+ action, reply_class, reply_name);
+ if (format && *format) {
+ vstring_strcat(error_text, " ");
+ va_start(ap, format);
+ vstring_vsprintf_append(error_text, format, ap);
+ va_end(ap);
+ }
+ log_whatsup(state, whatsup, STR(error_text));
+ } else {
+ if (msg_verbose)
+ msg_info("%s: %s: no match", myname, VAR_SMTPD_ACL_PERM_LOG);
+ }
+ return (SMTPD_CHECK_OK);
+}
+
+/* smtpd_check_reject - do the boring things that must be done */
+
+static int smtpd_check_reject(SMTPD_STATE *state, int error_class,
+ int code, const char *dsn,
+ const char *format,...)
+{
+ va_list ap;
+ int warn_if_reject;
+ const char *whatsup;
+
+ /*
+ * Do not reject mail if we were asked to warn only. However,
+ * configuration/software/data errors cannot be converted into warnings.
+ */
+ if (state->warn_if_reject && error_class != MAIL_ERROR_SOFTWARE
+ && error_class != MAIL_ERROR_RESOURCE
+ && error_class != MAIL_ERROR_DATA) {
+ warn_if_reject = 1;
+ whatsup = "reject_warning";
+ } else {
+ warn_if_reject = 0;
+ whatsup = "reject";
+ }
+
+ /*
+ * Update the error class mask, and format the response. XXX What about
+ * multi-line responses? For now we cheat and send whitespace.
+ *
+ * Format the response before complaining about configuration errors, so
+ * that we can show the error in context.
+ */
+ state->error_mask |= error_class;
+ vstring_sprintf(error_text, "%d %s ", code, dsn);
+ va_start(ap, format);
+ vstring_vsprintf_append(error_text, format, ap);
+ va_end(ap);
+
+ /*
+ * Validate the response, that is, the response must begin with a
+ * three-digit status code, and the first digit must be 4 or 5. If the
+ * response is bad, log a warning and send a generic response instead.
+ */
+ if (code < 400 || code > 599) {
+ msg_warn("SMTP reply code configuration error: %s", STR(error_text));
+ vstring_strcpy(error_text, "450 4.7.1 Service unavailable");
+ }
+ if (!dsn_valid(STR(error_text) + 4)) {
+ msg_warn("DSN detail code configuration error: %s", STR(error_text));
+ vstring_strcpy(error_text, "450 4.7.1 Service unavailable");
+ }
+
+ /*
+ * Ensure RFC compliance. We could do this inside smtpd_chat_reply() and
+ * switch to multi-line for long replies.
+ */
+ vstring_truncate(error_text, 510);
+ printable(STR(error_text), ' ');
+
+ /*
+ * Force this rejection into deferral because of some earlier temporary
+ * error that may have prevented us from accepting mail, and report the
+ * earlier problem instead.
+ */
+ if (!warn_if_reject && state->defer_if_reject.active && STR(error_text)[0] == '5') {
+ state->warn_if_reject = state->defer_if_reject.active = 0;
+ return (smtpd_check_reject(state, state->defer_if_reject.class,
+ state->defer_if_reject.code,
+ STR(state->defer_if_reject.dsn),
+ "%s", STR(state->defer_if_reject.reason)));
+ }
+
+ /*
+ * Soft bounce safety net.
+ *
+ * XXX The code below also appears in the Postfix SMTP server reply output
+ * routine. It is duplicated here in order to avoid discrepancies between
+ * the reply codes that are shown in "reject" logging and the reply codes
+ * that are actually sent to the SMTP client.
+ *
+ * Implementing the soft_bounce safety net in the SMTP server reply output
+ * routine has the advantage that it covers all 5xx replies, including
+ * SMTP protocol or syntax errors, which makes soft_bounce great for
+ * non-destructive tests (especially by people who are paranoid about
+ * losing mail).
+ *
+ * We could eliminate the code duplication and implement the soft_bounce
+ * safety net only in the code below. But then the safety net would cover
+ * the UCE restrictions only. This would be at odds with documentation
+ * which says soft_bounce changes all 5xx replies into 4xx ones.
+ */
+ if (var_soft_bounce && STR(error_text)[0] == '5')
+ STR(error_text)[0] = '4';
+
+ /*
+ * In any case, enforce consistency between the SMTP code and DSN code.
+ * SMTP has the higher precedence since it came here first.
+ */
+ STR(error_text)[4] = STR(error_text)[0];
+
+ /*
+ * Log what is happening. When the sysadmin discards policy violation
+ * postmaster notices, this may be the only trace left that service was
+ * rejected. Print the request, client name/address, and response.
+ */
+ log_whatsup(state, whatsup, STR(error_text));
+
+ return (warn_if_reject ? 0 : SMTPD_CHECK_REJECT);
+}
+
+/* defer_if - prepare to change our mind */
+
+static int defer_if(SMTPD_DEFER *defer, int error_class,
+ int code, const char *dsn,
+ const char *fmt,...)
+{
+ va_list ap;
+
+ /*
+ * Keep the first reason for this type of deferral, to minimize
+ * confusion.
+ */
+ if (defer->active == 0) {
+ defer->active = 1;
+ defer->class = error_class;
+ defer->code = code;
+ if (defer->dsn == 0)
+ defer->dsn = vstring_alloc(10);
+ vstring_strcpy(defer->dsn, dsn);
+ if (defer->reason == 0)
+ defer->reason = vstring_alloc(10);
+ va_start(ap, fmt);
+ vstring_vsprintf(defer->reason, fmt, ap);
+ va_end(ap);
+ }
+ return (SMTPD_CHECK_DUNNO);
+}
+
+/* reject_dict_retry - reject with temporary failure if dict lookup fails */
+
+static NORETURN reject_dict_retry(SMTPD_STATE *state, const char *reply_name)
+{
+ longjmp(smtpd_check_buf, smtpd_check_reject(state, MAIL_ERROR_DATA,
+ 451, "4.3.0",
+ "<%s>: Temporary lookup failure",
+ reply_name));
+}
+
+/* reject_server_error - reject with temporary failure after non-dict error */
+
+static NORETURN reject_server_error(SMTPD_STATE *state)
+{
+ longjmp(smtpd_check_buf, smtpd_check_reject(state, MAIL_ERROR_SOFTWARE,
+ 451, "4.3.5",
+ "Server configuration error"));
+}
+
+/* check_mail_addr_find - reject with temporary failure if dict lookup fails */
+
+static const char *check_mail_addr_find(SMTPD_STATE *state,
+ const char *reply_name,
+ MAPS *maps, const char *key,
+ char **ext)
+{
+ const char *result;
+
+ if ((result = mail_addr_find(maps, key, ext)) != 0 || maps->error == 0)
+ return (result);
+ if (maps->error == DICT_ERR_RETRY)
+ /* Warning is already logged. */
+ reject_dict_retry(state, reply_name);
+ else
+ reject_server_error(state);
+}
+
+/* reject_unknown_reverse_name - fail if reverse client hostname is unknown */
+
+static int reject_unknown_reverse_name(SMTPD_STATE *state)
+{
+ const char *myname = "reject_unknown_reverse_name";
+
+ if (msg_verbose)
+ msg_info("%s: %s", myname, state->reverse_name);
+
+ if (state->reverse_name_status != SMTPD_PEER_CODE_OK)
+ return (smtpd_check_reject(state, MAIL_ERROR_POLICY,
+ state->reverse_name_status == SMTPD_PEER_CODE_PERM ?
+ var_unk_client_code : 450, "4.7.1",
+ "Client host rejected: cannot find your reverse hostname, [%s]",
+ state->addr));
+ return (SMTPD_CHECK_DUNNO);
+}
+
+/* reject_unknown_client - fail if client hostname is unknown */
+
+static int reject_unknown_client(SMTPD_STATE *state)
+{
+ const char *myname = "reject_unknown_client";
+
+ if (msg_verbose)
+ msg_info("%s: %s %s", myname, state->name, state->addr);
+
+ /* RFC 7372: Email Authentication Status Codes. */
+ if (state->name_status != SMTPD_PEER_CODE_OK)
+ return (smtpd_check_reject(state, MAIL_ERROR_POLICY,
+ state->name_status >= SMTPD_PEER_CODE_PERM ?
+ var_unk_client_code : 450, "4.7.25",
+ "Client host rejected: cannot find your hostname, [%s]",
+ state->addr));
+ return (SMTPD_CHECK_DUNNO);
+}
+
+/* reject_plaintext_session - fail if session is not encrypted */
+
+static int reject_plaintext_session(SMTPD_STATE *state)
+{
+ const char *myname = "reject_plaintext_session";
+
+ if (msg_verbose)
+ msg_info("%s: %s %s", myname, state->name, state->addr);
+
+#ifdef USE_TLS
+ if (state->tls_context == 0)
+#endif
+ return (smtpd_check_reject(state, MAIL_ERROR_POLICY,
+ var_plaintext_code, "4.7.1",
+ "Session encryption is required"));
+ return (SMTPD_CHECK_DUNNO);
+}
+
+/* permit_inet_interfaces - succeed if client my own address */
+
+static int permit_inet_interfaces(SMTPD_STATE *state)
+{
+ const char *myname = "permit_inet_interfaces";
+
+ if (msg_verbose)
+ msg_info("%s: %s %s", myname, state->name, state->addr);
+
+ if (own_inet_addr((struct sockaddr *) &(state->sockaddr)))
+ /* Permit logging in generic_checks() only. */
+ return (SMTPD_CHECK_OK);
+ return (SMTPD_CHECK_DUNNO);
+}
+
+/* permit_mynetworks - succeed if client is in a trusted network */
+
+static int permit_mynetworks(SMTPD_STATE *state)
+{
+ const char *myname = "permit_mynetworks";
+
+ if (msg_verbose)
+ msg_info("%s: %s %s", myname, state->name, state->addr);
+
+ if (namadr_list_match(mynetworks_curr, state->name, state->addr)) {
+ if (warn_compat_break_mynetworks_style
+ && !namadr_list_match(mynetworks_new, state->name, state->addr))
+ msg_info("using backwards-compatible default setting "
+ VAR_MYNETWORKS_STYLE "=%s to permit request from "
+ "client \"%s\"", var_mynetworks_style, state->namaddr);
+ /* Permit logging in generic_checks() only. */
+ return (SMTPD_CHECK_OK);
+ } else if (mynetworks_curr->error == 0)
+ return (SMTPD_CHECK_DUNNO);
+ else
+ return (mynetworks_curr->error);
+}
+
+/* dup_if_truncate - save hostname and truncate if it ends in dot */
+
+static char *dup_if_truncate(char *name)
+{
+ ssize_t len;
+ char *result;
+
+ /*
+ * Truncate hostnames ending in dot but not dot-dot.
+ *
+ * XXX This should not be distributed all over the code. Problem is,
+ * addresses can enter the system via multiple paths: networks, local
+ * forward/alias/include files, even as the result of address rewriting.
+ */
+ if ((len = strlen(name)) > 1
+ && name[len - 1] == '.'
+ && name[len - 2] != '.') {
+ result = mystrndup(name, len - 1);
+ } else
+ result = name;
+ return (result);
+}
+
+/* reject_invalid_hostaddr - fail if host address is incorrect */
+
+static int reject_invalid_hostaddr(SMTPD_STATE *state, char *addr,
+ char *reply_name, char *reply_class)
+{
+ const char *myname = "reject_invalid_hostaddr";
+ ssize_t len;
+ char *test_addr;
+ int stat;
+
+ if (msg_verbose)
+ msg_info("%s: %s", myname, addr);
+
+ if (addr[0] == '[' && (len = strlen(addr)) > 2 && addr[len - 1] == ']') {
+ test_addr = mystrndup(addr + 1, len - 2);
+ } else
+ test_addr = addr;
+
+ /*
+ * Validate the address.
+ */
+ if (!valid_mailhost_addr(test_addr, DONT_GRIPE))
+ stat = smtpd_check_reject(state, MAIL_ERROR_POLICY,
+ var_bad_name_code, "5.5.2",
+ "<%s>: %s rejected: invalid ip address",
+ reply_name, reply_class);
+ else
+ stat = SMTPD_CHECK_DUNNO;
+
+ /*
+ * Cleanup.
+ */
+ if (test_addr != addr)
+ myfree(test_addr);
+
+ return (stat);
+}
+
+/* reject_invalid_hostname - fail if host/domain syntax is incorrect */
+
+static int reject_invalid_hostname(SMTPD_STATE *state, char *name,
+ char *reply_name, char *reply_class)
+{
+ const char *myname = "reject_invalid_hostname";
+ char *test_name;
+ int stat;
+
+ if (msg_verbose)
+ msg_info("%s: %s", myname, name);
+
+ /*
+ * Truncate hostnames ending in dot but not dot-dot.
+ */
+ test_name = dup_if_truncate(name);
+
+ /*
+ * Validate the HELO/EHLO hostname. Fix 20140706: EAI not allowed here.
+ */
+ if (!valid_hostname(test_name, DONT_GRIPE)
+ && !valid_hostaddr(test_name, DONT_GRIPE)) /* XXX back compat */
+ stat = smtpd_check_reject(state, MAIL_ERROR_POLICY,
+ var_bad_name_code, "5.5.2",
+ "<%s>: %s rejected: Invalid name",
+ reply_name, reply_class);
+ else
+ stat = SMTPD_CHECK_DUNNO;
+
+ /*
+ * Cleanup.
+ */
+ if (test_name != name)
+ myfree(test_name);
+
+ return (stat);
+}
+
+/* reject_non_fqdn_hostname - fail if host name is not in fqdn form */
+
+static int reject_non_fqdn_hostname(SMTPD_STATE *state, char *name,
+ char *reply_name, char *reply_class)
+{
+ const char *myname = "reject_non_fqdn_hostname";
+ char *test_name;
+ int stat;
+
+ if (msg_verbose)
+ msg_info("%s: %s", myname, name);
+
+ /*
+ * Truncate hostnames ending in dot but not dot-dot.
+ */
+ test_name = dup_if_truncate(name);
+
+ /*
+ * Validate the hostname. For backwards compatibility, permit non-ASCII
+ * names only when the client requested SMTPUTF8 support.
+ */
+ if (valid_utf8_hostname(state->flags & SMTPD_FLAG_SMTPUTF8,
+ test_name, DONT_GRIPE) == 0 || strchr(test_name, '.') == 0)
+ stat = smtpd_check_reject(state, MAIL_ERROR_POLICY,
+ var_non_fqdn_code, "5.5.2",
+ "<%s>: %s rejected: need fully-qualified hostname",
+ reply_name, reply_class);
+ else
+ stat = SMTPD_CHECK_DUNNO;
+
+ /*
+ * Cleanup.
+ */
+ if (test_name != name)
+ myfree(test_name);
+
+ return (stat);
+}
+
+/* reject_unknown_hostname - fail if name has no A, AAAA or MX record */
+
+static int reject_unknown_hostname(SMTPD_STATE *state, char *name,
+ char *reply_name, char *reply_class)
+{
+ const char *myname = "reject_unknown_hostname";
+ int dns_status;
+ DNS_RR *dummy;
+
+ if (msg_verbose)
+ msg_info("%s: %s", myname, name);
+
+#ifdef T_AAAA
+#define RR_ADDR_TYPES T_A, T_AAAA
+#else
+#define RR_ADDR_TYPES T_A
+#endif
+
+ dns_status = dns_lookup_l(name, 0, &dummy, (VSTRING *) 0,
+ (VSTRING *) 0, DNS_REQ_FLAG_STOP_OK,
+ RR_ADDR_TYPES, T_MX, 0);
+ if (dummy)
+ dns_rr_free(dummy);
+ /* Allow MTA names to have nullMX records. */
+ if (dns_status != DNS_OK && dns_status != DNS_NULLMX) {
+ if (dns_status == DNS_POLICY) {
+ msg_warn("%s: address or MX lookup error: %s",
+ name, "DNS reply filter drops all results");
+ return (SMTPD_CHECK_DUNNO);
+ }
+ if (dns_status != DNS_RETRY)
+ return (smtpd_check_reject(state, MAIL_ERROR_POLICY,
+ var_unk_name_code, "4.7.1",
+ "<%s>: %s rejected: %s",
+ reply_name, reply_class,
+ dns_status == DNS_INVAL ?
+ "Malformed DNS server reply" :
+ "Host not found"));
+ else
+ return (DEFER_IF_PERMIT2(unk_name_tf_act, state, MAIL_ERROR_POLICY,
+ 450, "4.7.1",
+ "<%s>: %s rejected: Host not found",
+ reply_name, reply_class));
+ }
+ return (SMTPD_CHECK_DUNNO);
+}
+
+/* reject_unknown_mailhost - fail if name has no A, AAAA or MX record */
+
+static int reject_unknown_mailhost(SMTPD_STATE *state, const char *name,
+ const char *reply_name, const char *reply_class)
+{
+ const char *myname = "reject_unknown_mailhost";
+ int dns_status;
+ DNS_RR *dummy;
+ const char *aname;
+
+ if (msg_verbose)
+ msg_info("%s: %s", myname, name);
+
+ /*
+ * Fix 20140924: convert domain to ASCII.
+ */
+#ifndef NO_EAI
+ if (!allascii(name) && (aname = midna_domain_to_ascii(name)) != 0) {
+ if (msg_verbose)
+ msg_info("%s asciified to %s", name, aname);
+ name = aname;
+ }
+#endif
+
+#define MAILHOST_LOOKUP_FLAGS \
+ (DNS_REQ_FLAG_STOP_OK | DNS_REQ_FLAG_STOP_INVAL | \
+ DNS_REQ_FLAG_STOP_NULLMX | DNS_REQ_FLAG_STOP_MX_POLICY)
+
+ dns_status = dns_lookup_l(name, 0, &dummy, (VSTRING *) 0,
+ (VSTRING *) 0, MAILHOST_LOOKUP_FLAGS,
+ T_MX, RR_ADDR_TYPES, 0);
+ if (dummy)
+ dns_rr_free(dummy);
+ if (dns_status != DNS_OK) { /* incl. DNS_INVAL */
+ if (dns_status == DNS_POLICY) {
+ msg_warn("%s: MX or address lookup error: %s",
+ name, "DNS reply filter drops all results");
+ return (SMTPD_CHECK_DUNNO);
+ }
+ if (dns_status == DNS_NULLMX)
+ return (smtpd_check_reject(state, MAIL_ERROR_POLICY,
+ strcmp(reply_class, SMTPD_NAME_SENDER) == 0 ?
+ 550 : 556,
+ strcmp(reply_class, SMTPD_NAME_SENDER) == 0 ?
+ "4.7.27" : "4.1.10",
+ "<%s>: %s rejected: Domain %s "
+ "does not accept mail (nullMX)",
+ reply_name, reply_class, name));
+ if (dns_status != DNS_RETRY)
+ return (smtpd_check_reject(state, MAIL_ERROR_POLICY,
+ var_unk_addr_code,
+ strcmp(reply_class, SMTPD_NAME_SENDER) == 0 ?
+ "4.1.8" : "4.1.2",
+ "<%s>: %s rejected: %s",
+ reply_name, reply_class,
+ dns_status == DNS_INVAL ?
+ "Malformed DNS server reply" :
+ "Domain not found"));
+ else
+ return (DEFER_IF_PERMIT2(unk_addr_tf_act, state, MAIL_ERROR_POLICY,
+ 450, strcmp(reply_class, SMTPD_NAME_SENDER) == 0 ?
+ "4.1.8" : "4.1.2",
+ "<%s>: %s rejected: Domain not found",
+ reply_name, reply_class));
+ }
+ return (SMTPD_CHECK_DUNNO);
+}
+
+static int permit_auth_destination(SMTPD_STATE *state, char *recipient);
+
+/* permit_tls_clientcerts - OK/DUNNO for message relaying, or set dict_errno */
+
+static int permit_tls_clientcerts(SMTPD_STATE *state, int permit_all_certs)
+{
+#ifdef USE_TLS
+ const char *found = 0;
+
+ if (!state->tls_context)
+ return SMTPD_CHECK_DUNNO;
+
+ if (TLS_CERT_IS_TRUSTED(state->tls_context) && permit_all_certs) {
+ if (msg_verbose)
+ msg_info("Relaying allowed for all verified client certificates");
+ /* Permit logging in generic_checks() only. */
+ return (SMTPD_CHECK_OK);
+ }
+
+ /*
+ * When directly checking the fingerprint, it is OK if the issuing CA is
+ * not trusted.
+ */
+ if (TLS_CERT_IS_PRESENT(state->tls_context)) {
+ int i;
+ char *prints[2];
+
+ prints[0] = state->tls_context->peer_cert_fprint;
+ prints[1] = state->tls_context->peer_pkey_fprint;
+
+ /* After lookup error, leave relay_ccerts->error at non-zero value. */
+ for (i = 0; i < 2; ++i) {
+ found = maps_find(relay_ccerts, prints[i], DICT_FLAG_NONE);
+ if (found != 0) {
+ if (msg_verbose)
+ msg_info("Relaying allowed for certified client: %s", found);
+ /* Permit logging in generic_checks() only. */
+ return (SMTPD_CHECK_OK);
+ } else if (relay_ccerts->error != 0) {
+ msg_warn("relay_clientcerts: lookup error for fingerprint '%s', "
+ "pkey fingerprint %s", prints[0], prints[1]);
+ return (relay_ccerts->error);
+ }
+ }
+ if (msg_verbose)
+ msg_info("relay_clientcerts: No match for fingerprint '%s', "
+ "pkey fingerprint %s", prints[0], prints[1]);
+ }
+#endif
+ return (SMTPD_CHECK_DUNNO);
+}
+
+/* check_relay_domains - OK/FAIL for message relaying */
+
+static int check_relay_domains(SMTPD_STATE *state, char *recipient,
+ char *reply_name, char *reply_class)
+{
+ const char *myname = "check_relay_domains";
+
+#if 1
+ static int once;
+
+ if (once == 0) {
+ once = 1;
+ msg_warn("support for restriction \"%s\" will be removed from %s; "
+ "use \"%s\" instead",
+ CHECK_RELAY_DOMAINS, var_mail_name, REJECT_UNAUTH_DEST);
+ }
+#endif
+
+ if (msg_verbose)
+ msg_info("%s: %s", myname, recipient);
+
+ /*
+ * Permit if the client matches the relay_domains list.
+ */
+ if (domain_list_match(relay_domains, state->name)) {
+ if (warn_compat_break_relay_domains)
+ msg_info("using backwards-compatible default setting "
+ VAR_RELAY_DOMAINS "=$mydestination to permit "
+ "request from client \"%s\"", state->name);
+ return (SMTPD_CHECK_OK);
+ }
+
+ /*
+ * Permit authorized destinations.
+ */
+ if (permit_auth_destination(state, recipient) == SMTPD_CHECK_OK)
+ return (SMTPD_CHECK_OK);
+
+ /*
+ * Deny relaying between sites that both are not in relay_domains.
+ */
+ return (smtpd_check_reject(state, MAIL_ERROR_POLICY,
+ var_relay_code, "5.7.1",
+ "<%s>: %s rejected: Relay access denied",
+ reply_name, reply_class));
+}
+
+/* permit_auth_destination - OK for message relaying */
+
+static int permit_auth_destination(SMTPD_STATE *state, char *recipient)
+{
+ const char *myname = "permit_auth_destination";
+ const RESOLVE_REPLY *reply;
+ const char *domain;
+
+ if (msg_verbose)
+ msg_info("%s: %s", myname, recipient);
+
+ /*
+ * Resolve the address.
+ */
+ reply = smtpd_resolve_addr(state->sender, recipient);
+ if (reply->flags & RESOLVE_FLAG_FAIL)
+ reject_dict_retry(state, recipient);
+
+ /*
+ * Handle special case that is not supposed to happen.
+ */
+ if ((domain = strrchr(CONST_STR(reply->recipient), '@')) == 0)
+ return (SMTPD_CHECK_OK);
+ domain += 1;
+
+ /*
+ * Skip source-routed non-local or virtual mail (uncertain destination).
+ */
+ if (var_allow_untrust_route == 0 && (reply->flags & RESOLVE_FLAG_ROUTED))
+ return (SMTPD_CHECK_DUNNO);
+
+ /*
+ * Permit final delivery: the destination matches mydestination,
+ * virtual_alias_domains, or virtual_mailbox_domains.
+ */
+ if (reply->flags & RESOLVE_CLASS_FINAL)
+ return (SMTPD_CHECK_OK);
+
+ /*
+ * Permit if the destination matches the relay_domains list.
+ */
+ if (reply->flags & RESOLVE_CLASS_RELAY) {
+ if (warn_compat_break_relay_domains)
+ msg_info("using backwards-compatible default setting "
+ VAR_RELAY_DOMAINS "=$mydestination to accept mail "
+ "for domain \"%s\"", domain);
+ return (SMTPD_CHECK_OK);
+ }
+
+ /*
+ * Skip when not matched
+ */
+ return (SMTPD_CHECK_DUNNO);
+}
+
+/* reject_unauth_destination - FAIL for message relaying */
+
+static int reject_unauth_destination(SMTPD_STATE *state, char *recipient,
+ int reply_code, const char *reply_dsn)
+{
+ const char *myname = "reject_unauth_destination";
+
+ if (msg_verbose)
+ msg_info("%s: %s", myname, recipient);
+
+ /*
+ * Skip authorized destination.
+ */
+ if (permit_auth_destination(state, recipient) == SMTPD_CHECK_OK)
+ return (SMTPD_CHECK_DUNNO);
+
+ /*
+ * Reject relaying to sites that are not listed in relay_domains.
+ */
+ return (smtpd_check_reject(state, MAIL_ERROR_POLICY,
+ reply_code, reply_dsn,
+ "<%s>: Relay access denied",
+ recipient));
+}
+
+/* reject_unauth_pipelining - reject improper use of SMTP command pipelining */
+
+static int reject_unauth_pipelining(SMTPD_STATE *state,
+ const char *reply_name, const char *reply_class)
+{
+ const char *myname = "reject_unauth_pipelining";
+
+ if (msg_verbose)
+ msg_info("%s: %s", myname, state->where);
+
+ if (state->flags & SMTPD_FLAG_ILL_PIPELINING)
+ return (smtpd_check_reject(state, MAIL_ERROR_PROTOCOL,
+ 503, "5.5.0",
+ "<%s>: %s rejected: Improper use of SMTP command pipelining",
+ reply_name, reply_class));
+
+ return (SMTPD_CHECK_DUNNO);
+}
+
+/* all_auth_mx_addr - match host addresses against permit_mx_backup_networks */
+
+static int all_auth_mx_addr(SMTPD_STATE *state, char *host,
+ const char *reply_name, const char *reply_class)
+{
+ const char *myname = "all_auth_mx_addr";
+ MAI_HOSTADDR_STR hostaddr;
+ DNS_RR *rr;
+ DNS_RR *addr_list;
+ int dns_status;
+
+ if (msg_verbose)
+ msg_info("%s: host %s", myname, host);
+
+ /*
+ * If we can't lookup the host, defer.
+ */
+#define NOPE 0
+#define YUP 1
+
+ /*
+ * Verify that all host addresses are within permit_mx_backup_networks.
+ */
+ dns_status = dns_lookup_v(host, 0, &addr_list, (VSTRING *) 0, (VSTRING *) 0,
+ DNS_REQ_FLAG_NONE, inet_proto_info()->dns_atype_list);
+ /* DNS_NULLMX is not applicable here. */
+ if (dns_status != DNS_OK) { /* incl. DNS_INVAL */
+ DEFER_IF_REJECT4(state, MAIL_ERROR_POLICY,
+ 450, "4.4.4",
+ "<%s>: %s rejected: Unable to look up host "
+ "%s as mail exchanger: %s",
+ reply_name, reply_class, host,
+ dns_status == DNS_POLICY ?
+ "DNS reply filter policy" : dns_strerror(h_errno));
+ return (NOPE);
+ }
+ for (rr = addr_list; rr != 0; rr = rr->next) {
+ if (dns_rr_to_pa(rr, &hostaddr) == 0) {
+ msg_warn("%s: skipping record type %s for host %s: %m",
+ myname, dns_strtype(rr->type), host);
+ continue;
+ }
+ if (msg_verbose)
+ msg_info("%s: checking: %s", myname, hostaddr.buf);
+
+ if (!namadr_list_match(perm_mx_networks, host, hostaddr.buf)) {
+ if (perm_mx_networks->error == 0) {
+
+ /*
+ * Reject: at least one IP address is not listed in
+ * permit_mx_backup_networks.
+ */
+ if (msg_verbose)
+ msg_info("%s: address %s for %s does not match %s",
+ myname, hostaddr.buf, host, VAR_PERM_MX_NETWORKS);
+ } else {
+ msg_warn("%s: %s lookup error for address %s for %s",
+ myname, VAR_PERM_MX_NETWORKS, hostaddr.buf, host);
+ DEFER_IF_REJECT3(state, MAIL_ERROR_POLICY,
+ 450, "4.4.4",
+ "<%s>: %s rejected: Unable to verify host %s as mail exchanger",
+ reply_name, reply_class, host);
+ }
+ dns_rr_free(addr_list);
+ return (NOPE);
+ }
+ }
+ dns_rr_free(addr_list);
+ return (YUP);
+}
+
+/* has_my_addr - see if this host name lists one of my network addresses */
+
+static int has_my_addr(SMTPD_STATE *state, const char *host,
+ const char *reply_name, const char *reply_class)
+{
+ const char *myname = "has_my_addr";
+ struct addrinfo *res;
+ struct addrinfo *res0;
+ int aierr;
+ MAI_HOSTADDR_STR hostaddr;
+ INET_PROTO_INFO *proto_info = inet_proto_info();
+
+ if (msg_verbose)
+ msg_info("%s: host %s", myname, host);
+
+ /*
+ * If we can't lookup the host, defer rather than reject.
+ */
+#define YUP 1
+#define NOPE 0
+
+ aierr = hostname_to_sockaddr(host, (char *) 0, 0, &res0);
+ if (aierr) {
+ DEFER_IF_REJECT4(state, MAIL_ERROR_POLICY,
+ 450, "4.4.4",
+ "<%s>: %s rejected: Unable to look up mail exchanger host %s: %s",
+ reply_name, reply_class, host, MAI_STRERROR(aierr));
+ return (NOPE);
+ }
+#define HAS_MY_ADDR_RETURN(x) { freeaddrinfo(res0); return (x); }
+
+ for (res = res0; res != 0; res = res->ai_next) {
+ if (strchr((char *) proto_info->sa_family_list, res->ai_family) == 0) {
+ if (msg_verbose)
+ msg_info("skipping address family %d for host %s",
+ res->ai_family, host);
+ continue;
+ }
+ if (msg_verbose) {
+ SOCKADDR_TO_HOSTADDR(res->ai_addr, res->ai_addrlen,
+ &hostaddr, (MAI_SERVPORT_STR *) 0, 0);
+ msg_info("%s: addr %s", myname, hostaddr.buf);
+ }
+ if (own_inet_addr(res->ai_addr))
+ HAS_MY_ADDR_RETURN(YUP);
+ if (proxy_inet_addr(res->ai_addr))
+ HAS_MY_ADDR_RETURN(YUP);
+ }
+ if (msg_verbose)
+ msg_info("%s: host %s: no match", myname, host);
+
+ HAS_MY_ADDR_RETURN(NOPE);
+}
+
+/* i_am_mx - is this machine listed as MX relay */
+
+static int i_am_mx(SMTPD_STATE *state, DNS_RR *mx_list,
+ const char *reply_name, const char *reply_class)
+{
+ const char *myname = "i_am_mx";
+ DNS_RR *mx;
+
+ /*
+ * Compare hostnames first. Only if no name match is found, go through
+ * the trouble of host address lookups.
+ */
+ for (mx = mx_list; mx != 0; mx = mx->next) {
+ if (msg_verbose)
+ msg_info("%s: resolve hostname: %s", myname, (char *) mx->data);
+ if (resolve_local((char *) mx->data) > 0)
+ return (YUP);
+ /* if no match or error, match interface addresses instead. */
+ }
+
+ /*
+ * Argh. Do further DNS lookups and match interface addresses.
+ */
+ for (mx = mx_list; mx != 0; mx = mx->next) {
+ if (msg_verbose)
+ msg_info("%s: address lookup: %s", myname, (char *) mx->data);
+ if (has_my_addr(state, (char *) mx->data, reply_name, reply_class))
+ return (YUP);
+ }
+
+ /*
+ * This machine is not listed as MX relay.
+ */
+ if (msg_verbose)
+ msg_info("%s: I am not listed as MX relay", myname);
+ return (NOPE);
+}
+
+/* permit_mx_primary - authorize primary MX relays */
+
+static int permit_mx_primary(SMTPD_STATE *state, DNS_RR *mx_list,
+ const char *reply_name, const char *reply_class)
+{
+ const char *myname = "permit_mx_primary";
+ DNS_RR *mx;
+
+ if (msg_verbose)
+ msg_info("%s", myname);
+
+ /*
+ * See if each best MX host has all IP addresses in
+ * permit_mx_backup_networks.
+ */
+ for (mx = mx_list; mx != 0; mx = mx->next) {
+ if (!all_auth_mx_addr(state, (char *) mx->data, reply_name, reply_class))
+ return (NOPE);
+ }
+
+ /*
+ * All IP addresses of the best MX hosts are within
+ * permit_mx_backup_networks.
+ */
+ return (YUP);
+}
+
+/* permit_mx_backup - permit use of me as MX backup for recipient domain */
+
+static int permit_mx_backup(SMTPD_STATE *state, const char *recipient,
+ const char *reply_name, const char *reply_class)
+{
+ const char *myname = "permit_mx_backup";
+ const RESOLVE_REPLY *reply;
+ const char *domain;
+ const char *adomain;
+ DNS_RR *mx_list;
+ DNS_RR *middle;
+ DNS_RR *rest;
+ int dns_status;
+
+ if (msg_verbose)
+ msg_info("%s: %s", myname, recipient);
+
+ /*
+ * Resolve the address.
+ */
+ reply = smtpd_resolve_addr(state->sender, recipient);
+ if (reply->flags & RESOLVE_FLAG_FAIL)
+ reject_dict_retry(state, recipient);
+
+ /*
+ * For backwards compatibility, emulate permit_auth_destination. However,
+ * old permit_mx_backup implementations allow source routing with local
+ * address class.
+ */
+ if ((domain = strrchr(CONST_STR(reply->recipient), '@')) == 0)
+ return (SMTPD_CHECK_OK);
+ domain += 1;
+#if 0
+ if (reply->flags & RESOLVE_CLASS_LOCAL)
+ return (SMTPD_CHECK_OK);
+#endif
+ if (var_allow_untrust_route == 0 && (reply->flags & RESOLVE_FLAG_ROUTED))
+ return (SMTPD_CHECK_DUNNO);
+ if (reply->flags & RESOLVE_CLASS_FINAL)
+ return (SMTPD_CHECK_OK);
+ if (reply->flags & RESOLVE_CLASS_RELAY) {
+ if (warn_compat_break_relay_domains)
+ msg_info("using backwards-compatible default setting "
+ VAR_RELAY_DOMAINS "=$mydestination to accept mail "
+ "for domain \"%s\"", domain);
+ return (SMTPD_CHECK_OK);
+ }
+ if (msg_verbose)
+ msg_info("%s: not local: %s", myname, recipient);
+
+ /*
+ * Skip numerical forms that didn't match the local system.
+ */
+ if (domain[0] == '[' && domain[strlen(domain) - 1] == ']')
+ return (SMTPD_CHECK_DUNNO);
+
+ /*
+ * Fix 20140924: convert domain to ASCII.
+ */
+#ifndef NO_EAI
+ if (!allascii(domain) && (adomain = midna_domain_to_ascii(domain)) != 0) {
+ if (msg_verbose)
+ msg_info("%s asciified to %s", domain, adomain);
+ domain = adomain;
+ }
+#endif
+
+ /*
+ * Look up the list of MX host names for this domain. If no MX host is
+ * found, perhaps it is a CNAME for the local machine. Clients aren't
+ * supposed to send CNAMEs in SMTP commands, but it happens anyway. If we
+ * can't look up the destination, play safe and turn reject into defer.
+ */
+ dns_status = dns_lookup(domain, T_MX, 0, &mx_list,
+ (VSTRING *) 0, (VSTRING *) 0);
+#if 0
+ if (dns_status == DNS_NOTFOUND)
+ return (has_my_addr(state, domain, reply_name, reply_class) ?
+ SMTPD_CHECK_OK : SMTPD_CHECK_DUNNO);
+#endif
+ if (dns_status != DNS_OK) { /* incl. DNS_INVAL */
+ /* We don't special-case DNS_NULLMX. */
+ if (dns_status == DNS_RETRY || dns_status == DNS_POLICY)
+ DEFER_IF_REJECT3(state, MAIL_ERROR_POLICY,
+ 450, "4.4.4",
+ "<%s>: %s rejected: Unable to look up mail "
+ "exchanger information: %s",
+ reply_name, reply_class, dns_status == DNS_POLICY ?
+ "DNS reply filter policy" : dns_strerror(h_errno));
+ return (SMTPD_CHECK_DUNNO);
+ }
+
+ /*
+ * Separate MX list into primaries and backups.
+ */
+ mx_list = dns_rr_sort(mx_list, dns_rr_compare_pref_any);
+ for (middle = mx_list; /* see below */ ; middle = rest) {
+ rest = middle->next;
+ if (rest == 0)
+ break;
+ if (rest->pref != mx_list->pref) {
+ middle->next = 0;
+ break;
+ }
+ }
+ /* postcondition: middle->next = 0, rest may be 0. */
+
+#define PERMIT_MX_BACKUP_RETURN(x) do { \
+ middle->next = rest; \
+ dns_rr_free(mx_list); \
+ return (x); \
+ } while (0)
+
+ /*
+ * First, see if we match any of the primary MX servers.
+ */
+ if (i_am_mx(state, mx_list, reply_name, reply_class))
+ PERMIT_MX_BACKUP_RETURN(SMTPD_CHECK_DUNNO);
+
+ /*
+ * Then, see if we match any of the backup MX servers.
+ */
+ if (rest == 0 || !i_am_mx(state, rest, reply_name, reply_class))
+ PERMIT_MX_BACKUP_RETURN(SMTPD_CHECK_DUNNO);
+
+ /*
+ * Optionally, see if the primary MX hosts are in a restricted list of
+ * networks.
+ */
+ if (*var_perm_mx_networks
+ && !permit_mx_primary(state, mx_list, reply_name, reply_class))
+ PERMIT_MX_BACKUP_RETURN(SMTPD_CHECK_DUNNO);
+
+ /*
+ * The destination passed all requirements.
+ */
+ PERMIT_MX_BACKUP_RETURN(SMTPD_CHECK_OK);
+}
+
+/* reject_non_fqdn_address - fail if address is not in fqdn form */
+
+static int reject_non_fqdn_address(SMTPD_STATE *state, char *addr,
+ char *reply_name, char *reply_class)
+{
+ const char *myname = "reject_non_fqdn_address";
+ char *domain;
+ char *test_dom;
+ int stat;
+
+ if (msg_verbose)
+ msg_info("%s: %s", myname, addr);
+
+ /*
+ * Locate the domain information.
+ */
+ if ((domain = strrchr(addr, '@')) != 0)
+ domain++;
+ else
+ domain = "";
+
+ /*
+ * Skip forms that we can't handle yet.
+ */
+ if (domain[0] == '[' && domain[strlen(domain) - 1] == ']')
+ return (SMTPD_CHECK_DUNNO);
+
+ /*
+ * Truncate names ending in dot but not dot-dot.
+ */
+ test_dom = dup_if_truncate(domain);
+
+ /*
+ * Validate the domain. For backwards compatibility, permit non-ASCII
+ * names only when the client requested SMTPUTF8 support.
+ */
+ if (!*test_dom || !valid_utf8_hostname(state->flags & SMTPD_FLAG_SMTPUTF8,
+ test_dom, DONT_GRIPE) || !strchr(test_dom, '.'))
+ stat = smtpd_check_reject(state, MAIL_ERROR_POLICY,
+ var_non_fqdn_code, "4.5.2",
+ "<%s>: %s rejected: need fully-qualified address",
+ reply_name, reply_class);
+ else
+ stat = SMTPD_CHECK_DUNNO;
+
+ /*
+ * Cleanup.
+ */
+ if (test_dom != domain)
+ myfree(test_dom);
+
+ return (stat);
+}
+
+/* reject_unknown_address - fail if address does not resolve */
+
+static int reject_unknown_address(SMTPD_STATE *state, const char *addr,
+ const char *reply_name, const char *reply_class)
+{
+ const char *myname = "reject_unknown_address";
+ const RESOLVE_REPLY *reply;
+ const char *domain;
+
+ if (msg_verbose)
+ msg_info("%s: %s", myname, addr);
+
+ /*
+ * Resolve the address.
+ */
+ reply = smtpd_resolve_addr(strcmp(reply_class, SMTPD_NAME_SENDER) == 0 ?
+ state->recipient : state->sender, addr);
+ if (reply->flags & RESOLVE_FLAG_FAIL)
+ reject_dict_retry(state, addr);
+
+ /*
+ * Skip local destinations and non-DNS forms.
+ */
+ if ((domain = strrchr(CONST_STR(reply->recipient), '@')) == 0)
+ return (SMTPD_CHECK_DUNNO);
+ domain += 1;
+ if (reply->flags & RESOLVE_CLASS_FINAL)
+ return (SMTPD_CHECK_DUNNO);
+ if (domain[0] == '[' && domain[strlen(domain) - 1] == ']')
+ return (SMTPD_CHECK_DUNNO);
+
+ /*
+ * Look up the name in the DNS.
+ */
+ return (reject_unknown_mailhost(state, domain, reply_name, reply_class));
+}
+
+/* reject_unverified_address - fail if address bounces */
+
+static int reject_unverified_address(SMTPD_STATE *state, const char *addr,
+ const char *reply_name, const char *reply_class,
+ int unv_addr_dcode, int unv_addr_rcode,
+ int unv_addr_tf_act,
+ const char *alt_reply)
+{
+ const char *myname = "reject_unverified_address";
+ VSTRING *why = vstring_alloc(10);
+ int rqst_status = SMTPD_CHECK_DUNNO;
+ int rcpt_status;
+ int verify_status;
+ int count;
+ int reject_code = 0;
+
+ if (msg_verbose)
+ msg_info("%s: %s", myname, addr);
+
+ /*
+ * Verify the address. Don't waste too much of their or our time.
+ */
+ for (count = 0; /* see below */ ; /* see below */ ) {
+ verify_status = verify_clnt_query(addr, &rcpt_status, why);
+ if (verify_status != VRFY_STAT_OK || rcpt_status != DEL_RCPT_STAT_TODO)
+ break;
+ if (++count >= var_verify_poll_count)
+ break;
+ sleep(var_verify_poll_delay);
+ }
+ if (verify_status != VRFY_STAT_OK) {
+ msg_warn("%s service failure", var_verify_service);
+ rqst_status =
+ DEFER_IF_PERMIT2(unv_addr_tf_act, state, MAIL_ERROR_POLICY,
+ 450, strcmp(reply_class, SMTPD_NAME_SENDER) == 0 ?
+ SND_DSN : "4.1.1",
+ "<%s>: %s rejected: address verification problem",
+ reply_name, reply_class);
+ } else {
+ switch (rcpt_status) {
+ default:
+ msg_warn("unknown address verification status %d", rcpt_status);
+ break;
+ case DEL_RCPT_STAT_TODO:
+ case DEL_RCPT_STAT_DEFER:
+ reject_code = unv_addr_dcode;
+ break;
+ case DEL_RCPT_STAT_OK:
+ break;
+ case DEL_RCPT_STAT_BOUNCE:
+ reject_code = unv_addr_rcode;
+ break;
+ }
+ if (reject_code >= 400 && *alt_reply)
+ vstring_strcpy(why, alt_reply);
+ switch (reject_code / 100) {
+ case 2:
+ break;
+ case 4:
+ rqst_status =
+ DEFER_IF_PERMIT3(unv_addr_tf_act, state, MAIL_ERROR_POLICY,
+ reject_code,
+ strcmp(reply_class, SMTPD_NAME_SENDER) == 0 ?
+ SND_DSN : "4.1.1",
+ "<%s>: %s rejected: unverified address: %.250s",
+ reply_name, reply_class, STR(why));
+ break;
+ default:
+ if (reject_code != 0)
+ rqst_status =
+ smtpd_check_reject(state, MAIL_ERROR_POLICY,
+ reject_code,
+ strcmp(reply_class, SMTPD_NAME_SENDER) == 0 ?
+ SND_DSN : "4.1.1",
+ "<%s>: %s rejected: undeliverable address: %s",
+ reply_name, reply_class, STR(why));
+ break;
+ }
+ }
+ vstring_free(why);
+ return (rqst_status);
+}
+
+/* can_delegate_action - can we delegate this to the cleanup server */
+
+#ifndef TEST
+
+static int not_in_client_helo(SMTPD_STATE *, const char *, const char *, const char *);
+
+static int can_delegate_action(SMTPD_STATE *state, const char *table,
+ const char *action, const char *reply_class)
+{
+
+ /*
+ * If we're not using the cleanup server, then there is no way that we
+ * can support actions such as FILTER or HOLD that are delegated to the
+ * cleanup server.
+ */
+ if (USE_SMTPD_PROXY(state)) {
+ msg_warn("access table %s: with %s specified, action %s is unavailable",
+ table, VAR_SMTPD_PROXY_FILT, action);
+ return (0);
+ }
+
+ /*
+ * ETRN does not receive mail so we can't store queue file records.
+ */
+ if (strcmp(state->where, SMTPD_CMD_ETRN) == 0) {
+ msg_warn("access table %s: action %s is unavailable in %s",
+ table, action, VAR_ETRN_CHECKS);
+ return (0);
+ }
+ return (not_in_client_helo(state, table, action, reply_class));
+}
+
+/* not_in_client_helo - not in client or helo restriction context */
+
+static int not_in_client_helo(SMTPD_STATE *state, const char *table,
+ const char *action,
+ const char *unused_reply_class)
+{
+
+ /*
+ * If delay_reject=no, then client and helo restrictions take effect
+ * immediately, outside any particular mail transaction context. For
+ * example, rejecting HELO does not affect subsequent mail deliveries.
+ * Thus, if delay_reject=no, client and helo actions such as FILTER or
+ * HOLD also should not affect subsequent mail deliveries. Hmm...
+ *
+ * XXX If the MAIL FROM command is rejected then we have to reset access map
+ * side effects such as FILTER.
+ */
+ if (state->sender == 0) {
+ msg_warn("access table %s: with %s=%s, "
+ "action %s is always skipped in %s or %s restrictions",
+ table, VAR_SMTPD_DELAY_REJECT, CONFIG_BOOL_NO,
+ action, SMTPD_NAME_CLIENT, SMTPD_NAME_HELO);
+ /* XXX What about ETRN? */
+ return (0);
+ }
+ return (1);
+}
+
+#endif
+
+/* check_table_result - translate table lookup result into pass/reject */
+
+static int check_table_result(SMTPD_STATE *state, const char *table,
+ const char *value, const char *datum,
+ const char *reply_name,
+ const char *reply_class,
+ const char *def_acl)
+{
+ const char *myname = "check_table_result";
+ int code;
+ ARGV *restrictions;
+ jmp_buf savebuf;
+ int status;
+ const char *cmd_text;
+ int cmd_len;
+ static char def_dsn[] = "5.7.1";
+ DSN_SPLIT dp;
+ static VSTRING *buf;
+
+#ifdef DELAY_ACTION
+ int defer_delay;
+
+#endif
+
+ if (buf == 0)
+ buf = vstring_alloc(10);
+
+ /*
+ * Parse into command and text. Do not change the input.
+ */
+ cmd_text = value + strcspn(value, " \t");
+ cmd_len = cmd_text - value;
+ vstring_strncpy(buf, value, cmd_len);
+ while (*cmd_text && ISSPACE(*cmd_text))
+ cmd_text++;
+
+ if (msg_verbose)
+ msg_info("%s: %s %s %s", myname, table, value, datum);
+
+#define STREQUAL(x,y,l) (strncasecmp((x), (y), (l)) == 0 && (y)[l] == 0)
+
+ /*
+ * DUNNO means skip this table. Silently ignore optional text.
+ */
+ if (STREQUAL(value, "DUNNO", cmd_len))
+ return (SMTPD_CHECK_DUNNO);
+
+ /*
+ * REJECT means NO. Use optional text or generate a generic error
+ * response.
+ */
+ if (STREQUAL(value, "REJECT", cmd_len)) {
+ dsn_split(&dp, "5.7.1", cmd_text);
+ return (smtpd_check_reject(state, MAIL_ERROR_POLICY,
+ var_map_reject_code,
+ smtpd_dsn_fix(DSN_STATUS(dp.dsn),
+ reply_class),
+ "<%s>: %s rejected: %s",
+ reply_name, reply_class,
+ *dp.text ? dp.text : "Access denied"));
+ }
+
+ /*
+ * DEFER means "try again". Use optional text or generate a generic error
+ * response.
+ */
+ if (STREQUAL(value, "DEFER", cmd_len)) {
+ dsn_split(&dp, "4.7.1", cmd_text);
+ return (smtpd_check_reject(state, MAIL_ERROR_POLICY,
+ var_map_defer_code,
+ smtpd_dsn_fix(DSN_STATUS(dp.dsn),
+ reply_class),
+ "<%s>: %s rejected: %s",
+ reply_name, reply_class,
+ *dp.text ? dp.text : "Access denied"));
+ }
+#ifndef SHUT_RDWR
+#define SHUT_RDWR 2
+#endif
+
+ /*
+ * HANGUP. Text is optional. Drop the connection without sending any
+ * reply.
+ *
+ * Note: this is an unsupported test feature. No attempt is made to maintain
+ * compatibility between successive versions.
+ */
+ if (STREQUAL(value, "HANGUP", cmd_len)) {
+ shutdown(vstream_fileno(state->client), SHUT_RDWR);
+ log_whatsup(state, "hangup", cmd_text);
+ vstream_longjmp(state->client, SMTP_ERR_QUIET);
+ }
+
+ /*
+ * INFO. Text is optional.
+ */
+ if (STREQUAL(value, "INFO", cmd_len)) {
+ log_whatsup(state, "info", cmd_text);
+ return (SMTPD_CHECK_DUNNO);
+ }
+
+ /*
+ * WARN. Text is optional.
+ */
+ if (STREQUAL(value, "WARN", cmd_len)) {
+ log_whatsup(state, "warn", cmd_text);
+ return (SMTPD_CHECK_DUNNO);
+ }
+
+ /*
+ * FILTER means deliver to content filter. But we may still change our
+ * mind, and reject/discard the message for other reasons.
+ */
+ if (STREQUAL(value, "FILTER", cmd_len)) {
+#ifndef TEST
+ if (can_delegate_action(state, table, "FILTER", reply_class) == 0)
+ return (SMTPD_CHECK_DUNNO);
+#endif
+ if (*cmd_text == 0) {
+ msg_warn("access table %s entry \"%s\" has FILTER entry without value",
+ table, datum);
+ return (SMTPD_CHECK_DUNNO);
+ } else if (strchr(cmd_text, ':') == 0) {
+ msg_warn("access table %s entry \"%s\" requires transport:destination",
+ table, datum);
+ return (SMTPD_CHECK_DUNNO);
+ } else {
+ vstring_sprintf(error_text, "<%s>: %s triggers FILTER %s",
+ reply_name, reply_class, cmd_text);
+ log_whatsup(state, "filter", STR(error_text));
+#ifndef TEST
+ UPDATE_STRING(state->saved_filter, cmd_text);
+#endif
+ return (SMTPD_CHECK_DUNNO);
+ }
+ }
+
+ /*
+ * HOLD means deliver later. But we may still change our mind, and
+ * reject/discard the message for other reasons.
+ */
+ if (STREQUAL(value, "HOLD", cmd_len)) {
+#ifndef TEST
+ if (can_delegate_action(state, table, "HOLD", reply_class) == 0
+ || (state->saved_flags & CLEANUP_FLAG_HOLD))
+ return (SMTPD_CHECK_DUNNO);
+#endif
+ vstring_sprintf(error_text, "<%s>: %s %s", reply_name, reply_class,
+ *cmd_text ? cmd_text : "triggers HOLD action");
+ log_whatsup(state, "hold", STR(error_text));
+#ifndef TEST
+ state->saved_flags |= CLEANUP_FLAG_HOLD;
+#endif
+ return (SMTPD_CHECK_DUNNO);
+ }
+
+ /*
+ * DELAY means deliver later. But we may still change our mind, and
+ * reject/discard the message for other reasons.
+ *
+ * This feature is deleted because it has too many problems. 1) It does not
+ * work on some remote file systems; 2) mail will be delivered anyway
+ * with "sendmail -q" etc.; 3) while the mail is queued it bogs down the
+ * deferred queue scan with huge amounts of useless disk I/O operations.
+ */
+#ifdef DELAY_ACTION
+ if (STREQUAL(value, "DELAY", cmd_len)) {
+#ifndef TEST
+ if (can_delegate_action(state, table, "DELAY", reply_class) == 0)
+ return (SMTPD_CHECK_DUNNO);
+#endif
+ if (*cmd_text == 0) {
+ msg_warn("access table %s entry \"%s\" has DELAY entry without value",
+ table, datum);
+ return (SMTPD_CHECK_DUNNO);
+ }
+ if (conv_time(cmd_text, &defer_delay, 's') == 0) {
+ msg_warn("access table %s entry \"%s\" has invalid DELAY argument \"%s\"",
+ table, datum, cmd_text);
+ return (SMTPD_CHECK_DUNNO);
+ }
+ vstring_sprintf(error_text, "<%s>: %s %s", reply_name, reply_class,
+ *cmd_text ? cmd_text : "triggers DELAY action");
+ log_whatsup(state, "delay", STR(error_text));
+#ifndef TEST
+ state->saved_delay = defer_delay;
+#endif
+ return (SMTPD_CHECK_DUNNO);
+ }
+#endif
+
+ /*
+ * DISCARD means silently discard and claim successful delivery.
+ */
+ if (STREQUAL(value, "DISCARD", cmd_len)) {
+#ifndef TEST
+ if (can_delegate_action(state, table, "DISCARD", reply_class) == 0)
+ return (SMTPD_CHECK_DUNNO);
+#endif
+ vstring_sprintf(error_text, "<%s>: %s %s", reply_name, reply_class,
+ *cmd_text ? cmd_text : "triggers DISCARD action");
+ log_whatsup(state, "discard", STR(error_text));
+#ifndef TEST
+ state->saved_flags |= CLEANUP_FLAG_DISCARD;
+ state->discard = 1;
+#endif
+ return (smtpd_acl_permit(state, STR(buf), reply_class, reply_name,
+ "from %s", table));
+ }
+
+ /*
+ * REDIRECT means deliver to designated recipient. But we may still
+ * change our mind, and reject/discard the message for other reasons.
+ */
+ if (STREQUAL(value, "REDIRECT", cmd_len)) {
+#ifndef TEST
+ if (can_delegate_action(state, table, "REDIRECT", reply_class) == 0)
+ return (SMTPD_CHECK_DUNNO);
+#endif
+ if (strchr(cmd_text, '@') == 0) {
+ msg_warn("access table %s entry \"%s\" requires user@domain target",
+ table, datum);
+ return (SMTPD_CHECK_DUNNO);
+ } else {
+ vstring_sprintf(error_text, "<%s>: %s triggers REDIRECT %s",
+ reply_name, reply_class, cmd_text);
+ log_whatsup(state, "redirect", STR(error_text));
+#ifndef TEST
+ UPDATE_STRING(state->saved_redirect, cmd_text);
+#endif
+ return (SMTPD_CHECK_DUNNO);
+ }
+ }
+
+ /*
+ * BCC means deliver to designated recipient. But we may still change our
+ * mind, and reject/discard the message for other reasons.
+ */
+ if (STREQUAL(value, "BCC", cmd_len)) {
+#ifndef TEST
+ if (can_delegate_action(state, table, "BCC", reply_class) == 0)
+ return (SMTPD_CHECK_DUNNO);
+#endif
+ if (strchr(cmd_text, '@') == 0) {
+ msg_warn("access table %s entry \"%s\" requires user@domain target",
+ table, datum);
+ return (SMTPD_CHECK_DUNNO);
+ } else {
+ vstring_sprintf(error_text, "<%s>: %s triggers BCC %s",
+ reply_name, reply_class, cmd_text);
+ log_whatsup(state, "bcc", STR(error_text));
+#ifndef TEST
+ if (state->saved_bcc == 0)
+ state->saved_bcc = argv_alloc(1);
+ argv_add(state->saved_bcc, cmd_text, (char *) 0);
+#endif
+ return (SMTPD_CHECK_DUNNO);
+ }
+ }
+
+ /*
+ * DEFER_IF_PERMIT changes "permit" into "maybe". Use optional text or
+ * generate a generic error response.
+ */
+ if (STREQUAL(value, DEFER_IF_PERMIT, cmd_len)) {
+ dsn_split(&dp, "4.7.1", cmd_text);
+ return (DEFER_IF_PERMIT3(DEFER_IF_PERMIT_ACT, state, MAIL_ERROR_POLICY,
+ var_map_defer_code,
+ smtpd_dsn_fix(DSN_STATUS(dp.dsn), reply_class),
+ "<%s>: %s rejected: %s",
+ reply_name, reply_class,
+ *dp.text ? dp.text : "Service unavailable"));
+ }
+
+ /*
+ * DEFER_IF_REJECT changes "reject" into "maybe". Use optional text or
+ * generate a generic error response.
+ */
+ if (STREQUAL(value, DEFER_IF_REJECT, cmd_len)) {
+ dsn_split(&dp, "4.7.1", cmd_text);
+ DEFER_IF_REJECT3(state, MAIL_ERROR_POLICY,
+ var_map_defer_code,
+ smtpd_dsn_fix(DSN_STATUS(dp.dsn), reply_class),
+ "<%s>: %s rejected: %s",
+ reply_name, reply_class,
+ *dp.text ? dp.text : "Service unavailable");
+ return (SMTPD_CHECK_DUNNO);
+ }
+
+ /*
+ * PREPEND prepends the specified message header text.
+ */
+ if (STREQUAL(value, "PREPEND", cmd_len)) {
+#ifndef TEST
+ /* XXX what about ETRN. */
+ if (not_in_client_helo(state, table, "PREPEND", reply_class) == 0)
+ return (SMTPD_CHECK_DUNNO);
+#endif
+ if (strcmp(state->where, SMTPD_AFTER_EOM) == 0) {
+ msg_warn("access table %s: action PREPEND must be used before %s",
+ table, VAR_EOD_CHECKS);
+ return (SMTPD_CHECK_DUNNO);
+ }
+ if (*cmd_text == 0 || is_header(cmd_text) == 0) {
+ msg_warn("access table %s entry \"%s\" requires header: text",
+ table, datum);
+ return (SMTPD_CHECK_DUNNO);
+ } else {
+ if (state->prepend == 0)
+ state->prepend = argv_alloc(1);
+ argv_add(state->prepend, cmd_text, (char *) 0);
+ return (SMTPD_CHECK_DUNNO);
+ }
+ }
+
+ /*
+ * All-numeric result probably means OK - some out-of-band authentication
+ * mechanism uses this as time stamp.
+ */
+ if (alldig(value))
+ return (smtpd_acl_permit(state, STR(buf), reply_class, reply_name,
+ "from %s", table));
+
+ /*
+ * 4xx or 5xx means NO as well. smtpd_check_reject() will validate the
+ * response status code.
+ *
+ * If the caller specifies an RFC 3463 enhanced status code, put it
+ * immediately after the SMTP status code as described in RFC 2034.
+ */
+ if (cmd_len == 3 && *cmd_text
+ && (value[0] == '4' || value[0] == '5')
+ && ISDIGIT(value[1]) && ISDIGIT(value[2])) {
+ code = atoi(value);
+ def_dsn[0] = value[0];
+ dsn_split(&dp, def_dsn, cmd_text);
+ return (smtpd_check_reject(state, MAIL_ERROR_POLICY,
+ code,
+ smtpd_dsn_fix(DSN_STATUS(dp.dsn),
+ reply_class),
+ "<%s>: %s rejected: %s",
+ reply_name, reply_class,
+ *dp.text ? dp.text : "Access denied"));
+ }
+
+ /*
+ * OK or RELAY means YES. Ignore trailing text.
+ */
+ if (STREQUAL(value, "OK", cmd_len) || STREQUAL(value, "RELAY", cmd_len))
+ return (smtpd_acl_permit(state, STR(buf), reply_class, reply_name,
+ "from %s", table));
+
+ /*
+ * Unfortunately, maps must be declared ahead of time so they can be
+ * opened before we go to jail. We could insist that the RHS can only
+ * contain a pre-defined restriction class name, but that would be too
+ * restrictive. Instead we warn if an access table references any map.
+ *
+ * XXX Don't use passwd files or address rewriting maps as access tables.
+ */
+ if (strchr(value, ':') != 0) {
+ msg_warn("access table %s has entry with lookup table: %s",
+ table, value);
+ msg_warn("do not specify lookup tables inside SMTPD access maps");
+ msg_warn("define a restriction class and specify its name instead.");
+ reject_server_error(state);
+ }
+
+ /*
+ * Don't get carried away with recursion.
+ */
+ if (state->recursion > 100) {
+ msg_warn("access table %s entry %s causes unreasonable recursion",
+ table, value);
+ reject_server_error(state);
+ }
+
+ /*
+ * Recursively evaluate the restrictions given in the right-hand side. In
+ * the dark ages, an empty right-hand side meant OK. Make some
+ * discouraging comments.
+ *
+ * XXX Jump some hoops to avoid a minute memory leak in case of a file
+ * configuration error.
+ */
+#define ADDROF(x) ((char *) &(x))
+
+ restrictions = argv_splitq(value, CHARS_COMMA_SP, CHARS_BRACE);
+ memcpy(ADDROF(savebuf), ADDROF(smtpd_check_buf), sizeof(savebuf));
+ status = setjmp(smtpd_check_buf);
+ if (status != 0) {
+ argv_free(restrictions);
+ memcpy(ADDROF(smtpd_check_buf), ADDROF(savebuf),
+ sizeof(smtpd_check_buf));
+ longjmp(smtpd_check_buf, status);
+ }
+ if (restrictions->argc == 0) {
+ msg_warn("access table %s entry %s has empty value",
+ table, value);
+ status = SMTPD_CHECK_OK;
+ } else {
+ status = generic_checks(state, restrictions, reply_name,
+ reply_class, def_acl);
+ }
+ argv_free(restrictions);
+ memcpy(ADDROF(smtpd_check_buf), ADDROF(savebuf), sizeof(smtpd_check_buf));
+ return (status);
+}
+
+/* check_access - table lookup without substring magic */
+
+static int check_access(SMTPD_STATE *state, const char *table, const char *name,
+ int flags, int *found, const char *reply_name,
+ const char *reply_class, const char *def_acl)
+{
+ const char *myname = "check_access";
+ const char *value;
+ MAPS *maps;
+
+#define CHK_ACCESS_RETURN(x,y) \
+ { *found = y; return(x); }
+#define FULL 0
+#define PARTIAL DICT_FLAG_FIXED
+#define FOUND 1
+#define MISSED 0
+
+ if (msg_verbose)
+ msg_info("%s: %s", myname, name);
+
+ if ((maps = (MAPS *) htable_find(map_command_table, table)) == 0) {
+ msg_warn("%s: unexpected dictionary: %s", myname, table);
+ value = "451 4.3.5 Server configuration error";
+ CHK_ACCESS_RETURN(check_table_result(state, table, value, name,
+ reply_name, reply_class,
+ def_acl), FOUND);
+ }
+ if ((value = maps_find(maps, name, flags)) != 0)
+ CHK_ACCESS_RETURN(check_table_result(state, table, value, name,
+ reply_name, reply_class,
+ def_acl), FOUND);
+ if (maps->error != 0) {
+ /* Warning is already logged. */
+ value = "451 4.3.5 Server configuration error";
+ CHK_ACCESS_RETURN(check_table_result(state, table, value, name,
+ reply_name, reply_class,
+ def_acl), FOUND);
+ }
+ CHK_ACCESS_RETURN(SMTPD_CHECK_DUNNO, MISSED);
+}
+
+/* check_domain_access - domainname-based table lookup */
+
+static int check_domain_access(SMTPD_STATE *state, const char *table,
+ const char *domain, int flags,
+ int *found, const char *reply_name,
+ const char *reply_class,
+ const char *def_acl)
+{
+ const char *myname = "check_domain_access";
+ const char *name;
+ const char *next;
+ const char *value;
+ MAPS *maps;
+ int maybe_numerical = 1;
+
+ if (msg_verbose)
+ msg_info("%s: %s", myname, domain);
+
+ /*
+ * Try the name and its parent domains. Including top-level domains.
+ *
+ * Helo names can end in ".". The test below avoids lookups of the empty
+ * key, because Berkeley DB cannot deal with it. [Victor Duchovni, Morgan
+ * Stanley].
+ *
+ * TODO(wietse) move to mail_domain_find library module.
+ */
+#define CHK_DOMAIN_RETURN(x,y) { *found = y; return(x); }
+
+ if ((maps = (MAPS *) htable_find(map_command_table, table)) == 0) {
+ msg_warn("%s: unexpected dictionary: %s", myname, table);
+ value = "451 4.3.5 Server configuration error";
+ CHK_DOMAIN_RETURN(check_table_result(state, table, value,
+ domain, reply_name, reply_class,
+ def_acl), FOUND);
+ }
+ for (name = domain; *name != 0; name = next) {
+ if ((value = maps_find(maps, name, flags)) != 0)
+ CHK_DOMAIN_RETURN(check_table_result(state, table, value,
+ domain, reply_name, reply_class,
+ def_acl), FOUND);
+ if (maps->error != 0) {
+ /* Warning is already logged. */
+ value = "451 4.3.5 Server configuration error";
+ CHK_DOMAIN_RETURN(check_table_result(state, table, value,
+ domain, reply_name, reply_class,
+ def_acl), FOUND);
+ }
+ /* Don't apply subdomain magic to numerical hostnames. */
+ if (maybe_numerical
+ && (maybe_numerical = valid_hostaddr(domain, DONT_GRIPE)) != 0)
+ break;
+ if ((next = strchr(name + 1, '.')) == 0)
+ break;
+ if (access_parent_style == MATCH_FLAG_PARENT)
+ next += 1;
+ flags = PARTIAL;
+ }
+ CHK_DOMAIN_RETURN(SMTPD_CHECK_DUNNO, MISSED);
+}
+
+/* check_addr_access - address-based table lookup */
+
+static int check_addr_access(SMTPD_STATE *state, const char *table,
+ const char *address, int flags,
+ int *found, const char *reply_name,
+ const char *reply_class,
+ const char *def_acl)
+{
+ const char *myname = "check_addr_access";
+ char *addr;
+ const char *value;
+ MAPS *maps;
+ int delim;
+
+ if (msg_verbose)
+ msg_info("%s: %s", myname, address);
+
+ /*
+ * Try the address and its parent networks.
+ *
+ * TODO(wietse) move to mail_ipaddr_find library module.
+ */
+#define CHK_ADDR_RETURN(x,y) { *found = y; return(x); }
+
+ addr = STR(vstring_strcpy(error_text, address));
+#ifdef HAS_IPV6
+ if (strchr(addr, ':') != 0)
+ delim = ':';
+ else
+#endif
+ delim = '.';
+
+ if ((maps = (MAPS *) htable_find(map_command_table, table)) == 0) {
+ msg_warn("%s: unexpected dictionary: %s", myname, table);
+ value = "451 4.3.5 Server configuration error";
+ CHK_ADDR_RETURN(check_table_result(state, table, value, address,
+ reply_name, reply_class,
+ def_acl), FOUND);
+ }
+ do {
+ if ((value = maps_find(maps, addr, flags)) != 0)
+ CHK_ADDR_RETURN(check_table_result(state, table, value, address,
+ reply_name, reply_class,
+ def_acl), FOUND);
+ if (maps->error != 0) {
+ /* Warning is already logged. */
+ value = "451 4.3.5 Server configuration error";
+ CHK_ADDR_RETURN(check_table_result(state, table, value, address,
+ reply_name, reply_class,
+ def_acl), FOUND);
+ }
+ flags = PARTIAL;
+ } while (split_at_right(addr, delim));
+
+ CHK_ADDR_RETURN(SMTPD_CHECK_DUNNO, MISSED);
+}
+
+/* check_namadr_access - OK/FAIL based on host name/address lookup */
+
+static int check_namadr_access(SMTPD_STATE *state, const char *table,
+ const char *name, const char *addr,
+ int flags, int *found,
+ const char *reply_name,
+ const char *reply_class,
+ const char *def_acl)
+{
+ const char *myname = "check_namadr_access";
+ int status;
+
+ if (msg_verbose)
+ msg_info("%s: name %s addr %s", myname, name, addr);
+
+ /*
+ * Look up the host name, or parent domains thereof. XXX A domain
+ * wildcard may pre-empt a more specific address table entry.
+ */
+ if ((status = check_domain_access(state, table, name, flags,
+ found, reply_name, reply_class,
+ def_acl)) != 0 || *found)
+ return (status);
+
+ /*
+ * Look up the network address, or parent networks thereof.
+ */
+ if ((status = check_addr_access(state, table, addr, flags,
+ found, reply_name, reply_class,
+ def_acl)) != 0 || *found)
+ return (status);
+
+ /*
+ * Undecided when the host was not found.
+ */
+ return (SMTPD_CHECK_DUNNO);
+}
+
+/* check_server_access - access control by server host name or address */
+
+static int check_server_access(SMTPD_STATE *state, const char *table,
+ const char *name,
+ int type,
+ const char *reply_name,
+ const char *reply_class,
+ const char *def_acl)
+{
+ const char *myname = "check_server_access";
+ const char *domain;
+ const char *adomain;
+ int dns_status;
+ DNS_RR *server_list;
+ DNS_RR *server;
+ int found = 0;
+ MAI_HOSTADDR_STR addr_string;
+ int aierr;
+ struct addrinfo *res0;
+ struct addrinfo *res;
+ int status;
+ INET_PROTO_INFO *proto_info;
+
+ /*
+ * Sanity check.
+ */
+ if (type != T_MX && type != T_NS && type != T_A
+#ifdef HAS_IPV6
+ && type != T_AAAA
+#endif
+ )
+ msg_panic("%s: unexpected resource type \"%s\" in request",
+ myname, dns_strtype(type));
+
+ if (msg_verbose)
+ msg_info("%s: %s %s", myname, dns_strtype(type), name);
+
+ /*
+ * Skip over local-part.
+ */
+ if ((domain = strrchr(name, '@')) != 0)
+ domain += 1;
+ else
+ domain = name;
+
+ /*
+ * Treat an address literal as its own MX server, just like we treat a
+ * name without MX record as its own MX server. There is, however, no
+ * applicable NS server equivalent.
+ */
+ if (*domain == '[') {
+ char *saved_addr;
+ const char *bare_addr;
+ ssize_t len;
+
+ if (type != T_A && type != T_MX)
+ return (SMTPD_CHECK_DUNNO);
+ len = strlen(domain);
+ if (domain[len - 1] != ']')
+ return (SMTPD_CHECK_DUNNO);
+ /* Memory leak alert: no early returns after this point. */
+ saved_addr = mystrndup(domain + 1, len - 2);
+ if ((bare_addr = valid_mailhost_addr(saved_addr, DONT_GRIPE)) == 0)
+ status = SMTPD_CHECK_DUNNO;
+ else
+ status = check_addr_access(state, table, bare_addr, FULL,
+ &found, reply_name, reply_class,
+ def_acl);
+ myfree(saved_addr);
+ return (status);
+ }
+
+ /*
+ * Fix 20140924: convert domain to ASCII.
+ */
+#ifndef NO_EAI
+ if (!allascii(domain) && (adomain = midna_domain_to_ascii(domain)) != 0) {
+ if (msg_verbose)
+ msg_info("%s asciified to %s", domain, adomain);
+ domain = adomain;
+ }
+#endif
+
+ /*
+ * If the request is type A or AAAA, fabricate an MX record that points
+ * to the domain name itself, and skip name-based access control.
+ *
+ * If the domain name does not exist then we apply no restriction.
+ *
+ * If the domain name exists but no MX record exists, fabricate an MX record
+ * that points to the domain name itself.
+ *
+ * If the domain name exists but no NS record exists, look up parent domain
+ * NS records.
+ *
+ * XXX 20150707 Work around broken DNS servers that reply with NXDOMAIN
+ * instead of "no data".
+ */
+ if (type == T_A
+#ifdef HAS_IPV6
+ || type == T_AAAA
+#endif
+ ) {
+ server_list = dns_rr_create(domain, domain, T_MX, C_IN, 0, 0,
+ domain, strlen(domain) + 1);
+ } else {
+ dns_status = dns_lookup(domain, type, 0, &server_list,
+ (VSTRING *) 0, (VSTRING *) 0);
+ if (dns_status == DNS_NULLMX)
+ return (SMTPD_CHECK_DUNNO);
+ if (dns_status == DNS_NOTFOUND /* Not: h_errno == NO_DATA */ ) {
+ if (type == T_MX) {
+ server_list = dns_rr_create(domain, domain, type, C_IN, 0, 0,
+ domain, strlen(domain) + 1);
+ dns_status = DNS_OK;
+ } else if (type == T_NS /* && h_errno == NO_DATA */ ) {
+ while ((domain = strchr(domain, '.')) != 0 && domain[1]) {
+ domain += 1;
+ dns_status = dns_lookup(domain, type, 0, &server_list,
+ (VSTRING *) 0, (VSTRING *) 0);
+ if (dns_status != DNS_NOTFOUND /* || h_errno != NO_DATA */ )
+ break;
+ }
+ }
+ }
+ if (dns_status != DNS_OK) {
+ msg_warn("Unable to look up %s host for %s: %s", dns_strtype(type),
+ domain && domain[1] ? domain : name, dns_status == DNS_POLICY ?
+ "DNS reply filter policy" : dns_strerror(h_errno));
+ return (SMTPD_CHECK_DUNNO);
+ }
+ }
+
+ /*
+ * No bare returns after this point or we have a memory leak.
+ */
+#define CHECK_SERVER_RETURN(x) { dns_rr_free(server_list); return(x); }
+
+ /*
+ * Check the hostnames first, then the addresses.
+ */
+ proto_info = inet_proto_info();
+ for (server = server_list; server != 0; server = server->next) {
+ if (msg_verbose)
+ msg_info("%s: %s hostname check: %s",
+ myname, dns_strtype(type), (char *) server->data);
+ if (valid_hostaddr((char *) server->data, DONT_GRIPE)) {
+ if ((status = check_addr_access(state, table, (char *) server->data,
+ FULL, &found, reply_name, reply_class,
+ def_acl)) != 0 || found)
+ CHECK_SERVER_RETURN(status);
+ continue;
+ }
+ if (type != T_A && type != T_AAAA
+ && ((status = check_domain_access(state, table, (char *) server->data,
+ FULL, &found, reply_name, reply_class,
+ def_acl)) != 0 || found))
+ CHECK_SERVER_RETURN(status);
+ if ((aierr = hostname_to_sockaddr((char *) server->data,
+ (char *) 0, 0, &res0)) != 0) {
+ if (type != T_A && type != T_AAAA)
+ msg_warn("Unable to look up %s host %s for %s %s: %s",
+ dns_strtype(type), (char *) server->data,
+ reply_class, reply_name, MAI_STRERROR(aierr));
+ continue;
+ }
+ /* Now we must also free the addrinfo result. */
+ if (msg_verbose)
+ msg_info("%s: %s host address check: %s",
+ myname, dns_strtype(type), (char *) server->data);
+ for (res = res0; res != 0; res = res->ai_next) {
+ if (strchr((char *) proto_info->sa_family_list, res->ai_family) == 0) {
+ if (msg_verbose)
+ msg_info("skipping address family %d for host %s",
+ res->ai_family, server->data);
+ continue;
+ }
+ SOCKADDR_TO_HOSTADDR(res->ai_addr, res->ai_addrlen,
+ &addr_string, (MAI_SERVPORT_STR *) 0, 0);
+ status = check_addr_access(state, table, addr_string.buf, FULL,
+ &found, reply_name, reply_class,
+ def_acl);
+ if (status != 0 || found) {
+ freeaddrinfo(res0); /* 200412 */
+ CHECK_SERVER_RETURN(status);
+ }
+ }
+ freeaddrinfo(res0); /* 200412 */
+ }
+ CHECK_SERVER_RETURN(SMTPD_CHECK_DUNNO);
+}
+
+/* check_ccert_access - access for TLS clients by certificate fingerprint */
+
+
+static int check_ccert_access(SMTPD_STATE *state, const char *table,
+ const char *def_acl)
+{
+ int result = SMTPD_CHECK_DUNNO;
+
+#ifdef USE_TLS
+ const char *myname = "check_ccert_access";
+ int found;
+
+ /*
+ * When directly checking the fingerprint, it is OK if the issuing CA is
+ * not trusted.
+ */
+ if (TLS_CERT_IS_PRESENT(state->tls_context)) {
+ int i;
+ char *prints[2];
+
+ prints[0] = state->tls_context->peer_cert_fprint;
+ prints[1] = state->tls_context->peer_pkey_fprint;
+
+ for (i = 0; i < 2; ++i) {
+ if (msg_verbose)
+ msg_info("%s: %s", myname, prints[i]);
+
+ /*
+ * Regexp tables don't make sense for certificate fingerprints.
+ * That may be so, but we can't ignore the entire
+ * check_ccert_access request without logging a warning.
+ *
+ * Log the peer CommonName when access is denied. Non-printable
+ * characters will be neutered by smtpd_check_reject(). The SMTP
+ * client name and address are always syslogged as part of a
+ * "reject" event.
+ */
+ result = check_access(state, table, prints[i],
+ DICT_FLAG_NONE, &found,
+ state->tls_context->peer_CN,
+ SMTPD_NAME_CCERT, def_acl);
+ if (result != SMTPD_CHECK_DUNNO)
+ break;
+ }
+ }
+#endif
+ return (result);
+}
+
+/* check_sasl_access - access by SASL user name */
+
+#ifdef USE_SASL_AUTH
+
+static int check_sasl_access(SMTPD_STATE *state, const char *table,
+ const char *def_acl)
+{
+ int result;
+ int unused_found;
+ char *sane_username = printable(mystrdup(state->sasl_username), '_');
+
+ result = check_access(state, table, state->sasl_username,
+ DICT_FLAG_NONE, &unused_found, sane_username,
+ SMTPD_NAME_SASL_USER, def_acl);
+ myfree(sane_username);
+ return (result);
+}
+
+#endif
+
+/* check_mail_access - OK/FAIL based on mail address lookup */
+
+static int check_mail_access(SMTPD_STATE *state, const char *table,
+ const char *addr, int *found,
+ const char *reply_name,
+ const char *reply_class,
+ const char *def_acl)
+{
+ const char *myname = "check_mail_access";
+ const RESOLVE_REPLY *reply;
+ const char *value;
+ int lookup_strategy;
+ int status;
+ MAPS *maps;
+
+ if (msg_verbose)
+ msg_info("%s: %s", myname, addr);
+
+ /*
+ * Resolve the address.
+ */
+ reply = smtpd_resolve_addr(strcmp(reply_class, SMTPD_NAME_SENDER) == 0 ?
+ state->recipient : state->sender, addr);
+ if (reply->flags & RESOLVE_FLAG_FAIL)
+ reject_dict_retry(state, addr);
+
+ /*
+ * Garbage in, garbage out. Every address from rewrite_clnt_internal()
+ * and from resolve_clnt_query() must be fully qualified.
+ */
+ if (strrchr(CONST_STR(reply->recipient), '@') == 0) {
+ msg_warn("%s: no @domain in address: %s", myname,
+ CONST_STR(reply->recipient));
+ return (0);
+ }
+
+ /*
+ * Source-routed (non-local or virtual) recipient addresses are too
+ * suspicious for returning an "OK" result. The complicated expression
+ * below was brought to you by the keyboard of Victor Duchovni, Morgan
+ * Stanley and hacked up a bit by Wietse.
+ */
+#define SUSPICIOUS(reply, reply_class) \
+ (var_allow_untrust_route == 0 \
+ && (reply->flags & RESOLVE_FLAG_ROUTED) \
+ && strcmp(reply_class, SMTPD_NAME_RECIPIENT) == 0)
+
+ /*
+ * Look up user+foo@domain if the address has an extension, user@domain
+ * otherwise.
+ */
+ lookup_strategy = MA_FIND_FULL | MA_FIND_NOEXT | MA_FIND_DOMAIN
+ | MA_FIND_LOCALPART_AT
+ | (access_parent_style == MATCH_FLAG_PARENT ?
+ MA_FIND_PDMS : MA_FIND_PDDMDS);
+
+ if ((maps = (MAPS *) htable_find(map_command_table, table)) == 0) {
+ msg_warn("%s: unexpected dictionary: %s", myname, table);
+ value = "451 4.3.5 Server configuration error";
+ return (check_table_result(state, table, value,
+ CONST_STR(reply->recipient),
+ reply_name, reply_class,
+ def_acl));
+ }
+ if ((value = mail_addr_find_strategy(maps, CONST_STR(reply->recipient),
+ (char **) 0, lookup_strategy)) != 0) {
+ *found = 1;
+ status = check_table_result(state, table, value,
+ CONST_STR(reply->recipient),
+ reply_name, reply_class, def_acl);
+ return (status == SMTPD_CHECK_OK && SUSPICIOUS(reply, reply_class) ?
+ SMTPD_CHECK_DUNNO : status);
+ } else if (maps->error != 0) {
+ /* Warning is already logged. */
+ value = "451 4.3.5 Server configuration error";
+ return (check_table_result(state, table, value,
+ CONST_STR(reply->recipient),
+ reply_name, reply_class,
+ def_acl));
+ }
+
+ /*
+ * Undecided when no match found.
+ */
+ return (SMTPD_CHECK_DUNNO);
+}
+
+/* Support for different DNSXL lookup results. */
+
+static SMTPD_RBL_STATE dnsxl_stat_soft[1];
+
+#define SMTPD_DNSXL_STAT_SOFT(dnsxl_res) ((dnsxl_res) == dnsxl_stat_soft)
+#define SMTPD_DNXSL_STAT_HARD(dnsxl_res) ((dnsxl_res) == 0)
+#define SMTPD_DNSXL_STAT_OK(dnsxl_res) \
+ !(SMTPD_DNXSL_STAT_HARD(dnsxl_res) || SMTPD_DNSXL_STAT_SOFT(dnsxl_res))
+
+/* rbl_pagein - look up an RBL lookup result */
+
+static void *rbl_pagein(const char *query, void *unused_context)
+{
+ DNS_RR *txt_list;
+ VSTRING *why;
+ int dns_status;
+ SMTPD_RBL_STATE *rbl = 0;
+ DNS_RR *addr_list;
+ DNS_RR *rr;
+ DNS_RR *next;
+ VSTRING *buf;
+ int space_left;
+
+ /*
+ * Do the query. If the DNS lookup produces no definitive reply, give the
+ * requestor the benefit of the doubt. We can't block all email simply
+ * because an RBL server is unavailable.
+ *
+ * Don't do this for AAAA records. Yet.
+ */
+ why = vstring_alloc(10);
+ dns_status = dns_lookup(query, T_A, 0, &addr_list, (VSTRING *) 0, why);
+ if (dns_status != DNS_OK && dns_status != DNS_NOTFOUND) {
+ msg_warn("%s: RBL lookup error: %s", query, STR(why));
+ rbl = dnsxl_stat_soft;
+ }
+ vstring_free(why);
+ if (dns_status != DNS_OK)
+ return ((void *) rbl);
+
+ /*
+ * Save the result. Yes, we cache negative results as well as positive
+ * results. Concatenate multiple TXT records, up to some limit.
+ */
+#define RBL_TXT_LIMIT 500
+
+ rbl = (SMTPD_RBL_STATE *) mymalloc(sizeof(*rbl));
+ dns_status = dns_lookup(query, T_TXT, 0, &txt_list,
+ (VSTRING *) 0, (VSTRING *) 0);
+ if (dns_status == DNS_OK) {
+ buf = vstring_alloc(1);
+ space_left = RBL_TXT_LIMIT;
+ for (rr = txt_list; rr != 0 && space_left > 0; rr = next) {
+ vstring_strncat(buf, rr->data, (int) rr->data_len > space_left ?
+ space_left : rr->data_len);
+ space_left = RBL_TXT_LIMIT - VSTRING_LEN(buf);
+ next = rr->next;
+ if (next && space_left > 3) {
+ vstring_strcat(buf, " / ");
+ space_left -= 3;
+ }
+ }
+ rbl->txt = vstring_export(buf);
+ dns_rr_free(txt_list);
+ } else {
+ if (dns_status == DNS_POLICY)
+ msg_warn("%s: TXT lookup error: %s",
+ query, "DNS reply filter drops all results");
+ rbl->txt = 0;
+ }
+ rbl->a = addr_list;
+ return ((void *) rbl);
+}
+
+/* rbl_pageout - discard an RBL lookup result */
+
+static void rbl_pageout(void *data, void *unused_context)
+{
+ SMTPD_RBL_STATE *rbl = (SMTPD_RBL_STATE *) data;
+
+ if (SMTPD_DNSXL_STAT_OK(rbl)) {
+ if (rbl->txt)
+ myfree(rbl->txt);
+ if (rbl->a)
+ dns_rr_free(rbl->a);
+ myfree((void *) rbl);
+ }
+}
+
+/* rbl_byte_pagein - parse RBL reply pattern, save byte codes */
+
+static void *rbl_byte_pagein(const char *query, void *unused_context)
+{
+ VSTRING *byte_codes = vstring_alloc(100);
+ char *saved_query = mystrdup(query);
+ char *saved_byte_codes;
+ char *err;
+
+ if ((err = ip_match_parse(byte_codes, saved_query)) != 0)
+ msg_fatal("RBL reply error: %s", err);
+ saved_byte_codes = ip_match_save(byte_codes);
+ myfree(saved_query);
+ vstring_free(byte_codes);
+ return (saved_byte_codes);
+}
+
+/* rbl_byte_pageout - discard parsed RBL reply byte codes */
+
+static void rbl_byte_pageout(void *data, void *unused_context)
+{
+ myfree(data);
+}
+
+/* rbl_expand_lookup - RBL specific $name expansion */
+
+static const char *rbl_expand_lookup(const char *name, int mode,
+ void *context)
+{
+ SMTPD_RBL_EXPAND_CONTEXT *rbl_exp = (SMTPD_RBL_EXPAND_CONTEXT *) context;
+ SMTPD_STATE *state = rbl_exp->state;
+
+#define STREQ(x,y) (*(x) == *(y) && strcmp((x), (y)) == 0)
+
+ if (state->expand_buf == 0)
+ state->expand_buf = vstring_alloc(10);
+
+ if (msg_verbose > 1)
+ msg_info("rbl_expand_lookup: ${%s}", name);
+
+ /*
+ * Be sure to return NULL only for non-existent names.
+ */
+ if (STREQ(name, MAIL_ATTR_RBL_CODE)) {
+ vstring_sprintf(state->expand_buf, "%d", var_maps_rbl_code);
+ return (STR(state->expand_buf));
+ } else if (STREQ(name, MAIL_ATTR_RBL_DOMAIN)) {
+ return (rbl_exp->domain);
+ } else if (STREQ(name, MAIL_ATTR_RBL_REASON)) {
+ return (rbl_exp->txt);
+ } else if (STREQ(name, MAIL_ATTR_RBL_TXT)) {/* LaMont compat */
+ return (rbl_exp->txt);
+ } else if (STREQ(name, MAIL_ATTR_RBL_WHAT)) {
+ return (rbl_exp->what);
+ } else if (STREQ(name, MAIL_ATTR_RBL_CLASS)) {
+ return (rbl_exp->class);
+ } else {
+ return (smtpd_expand_lookup(name, mode, (void *) state));
+ }
+}
+
+/* rbl_reject_reply - format reply after RBL reject */
+
+static int rbl_reject_reply(SMTPD_STATE *state, const SMTPD_RBL_STATE *rbl,
+ const char *rbl_domain,
+ const char *what,
+ const char *reply_class)
+{
+ const char *myname = "rbl_reject_reply";
+ VSTRING *why = 0;
+ const char *template = 0;
+ SMTPD_RBL_EXPAND_CONTEXT rbl_exp;
+ int result;
+ DSN_SPLIT dp;
+ int code;
+
+ /*
+ * Use the server-specific reply template or use the default one.
+ */
+ if (*var_rbl_reply_maps) {
+ template = maps_find(rbl_reply_maps, rbl_domain, DICT_FLAG_NONE);
+ if (rbl_reply_maps->error)
+ reject_server_error(state);
+ }
+ why = vstring_alloc(100);
+ rbl_exp.state = state;
+ rbl_exp.domain = mystrdup(rbl_domain);
+ (void) split_at(rbl_exp.domain, '=');
+ rbl_exp.what = what;
+ rbl_exp.class = reply_class;
+ rbl_exp.txt = (rbl->txt == 0 ? "" : rbl->txt);
+
+ for (;;) {
+ if (template == 0)
+ template = var_def_rbl_reply;
+ if (mac_expand(why, template, MAC_EXP_FLAG_NONE,
+ STR(smtpd_expand_filter), rbl_expand_lookup,
+ (void *) &rbl_exp) == 0)
+ break;
+ if (template == var_def_rbl_reply)
+ msg_fatal("%s: bad default rbl reply template: %s",
+ myname, var_def_rbl_reply);
+ msg_warn("%s: bad rbl reply template for domain %s: %s",
+ myname, rbl_domain, template);
+ template = 0; /* pretend not found */
+ }
+
+ /*
+ * XXX Impedance mis-match.
+ *
+ * Validate the response, that is, the response must begin with a
+ * three-digit status code, and the first digit must be 4 or 5. If the
+ * response is bad, log a warning and send a generic response instead.
+ */
+ if ((STR(why)[0] != '4' && STR(why)[0] != '5')
+ || !ISDIGIT(STR(why)[1]) || !ISDIGIT(STR(why)[2])
+ || STR(why)[3] != ' ') {
+ msg_warn("rbl response code configuration error: %s", STR(why));
+ result = smtpd_check_reject(state, MAIL_ERROR_POLICY,
+ 450, "4.7.1", "Service unavailable");
+ } else {
+ code = atoi(STR(why));
+ dsn_split(&dp, "4.7.1", STR(why) + 4);
+ result = smtpd_check_reject(state, MAIL_ERROR_POLICY,
+ code,
+ smtpd_dsn_fix(DSN_STATUS(dp.dsn),
+ reply_class),
+ "%s", *dp.text ?
+ dp.text : "Service unavailable");
+ }
+
+ /*
+ * Clean up.
+ */
+ myfree(rbl_exp.domain);
+ vstring_free(why);
+
+ return (result);
+}
+
+/* rbl_match_addr - match address list */
+
+static int rbl_match_addr(SMTPD_RBL_STATE *rbl, const char *byte_codes)
+{
+ const char *myname = "rbl_match_addr";
+ DNS_RR *rr;
+
+ for (rr = rbl->a; rr != 0; rr = rr->next) {
+ if (rr->type == T_A) {
+ if (ip_match_execute(byte_codes, rr->data))
+ return (1);
+ } else {
+ msg_warn("%s: skipping record type %s for query %s",
+ myname, dns_strtype(rr->type), rr->qname);
+ }
+ }
+ return (0);
+}
+
+/* find_dnsxl_addr - look up address in DNSXL */
+
+static const SMTPD_RBL_STATE *find_dnsxl_addr(SMTPD_STATE *state,
+ const char *rbl_domain,
+ const char *addr)
+{
+ const char *myname = "find_dnsxl_addr";
+ ARGV *octets;
+ VSTRING *query;
+ int i;
+ SMTPD_RBL_STATE *rbl;
+ const char *reply_addr;
+ const char *byte_codes;
+ struct addrinfo *res;
+ unsigned char *ipv6_addr;
+
+ query = vstring_alloc(100);
+
+ /*
+ * Reverse the client IPV6 address, represented as 32 hexadecimal
+ * nibbles. We use the binary address to avoid tricky code. Asking for an
+ * AAAA record makes no sense here. Just like with IPv4 we use the lookup
+ * result as a bit mask, not as an IP address.
+ */
+#ifdef HAS_IPV6
+ if (valid_ipv6_hostaddr(addr, DONT_GRIPE)) {
+ if (hostaddr_to_sockaddr(addr, (char *) 0, 0, &res) != 0
+ || res->ai_family != PF_INET6)
+ msg_fatal("%s: unable to convert address %s", myname, addr);
+ ipv6_addr = (unsigned char *) &SOCK_ADDR_IN6_ADDR(res->ai_addr);
+ for (i = sizeof(SOCK_ADDR_IN6_ADDR(res->ai_addr)) - 1; i >= 0; i--)
+ vstring_sprintf_append(query, "%x.%x.",
+ ipv6_addr[i] & 0xf, ipv6_addr[i] >> 4);
+ freeaddrinfo(res);
+ } else
+#endif
+
+ /*
+ * Reverse the client IPV4 address, represented as four decimal octet
+ * values. We use the textual address for convenience.
+ */
+ {
+ octets = argv_split(addr, ".");
+ for (i = octets->argc - 1; i >= 0; i--) {
+ vstring_strcat(query, octets->argv[i]);
+ vstring_strcat(query, ".");
+ }
+ argv_free(octets);
+ }
+
+ /*
+ * Tack on the RBL domain name and query the DNS for an A record.
+ */
+ vstring_strcat(query, rbl_domain);
+ reply_addr = split_at(STR(query), '=');
+ rbl = (SMTPD_RBL_STATE *) ctable_locate(smtpd_rbl_cache, STR(query));
+ if (reply_addr != 0)
+ byte_codes = ctable_locate(smtpd_rbl_byte_cache, reply_addr);
+
+ /*
+ * If the record exists, match the result address.
+ */
+ if (SMTPD_DNSXL_STAT_OK(rbl) && reply_addr != 0
+ && !rbl_match_addr(rbl, byte_codes))
+ rbl = 0;
+ vstring_free(query);
+ return (rbl);
+}
+
+/* reject_rbl_addr - reject address in real-time blackhole list */
+
+static int reject_rbl_addr(SMTPD_STATE *state, const char *rbl_domain,
+ const char *addr, const char *reply_class)
+{
+ const char *myname = "reject_rbl_addr";
+ const SMTPD_RBL_STATE *rbl;
+
+ if (msg_verbose)
+ msg_info("%s: %s %s", myname, reply_class, addr);
+
+ rbl = find_dnsxl_addr(state, rbl_domain, addr);
+ if (!SMTPD_DNSXL_STAT_OK(rbl)) {
+ return (SMTPD_CHECK_DUNNO);
+ } else {
+ return (rbl_reject_reply(state, rbl, rbl_domain, addr, reply_class));
+ }
+}
+
+/* permit_dnswl_addr - permit address in DNSWL */
+
+static int permit_dnswl_addr(SMTPD_STATE *state, const char *dnswl_domain,
+ const char *addr, const char *reply_class)
+{
+ const char *myname = "permit_dnswl_addr";
+ const SMTPD_RBL_STATE *dnswl_result;
+
+ if (msg_verbose)
+ msg_info("%s: %s", myname, addr);
+
+ /* Safety: don't whitelist unauthorized recipients. */
+ if (strcmp(state->where, SMTPD_CMD_RCPT) == 0 && state->recipient != 0
+ && permit_auth_destination(state, state->recipient) != SMTPD_CHECK_OK)
+ return (SMTPD_CHECK_DUNNO);
+
+ dnswl_result = find_dnsxl_addr(state, dnswl_domain, addr);
+ if (SMTPD_DNXSL_STAT_HARD(dnswl_result)) {
+ return (SMTPD_CHECK_DUNNO);
+ } else if (SMTPD_DNSXL_STAT_SOFT(dnswl_result)) {
+ /* XXX: Make configurable as dnswl_tempfail_action. */
+ DEFER_IF_REJECT3(state, MAIL_ERROR_POLICY,
+ 450, "4.7.1",
+ "<%s>: %s rejected: %s",
+ addr, reply_class,
+ "Service unavailable");
+ return (SMTPD_CHECK_DUNNO);
+ } else if (SMTPD_DNSXL_STAT_OK(dnswl_result)) {
+ return (SMTPD_CHECK_OK);
+ } else {
+ /* Future proofing, in case find_dnsxl_addr() result is changed. */
+ msg_panic("%s: find_dnsxl_addr API failure", myname);
+ }
+}
+
+/* find_dnsxl_domain - reject if domain in real-time blackhole list */
+
+static const SMTPD_RBL_STATE *find_dnsxl_domain(SMTPD_STATE *state,
+ const char *rbl_domain, const char *what)
+{
+ VSTRING *query;
+ SMTPD_RBL_STATE *rbl;
+ const char *domain;
+ const char *reply_addr;
+ const char *byte_codes;
+ const char *suffix;
+ const char *adomain;
+
+ /*
+ * Extract the domain, tack on the RBL domain name and query the DNS for
+ * an A record.
+ */
+ if ((domain = strrchr(what, '@')) != 0) {
+ domain += 1;
+ if (domain[0] == '[')
+ return (SMTPD_CHECK_DUNNO);
+ } else
+ domain = what;
+
+ /*
+ * XXX Some Spamhaus RHSBL rejects lookups with "No IP queries" even if
+ * the name has an alphanumerical prefix. We play safe, and skip both
+ * RHSBL and RHSWL queries for names ending in a numerical suffix.
+ */
+ if (domain[0] == 0)
+ return (SMTPD_CHECK_DUNNO);
+ suffix = strrchr(domain, '.');
+ if (alldig(suffix == 0 ? domain : suffix + 1))
+ return (SMTPD_CHECK_DUNNO);
+
+ /*
+ * Fix 20140706: convert domain to ASCII.
+ */
+#ifndef NO_EAI
+ if (!allascii(domain) && (adomain = midna_domain_to_ascii(domain)) != 0) {
+ if (msg_verbose)
+ msg_info("%s asciified to %s", domain, adomain);
+ domain = adomain;
+ }
+#endif
+ if (domain[0] == 0 || valid_hostname(domain, DONT_GRIPE) == 0)
+ return (SMTPD_CHECK_DUNNO);
+
+ query = vstring_alloc(100);
+ vstring_sprintf(query, "%s.%s", domain, rbl_domain);
+ reply_addr = split_at(STR(query), '=');
+ rbl = (SMTPD_RBL_STATE *) ctable_locate(smtpd_rbl_cache, STR(query));
+ if (reply_addr != 0)
+ byte_codes = ctable_locate(smtpd_rbl_byte_cache, reply_addr);
+
+ /*
+ * If the record exists, match the result address.
+ */
+ if (SMTPD_DNSXL_STAT_OK(rbl) && reply_addr != 0
+ && !rbl_match_addr(rbl, byte_codes))
+ rbl = 0;
+ vstring_free(query);
+ return (rbl);
+}
+
+/* reject_rbl_domain - reject if domain in real-time blackhole list */
+
+static int reject_rbl_domain(SMTPD_STATE *state, const char *rbl_domain,
+ const char *what, const char *reply_class)
+{
+ const char *myname = "reject_rbl_domain";
+ const SMTPD_RBL_STATE *rbl;
+
+ if (msg_verbose)
+ msg_info("%s: %s %s", myname, rbl_domain, what);
+
+ rbl = find_dnsxl_domain(state, rbl_domain, what);
+ if (!SMTPD_DNSXL_STAT_OK(rbl)) {
+ return (SMTPD_CHECK_DUNNO);
+ } else {
+ return (rbl_reject_reply(state, rbl, rbl_domain, what, reply_class));
+ }
+}
+
+/* permit_dnswl_domain - permit domain in DNSWL */
+
+static int permit_dnswl_domain(SMTPD_STATE *state, const char *dnswl_domain,
+ const char *what, const char *reply_class)
+{
+ const char *myname = "permit_dnswl_domain";
+ const SMTPD_RBL_STATE *dnswl_result;
+
+ if (msg_verbose)
+ msg_info("%s: %s", myname, what);
+
+ /* Safety: don't whitelist unauthorized recipients. */
+ if (strcmp(state->where, SMTPD_CMD_RCPT) == 0 && state->recipient != 0
+ && permit_auth_destination(state, state->recipient) != SMTPD_CHECK_OK)
+ return (SMTPD_CHECK_DUNNO);
+
+ dnswl_result = find_dnsxl_domain(state, dnswl_domain, what);
+ if (SMTPD_DNXSL_STAT_HARD(dnswl_result)) {
+ return (SMTPD_CHECK_DUNNO);
+ } else if (SMTPD_DNSXL_STAT_SOFT(dnswl_result)) {
+ /* XXX: Make configurable as rhswl_tempfail_action. */
+ DEFER_IF_REJECT3(state, MAIL_ERROR_POLICY,
+ 450, "4.7.1",
+ "<%s>: %s rejected: %s",
+ what, reply_class,
+ "Service unavailable");
+ return (SMTPD_CHECK_DUNNO);
+ } else if (SMTPD_DNSXL_STAT_OK(dnswl_result)) {
+ return (SMTPD_CHECK_OK);
+ } else {
+ /* Future proofing, in case find_dnsxl_addr() result is changed. */
+ msg_panic("%s: find_dnsxl_addr API failure", myname);
+ }
+}
+
+/* reject_maps_rbl - reject if client address in real-time blackhole list */
+
+static int reject_maps_rbl(SMTPD_STATE *state)
+{
+ const char *myname = "reject_maps_rbl";
+ char *saved_domains = mystrdup(var_maps_rbl_domains);
+ char *bp = saved_domains;
+ char *rbl_domain;
+ int result = SMTPD_CHECK_DUNNO;
+ static int warned;
+
+ if (msg_verbose)
+ msg_info("%s: %s", myname, state->addr);
+
+ if (warned == 0) {
+ warned++;
+ msg_warn("support for restriction \"%s\" will be removed from %s; "
+ "use \"%s domain-name\" instead",
+ REJECT_MAPS_RBL, var_mail_name, REJECT_RBL_CLIENT);
+ }
+ while ((rbl_domain = mystrtok(&bp, CHARS_COMMA_SP)) != 0) {
+ result = reject_rbl_addr(state, rbl_domain, state->addr,
+ SMTPD_NAME_CLIENT);
+ if (result != SMTPD_CHECK_DUNNO)
+ break;
+ }
+
+ /*
+ * Clean up.
+ */
+ myfree(saved_domains);
+
+ return (result);
+}
+
+#ifdef USE_SASL_AUTH
+
+/* reject_auth_sender_login_mismatch - logged in client must own sender address */
+
+static int reject_auth_sender_login_mismatch(SMTPD_STATE *state, const char *sender, int allow_unknown_sender)
+{
+ const RESOLVE_REPLY *reply;
+ const char *owners;
+ char *saved_owners;
+ char *cp;
+ char *name;
+ int found = 0;
+
+#define ALLOW_UNKNOWN_SENDER 1
+#define FORBID_UNKNOWN_SENDER 0
+
+ /*
+ * Reject if the client is logged in and does not own the sender address.
+ */
+ if (smtpd_sender_login_maps && state->sasl_username) {
+ reply = smtpd_resolve_addr(state->recipient, sender);
+ if (reply->flags & RESOLVE_FLAG_FAIL)
+ reject_dict_retry(state, sender);
+ if ((owners = check_mail_addr_find(state, sender, smtpd_sender_login_maps,
+ STR(reply->recipient), (char **) 0)) != 0) {
+ cp = saved_owners = mystrdup(owners);
+ while ((name = mystrtok(&cp, CHARS_COMMA_SP)) != 0) {
+ if (strcasecmp_utf8(state->sasl_username, name) == 0) {
+ found = 1;
+ break;
+ }
+ }
+ myfree(saved_owners);
+ } else if (allow_unknown_sender)
+ return (SMTPD_CHECK_DUNNO);
+ if (!found)
+ return (smtpd_check_reject(state, MAIL_ERROR_POLICY, 553, "5.7.1",
+ "<%s>: Sender address rejected: not owned by user %s",
+ sender, state->sasl_username));
+ }
+ return (SMTPD_CHECK_DUNNO);
+}
+
+/* reject_unauth_sender_login_mismatch - sender requires client is logged in */
+
+static int reject_unauth_sender_login_mismatch(SMTPD_STATE *state, const char *sender)
+{
+ const RESOLVE_REPLY *reply;
+
+ /*
+ * Reject if the client is not logged in and the sender address has an
+ * owner.
+ */
+ if (smtpd_sender_login_maps && !state->sasl_username) {
+ reply = smtpd_resolve_addr(state->recipient, sender);
+ if (reply->flags & RESOLVE_FLAG_FAIL)
+ reject_dict_retry(state, sender);
+ if (check_mail_addr_find(state, sender, smtpd_sender_login_maps,
+ STR(reply->recipient), (char **) 0) != 0)
+ return (smtpd_check_reject(state, MAIL_ERROR_POLICY, 553, "5.7.1",
+ "<%s>: Sender address rejected: not logged in", sender));
+ }
+ return (SMTPD_CHECK_DUNNO);
+}
+
+#endif
+
+/* valid_utf8_action - validate UTF-8 policy server response */
+
+static int valid_utf8_action(const char *server, const char *action)
+{
+ int retval;
+
+ if ((retval = valid_utf8_string(action, strlen(action))) == 0)
+ msg_warn("malformed UTF-8 in policy server %s response: \"%s\"",
+ server, action);
+ return (retval);
+}
+
+/* check_policy_service - check delegated policy service */
+
+static int check_policy_service(SMTPD_STATE *state, const char *server,
+ const char *reply_name, const char *reply_class,
+ const char *def_acl)
+{
+ static VSTRING *action = 0;
+ SMTPD_POLICY_CLNT *policy_clnt;
+
+#ifdef USE_TLS
+ VSTRING *subject_buf;
+ VSTRING *issuer_buf;
+ const char *subject;
+ const char *issuer;
+
+#endif
+ int ret;
+
+ /*
+ * Sanity check.
+ */
+ if (!policy_clnt_table
+ || (policy_clnt = (SMTPD_POLICY_CLNT *)
+ htable_find(policy_clnt_table, server)) == 0)
+ msg_panic("check_policy_service: no client endpoint for server %s",
+ server);
+
+ /*
+ * Initialize.
+ */
+ if (action == 0)
+ action = vstring_alloc(10);
+
+#ifdef USE_TLS
+#define ENCODE_CN(coded_CN, coded_CN_buf, CN) do { \
+ if (!TLS_CERT_IS_TRUSTED(state->tls_context) || *(CN) == 0) { \
+ coded_CN_buf = 0; \
+ coded_CN = ""; \
+ } else { \
+ coded_CN_buf = vstring_alloc(strlen(CN) + 1); \
+ xtext_quote(coded_CN_buf, CN, ""); \
+ coded_CN = STR(coded_CN_buf); \
+ } \
+ } while (0);
+
+ ENCODE_CN(subject, subject_buf, state->tls_context->peer_CN);
+ ENCODE_CN(issuer, issuer_buf, state->tls_context->issuer_CN);
+#endif
+
+ if (attr_clnt_request(policy_clnt->client,
+ ATTR_FLAG_NONE, /* Query attributes. */
+ SEND_ATTR_STR(MAIL_ATTR_REQ, "smtpd_access_policy"),
+ SEND_ATTR_STR(MAIL_ATTR_PROTO_STATE,
+ STREQ(state->where, SMTPD_CMD_BDAT) ?
+ SMTPD_CMD_DATA : state->where),
+ SEND_ATTR_STR(MAIL_ATTR_ACT_PROTO_NAME, state->protocol),
+ SEND_ATTR_STR(MAIL_ATTR_ACT_CLIENT_ADDR, state->addr),
+ SEND_ATTR_STR(MAIL_ATTR_ACT_CLIENT_NAME, state->name),
+ SEND_ATTR_STR(MAIL_ATTR_ACT_CLIENT_PORT, state->port),
+ SEND_ATTR_STR(MAIL_ATTR_ACT_REVERSE_CLIENT_NAME,
+ state->reverse_name),
+ SEND_ATTR_STR(MAIL_ATTR_ACT_SERVER_ADDR,
+ state->dest_addr),
+ SEND_ATTR_STR(MAIL_ATTR_ACT_SERVER_PORT,
+ state->dest_port),
+ SEND_ATTR_STR(MAIL_ATTR_ACT_HELO_NAME,
+ state->helo_name ? state->helo_name : ""),
+ SEND_ATTR_STR(MAIL_ATTR_SENDER,
+ state->sender ? state->sender : ""),
+ SEND_ATTR_STR(MAIL_ATTR_RECIP,
+ state->recipient ? state->recipient : ""),
+ SEND_ATTR_INT(MAIL_ATTR_RCPT_COUNT,
+ ((strcasecmp(state->where, SMTPD_CMD_DATA) == 0) ||
+ (strcasecmp(state->where, SMTPD_CMD_BDAT) == 0) ||
+ (strcasecmp(state->where, SMTPD_AFTER_EOM) == 0)) ?
+ state->rcpt_count : 0),
+ SEND_ATTR_STR(MAIL_ATTR_QUEUEID,
+ state->queue_id ? state->queue_id : ""),
+ SEND_ATTR_STR(MAIL_ATTR_INSTANCE,
+ STR(state->instance)),
+ SEND_ATTR_LONG(MAIL_ATTR_SIZE,
+ (unsigned long) (state->act_size > 0 ?
+ state->act_size : state->msg_size)),
+ SEND_ATTR_STR(MAIL_ATTR_ETRN_DOMAIN,
+ state->etrn_name ? state->etrn_name : ""),
+ SEND_ATTR_STR(MAIL_ATTR_STRESS, var_stress),
+#ifdef USE_SASL_AUTH
+ SEND_ATTR_STR(MAIL_ATTR_SASL_METHOD,
+ state->sasl_method ? state->sasl_method : ""),
+ SEND_ATTR_STR(MAIL_ATTR_SASL_USERNAME,
+ state->sasl_username ? state->sasl_username : ""),
+ SEND_ATTR_STR(MAIL_ATTR_SASL_SENDER,
+ state->sasl_sender ? state->sasl_sender : ""),
+#endif
+#ifdef USE_TLS
+#define IF_ENCRYPTED(x, y) ((state->tls_context && ((x) != 0)) ? (x) : (y))
+ SEND_ATTR_STR(MAIL_ATTR_CCERT_SUBJECT, subject),
+ SEND_ATTR_STR(MAIL_ATTR_CCERT_ISSUER, issuer),
+
+ /*
+ * When directly checking the fingerprint, it is OK if the issuing CA is
+ * not trusted.
+ */
+ SEND_ATTR_STR(MAIL_ATTR_CCERT_CERT_FPRINT,
+ IF_ENCRYPTED(state->tls_context->peer_cert_fprint, "")),
+ SEND_ATTR_STR(MAIL_ATTR_CCERT_PKEY_FPRINT,
+ IF_ENCRYPTED(state->tls_context->peer_pkey_fprint, "")),
+ SEND_ATTR_STR(MAIL_ATTR_CRYPTO_PROTOCOL,
+ IF_ENCRYPTED(state->tls_context->protocol, "")),
+ SEND_ATTR_STR(MAIL_ATTR_CRYPTO_CIPHER,
+ IF_ENCRYPTED(state->tls_context->cipher_name, "")),
+ SEND_ATTR_INT(MAIL_ATTR_CRYPTO_KEYSIZE,
+ IF_ENCRYPTED(state->tls_context->cipher_usebits, 0)),
+#endif
+ SEND_ATTR_STR(MAIL_ATTR_POL_CONTEXT,
+ policy_clnt->policy_context),
+ ATTR_TYPE_END,
+ ATTR_FLAG_MISSING, /* Reply attributes. */
+ RECV_ATTR_STR(MAIL_ATTR_ACTION, action),
+ ATTR_TYPE_END) != 1
+ || (var_smtputf8_enable && valid_utf8_action(server, STR(action)) == 0)) {
+ NOCLOBBER static int nesting_level = 0;
+ jmp_buf savebuf;
+ int status;
+
+ /*
+ * Safety to prevent recursive execution of the default action.
+ */
+ nesting_level += 1;
+ memcpy(ADDROF(savebuf), ADDROF(smtpd_check_buf), sizeof(savebuf));
+ status = setjmp(smtpd_check_buf);
+ if (status != 0) {
+ nesting_level -= 1;
+ memcpy(ADDROF(smtpd_check_buf), ADDROF(savebuf),
+ sizeof(smtpd_check_buf));
+ longjmp(smtpd_check_buf, status);
+ }
+ ret = check_table_result(state, server, nesting_level == 1 ?
+ policy_clnt->def_action :
+ DEF_SMTPD_POLICY_DEF_ACTION,
+ "policy query", reply_name,
+ reply_class, def_acl);
+ nesting_level -= 1;
+ memcpy(ADDROF(smtpd_check_buf), ADDROF(savebuf),
+ sizeof(smtpd_check_buf));
+ } else {
+
+ /*
+ * XXX This produces bogus error messages when the reply is
+ * malformed.
+ */
+ ret = check_table_result(state, server, STR(action),
+ "policy query", reply_name,
+ reply_class, def_acl);
+ }
+#ifdef USE_TLS
+ if (subject_buf)
+ vstring_free(subject_buf);
+ if (issuer_buf)
+ vstring_free(issuer_buf);
+#endif
+ return (ret);
+}
+
+/* is_map_command - restriction has form: check_xxx_access type:name */
+
+static int is_map_command(SMTPD_STATE *state, const char *name,
+ const char *command, char ***argp)
+{
+
+ /*
+ * This is a three-valued function: (a) this is not a check_xxx_access
+ * command, (b) this is a malformed check_xxx_access command, (c) this is
+ * a well-formed check_xxx_access command. That's too clumsy for function
+ * result values, so we use regular returns for (a) and (c), and use long
+ * jumps for the error case (b).
+ */
+ if (strcasecmp(name, command) != 0) {
+ return (0);
+ } else if (*(*argp + 1) == 0 || strchr(*(*argp += 1), ':') == 0) {
+ msg_warn("restriction %s: bad argument \"%s\": need maptype:mapname",
+ command, **argp);
+ reject_server_error(state);
+ } else {
+ return (1);
+ }
+}
+
+/* forbid_whitelist - disallow whitelisting */
+
+static void forbid_whitelist(SMTPD_STATE *state, const char *name,
+ int status, const char *target)
+{
+ if (state->discard == 0 && status == SMTPD_CHECK_OK) {
+ msg_warn("restriction %s returns OK for %s", name, target);
+ msg_warn("this is not allowed for security reasons");
+ msg_warn("use DUNNO instead of OK if you want to make an exception");
+ reject_server_error(state);
+ }
+}
+
+/* generic_checks - generic restrictions */
+
+static int generic_checks(SMTPD_STATE *state, ARGV *restrictions,
+ const char *reply_name,
+ const char *reply_class,
+ const char *def_acl)
+{
+ const char *myname = "generic_checks";
+ char **cpp;
+ const char *name;
+ int status = 0;
+ ARGV *list;
+ int found;
+ int saved_recursion = state->recursion++;
+
+ if (msg_verbose)
+ msg_info(">>> START %s RESTRICTIONS <<<", reply_class);
+
+ for (cpp = restrictions->argv; (name = *cpp) != 0; cpp++) {
+
+ if (state->discard != 0)
+ break;
+
+ if (msg_verbose)
+ msg_info("%s: name=%s", myname, name);
+
+ /*
+ * Pseudo restrictions.
+ */
+ if (strcasecmp(name, WARN_IF_REJECT) == 0) {
+ if (state->warn_if_reject == 0)
+ state->warn_if_reject = state->recursion;
+ continue;
+ }
+
+ /*
+ * Spoof the is_map_command() routine, so that we do not have to make
+ * special cases for the implicit short-hand access map notation.
+ */
+#define NO_DEF_ACL 0
+
+ if (strchr(name, ':') != 0) {
+ if (def_acl == NO_DEF_ACL) {
+ msg_warn("specify one of (%s, %s, %s, %s, %s, %s) before %s restriction \"%s\"",
+ CHECK_CLIENT_ACL, CHECK_REVERSE_CLIENT_ACL, CHECK_HELO_ACL, CHECK_SENDER_ACL,
+ CHECK_RECIP_ACL, CHECK_ETRN_ACL, reply_class, name);
+ reject_server_error(state);
+ }
+ name = def_acl;
+ cpp -= 1;
+ }
+
+ /*
+ * Generic restrictions.
+ */
+ if (strcasecmp(name, PERMIT_ALL) == 0) {
+ status = smtpd_acl_permit(state, name, reply_class,
+ reply_name, NO_PRINT_ARGS);
+ if (status == SMTPD_CHECK_OK && cpp[1] != 0)
+ msg_warn("restriction `%s' after `%s' is ignored",
+ cpp[1], PERMIT_ALL);
+ } else if (strcasecmp(name, DEFER_ALL) == 0) {
+ status = smtpd_check_reject(state, MAIL_ERROR_POLICY,
+ var_defer_code, "4.3.2",
+ "<%s>: %s rejected: Try again later",
+ reply_name, reply_class);
+ if (cpp[1] != 0 && state->warn_if_reject == 0)
+ msg_warn("restriction `%s' after `%s' is ignored",
+ cpp[1], DEFER_ALL);
+ } else if (strcasecmp(name, REJECT_ALL) == 0) {
+ status = smtpd_check_reject(state, MAIL_ERROR_POLICY,
+ var_reject_code, "5.7.1",
+ "<%s>: %s rejected: Access denied",
+ reply_name, reply_class);
+ if (cpp[1] != 0 && state->warn_if_reject == 0)
+ msg_warn("restriction `%s' after `%s' is ignored",
+ cpp[1], REJECT_ALL);
+ } else if (strcasecmp(name, REJECT_UNAUTH_PIPE) == 0) {
+ status = reject_unauth_pipelining(state, reply_name, reply_class);
+ } else if (strcasecmp(name, CHECK_POLICY_SERVICE) == 0) {
+ if (cpp[1] == 0 || strchr(cpp[1], ':') == 0) {
+ msg_warn("restriction %s must be followed by transport:server",
+ CHECK_POLICY_SERVICE);
+ reject_server_error(state);
+ } else
+ status = check_policy_service(state, *++cpp, reply_name,
+ reply_class, def_acl);
+ } else if (strcasecmp(name, DEFER_IF_PERMIT) == 0) {
+ status = DEFER_IF_PERMIT2(DEFER_IF_PERMIT_ACT,
+ state, MAIL_ERROR_POLICY,
+ 450, "4.7.0",
+ "<%s>: %s rejected: defer_if_permit requested",
+ reply_name, reply_class);
+ } else if (strcasecmp(name, DEFER_IF_REJECT) == 0) {
+ DEFER_IF_REJECT2(state, MAIL_ERROR_POLICY,
+ 450, "4.7.0",
+ "<%s>: %s rejected: defer_if_reject requested",
+ reply_name, reply_class);
+ } else if (strcasecmp(name, SLEEP) == 0) {
+ if (cpp[1] == 0 || alldig(cpp[1]) == 0) {
+ msg_warn("restriction %s must be followed by number", SLEEP);
+ reject_server_error(state);
+ } else
+ sleep(atoi(*++cpp));
+ } else if (strcasecmp(name, REJECT_PLAINTEXT_SESSION) == 0) {
+ status = reject_plaintext_session(state);
+ }
+
+ /*
+ * Client name/address restrictions.
+ */
+ else if (strcasecmp(name, REJECT_UNKNOWN_CLIENT_HOSTNAME) == 0
+ || strcasecmp(name, REJECT_UNKNOWN_CLIENT) == 0) {
+ status = reject_unknown_client(state);
+ } else if (strcasecmp(name, REJECT_UNKNOWN_REVERSE_HOSTNAME) == 0) {
+ status = reject_unknown_reverse_name(state);
+ } else if (strcasecmp(name, PERMIT_INET_INTERFACES) == 0) {
+ status = permit_inet_interfaces(state);
+ if (status == SMTPD_CHECK_OK)
+ status = smtpd_acl_permit(state, name, SMTPD_NAME_CLIENT,
+ state->namaddr, NO_PRINT_ARGS);
+ } else if (strcasecmp(name, PERMIT_MYNETWORKS) == 0) {
+ status = permit_mynetworks(state);
+ if (status == SMTPD_CHECK_OK)
+ status = smtpd_acl_permit(state, name, SMTPD_NAME_CLIENT,
+ state->namaddr, NO_PRINT_ARGS);
+ } else if (is_map_command(state, name, CHECK_CLIENT_ACL, &cpp)) {
+ status = check_namadr_access(state, *cpp, state->name, state->addr,
+ FULL, &found, state->namaddr,
+ SMTPD_NAME_CLIENT, def_acl);
+ } else if (is_map_command(state, name, CHECK_REVERSE_CLIENT_ACL, &cpp)) {
+ status = check_namadr_access(state, *cpp, state->reverse_name, state->addr,
+ FULL, &found, state->reverse_name,
+ SMTPD_NAME_REV_CLIENT, def_acl);
+ forbid_whitelist(state, name, status, state->reverse_name);
+ } else if (strcasecmp(name, REJECT_MAPS_RBL) == 0) {
+ status = reject_maps_rbl(state);
+ } else if (strcasecmp(name, REJECT_RBL_CLIENT) == 0
+ || strcasecmp(name, REJECT_RBL) == 0) {
+ if (cpp[1] == 0)
+ msg_warn("restriction %s requires domain name argument", name);
+ else
+ status = reject_rbl_addr(state, *(cpp += 1), state->addr,
+ SMTPD_NAME_CLIENT);
+ } else if (strcasecmp(name, PERMIT_DNSWL_CLIENT) == 0) {
+ if (cpp[1] == 0)
+ msg_warn("restriction %s requires domain name argument", name);
+ else {
+ status = permit_dnswl_addr(state, *(cpp += 1), state->addr,
+ SMTPD_NAME_CLIENT);
+ if (status == SMTPD_CHECK_OK)
+ status = smtpd_acl_permit(state, name, SMTPD_NAME_CLIENT,
+ state->namaddr, NO_PRINT_ARGS);
+ }
+ } else if (strcasecmp(name, REJECT_RHSBL_CLIENT) == 0) {
+ if (cpp[1] == 0)
+ msg_warn("restriction %s requires domain name argument",
+ name);
+ else {
+ cpp += 1;
+ if (strcasecmp(state->name, "unknown") != 0)
+ status = reject_rbl_domain(state, *cpp, state->name,
+ SMTPD_NAME_CLIENT);
+ }
+ } else if (strcasecmp(name, PERMIT_RHSWL_CLIENT) == 0) {
+ if (cpp[1] == 0)
+ msg_warn("restriction %s requires domain name argument",
+ name);
+ else {
+ cpp += 1;
+ if (strcasecmp(state->name, "unknown") != 0) {
+ status = permit_dnswl_domain(state, *cpp, state->name,
+ SMTPD_NAME_CLIENT);
+ if (status == SMTPD_CHECK_OK)
+ status = smtpd_acl_permit(state, name,
+ SMTPD_NAME_CLIENT, state->namaddr, NO_PRINT_ARGS);
+ }
+ }
+ } else if (strcasecmp(name, REJECT_RHSBL_REVERSE_CLIENT) == 0) {
+ if (cpp[1] == 0)
+ msg_warn("restriction %s requires domain name argument",
+ name);
+ else {
+ cpp += 1;
+ if (strcasecmp(state->reverse_name, "unknown") != 0)
+ status = reject_rbl_domain(state, *cpp, state->reverse_name,
+ SMTPD_NAME_REV_CLIENT);
+ }
+ } else if (is_map_command(state, name, CHECK_CCERT_ACL, &cpp)) {
+ status = check_ccert_access(state, *cpp, def_acl);
+ } else if (is_map_command(state, name, CHECK_SASL_ACL, &cpp)) {
+#ifdef USE_SASL_AUTH
+ if (var_smtpd_sasl_enable) {
+ if (state->sasl_username && state->sasl_username[0])
+ status = check_sasl_access(state, *cpp, def_acl);
+ } else
+#endif
+ msg_warn("restriction `%s' ignored: no SASL support", name);
+ } else if (is_map_command(state, name, CHECK_CLIENT_NS_ACL, &cpp)) {
+ if (strcasecmp(state->name, "unknown") != 0) {
+ status = check_server_access(state, *cpp, state->name,
+ T_NS, state->namaddr,
+ SMTPD_NAME_CLIENT, def_acl);
+ forbid_whitelist(state, name, status, state->name);
+ }
+ } else if (is_map_command(state, name, CHECK_CLIENT_MX_ACL, &cpp)) {
+ if (strcasecmp(state->name, "unknown") != 0) {
+ status = check_server_access(state, *cpp, state->name,
+ T_MX, state->namaddr,
+ SMTPD_NAME_CLIENT, def_acl);
+ forbid_whitelist(state, name, status, state->name);
+ }
+ } else if (is_map_command(state, name, CHECK_CLIENT_A_ACL, &cpp)) {
+ if (strcasecmp(state->name, "unknown") != 0) {
+ status = check_server_access(state, *cpp, state->name,
+ T_A, state->namaddr,
+ SMTPD_NAME_CLIENT, def_acl);
+ forbid_whitelist(state, name, status, state->name);
+ }
+ } else if (is_map_command(state, name, CHECK_REVERSE_CLIENT_NS_ACL, &cpp)) {
+ if (strcasecmp(state->reverse_name, "unknown") != 0) {
+ status = check_server_access(state, *cpp, state->reverse_name,
+ T_NS, state->reverse_name,
+ SMTPD_NAME_REV_CLIENT, def_acl);
+ forbid_whitelist(state, name, status, state->reverse_name);
+ }
+ } else if (is_map_command(state, name, CHECK_REVERSE_CLIENT_MX_ACL, &cpp)) {
+ if (strcasecmp(state->reverse_name, "unknown") != 0) {
+ status = check_server_access(state, *cpp, state->reverse_name,
+ T_MX, state->reverse_name,
+ SMTPD_NAME_REV_CLIENT, def_acl);
+ forbid_whitelist(state, name, status, state->reverse_name);
+ }
+ } else if (is_map_command(state, name, CHECK_REVERSE_CLIENT_A_ACL, &cpp)) {
+ if (strcasecmp(state->reverse_name, "unknown") != 0) {
+ status = check_server_access(state, *cpp, state->reverse_name,
+ T_A, state->reverse_name,
+ SMTPD_NAME_REV_CLIENT, def_acl);
+ forbid_whitelist(state, name, status, state->reverse_name);
+ }
+ }
+
+ /*
+ * HELO/EHLO parameter restrictions.
+ */
+ else if (is_map_command(state, name, CHECK_HELO_ACL, &cpp)) {
+ if (state->helo_name)
+ status = check_domain_access(state, *cpp, state->helo_name,
+ FULL, &found, state->helo_name,
+ SMTPD_NAME_HELO, def_acl);
+ } else if (strcasecmp(name, REJECT_INVALID_HELO_HOSTNAME) == 0
+ || strcasecmp(name, REJECT_INVALID_HOSTNAME) == 0) {
+ if (state->helo_name) {
+ if (*state->helo_name != '[')
+ status = reject_invalid_hostname(state, state->helo_name,
+ state->helo_name, SMTPD_NAME_HELO);
+ else
+ status = reject_invalid_hostaddr(state, state->helo_name,
+ state->helo_name, SMTPD_NAME_HELO);
+ }
+ } else if (strcasecmp(name, REJECT_UNKNOWN_HELO_HOSTNAME) == 0
+ || strcasecmp(name, REJECT_UNKNOWN_HOSTNAME) == 0) {
+ if (state->helo_name) {
+ if (*state->helo_name != '[')
+ status = reject_unknown_hostname(state, state->helo_name,
+ state->helo_name, SMTPD_NAME_HELO);
+ else
+ status = reject_invalid_hostaddr(state, state->helo_name,
+ state->helo_name, SMTPD_NAME_HELO);
+ }
+ } else if (strcasecmp(name, PERMIT_NAKED_IP_ADDR) == 0) {
+ msg_warn("restriction %s is deprecated. Use %s or %s instead",
+ PERMIT_NAKED_IP_ADDR, PERMIT_MYNETWORKS, PERMIT_SASL_AUTH);
+ if (state->helo_name) {
+ if (state->helo_name[strspn(state->helo_name, "0123456789.:")] == 0
+ && (status = reject_invalid_hostaddr(state, state->helo_name,
+ state->helo_name, SMTPD_NAME_HELO)) == 0)
+ status = smtpd_acl_permit(state, name, SMTPD_NAME_HELO,
+ state->helo_name, NO_PRINT_ARGS);
+ }
+ } else if (is_map_command(state, name, CHECK_HELO_NS_ACL, &cpp)) {
+ if (state->helo_name) {
+ status = check_server_access(state, *cpp, state->helo_name,
+ T_NS, state->helo_name,
+ SMTPD_NAME_HELO, def_acl);
+ forbid_whitelist(state, name, status, state->helo_name);
+ }
+ } else if (is_map_command(state, name, CHECK_HELO_MX_ACL, &cpp)) {
+ if (state->helo_name) {
+ status = check_server_access(state, *cpp, state->helo_name,
+ T_MX, state->helo_name,
+ SMTPD_NAME_HELO, def_acl);
+ forbid_whitelist(state, name, status, state->helo_name);
+ }
+ } else if (is_map_command(state, name, CHECK_HELO_A_ACL, &cpp)) {
+ if (state->helo_name) {
+ status = check_server_access(state, *cpp, state->helo_name,
+ T_A, state->helo_name,
+ SMTPD_NAME_HELO, def_acl);
+ forbid_whitelist(state, name, status, state->helo_name);
+ }
+ } else if (strcasecmp(name, REJECT_NON_FQDN_HELO_HOSTNAME) == 0
+ || strcasecmp(name, REJECT_NON_FQDN_HOSTNAME) == 0) {
+ if (state->helo_name) {
+ if (*state->helo_name != '[')
+ status = reject_non_fqdn_hostname(state, state->helo_name,
+ state->helo_name, SMTPD_NAME_HELO);
+ else
+ status = reject_invalid_hostaddr(state, state->helo_name,
+ state->helo_name, SMTPD_NAME_HELO);
+ }
+ } else if (strcasecmp(name, REJECT_RHSBL_HELO) == 0) {
+ if (cpp[1] == 0)
+ msg_warn("restriction %s requires domain name argument",
+ name);
+ else {
+ cpp += 1;
+ if (state->helo_name)
+ status = reject_rbl_domain(state, *cpp, state->helo_name,
+ SMTPD_NAME_HELO);
+ }
+ }
+
+ /*
+ * Sender mail address restrictions.
+ */
+ else if (is_map_command(state, name, CHECK_SENDER_ACL, &cpp)) {
+ if (state->sender && *state->sender)
+ status = check_mail_access(state, *cpp, state->sender,
+ &found, state->sender,
+ SMTPD_NAME_SENDER, def_acl);
+ if (state->sender && !*state->sender)
+ status = check_access(state, *cpp, var_smtpd_null_key, FULL,
+ &found, state->sender,
+ SMTPD_NAME_SENDER, def_acl);
+ } else if (strcasecmp(name, REJECT_UNKNOWN_ADDRESS) == 0) {
+ if (state->sender && *state->sender)
+ status = reject_unknown_address(state, state->sender,
+ state->sender, SMTPD_NAME_SENDER);
+ } else if (strcasecmp(name, REJECT_UNKNOWN_SENDDOM) == 0) {
+ if (state->sender && *state->sender)
+ status = reject_unknown_address(state, state->sender,
+ state->sender, SMTPD_NAME_SENDER);
+ } else if (strcasecmp(name, REJECT_UNVERIFIED_SENDER) == 0) {
+ if (state->sender && *state->sender)
+ status = reject_unverified_address(state, state->sender,
+ state->sender, SMTPD_NAME_SENDER,
+ var_unv_from_dcode, var_unv_from_rcode,
+ unv_from_tf_act,
+ var_unv_from_why);
+ } else if (strcasecmp(name, REJECT_NON_FQDN_SENDER) == 0) {
+ if (state->sender && *state->sender)
+ status = reject_non_fqdn_address(state, state->sender,
+ state->sender, SMTPD_NAME_SENDER);
+ } else if (strcasecmp(name, REJECT_AUTH_SENDER_LOGIN_MISMATCH) == 0) {
+#ifdef USE_SASL_AUTH
+ if (var_smtpd_sasl_enable) {
+ if (state->sender && *state->sender)
+ status = reject_auth_sender_login_mismatch(state,
+ state->sender, FORBID_UNKNOWN_SENDER);
+ } else
+#endif
+ msg_warn("restriction `%s' ignored: no SASL support", name);
+ } else if (strcasecmp(name, REJECT_KNOWN_SENDER_LOGIN_MISMATCH) == 0) {
+#ifdef USE_SASL_AUTH
+ if (var_smtpd_sasl_enable) {
+ if (state->sender && *state->sender) {
+ if (state->sasl_username)
+ status = reject_auth_sender_login_mismatch(state,
+ state->sender, ALLOW_UNKNOWN_SENDER);
+ else
+ status = reject_unauth_sender_login_mismatch(state, state->sender);
+ }
+ } else
+#endif
+ msg_warn("restriction `%s' ignored: no SASL support", name);
+ } else if (strcasecmp(name, REJECT_UNAUTH_SENDER_LOGIN_MISMATCH) == 0) {
+#ifdef USE_SASL_AUTH
+ if (var_smtpd_sasl_enable) {
+ if (state->sender && *state->sender)
+ status = reject_unauth_sender_login_mismatch(state, state->sender);
+ } else
+#endif
+ msg_warn("restriction `%s' ignored: no SASL support", name);
+ } else if (is_map_command(state, name, CHECK_SENDER_NS_ACL, &cpp)) {
+ if (state->sender && *state->sender) {
+ status = check_server_access(state, *cpp, state->sender,
+ T_NS, state->sender,
+ SMTPD_NAME_SENDER, def_acl);
+ forbid_whitelist(state, name, status, state->sender);
+ }
+ } else if (is_map_command(state, name, CHECK_SENDER_MX_ACL, &cpp)) {
+ if (state->sender && *state->sender) {
+ status = check_server_access(state, *cpp, state->sender,
+ T_MX, state->sender,
+ SMTPD_NAME_SENDER, def_acl);
+ forbid_whitelist(state, name, status, state->sender);
+ }
+ } else if (is_map_command(state, name, CHECK_SENDER_A_ACL, &cpp)) {
+ if (state->sender && *state->sender) {
+ status = check_server_access(state, *cpp, state->sender,
+ T_A, state->sender,
+ SMTPD_NAME_SENDER, def_acl);
+ forbid_whitelist(state, name, status, state->sender);
+ }
+ } else if (strcasecmp(name, REJECT_RHSBL_SENDER) == 0) {
+ if (cpp[1] == 0)
+ msg_warn("restriction %s requires domain name argument", name);
+ else {
+ cpp += 1;
+ if (state->sender && *state->sender)
+ status = reject_rbl_domain(state, *cpp, state->sender,
+ SMTPD_NAME_SENDER);
+ }
+ } else if (strcasecmp(name, REJECT_UNLISTED_SENDER) == 0) {
+ if (state->sender && *state->sender)
+ status = check_sender_rcpt_maps(state, state->sender);
+ }
+
+ /*
+ * Recipient mail address restrictions.
+ */
+ else if (is_map_command(state, name, CHECK_RECIP_ACL, &cpp)) {
+ if (state->recipient)
+ status = check_mail_access(state, *cpp, state->recipient,
+ &found, state->recipient,
+ SMTPD_NAME_RECIPIENT, def_acl);
+ } else if (strcasecmp(name, PERMIT_MX_BACKUP) == 0) {
+ if (state->recipient) {
+ status = permit_mx_backup(state, state->recipient,
+ state->recipient, SMTPD_NAME_RECIPIENT);
+ if (status == SMTPD_CHECK_OK)
+ status = smtpd_acl_permit(state, name, SMTPD_NAME_RECIPIENT,
+ state->recipient, NO_PRINT_ARGS);
+ }
+ } else if (strcasecmp(name, PERMIT_AUTH_DEST) == 0) {
+ if (state->recipient) {
+ status = permit_auth_destination(state, state->recipient);
+ if (status == SMTPD_CHECK_OK)
+ status = smtpd_acl_permit(state, name, SMTPD_NAME_RECIPIENT,
+ state->recipient, NO_PRINT_ARGS);
+ }
+ } else if (strcasecmp(name, REJECT_UNAUTH_DEST) == 0) {
+ if (state->recipient)
+ status = reject_unauth_destination(state, state->recipient,
+ var_relay_code, "5.7.1");
+ } else if (strcasecmp(name, DEFER_UNAUTH_DEST) == 0) {
+ if (state->recipient)
+ status = reject_unauth_destination(state, state->recipient,
+ var_relay_code - 100, "4.7.1");
+ } else if (strcasecmp(name, CHECK_RELAY_DOMAINS) == 0) {
+ if (state->recipient)
+ status = check_relay_domains(state, state->recipient,
+ state->recipient, SMTPD_NAME_RECIPIENT);
+ if (status == SMTPD_CHECK_OK)
+ status = smtpd_acl_permit(state, name, SMTPD_NAME_RECIPIENT,
+ state->recipient, NO_PRINT_ARGS);
+ if (cpp[1] != 0 && state->warn_if_reject == 0)
+ msg_warn("restriction `%s' after `%s' is ignored",
+ cpp[1], CHECK_RELAY_DOMAINS);
+ } else if (strcasecmp(name, PERMIT_SASL_AUTH) == 0) {
+#ifdef USE_SASL_AUTH
+ if (smtpd_sasl_is_active(state)) {
+ status = permit_sasl_auth(state,
+ SMTPD_CHECK_OK, SMTPD_CHECK_DUNNO);
+ if (status == SMTPD_CHECK_OK)
+ status = smtpd_acl_permit(state, name, SMTPD_NAME_CLIENT,
+ state->namaddr, NO_PRINT_ARGS);
+ }
+#endif
+ } else if (strcasecmp(name, PERMIT_TLS_ALL_CLIENTCERTS) == 0) {
+ status = permit_tls_clientcerts(state, 1);
+ if (status == SMTPD_CHECK_OK)
+ status = smtpd_acl_permit(state, name, SMTPD_NAME_CLIENT,
+ state->namaddr, NO_PRINT_ARGS);
+ } else if (strcasecmp(name, PERMIT_TLS_CLIENTCERTS) == 0) {
+ status = permit_tls_clientcerts(state, 0);
+ if (status == SMTPD_CHECK_OK)
+ status = smtpd_acl_permit(state, name, SMTPD_NAME_CLIENT,
+ state->namaddr, NO_PRINT_ARGS);
+ } else if (strcasecmp(name, REJECT_UNKNOWN_RCPTDOM) == 0) {
+ if (state->recipient)
+ status = reject_unknown_address(state, state->recipient,
+ state->recipient, SMTPD_NAME_RECIPIENT);
+ } else if (strcasecmp(name, REJECT_NON_FQDN_RCPT) == 0) {
+ if (state->recipient)
+ status = reject_non_fqdn_address(state, state->recipient,
+ state->recipient, SMTPD_NAME_RECIPIENT);
+ } else if (is_map_command(state, name, CHECK_RECIP_NS_ACL, &cpp)) {
+ if (state->recipient && *state->recipient) {
+ status = check_server_access(state, *cpp, state->recipient,
+ T_NS, state->recipient,
+ SMTPD_NAME_RECIPIENT, def_acl);
+ forbid_whitelist(state, name, status, state->recipient);
+ }
+ } else if (is_map_command(state, name, CHECK_RECIP_MX_ACL, &cpp)) {
+ if (state->recipient && *state->recipient) {
+ status = check_server_access(state, *cpp, state->recipient,
+ T_MX, state->recipient,
+ SMTPD_NAME_RECIPIENT, def_acl);
+ forbid_whitelist(state, name, status, state->recipient);
+ }
+ } else if (is_map_command(state, name, CHECK_RECIP_A_ACL, &cpp)) {
+ if (state->recipient && *state->recipient) {
+ status = check_server_access(state, *cpp, state->recipient,
+ T_A, state->recipient,
+ SMTPD_NAME_RECIPIENT, def_acl);
+ forbid_whitelist(state, name, status, state->recipient);
+ }
+ } else if (strcasecmp(name, REJECT_RHSBL_RECIPIENT) == 0) {
+ if (cpp[1] == 0)
+ msg_warn("restriction %s requires domain name argument", name);
+ else {
+ cpp += 1;
+ if (state->recipient)
+ status = reject_rbl_domain(state, *cpp, state->recipient,
+ SMTPD_NAME_RECIPIENT);
+ }
+ } else if (strcasecmp(name, CHECK_RCPT_MAPS) == 0
+ || strcasecmp(name, REJECT_UNLISTED_RCPT) == 0) {
+ if (state->recipient && *state->recipient)
+ status = check_recipient_rcpt_maps(state, state->recipient);
+ } else if (strcasecmp(name, REJECT_MUL_RCPT_BOUNCE) == 0) {
+ if (state->sender && *state->sender == 0 && state->rcpt_count
+ > (strcmp(state->where, SMTPD_CMD_RCPT) != 0))
+ status = smtpd_check_reject(state, MAIL_ERROR_POLICY,
+ var_mul_rcpt_code, "5.5.3",
+ "<%s>: %s rejected: Multi-recipient bounce",
+ reply_name, reply_class);
+ } else if (strcasecmp(name, REJECT_UNVERIFIED_RECIP) == 0) {
+ if (state->recipient && *state->recipient)
+ status = reject_unverified_address(state, state->recipient,
+ state->recipient, SMTPD_NAME_RECIPIENT,
+ var_unv_rcpt_dcode, var_unv_rcpt_rcode,
+ unv_rcpt_tf_act,
+ var_unv_rcpt_why);
+ }
+
+ /*
+ * ETRN domain name restrictions.
+ */
+ else if (is_map_command(state, name, CHECK_ETRN_ACL, &cpp)) {
+ if (state->etrn_name)
+ status = check_domain_access(state, *cpp, state->etrn_name,
+ FULL, &found, state->etrn_name,
+ SMTPD_NAME_ETRN, def_acl);
+ }
+
+ /*
+ * User-defined restriction class.
+ */
+ else if ((list = (ARGV *) htable_find(smtpd_rest_classes, name)) != 0) {
+ status = generic_checks(state, list, reply_name,
+ reply_class, def_acl);
+ }
+
+ /*
+ * Error: undefined restriction name.
+ */
+ else {
+ msg_warn("unknown smtpd restriction: \"%s\"", name);
+ reject_server_error(state);
+ }
+ if (msg_verbose)
+ msg_info("%s: name=%s status=%d", myname, name, status);
+
+ if (status < 0) {
+ if (status == DICT_ERR_RETRY)
+ reject_dict_retry(state, reply_name);
+ else
+ reject_server_error(state);
+ }
+ if (state->warn_if_reject >= state->recursion)
+ state->warn_if_reject = 0;
+
+ if (status != 0)
+ break;
+
+ if (state->defer_if_permit.active && state->defer_if_reject.active)
+ break;
+ }
+ if (msg_verbose)
+ msg_info(">>> END %s RESTRICTIONS <<<", reply_class);
+
+ state->recursion = saved_recursion;
+
+ /* In case the list terminated with one or more warn_if_mumble. */
+ if (state->warn_if_reject >= state->recursion)
+ state->warn_if_reject = 0;
+
+ return (status);
+}
+
+/* smtpd_check_addr - address sanity check */
+
+int smtpd_check_addr(const char *sender, const char *addr, int smtputf8)
+{
+ const RESOLVE_REPLY *resolve_reply;
+ const char *myname = "smtpd_check_addr";
+ const char *domain;
+
+ if (msg_verbose)
+ msg_info("%s: addr=%s", myname, addr);
+
+ /*
+ * Catch syntax errors early on if we can, but be prepared to re-compute
+ * the result later when the cache fills up with lots of recipients, at
+ * which time errors can still happen.
+ */
+ if (addr == 0 || *addr == 0)
+ return (0);
+ resolve_reply = smtpd_resolve_addr(sender, addr);
+ if (resolve_reply->flags & RESOLVE_FLAG_ERROR)
+ return (-1);
+
+ /*
+ * Backwards compatibility: if the client does not request SMTPUTF8
+ * support, then behave like Postfix < 3.0 trivial-rewrite, and don't
+ * allow non-ASCII email domains. Historically, Postfix does not reject
+ * UTF8 etc. in the address localpart.
+ */
+ if (smtputf8 == 0
+ && (domain = strrchr(STR(resolve_reply->recipient), '@')) != 0
+ && *(domain += 1) != 0 && !allascii(domain))
+ return (-1);
+
+ return (0);
+}
+
+/* smtpd_check_rewrite - choose address qualification context */
+
+char *smtpd_check_rewrite(SMTPD_STATE *state)
+{
+ const char *myname = "smtpd_check_rewrite";
+ int status;
+ char **cpp;
+ MAPS *maps;
+ char *name;
+
+ /*
+ * We don't use generic_checks() because it produces results that aren't
+ * applicable such as DEFER or REJECT.
+ */
+ for (cpp = local_rewrite_clients->argv; *cpp != 0; cpp++) {
+ if (msg_verbose)
+ msg_info("%s: trying: %s", myname, *cpp);
+ status = SMTPD_CHECK_DUNNO;
+ if (strchr(name = *cpp, ':') != 0) {
+ name = CHECK_ADDR_MAP;
+ cpp -= 1;
+ }
+ if (strcasecmp(name, PERMIT_INET_INTERFACES) == 0) {
+ status = permit_inet_interfaces(state);
+ } else if (strcasecmp(name, PERMIT_MYNETWORKS) == 0) {
+ status = permit_mynetworks(state);
+ } else if (is_map_command(state, name, CHECK_ADDR_MAP, &cpp)) {
+ if ((maps = (MAPS *) htable_find(map_command_table, *cpp)) == 0)
+ msg_panic("%s: dictionary not found: %s", myname, *cpp);
+ if (maps_find(maps, state->addr, 0) != 0)
+ status = SMTPD_CHECK_OK;
+ else if (maps->error != 0) {
+ /* Warning is already logged. */
+ status = maps->error;
+ }
+ } else if (strcasecmp(name, PERMIT_SASL_AUTH) == 0) {
+#ifdef USE_SASL_AUTH
+ if (smtpd_sasl_is_active(state))
+ status = permit_sasl_auth(state, SMTPD_CHECK_OK,
+ SMTPD_CHECK_DUNNO);
+#endif
+ } else if (strcasecmp(name, PERMIT_TLS_ALL_CLIENTCERTS) == 0) {
+ status = permit_tls_clientcerts(state, 1);
+ } else if (strcasecmp(name, PERMIT_TLS_CLIENTCERTS) == 0) {
+ status = permit_tls_clientcerts(state, 0);
+ } else {
+ msg_warn("parameter %s: invalid request: %s",
+ VAR_LOC_RWR_CLIENTS, name);
+ continue;
+ }
+ if (status < 0) {
+ if (status == DICT_ERR_RETRY) {
+ state->error_mask |= MAIL_ERROR_RESOURCE;
+ log_whatsup(state, "reject",
+ "451 4.3.0 Temporary lookup error");
+ return ("451 4.3.0 Temporary lookup error");
+ } else {
+ state->error_mask |= MAIL_ERROR_SOFTWARE;
+ log_whatsup(state, "reject",
+ "451 4.3.5 Server configuration error");
+ return ("451 4.3.5 Server configuration error");
+ }
+ }
+ if (status == SMTPD_CHECK_OK) {
+ state->rewrite_context = MAIL_ATTR_RWR_LOCAL;
+ return (0);
+ }
+ }
+ state->rewrite_context = MAIL_ATTR_RWR_REMOTE;
+ return (0);
+}
+
+/* smtpd_check_client - validate client name or address */
+
+char *smtpd_check_client(SMTPD_STATE *state)
+{
+ int status;
+
+ /*
+ * Initialize.
+ */
+ if (state->name == 0 || state->addr == 0)
+ return (0);
+
+#define SMTPD_CHECK_RESET() { \
+ state->recursion = 0; \
+ state->warn_if_reject = 0; \
+ state->defer_if_reject.active = 0; \
+ }
+
+ /*
+ * Reset the defer_if_permit flag.
+ */
+ state->defer_if_permit.active = 0;
+
+ /*
+ * Apply restrictions in the order as specified.
+ */
+ SMTPD_CHECK_RESET();
+ status = setjmp(smtpd_check_buf);
+ if (status == 0 && client_restrctions->argc)
+ status = generic_checks(state, client_restrctions, state->namaddr,
+ SMTPD_NAME_CLIENT, CHECK_CLIENT_ACL);
+ state->defer_if_permit_client = state->defer_if_permit.active;
+
+ return (status == SMTPD_CHECK_REJECT ? STR(error_text) : 0);
+}
+
+/* smtpd_check_helo - validate HELO hostname */
+
+char *smtpd_check_helo(SMTPD_STATE *state, char *helohost)
+{
+ int status;
+ char *saved_helo;
+
+ /*
+ * Initialize.
+ */
+ if (helohost == 0)
+ return (0);
+
+ /*
+ * Minor kluge so that we can delegate work to the generic routine and so
+ * that we can syslog the recipient with the reject messages.
+ */
+#define SMTPD_CHECK_PUSH(backup, current, new) { \
+ backup = current; \
+ current = (new ? mystrdup(new) : 0); \
+ }
+
+#define SMTPD_CHECK_POP(current, backup) { \
+ if (current) myfree(current); \
+ current = backup; \
+ }
+
+ SMTPD_CHECK_PUSH(saved_helo, state->helo_name, helohost);
+
+#define SMTPD_CHECK_HELO_RETURN(x) { \
+ SMTPD_CHECK_POP(state->helo_name, saved_helo); \
+ return (x); \
+ }
+
+ /*
+ * Restore the defer_if_permit flag to its value before HELO/EHLO, and do
+ * not set the flag when it was already raised by a previous protocol
+ * stage.
+ */
+ state->defer_if_permit.active = state->defer_if_permit_client;
+
+ /*
+ * Apply restrictions in the order as specified.
+ */
+ SMTPD_CHECK_RESET();
+ status = setjmp(smtpd_check_buf);
+ if (status == 0 && helo_restrctions->argc)
+ status = generic_checks(state, helo_restrctions, state->helo_name,
+ SMTPD_NAME_HELO, CHECK_HELO_ACL);
+ state->defer_if_permit_helo = state->defer_if_permit.active;
+
+ SMTPD_CHECK_HELO_RETURN(status == SMTPD_CHECK_REJECT ? STR(error_text) : 0);
+}
+
+/* smtpd_check_mail - validate sender address, driver */
+
+char *smtpd_check_mail(SMTPD_STATE *state, char *sender)
+{
+ int status;
+ char *saved_sender;
+
+ /*
+ * Initialize.
+ */
+ if (sender == 0)
+ return (0);
+
+ /*
+ * Minor kluge so that we can delegate work to the generic routine and so
+ * that we can syslog the recipient with the reject messages.
+ */
+ SMTPD_CHECK_PUSH(saved_sender, state->sender, sender);
+
+#define SMTPD_CHECK_MAIL_RETURN(x) { \
+ SMTPD_CHECK_POP(state->sender, saved_sender); \
+ return (x); \
+ }
+
+ /*
+ * Restore the defer_if_permit flag to its value before MAIL FROM, and do
+ * not set the flag when it was already raised by a previous protocol
+ * stage. The client may skip the helo/ehlo.
+ */
+ state->defer_if_permit.active = state->defer_if_permit_client
+ | state->defer_if_permit_helo;
+ state->sender_rcptmap_checked = 0;
+
+ /*
+ * Apply restrictions in the order as specified.
+ */
+ SMTPD_CHECK_RESET();
+ status = setjmp(smtpd_check_buf);
+ if (status == 0 && mail_restrctions->argc)
+ status = generic_checks(state, mail_restrctions, sender,
+ SMTPD_NAME_SENDER, CHECK_SENDER_ACL);
+ state->defer_if_permit_sender = state->defer_if_permit.active;
+
+ /*
+ * If the "reject_unlisted_sender" restriction still needs to be applied,
+ * validate the sender here.
+ */
+ if (var_smtpd_rej_unl_from
+ && status != SMTPD_CHECK_REJECT && state->sender_rcptmap_checked == 0
+ && state->discard == 0 && *sender)
+ status = check_sender_rcpt_maps(state, sender);
+
+ SMTPD_CHECK_MAIL_RETURN(status == SMTPD_CHECK_REJECT ? STR(error_text) : 0);
+}
+
+/* smtpd_check_rcpt - validate recipient address, driver */
+
+char *smtpd_check_rcpt(SMTPD_STATE *state, char *recipient)
+{
+ int status;
+ char *saved_recipient;
+ char *err;
+ ARGV *restrctions[2];
+ int n;
+
+ /*
+ * Initialize.
+ */
+ if (recipient == 0)
+ return (0);
+
+ /*
+ * XXX 2821: Section 3.6 requires that "postmaster" be accepted even when
+ * specified without a fully qualified domain name.
+ */
+ if (strcasecmp(recipient, "postmaster") == 0)
+ return (0);
+
+ /*
+ * Minor kluge so that we can delegate work to the generic routine and so
+ * that we can syslog the recipient with the reject messages.
+ */
+ SMTPD_CHECK_PUSH(saved_recipient, state->recipient, recipient);
+
+#define SMTPD_CHECK_RCPT_RETURN(x) { \
+ SMTPD_CHECK_POP(state->recipient, saved_recipient); \
+ return (x); \
+ }
+
+ /*
+ * The "check_recipient_maps" restriction is relevant only when
+ * responding to RCPT TO or VRFY.
+ */
+ state->recipient_rcptmap_checked = 0;
+
+ /*
+ * Apply delayed restrictions.
+ */
+ if (var_smtpd_delay_reject)
+ if ((err = smtpd_check_client(state)) != 0
+ || (err = smtpd_check_helo(state, state->helo_name)) != 0
+ || (err = smtpd_check_mail(state, state->sender)) != 0)
+ SMTPD_CHECK_RCPT_RETURN(err);
+
+ /*
+ * Restore the defer_if_permit flag to its value before RCPT TO, and do
+ * not set the flag when it was already raised by a previous protocol
+ * stage.
+ */
+ state->defer_if_permit.active = state->defer_if_permit_sender;
+
+ /*
+ * Apply restrictions in the order as specified. We allow relay
+ * restrictions to be empty, for sites that require backwards
+ * compatibility.
+ *
+ * If compatibility_level < 1 and smtpd_relay_restrictions is left at its
+ * default value, find out if the new smtpd_relay_restrictions default
+ * value would block the request, without logging REJECT messages.
+ * Approach: evaluate fake relay restrictions (permit_mynetworks,
+ * permit_sasl_authenticated, permit_auth_destination) and log a warning
+ * if the result is DUNNO instead of OK, i.e. a reject_unauth_destinatin
+ * at the end would have blocked the request.
+ */
+ SMTPD_CHECK_RESET();
+ restrctions[0] = rcpt_restrctions;
+ restrctions[1] = warn_compat_break_relay_restrictions ?
+ fake_relay_restrctions : relay_restrctions;
+ for (n = 0; n < 2; n++) {
+ status = setjmp(smtpd_check_buf);
+ if (status == 0 && restrctions[n]->argc)
+ status = generic_checks(state, restrctions[n],
+ recipient, SMTPD_NAME_RECIPIENT, CHECK_RECIP_ACL);
+ if (n == 1 && warn_compat_break_relay_restrictions
+ && status == SMTPD_CHECK_DUNNO) {
+ msg_info("using backwards-compatible default setting \""
+ VAR_RELAY_CHECKS " = (empty)\" to avoid \"Relay "
+ "access denied\" error for recipient \"%s\" from "
+ "client \"%s\"", state->recipient, state->namaddr);
+ }
+ if (status == SMTPD_CHECK_REJECT)
+ break;
+ }
+
+ /*
+ * Force permission into deferral when some earlier temporary error may
+ * have prevented us from rejecting mail, and report the earlier problem.
+ */
+ if (status != SMTPD_CHECK_REJECT && state->defer_if_permit.active)
+ status = smtpd_check_reject(state, state->defer_if_permit.class,
+ state->defer_if_permit.code,
+ STR(state->defer_if_permit.dsn),
+ "%s", STR(state->defer_if_permit.reason));
+
+ /*
+ * If the "reject_unlisted_recipient" restriction still needs to be
+ * applied, validate the recipient here.
+ */
+ if (var_smtpd_rej_unl_rcpt
+ && status != SMTPD_CHECK_REJECT
+ && state->recipient_rcptmap_checked == 0
+ && state->discard == 0)
+ status = check_recipient_rcpt_maps(state, recipient);
+
+ SMTPD_CHECK_RCPT_RETURN(status == SMTPD_CHECK_REJECT ? STR(error_text) : 0);
+}
+
+/* smtpd_check_etrn - validate ETRN request */
+
+char *smtpd_check_etrn(SMTPD_STATE *state, char *domain)
+{
+ int status;
+ char *saved_etrn_name;
+ char *err;
+
+ /*
+ * Initialize.
+ */
+ if (domain == 0)
+ return (0);
+
+ /*
+ * Minor kluge so that we can delegate work to the generic routine and so
+ * that we can syslog the recipient with the reject messages.
+ */
+ SMTPD_CHECK_PUSH(saved_etrn_name, state->etrn_name, domain);
+
+#define SMTPD_CHECK_ETRN_RETURN(x) { \
+ SMTPD_CHECK_POP(state->etrn_name, saved_etrn_name); \
+ return (x); \
+ }
+
+ /*
+ * Apply delayed restrictions.
+ */
+ if (var_smtpd_delay_reject)
+ if ((err = smtpd_check_client(state)) != 0
+ || (err = smtpd_check_helo(state, state->helo_name)) != 0)
+ SMTPD_CHECK_ETRN_RETURN(err);
+
+ /*
+ * Restore the defer_if_permit flag to its value before ETRN, and do not
+ * set the flag when it was already raised by a previous protocol stage.
+ * The client may skip the helo/ehlo.
+ */
+ state->defer_if_permit.active = state->defer_if_permit_client
+ | state->defer_if_permit_helo;
+
+ /*
+ * Apply restrictions in the order as specified.
+ */
+ SMTPD_CHECK_RESET();
+ status = setjmp(smtpd_check_buf);
+ if (status == 0 && etrn_restrctions->argc)
+ status = generic_checks(state, etrn_restrctions, domain,
+ SMTPD_NAME_ETRN, CHECK_ETRN_ACL);
+
+ /*
+ * Force permission into deferral when some earlier temporary error may
+ * have prevented us from rejecting mail, and report the earlier problem.
+ */
+ if (status != SMTPD_CHECK_REJECT && state->defer_if_permit.active)
+ status = smtpd_check_reject(state, state->defer_if_permit.class,
+ state->defer_if_permit.code,
+ STR(state->defer_if_permit.dsn),
+ "%s", STR(state->defer_if_permit.reason));
+
+ SMTPD_CHECK_ETRN_RETURN(status == SMTPD_CHECK_REJECT ? STR(error_text) : 0);
+}
+
+/* check_recipient_rcpt_maps - generic_checks() recipient table check */
+
+static int check_recipient_rcpt_maps(SMTPD_STATE *state, const char *recipient)
+{
+
+ /*
+ * Duplicate suppression. There's an implicit check_recipient_maps
+ * restriction at the end of all recipient restrictions.
+ */
+ if (smtpd_input_transp_mask & INPUT_TRANSP_UNKNOWN_RCPT)
+ return (0);
+ if (state->recipient_rcptmap_checked == 1)
+ return (0);
+ if (state->warn_if_reject == 0)
+ /* We really validate the recipient address. */
+ state->recipient_rcptmap_checked = 1;
+ return (check_rcpt_maps(state, state->sender, recipient,
+ SMTPD_NAME_RECIPIENT));
+}
+
+/* check_sender_rcpt_maps - generic_checks() sender table check */
+
+static int check_sender_rcpt_maps(SMTPD_STATE *state, const char *sender)
+{
+
+ /*
+ * Duplicate suppression. There's an implicit check_sender_maps
+ * restriction at the end of all sender restrictions.
+ */
+ if (smtpd_input_transp_mask & INPUT_TRANSP_UNKNOWN_RCPT)
+ return (0);
+ if (state->sender_rcptmap_checked == 1)
+ return (0);
+ if (state->warn_if_reject == 0)
+ /* We really validate the sender address. */
+ state->sender_rcptmap_checked = 1;
+ return (check_rcpt_maps(state, state->recipient, sender,
+ SMTPD_NAME_SENDER));
+}
+
+/* check_rcpt_maps - generic_checks() interface for recipient table check */
+
+static int check_rcpt_maps(SMTPD_STATE *state, const char *sender,
+ const char *recipient,
+ const char *reply_class)
+{
+ const RESOLVE_REPLY *reply;
+ DSN_SPLIT dp;
+
+ if (msg_verbose)
+ msg_info(">>> CHECKING %s VALIDATION MAPS <<<", reply_class);
+
+ /*
+ * Resolve the address.
+ */
+ reply = smtpd_resolve_addr(sender, recipient);
+ if (reply->flags & RESOLVE_FLAG_FAIL)
+ reject_dict_retry(state, recipient);
+
+ /*
+ * Make complex expressions more readable?
+ */
+#define MATCH(map, rcpt) \
+ check_mail_addr_find(state, recipient, map, rcpt, (char **) 0)
+
+#define NOMATCH(map, rcpt) (MATCH(map, rcpt) == 0)
+
+ /*
+ * XXX We assume the recipient address is OK if it matches a canonical
+ * map or virtual alias map. Eventually, the address resolver should give
+ * us the final resolved recipient address, and the SMTP server should
+ * write the final resolved recipient address to the output record
+ * stream. See also the next comment block on recipients in virtual alias
+ * domains.
+ */
+ if (MATCH(rcpt_canon_maps, CONST_STR(reply->recipient))
+ || (strcmp(reply_class, SMTPD_NAME_SENDER) == 0
+ && MATCH(send_canon_maps, CONST_STR(reply->recipient)))
+ || MATCH(canonical_maps, CONST_STR(reply->recipient))
+ || MATCH(virt_alias_maps, CONST_STR(reply->recipient)))
+ return (0);
+
+ /*
+ * At this point, anything that resolves to the error mailer is known to
+ * be undeliverable.
+ *
+ * XXX Until the address resolver does final address resolution, known and
+ * unknown recipients in virtual alias domains will both resolve to
+ * "error:user unknown".
+ */
+ if (strcmp(STR(reply->transport), MAIL_SERVICE_ERROR) == 0) {
+ dsn_split(&dp, strcmp(reply_class, SMTPD_NAME_SENDER) == 0 ?
+ "5.1.0" : "5.1.1", STR(reply->nexthop));
+ return (smtpd_check_reject(state, MAIL_ERROR_BOUNCE,
+ (reply->flags & RESOLVE_CLASS_ALIAS) ?
+ var_virt_alias_code : 550,
+ smtpd_dsn_fix(DSN_STATUS(dp.dsn),
+ reply_class),
+ "<%s>: %s rejected: %s",
+ recipient, reply_class,
+ dp.text));
+ }
+ if (strcmp(STR(reply->transport), MAIL_SERVICE_RETRY) == 0) {
+ dsn_split(&dp, strcmp(reply_class, SMTPD_NAME_SENDER) == 0 ?
+ "4.1.0" : "4.1.1", STR(reply->nexthop));
+ return (smtpd_check_reject(state, MAIL_ERROR_BOUNCE, 450,
+ smtpd_dsn_fix(DSN_STATUS(dp.dsn),
+ reply_class),
+ "<%s>: %s rejected: %s",
+ recipient, reply_class,
+ dp.text));
+ }
+
+ /*
+ * Search the recipient lookup tables of the respective address class.
+ *
+ * XXX Use the less expensive maps_find() (built-in case folding) instead of
+ * the baroque mail_addr_find(). But then we have to strip the domain and
+ * deal with address extensions ourselves.
+ *
+ * XXX But that would break sites that use the virtual delivery agent for
+ * local delivery, because the virtual delivery agent requires
+ * user@domain style addresses in its user database.
+ */
+#define MATCH_LEFT(l, r, n) \
+ (strncasecmp_utf8((l), (r), (n)) == 0 && (r)[n] == '@')
+
+ switch (reply->flags & RESOLVE_CLASS_MASK) {
+
+ /*
+ * Reject mail to unknown addresses in local domains (domains that
+ * match $mydestination or ${proxy,inet}_interfaces).
+ */
+ case RESOLVE_CLASS_LOCAL:
+ if (*var_local_rcpt_maps
+ /* Generated by bounce, absorbed by qmgr. */
+ && !MATCH_LEFT(var_double_bounce_sender, CONST_STR(reply->recipient),
+ strlen(var_double_bounce_sender))
+ /* Absorbed by qmgr. */
+ && !MATCH_LEFT(MAIL_ADDR_POSTMASTER, CONST_STR(reply->recipient),
+ strlen(MAIL_ADDR_POSTMASTER))
+ /* Generated by bounce. */
+ && !MATCH_LEFT(MAIL_ADDR_MAIL_DAEMON, CONST_STR(reply->recipient),
+ strlen(MAIL_ADDR_MAIL_DAEMON))
+ && NOMATCH(local_rcpt_maps, CONST_STR(reply->recipient)))
+ return (smtpd_check_reject(state, MAIL_ERROR_BOUNCE,
+ var_local_rcpt_code,
+ strcmp(reply_class, SMTPD_NAME_SENDER) == 0 ?
+ "5.1.0" : "5.1.1",
+ "<%s>: %s rejected: User unknown%s",
+ recipient, reply_class,
+ var_show_unk_rcpt_table ?
+ " in local recipient table" : ""));
+ break;
+
+ /*
+ * Reject mail to unknown addresses in virtual mailbox domains.
+ */
+ case RESOLVE_CLASS_VIRTUAL:
+ if (*var_virt_mailbox_maps
+ && NOMATCH(virt_mailbox_maps, CONST_STR(reply->recipient)))
+ return (smtpd_check_reject(state, MAIL_ERROR_BOUNCE,
+ var_virt_mailbox_code,
+ strcmp(reply_class, SMTPD_NAME_SENDER) == 0 ?
+ "5.1.0" : "5.1.1",
+ "<%s>: %s rejected: User unknown%s",
+ recipient, reply_class,
+ var_show_unk_rcpt_table ?
+ " in virtual mailbox table" : ""));
+ break;
+
+ /*
+ * Reject mail to unknown addresses in relay domains.
+ */
+ case RESOLVE_CLASS_RELAY:
+ if (*var_relay_rcpt_maps
+ && NOMATCH(relay_rcpt_maps, CONST_STR(reply->recipient)))
+ return (smtpd_check_reject(state, MAIL_ERROR_BOUNCE,
+ var_relay_rcpt_code,
+ strcmp(reply_class, SMTPD_NAME_SENDER) == 0 ?
+ "5.1.0" : "5.1.1",
+ "<%s>: %s rejected: User unknown%s",
+ recipient, reply_class,
+ var_show_unk_rcpt_table ?
+ " in relay recipient table" : ""));
+ if (warn_compat_break_relay_domains)
+ msg_info("using backwards-compatible default setting "
+ VAR_RELAY_DOMAINS "=$mydestination to accept mail "
+ "for address \"%s\"", recipient);
+ break;
+ }
+
+ /*
+ * Accept all other addresses - including addresses that passed the above
+ * tests because of some table lookup problem.
+ */
+ return (0);
+}
+
+/* smtpd_check_size - check optional SIZE parameter value */
+
+char *smtpd_check_size(SMTPD_STATE *state, off_t size)
+{
+ int status;
+
+ /*
+ * Return here in case of serious trouble.
+ */
+ SMTPD_CHECK_RESET();
+ if ((status = setjmp(smtpd_check_buf)) != 0)
+ return (status == SMTPD_CHECK_REJECT ? STR(error_text) : 0);
+
+ /*
+ * Check against file size limit.
+ */
+ if (var_message_limit > 0 && size > var_message_limit) {
+ (void) smtpd_check_reject(state, MAIL_ERROR_POLICY,
+ 552, "5.3.4",
+ "Message size exceeds fixed limit");
+ return (STR(error_text));
+ }
+ return (0);
+}
+
+/* smtpd_check_queue - check queue space */
+
+char *smtpd_check_queue(SMTPD_STATE *state)
+{
+ const char *myname = "smtpd_check_queue";
+ struct fsspace fsbuf;
+ int status;
+
+ /*
+ * Return here in case of serious trouble.
+ */
+ SMTPD_CHECK_RESET();
+ if ((status = setjmp(smtpd_check_buf)) != 0)
+ return (status == SMTPD_CHECK_REJECT ? STR(error_text) : 0);
+
+ /*
+ * Avoid overflow/underflow when comparing message size against available
+ * space.
+ */
+#define BLOCKS(x) ((x) / fsbuf.block_size)
+
+ fsspace(".", &fsbuf);
+ if (msg_verbose)
+ msg_info("%s: blocks %lu avail %lu min_free %lu msg_size_limit %lu",
+ myname,
+ (unsigned long) fsbuf.block_size,
+ (unsigned long) fsbuf.block_free,
+ (unsigned long) var_queue_minfree,
+ (unsigned long) var_message_limit);
+ if (BLOCKS(var_queue_minfree) >= fsbuf.block_free
+ || BLOCKS(var_message_limit) >= fsbuf.block_free / smtpd_space_multf) {
+ (void) smtpd_check_reject(state, MAIL_ERROR_RESOURCE,
+ 452, "4.3.1",
+ "Insufficient system storage");
+ msg_warn("not enough free space in mail queue: %lu bytes < "
+ "%g*message size limit",
+ (unsigned long) fsbuf.block_free * fsbuf.block_size,
+ smtpd_space_multf);
+ return (STR(error_text));
+ }
+ return (0);
+}
+
+/* smtpd_check_data - check DATA command */
+
+char *smtpd_check_data(SMTPD_STATE *state)
+{
+ int status;
+ char *NOCLOBBER saved_recipient;
+
+ /*
+ * Minor kluge so that we can delegate work to the generic routine. We
+ * provide no recipient information in the case of multiple recipients,
+ * This restriction applies to all recipients alike, and logging only one
+ * of them would be misleading.
+ */
+ if (state->rcpt_count > 1) {
+ saved_recipient = state->recipient;
+ state->recipient = 0;
+ }
+
+ /*
+ * Reset the defer_if_permit flag. This is necessary when some recipients
+ * were accepted but the last one was rejected.
+ */
+ state->defer_if_permit.active = 0;
+
+ /*
+ * Apply restrictions in the order as specified.
+ *
+ * XXX We cannot specify a default target for a bare access map.
+ */
+ SMTPD_CHECK_RESET();
+ status = setjmp(smtpd_check_buf);
+ if (status == 0 && data_restrctions->argc)
+ status = generic_checks(state, data_restrctions,
+ SMTPD_CMD_DATA, SMTPD_NAME_DATA, NO_DEF_ACL);
+
+ /*
+ * Force permission into deferral when some earlier temporary error may
+ * have prevented us from rejecting mail, and report the earlier problem.
+ */
+ if (status != SMTPD_CHECK_REJECT && state->defer_if_permit.active)
+ status = smtpd_check_reject(state, state->defer_if_permit.class,
+ state->defer_if_permit.code,
+ STR(state->defer_if_permit.dsn),
+ "%s", STR(state->defer_if_permit.reason));
+
+ if (state->rcpt_count > 1)
+ state->recipient = saved_recipient;
+
+ return (status == SMTPD_CHECK_REJECT ? STR(error_text) : 0);
+}
+
+/* smtpd_check_eod - check end-of-data command */
+
+char *smtpd_check_eod(SMTPD_STATE *state)
+{
+ int status;
+ char *NOCLOBBER saved_recipient;
+
+ /*
+ * Minor kluge so that we can delegate work to the generic routine. We
+ * provide no recipient information in the case of multiple recipients,
+ * This restriction applies to all recipients alike, and logging only one
+ * of them would be misleading.
+ */
+ if (state->rcpt_count > 1) {
+ saved_recipient = state->recipient;
+ state->recipient = 0;
+ }
+
+ /*
+ * Reset the defer_if_permit flag. This is necessary when some recipients
+ * were accepted but the last one was rejected.
+ */
+ state->defer_if_permit.active = 0;
+
+ /*
+ * Apply restrictions in the order as specified.
+ *
+ * XXX We cannot specify a default target for a bare access map.
+ */
+ SMTPD_CHECK_RESET();
+ status = setjmp(smtpd_check_buf);
+ if (status == 0 && eod_restrictions->argc)
+ status = generic_checks(state, eod_restrictions,
+ SMTPD_CMD_EOD, SMTPD_NAME_EOD, NO_DEF_ACL);
+
+ /*
+ * Force permission into deferral when some earlier temporary error may
+ * have prevented us from rejecting mail, and report the earlier problem.
+ */
+ if (status != SMTPD_CHECK_REJECT && state->defer_if_permit.active)
+ status = smtpd_check_reject(state, state->defer_if_permit.class,
+ state->defer_if_permit.code,
+ STR(state->defer_if_permit.dsn),
+ "%s", STR(state->defer_if_permit.reason));
+
+ if (state->rcpt_count > 1)
+ state->recipient = saved_recipient;
+
+ return (status == SMTPD_CHECK_REJECT ? STR(error_text) : 0);
+}
+
+#ifdef TEST
+
+ /*
+ * Test program to try out all these restrictions without having to go live.
+ * This is not entirely stand-alone, as it requires access to the Postfix
+ * rewrite/resolve service. This is just for testing code, not for debugging
+ * configuration files.
+ */
+#include <stdlib.h>
+
+#include <msg_vstream.h>
+#include <vstring_vstream.h>
+
+#include <mail_conf.h>
+#include <rewrite_clnt.h>
+#include <dns.h>
+
+#include <smtpd_chat.h>
+
+int smtpd_input_transp_mask;
+
+ /*
+ * Dummies. These are never set.
+ */
+char *var_client_checks = "";
+char *var_helo_checks = "";
+char *var_mail_checks = "";
+char *var_relay_checks = "";
+char *var_rcpt_checks = "";
+char *var_etrn_checks = "";
+char *var_data_checks = "";
+char *var_eod_checks = "";
+char *var_relay_domains = "";
+char *var_smtpd_uproxy_proto = "";
+int var_smtpd_uproxy_tmout = 0;
+
+#ifdef USE_TLS
+char *var_relay_ccerts = "";
+
+#endif
+char *var_mynetworks = "";
+char *var_notify_classes = "";
+char *var_smtpd_policy_def_action = "";
+char *var_smtpd_policy_context = "";
+
+ /*
+ * String-valued configuration parameters.
+ */
+char *var_maps_rbl_domains;
+char *var_myorigin;
+char *var_mydest;
+char *var_inet_interfaces;
+char *var_proxy_interfaces;
+char *var_rcpt_delim;
+char *var_rest_classes;
+char *var_alias_maps;
+char *var_send_canon_maps;
+char *var_rcpt_canon_maps;
+char *var_canonical_maps;
+char *var_virt_alias_maps;
+char *var_virt_alias_doms;
+char *var_virt_mailbox_maps;
+char *var_virt_mailbox_doms;
+char *var_local_rcpt_maps;
+char *var_perm_mx_networks;
+char *var_par_dom_match;
+char *var_smtpd_null_key;
+char *var_smtpd_snd_auth_maps;
+char *var_double_bounce_sender;
+char *var_rbl_reply_maps;
+char *var_smtpd_exp_filter;
+char *var_def_rbl_reply;
+char *var_relay_rcpt_maps;
+char *var_verify_sender;
+char *var_smtpd_sasl_opts;
+char *var_local_rwr_clients;
+char *var_smtpd_relay_ccerts;
+char *var_unv_from_why;
+char *var_unv_rcpt_why;
+char *var_stress;
+char *var_unk_name_tf_act;
+char *var_unk_addr_tf_act;
+char *var_unv_rcpt_tf_act;
+char *var_unv_from_tf_act;
+char *var_smtpd_acl_perm_log;
+
+typedef struct {
+ char *name;
+ char *defval;
+ char **target;
+} STRING_TABLE;
+
+#undef DEF_VIRT_ALIAS_MAPS
+#define DEF_VIRT_ALIAS_MAPS ""
+
+#undef DEF_LOCAL_RCPT_MAPS
+#define DEF_LOCAL_RCPT_MAPS ""
+
+static const STRING_TABLE string_table[] = {
+ VAR_MAPS_RBL_DOMAINS, DEF_MAPS_RBL_DOMAINS, &var_maps_rbl_domains,
+ VAR_MYORIGIN, DEF_MYORIGIN, &var_myorigin,
+ VAR_MYDEST, DEF_MYDEST, &var_mydest,
+ VAR_INET_INTERFACES, DEF_INET_INTERFACES, &var_inet_interfaces,
+ VAR_PROXY_INTERFACES, DEF_PROXY_INTERFACES, &var_proxy_interfaces,
+ VAR_RCPT_DELIM, DEF_RCPT_DELIM, &var_rcpt_delim,
+ VAR_REST_CLASSES, DEF_REST_CLASSES, &var_rest_classes,
+ VAR_ALIAS_MAPS, DEF_ALIAS_MAPS, &var_alias_maps,
+ VAR_SEND_CANON_MAPS, DEF_SEND_CANON_MAPS, &var_send_canon_maps,
+ VAR_RCPT_CANON_MAPS, DEF_RCPT_CANON_MAPS, &var_rcpt_canon_maps,
+ VAR_CANONICAL_MAPS, DEF_CANONICAL_MAPS, &var_canonical_maps,
+ VAR_VIRT_ALIAS_MAPS, DEF_VIRT_ALIAS_MAPS, &var_virt_alias_maps,
+ VAR_VIRT_ALIAS_DOMS, DEF_VIRT_ALIAS_DOMS, &var_virt_alias_doms,
+ VAR_VIRT_MAILBOX_MAPS, DEF_VIRT_MAILBOX_MAPS, &var_virt_mailbox_maps,
+ VAR_VIRT_MAILBOX_DOMS, DEF_VIRT_MAILBOX_DOMS, &var_virt_mailbox_doms,
+ VAR_LOCAL_RCPT_MAPS, DEF_LOCAL_RCPT_MAPS, &var_local_rcpt_maps,
+ VAR_PERM_MX_NETWORKS, DEF_PERM_MX_NETWORKS, &var_perm_mx_networks,
+ VAR_PAR_DOM_MATCH, DEF_PAR_DOM_MATCH, &var_par_dom_match,
+ VAR_SMTPD_SND_AUTH_MAPS, DEF_SMTPD_SND_AUTH_MAPS, &var_smtpd_snd_auth_maps,
+ VAR_SMTPD_NULL_KEY, DEF_SMTPD_NULL_KEY, &var_smtpd_null_key,
+ VAR_DOUBLE_BOUNCE, DEF_DOUBLE_BOUNCE, &var_double_bounce_sender,
+ VAR_RBL_REPLY_MAPS, DEF_RBL_REPLY_MAPS, &var_rbl_reply_maps,
+ VAR_SMTPD_EXP_FILTER, DEF_SMTPD_EXP_FILTER, &var_smtpd_exp_filter,
+ VAR_DEF_RBL_REPLY, DEF_DEF_RBL_REPLY, &var_def_rbl_reply,
+ VAR_RELAY_RCPT_MAPS, DEF_RELAY_RCPT_MAPS, &var_relay_rcpt_maps,
+ VAR_VERIFY_SENDER, DEF_VERIFY_SENDER, &var_verify_sender,
+ VAR_MAIL_NAME, DEF_MAIL_NAME, &var_mail_name,
+ VAR_SMTPD_SASL_OPTS, DEF_SMTPD_SASL_OPTS, &var_smtpd_sasl_opts,
+ VAR_LOC_RWR_CLIENTS, DEF_LOC_RWR_CLIENTS, &var_local_rwr_clients,
+ VAR_RELAY_CCERTS, DEF_RELAY_CCERTS, &var_smtpd_relay_ccerts,
+ VAR_UNV_FROM_WHY, DEF_UNV_FROM_WHY, &var_unv_from_why,
+ VAR_UNV_RCPT_WHY, DEF_UNV_RCPT_WHY, &var_unv_rcpt_why,
+ VAR_STRESS, DEF_STRESS, &var_stress,
+ /* XXX Can't use ``$name'' type default values below. */
+ VAR_UNK_NAME_TF_ACT, DEF_REJECT_TMPF_ACT, &var_unk_name_tf_act,
+ VAR_UNK_ADDR_TF_ACT, DEF_REJECT_TMPF_ACT, &var_unk_addr_tf_act,
+ VAR_UNV_RCPT_TF_ACT, DEF_REJECT_TMPF_ACT, &var_unv_rcpt_tf_act,
+ VAR_UNV_FROM_TF_ACT, DEF_REJECT_TMPF_ACT, &var_unv_from_tf_act,
+ /* XXX Can't use ``$name'' type default values above. */
+ VAR_SMTPD_ACL_PERM_LOG, DEF_SMTPD_ACL_PERM_LOG, &var_smtpd_acl_perm_log,
+ VAR_SMTPD_DNS_RE_FILTER, DEF_SMTPD_DNS_RE_FILTER, &var_smtpd_dns_re_filter,
+ 0,
+};
+
+/* string_init - initialize string parameters */
+
+static void string_init(void)
+{
+ const STRING_TABLE *sp;
+
+ for (sp = string_table; sp->name; sp++)
+ sp->target[0] = mystrdup(sp->defval);
+}
+
+/* string_update - update string parameter */
+
+static int string_update(char **argv)
+{
+ const STRING_TABLE *sp;
+
+ for (sp = string_table; sp->name; sp++) {
+ if (strcasecmp(argv[0], sp->name) == 0) {
+ myfree(sp->target[0]);
+ sp->target[0] = mystrdup(argv[1]);
+ return (1);
+ }
+ }
+ return (0);
+}
+
+ /*
+ * Integer parameters.
+ */
+int var_queue_minfree; /* XXX use off_t */
+typedef struct {
+ char *name;
+ int defval;
+ int *target;
+} INT_TABLE;
+
+int var_unk_client_code;
+int var_bad_name_code;
+int var_unk_name_code;
+int var_unk_addr_code;
+int var_relay_code;
+int var_maps_rbl_code;
+int var_map_reject_code;
+int var_map_defer_code;
+int var_reject_code;
+int var_defer_code;
+int var_non_fqdn_code;
+int var_smtpd_delay_reject;
+int var_allow_untrust_route;
+int var_mul_rcpt_code;
+int var_unv_from_rcode;
+int var_unv_from_dcode;
+int var_unv_rcpt_rcode;
+int var_unv_rcpt_dcode;
+int var_local_rcpt_code;
+int var_relay_rcpt_code;
+int var_virt_mailbox_code;
+int var_virt_alias_code;
+int var_show_unk_rcpt_table;
+int var_verify_poll_count;
+int var_verify_poll_delay;
+int var_smtpd_policy_tmout;
+int var_smtpd_policy_idle;
+int var_smtpd_policy_ttl;
+int var_smtpd_policy_req_limit;
+int var_smtpd_policy_try_limit;
+int var_smtpd_policy_try_delay;
+int var_smtpd_rej_unl_from;
+int var_smtpd_rej_unl_rcpt;
+int var_plaintext_code;
+bool var_smtpd_peername_lookup;
+bool var_smtpd_client_port_log;
+char *var_smtpd_dns_re_filter;
+
+#define int_table test_int_table
+
+static const INT_TABLE int_table[] = {
+ "msg_verbose", 0, &msg_verbose,
+ VAR_UNK_CLIENT_CODE, DEF_UNK_CLIENT_CODE, &var_unk_client_code,
+ VAR_BAD_NAME_CODE, DEF_BAD_NAME_CODE, &var_bad_name_code,
+ VAR_UNK_NAME_CODE, DEF_UNK_NAME_CODE, &var_unk_name_code,
+ VAR_UNK_ADDR_CODE, DEF_UNK_ADDR_CODE, &var_unk_addr_code,
+ VAR_RELAY_CODE, DEF_RELAY_CODE, &var_relay_code,
+ VAR_MAPS_RBL_CODE, DEF_MAPS_RBL_CODE, &var_maps_rbl_code,
+ VAR_MAP_REJECT_CODE, DEF_MAP_REJECT_CODE, &var_map_reject_code,
+ VAR_MAP_DEFER_CODE, DEF_MAP_DEFER_CODE, &var_map_defer_code,
+ VAR_REJECT_CODE, DEF_REJECT_CODE, &var_reject_code,
+ VAR_DEFER_CODE, DEF_DEFER_CODE, &var_defer_code,
+ VAR_NON_FQDN_CODE, DEF_NON_FQDN_CODE, &var_non_fqdn_code,
+ VAR_SMTPD_DELAY_REJECT, DEF_SMTPD_DELAY_REJECT, &var_smtpd_delay_reject,
+ VAR_ALLOW_UNTRUST_ROUTE, DEF_ALLOW_UNTRUST_ROUTE, &var_allow_untrust_route,
+ VAR_MUL_RCPT_CODE, DEF_MUL_RCPT_CODE, &var_mul_rcpt_code,
+ VAR_UNV_FROM_RCODE, DEF_UNV_FROM_RCODE, &var_unv_from_rcode,
+ VAR_UNV_FROM_DCODE, DEF_UNV_FROM_DCODE, &var_unv_from_dcode,
+ VAR_UNV_RCPT_RCODE, DEF_UNV_RCPT_RCODE, &var_unv_rcpt_rcode,
+ VAR_UNV_RCPT_DCODE, DEF_UNV_RCPT_DCODE, &var_unv_rcpt_dcode,
+ VAR_LOCAL_RCPT_CODE, DEF_LOCAL_RCPT_CODE, &var_local_rcpt_code,
+ VAR_RELAY_RCPT_CODE, DEF_RELAY_RCPT_CODE, &var_relay_rcpt_code,
+ VAR_VIRT_ALIAS_CODE, DEF_VIRT_ALIAS_CODE, &var_virt_alias_code,
+ VAR_VIRT_MAILBOX_CODE, DEF_VIRT_MAILBOX_CODE, &var_virt_mailbox_code,
+ VAR_SHOW_UNK_RCPT_TABLE, DEF_SHOW_UNK_RCPT_TABLE, &var_show_unk_rcpt_table,
+ VAR_VERIFY_POLL_COUNT, 3, &var_verify_poll_count,
+ VAR_SMTPD_REJ_UNL_FROM, DEF_SMTPD_REJ_UNL_FROM, &var_smtpd_rej_unl_from,
+ VAR_SMTPD_REJ_UNL_RCPT, DEF_SMTPD_REJ_UNL_RCPT, &var_smtpd_rej_unl_rcpt,
+ VAR_PLAINTEXT_CODE, DEF_PLAINTEXT_CODE, &var_plaintext_code,
+ VAR_SMTPD_PEERNAME_LOOKUP, DEF_SMTPD_PEERNAME_LOOKUP, &var_smtpd_peername_lookup,
+ VAR_SMTPD_CLIENT_PORT_LOG, DEF_SMTPD_CLIENT_PORT_LOG, &var_smtpd_client_port_log,
+ 0,
+};
+
+/* int_init - initialize int parameters */
+
+static void int_init(void)
+{
+ const INT_TABLE *sp;
+
+ for (sp = int_table; sp->name; sp++)
+ sp->target[0] = sp->defval;
+}
+
+/* int_update - update int parameter */
+
+static int int_update(char **argv)
+{
+ const INT_TABLE *ip;
+
+ for (ip = int_table; ip->name; ip++) {
+ if (strcasecmp(argv[0], ip->name) == 0) {
+ if (!ISDIGIT(*argv[1]))
+ msg_fatal("bad number: %s %s", ip->name, argv[1]);
+ ip->target[0] = atoi(argv[1]);
+ return (1);
+ }
+ }
+ return (0);
+}
+
+ /*
+ * Restrictions.
+ */
+typedef struct {
+ char *name;
+ ARGV **target;
+} REST_TABLE;
+
+static const REST_TABLE rest_table[] = {
+ "client_restrictions", &client_restrctions,
+ "helo_restrictions", &helo_restrctions,
+ "sender_restrictions", &mail_restrctions,
+ "relay_restrictions", &relay_restrctions,
+ "recipient_restrictions", &rcpt_restrctions,
+ "etrn_restrictions", &etrn_restrctions,
+ 0,
+};
+
+/* rest_update - update restriction */
+
+static int rest_update(char **argv)
+{
+ const REST_TABLE *rp;
+
+ for (rp = rest_table; rp->name; rp++) {
+ if (strcasecmp(rp->name, argv[0]) == 0) {
+ argv_free(rp->target[0]);
+ rp->target[0] = smtpd_check_parse(SMTPD_CHECK_PARSE_ALL, argv[1]);
+ return (1);
+ }
+ }
+ return (0);
+}
+
+/* rest_class - (re)define a restriction class */
+
+static void rest_class(char *class)
+{
+ char *cp = class;
+ char *name;
+ HTABLE_INFO *entry;
+
+ if (smtpd_rest_classes == 0)
+ smtpd_rest_classes = htable_create(1);
+
+ if ((name = mystrtok(&cp, CHARS_COMMA_SP)) == 0)
+ msg_panic("rest_class: null class name");
+ if ((entry = htable_locate(smtpd_rest_classes, name)) != 0)
+ argv_free((ARGV *) entry->value);
+ else
+ entry = htable_enter(smtpd_rest_classes, name, (void *) 0);
+ entry->value = (void *) smtpd_check_parse(SMTPD_CHECK_PARSE_ALL, cp);
+}
+
+/* resolve_clnt_init - initialize reply */
+
+void resolve_clnt_init(RESOLVE_REPLY *reply)
+{
+ reply->flags = 0;
+ reply->transport = vstring_alloc(100);
+ reply->nexthop = vstring_alloc(100);
+ reply->recipient = vstring_alloc(100);
+}
+
+void resolve_clnt_free(RESOLVE_REPLY *reply)
+{
+ vstring_free(reply->transport);
+ vstring_free(reply->nexthop);
+ vstring_free(reply->recipient);
+}
+
+bool var_smtpd_sasl_enable = 0;
+
+#ifdef USE_SASL_AUTH
+
+/* smtpd_sasl_activate - stub */
+
+void smtpd_sasl_activate(SMTPD_STATE *state, const char *opts_name,
+ const char *opts_var)
+{
+ msg_panic("smtpd_sasl_activate was called");
+}
+
+/* smtpd_sasl_deactivate - stub */
+
+void smtpd_sasl_deactivate(SMTPD_STATE *state)
+{
+ msg_panic("smtpd_sasl_deactivate was called");
+}
+
+/* permit_sasl_auth - stub */
+
+int permit_sasl_auth(SMTPD_STATE *state, int ifyes, int ifnot)
+{
+ return (ifnot);
+}
+
+/* smtpd_sasl_state_init - the real deal */
+
+void smtpd_sasl_state_init(SMTPD_STATE *state)
+{
+ state->sasl_username = 0;
+ state->sasl_method = 0;
+ state->sasl_sender = 0;
+}
+
+#endif
+
+/* verify_clnt_query - stub */
+
+int verify_clnt_query(const char *addr, int *addr_status, VSTRING *why)
+{
+ *addr_status = DEL_RCPT_STAT_OK;
+ return (VRFY_STAT_OK);
+}
+
+/* rewrite_clnt_internal - stub */
+
+VSTRING *rewrite_clnt_internal(const char *context, const char *addr,
+ VSTRING *result)
+{
+ if (addr == STR(result))
+ msg_panic("rewrite_clnt_internal: result clobbers input");
+ if (*addr && strchr(addr, '@') == 0)
+ msg_fatal("%s: address rewriting is disabled", addr);
+ vstring_strcpy(result, addr);
+ return (result);
+}
+
+/* resolve_clnt_query - stub */
+
+void resolve_clnt(const char *class, const char *unused_sender, const char *addr,
+ RESOLVE_REPLY *reply)
+{
+ const char *domain;
+ int rc;
+
+ if (addr == CONST_STR(reply->recipient))
+ msg_panic("resolve_clnt_query: result clobbers input");
+ if (strchr(addr, '%'))
+ msg_fatal("%s: address rewriting is disabled", addr);
+ if ((domain = strrchr(addr, '@')) == 0)
+ msg_fatal("%s: unqualified address", addr);
+ domain += 1;
+ if ((rc = resolve_local(domain)) > 0) {
+ reply->flags = RESOLVE_CLASS_LOCAL;
+ vstring_strcpy(reply->transport, MAIL_SERVICE_LOCAL);
+ vstring_strcpy(reply->nexthop, domain);
+ } else if (rc < 0) {
+ reply->flags = RESOLVE_FLAG_FAIL;
+ } else if (string_list_match(virt_alias_doms, domain)) {
+ reply->flags = RESOLVE_CLASS_ALIAS;
+ vstring_strcpy(reply->transport, MAIL_SERVICE_ERROR);
+ vstring_strcpy(reply->nexthop, "user unknown");
+ } else if (virt_alias_doms->error) {
+ reply->flags = RESOLVE_FLAG_FAIL;
+ } else if (string_list_match(virt_mailbox_doms, domain)) {
+ reply->flags = RESOLVE_CLASS_VIRTUAL;
+ vstring_strcpy(reply->transport, MAIL_SERVICE_VIRTUAL);
+ vstring_strcpy(reply->nexthop, domain);
+ } else if (virt_mailbox_doms->error) {
+ reply->flags = RESOLVE_FLAG_FAIL;
+ } else if (domain_list_match(relay_domains, domain)) {
+ reply->flags = RESOLVE_CLASS_RELAY;
+ vstring_strcpy(reply->transport, MAIL_SERVICE_RELAY);
+ vstring_strcpy(reply->nexthop, domain);
+ } else if (relay_domains->error) {
+ reply->flags = RESOLVE_FLAG_FAIL;
+ } else {
+ reply->flags = RESOLVE_CLASS_DEFAULT;
+ vstring_strcpy(reply->transport, MAIL_SERVICE_SMTP);
+ vstring_strcpy(reply->nexthop, domain);
+ }
+ vstring_strcpy(reply->recipient, addr);
+}
+
+/* smtpd_chat_reset - stub */
+
+void smtpd_chat_reset(SMTPD_STATE *unused_state)
+{
+}
+
+/* usage - scream and terminate */
+
+static NORETURN usage(char *myname)
+{
+ msg_fatal("usage: %s", myname);
+}
+
+int main(int argc, char **argv)
+{
+ VSTRING *buf = vstring_alloc(100);
+ SMTPD_STATE state;
+ ARGV *args;
+ char *bp;
+ char *resp;
+ char *addr;
+
+ /*
+ * Initialization. Use dummies for client information.
+ */
+ msg_vstream_init(argv[0], VSTREAM_ERR);
+ if (argc != 1)
+ usage(argv[0]);
+ string_init();
+ int_init();
+ smtpd_check_init();
+ smtpd_expand_init();
+ (void) inet_proto_init(argv[0], INET_PROTO_NAME_IPV4);
+ smtpd_state_init(&state, VSTREAM_IN, "smtpd");
+ state.queue_id = "<queue id>";
+
+ /*
+ * Main loop: update config parameters or test the client, helo, sender
+ * and recipient restrictions.
+ */
+ while (vstring_fgets_nonl(buf, VSTREAM_IN) != 0) {
+
+ /*
+ * Tokenize the command. Note, the comma is not a separator, so that
+ * restriction lists can be entered as comma-separated lists.
+ */
+ bp = STR(buf);
+ if (!isatty(0)) {
+ vstream_printf(">>> %s\n", bp);
+ vstream_fflush(VSTREAM_OUT);
+ }
+ if (*bp == '#')
+ continue;
+
+ if (*bp == '!') {
+ vstream_printf("exit %d\n", system(bp + 1));
+ continue;
+ }
+ args = argv_splitq(bp, CHARS_SPACE, CHARS_BRACE);
+
+ /*
+ * Recognize the command.
+ */
+ resp = "bad command";
+ switch (args->argc) {
+
+ /*
+ * Emtpy line.
+ */
+ case 0:
+ argv_free(args);
+ continue;
+
+ /*
+ * Special case: rewrite context.
+ */
+ case 1:
+ if (strcasecmp(args->argv[0], "rewrite") == 0) {
+ resp = smtpd_check_rewrite(&state);
+ break;
+ }
+
+ /*
+ * Other parameter-less commands.
+ */
+ if (strcasecmp(args->argv[0], "flush_dnsxl_cache") == 0) {
+ if (smtpd_rbl_cache) {
+ ctable_free(smtpd_rbl_cache);
+ ctable_free(smtpd_rbl_byte_cache);
+ }
+ smtpd_rbl_cache = ctable_create(100, rbl_pagein,
+ rbl_pageout, (void *) 0);
+ smtpd_rbl_byte_cache = ctable_create(1000, rbl_byte_pagein,
+ rbl_byte_pageout, (void *) 0);
+ resp = 0;
+ break;
+ }
+
+ /*
+ * Special case: client identity.
+ */
+ case 4:
+ case 3:
+ if (strcasecmp(args->argv[0], "client") == 0) {
+ state.where = SMTPD_AFTER_CONNECT;
+ UPDATE_STRING(state.name, args->argv[1]);
+ UPDATE_STRING(state.reverse_name, args->argv[1]);
+ UPDATE_STRING(state.addr, args->argv[2]);
+ if (args->argc == 4)
+ state.name_status =
+ state.reverse_name_status =
+ atoi(args->argv[3]);
+ else if (strcmp(state.name, "unknown") == 0)
+ state.name_status =
+ state.reverse_name_status =
+ SMTPD_PEER_CODE_TEMP;
+ else
+ state.name_status =
+ state.reverse_name_status =
+ SMTPD_PEER_CODE_OK;
+ if (state.namaddr)
+ myfree(state.namaddr);
+ state.namaddr = concatenate(state.name, "[", state.addr,
+ "]", (char *) 0);
+ resp = smtpd_check_client(&state);
+ }
+ break;
+
+ /*
+ * Try config settings.
+ */
+#define UPDATE_MAPS(ptr, var, val, lock) \
+ { if (ptr) maps_free(ptr); ptr = maps_create(var, val, lock); }
+
+#define UPDATE_LIST(ptr, var, val) \
+ { if (ptr) string_list_free(ptr); \
+ ptr = string_list_init(var, MATCH_FLAG_NONE, val); }
+
+ case 2:
+ if (strcasecmp(args->argv[0], VAR_MYDEST) == 0) {
+ UPDATE_STRING(var_mydest, args->argv[1]);
+ resolve_local_init();
+ smtpd_resolve_init(100);
+ resp = 0;
+ break;
+ }
+ if (strcasecmp(args->argv[0], VAR_VIRT_ALIAS_MAPS) == 0) {
+ UPDATE_STRING(var_virt_alias_maps, args->argv[1]);
+ UPDATE_MAPS(virt_alias_maps, VAR_VIRT_ALIAS_MAPS,
+ var_virt_alias_maps, DICT_FLAG_LOCK
+ | DICT_FLAG_FOLD_FIX | DICT_FLAG_UTF8_REQUEST);
+ resp = 0;
+ break;
+ }
+ if (strcasecmp(args->argv[0], VAR_VIRT_ALIAS_DOMS) == 0) {
+ UPDATE_STRING(var_virt_alias_doms, args->argv[1]);
+ UPDATE_LIST(virt_alias_doms, VAR_VIRT_ALIAS_DOMS,
+ var_virt_alias_doms);
+ smtpd_resolve_init(100);
+ resp = 0;
+ break;
+ }
+ if (strcasecmp(args->argv[0], VAR_VIRT_MAILBOX_MAPS) == 0) {
+ UPDATE_STRING(var_virt_mailbox_maps, args->argv[1]);
+ UPDATE_MAPS(virt_mailbox_maps, VAR_VIRT_MAILBOX_MAPS,
+ var_virt_mailbox_maps, DICT_FLAG_LOCK
+ | DICT_FLAG_FOLD_FIX | DICT_FLAG_UTF8_REQUEST);
+ resp = 0;
+ break;
+ }
+ if (strcasecmp(args->argv[0], VAR_VIRT_MAILBOX_DOMS) == 0) {
+ UPDATE_STRING(var_virt_mailbox_doms, args->argv[1]);
+ UPDATE_LIST(virt_mailbox_doms, VAR_VIRT_MAILBOX_DOMS,
+ var_virt_mailbox_doms);
+ smtpd_resolve_init(100);
+ resp = 0;
+ break;
+ }
+ if (strcasecmp(args->argv[0], VAR_LOCAL_RCPT_MAPS) == 0) {
+ UPDATE_STRING(var_local_rcpt_maps, args->argv[1]);
+ UPDATE_MAPS(local_rcpt_maps, VAR_LOCAL_RCPT_MAPS,
+ var_local_rcpt_maps, DICT_FLAG_LOCK
+ | DICT_FLAG_FOLD_FIX | DICT_FLAG_UTF8_REQUEST);
+ resp = 0;
+ break;
+ }
+ if (strcasecmp(args->argv[0], VAR_RELAY_RCPT_MAPS) == 0) {
+ UPDATE_STRING(var_relay_rcpt_maps, args->argv[1]);
+ UPDATE_MAPS(relay_rcpt_maps, VAR_RELAY_RCPT_MAPS,
+ var_relay_rcpt_maps, DICT_FLAG_LOCK
+ | DICT_FLAG_FOLD_FIX | DICT_FLAG_UTF8_REQUEST);
+ resp = 0;
+ break;
+ }
+ if (strcasecmp(args->argv[0], VAR_CANONICAL_MAPS) == 0) {
+ UPDATE_STRING(var_canonical_maps, args->argv[1]);
+ UPDATE_MAPS(canonical_maps, VAR_CANONICAL_MAPS,
+ var_canonical_maps, DICT_FLAG_LOCK
+ | DICT_FLAG_FOLD_FIX | DICT_FLAG_UTF8_REQUEST);
+ resp = 0;
+ break;
+ }
+ if (strcasecmp(args->argv[0], VAR_SEND_CANON_MAPS) == 0) {
+ UPDATE_STRING(var_send_canon_maps, args->argv[1]);
+ UPDATE_MAPS(send_canon_maps, VAR_SEND_CANON_MAPS,
+ var_send_canon_maps, DICT_FLAG_LOCK
+ | DICT_FLAG_FOLD_FIX | DICT_FLAG_UTF8_REQUEST);
+ resp = 0;
+ break;
+ }
+ if (strcasecmp(args->argv[0], VAR_RCPT_CANON_MAPS) == 0) {
+ UPDATE_STRING(var_rcpt_canon_maps, args->argv[1]);
+ UPDATE_MAPS(rcpt_canon_maps, VAR_RCPT_CANON_MAPS,
+ var_rcpt_canon_maps, DICT_FLAG_LOCK
+ | DICT_FLAG_FOLD_FIX | DICT_FLAG_UTF8_REQUEST);
+ resp = 0;
+ break;
+ }
+ if (strcasecmp(args->argv[0], VAR_RBL_REPLY_MAPS) == 0) {
+ UPDATE_STRING(var_rbl_reply_maps, args->argv[1]);
+ UPDATE_MAPS(rbl_reply_maps, VAR_RBL_REPLY_MAPS,
+ var_rbl_reply_maps, DICT_FLAG_LOCK
+ | DICT_FLAG_FOLD_FIX | DICT_FLAG_UTF8_REQUEST);
+ resp = 0;
+ break;
+ }
+ if (strcasecmp(args->argv[0], VAR_MYNETWORKS) == 0) {
+ /* NOT: UPDATE_STRING */
+ namadr_list_free(mynetworks_curr);
+ mynetworks_curr =
+ namadr_list_init(VAR_MYNETWORKS, MATCH_FLAG_RETURN
+ | match_parent_style(VAR_MYNETWORKS),
+ args->argv[1]);
+ smtpd_resolve_init(100);
+ resp = 0;
+ break;
+ }
+ if (strcasecmp(args->argv[0], VAR_RELAY_DOMAINS) == 0) {
+ /* NOT: UPDATE_STRING */
+ domain_list_free(relay_domains);
+ relay_domains =
+ domain_list_init(VAR_RELAY_DOMAINS,
+ match_parent_style(VAR_RELAY_DOMAINS),
+ args->argv[1]);
+ smtpd_resolve_init(100);
+ resp = 0;
+ break;
+ }
+ if (strcasecmp(args->argv[0], VAR_PERM_MX_NETWORKS) == 0) {
+ UPDATE_STRING(var_perm_mx_networks, args->argv[1]);
+ domain_list_free(perm_mx_networks);
+ perm_mx_networks =
+ namadr_list_init(VAR_PERM_MX_NETWORKS, MATCH_FLAG_RETURN
+ | match_parent_style(VAR_PERM_MX_NETWORKS),
+ args->argv[1]);
+ resp = 0;
+ break;
+ }
+ if (strcasecmp(args->argv[0], VAR_SMTPD_DNS_RE_FILTER) == 0) {
+ /* NOT: UPDATE_STRING */
+ dns_rr_filter_compile(VAR_SMTPD_DNS_RE_FILTER, args->argv[1]);
+ resp = 0;
+ break;
+ }
+#ifdef USE_TLS
+ if (strcasecmp(args->argv[0], VAR_RELAY_CCERTS) == 0) {
+ UPDATE_STRING(var_smtpd_relay_ccerts, args->argv[1]);
+ UPDATE_MAPS(relay_ccerts, VAR_RELAY_CCERTS,
+ var_smtpd_relay_ccerts, DICT_FLAG_LOCK
+ | DICT_FLAG_FOLD_FIX);
+ resp = 0;
+ }
+#endif
+ if (strcasecmp(args->argv[0], "restriction_class") == 0) {
+ rest_class(args->argv[1]);
+ resp = 0;
+ break;
+ }
+ if (strcasecmp(args->argv[0], VAR_LOC_RWR_CLIENTS) == 0) {
+ UPDATE_STRING(var_local_rwr_clients, args->argv[1]);
+ argv_free(local_rewrite_clients);
+ local_rewrite_clients = smtpd_check_parse(SMTPD_CHECK_PARSE_MAPS,
+ var_local_rwr_clients);
+ }
+ if (int_update(args->argv)
+ || string_update(args->argv)
+ || rest_update(args->argv)) {
+ resp = 0;
+ break;
+ }
+
+ /*
+ * Try restrictions.
+ */
+#define TRIM_ADDR(src, res) { \
+ if (*(res = src) == '<') { \
+ res += strlen(res) - 1; \
+ if (*res == '>') \
+ *res = 0; \
+ res = src + 1; \
+ } \
+ }
+
+ if (strcasecmp(args->argv[0], "helo") == 0) {
+ state.where = "HELO";
+ resp = smtpd_check_helo(&state, args->argv[1]);
+ UPDATE_STRING(state.helo_name, args->argv[1]);
+ } else if (strcasecmp(args->argv[0], "mail") == 0) {
+ state.where = "MAIL";
+ TRIM_ADDR(args->argv[1], addr);
+ UPDATE_STRING(state.sender, addr);
+ resp = smtpd_check_mail(&state, addr);
+ } else if (strcasecmp(args->argv[0], "rcpt") == 0) {
+ state.where = "RCPT";
+ TRIM_ADDR(args->argv[1], addr);
+ resp = smtpd_check_rcpt(&state, addr);
+#ifdef USE_TLS
+ } else if (strcasecmp(args->argv[0], "fingerprint") == 0) {
+ if (state.tls_context == 0) {
+ state.tls_context =
+ (TLS_SESS_STATE *) mymalloc(sizeof(*state.tls_context));
+ memset((void *) state.tls_context, 0,
+ sizeof(*state.tls_context));
+ state.tls_context->peer_cert_fprint =
+ state.tls_context->peer_pkey_fprint = 0;
+ }
+ state.tls_context->peer_status |= TLS_CERT_FLAG_PRESENT;
+ UPDATE_STRING(state.tls_context->peer_cert_fprint,
+ args->argv[1]);
+ state.tls_context->peer_pkey_fprint =
+ state.tls_context->peer_cert_fprint;
+ resp = "OK";
+ break;
+#endif
+ }
+ break;
+
+ /*
+ * Show commands.
+ */
+ default:
+ if (strcasecmp(args->argv[0], "check_rewrite") == 0) {
+ smtpd_check_rewrite(&state);
+ resp = state.rewrite_context;
+ break;
+ }
+ resp = "Commands...\n\
+ client <name> <address> [<code>]\n\
+ helo <hostname>\n\
+ sender <address>\n\
+ recipient <address>\n\
+ check_rewrite\n\
+ msg_verbose <level>\n\
+ client_restrictions <restrictions>\n\
+ helo_restrictions <restrictions>\n\
+ sender_restrictions <restrictions>\n\
+ recipient_restrictions <restrictions>\n\
+ restriction_class name,<restrictions>\n\
+ flush_dnsxl_cache\n\
+ \n\
+ Note: no address rewriting \n";
+ break;
+ }
+ vstream_printf("%s\n", resp ? resp : "OK");
+ vstream_fflush(VSTREAM_OUT);
+ argv_free(args);
+ }
+ vstring_free(buf);
+ smtpd_state_reset(&state);
+#define FREE_STRING(s) { if (s) myfree(s); }
+ FREE_STRING(state.helo_name);
+ FREE_STRING(state.sender);
+#ifdef USE_TLS
+ if (state.tls_context) {
+ FREE_STRING(state.tls_context->peer_cert_fprint);
+ myfree((void *) state.tls_context);
+ }
+#endif
+ exit(0);
+}
+
+#endif