base.m4: Accept bad synchronization from `submission' clients.

[exim-config] / base.m4

diff --git a/base.m4 b/base.m4
index d64f7a6..32cf73e 100644 (file)
--- a/base.m4
+++ b/base.m4
@@ -105,7 +105,7 @@ SECTION(global, bounce)m4_dnl
 delay_warning = 1h : 24h : 2d
 
 SECTION(global, tls)m4_dnl
-tls_certificate = CONF_sysconf_dir/server.certlist
+tls_certificate = CONF_certlist
 tls_privatekey = CONF_sysconf_dir/server.key
 tls_advertise_hosts = ${if exists {CONF_sysconf_dir/server.key} {*}{}}
 tls_dhparam = CONF_ca_dir/dh-param-2048.pem
@@ -125,6 +125,10 @@ SECTION(global, acl)m4_dnl
 acl_smtp_helo = helo
 SECTION(acl, misc)m4_dnl
 helo:
+       ## Don't worry if this is local submission.  MUAs won't necessarily
+       ## have a clear idea of their hostnames.  (For some reason.)
+       accept   condition = ${if !eq{$acl_c_mode}{submission}}
+
        ## Check that the caller's claimed identity is actually plausible.
        ## This seems like it's a fairly effective filter on spamminess, but
        ## it's too blunt a tool.  Rather than reject, add a warning header.
@@ -239,6 +243,7 @@ check_submission:
 
        ## Remember to apply submission controls.
        warn     set acl_c_mode = submission
+                control = no_enforce_sync
 
        ## Done.
        accept
@@ -287,6 +292,10 @@ SECTION(global, acl)m4_dnl
 acl_smtp_data = data
 SECTION(acl, data)m4_dnl
 data:
+       ## Don't accept messages with overly-long lines.
+       deny     message = line length exceeds SMTP permitted maximum: \
+                       $max_received_linelength > 998
+                condition = ${if >{$max_received_linelength}{998}}
 
 SECTION(acl, data-tail)m4_dnl
        accept
@@ -410,6 +419,11 @@ m4_define(<:APPLY_HEADER_CHANGES:>,
                <:${if def:acl_m_hdrrm{$acl_m_hdrrm:}}\
                $2:>):>)
 
+m4_define(<:SMTP_DELIVERY:>,
+       <:## Prevent sending messages with overly long lines.  The use of
+       ## `message_size_limit' here is somewhat misleading.
+       message_size_limit = ${if >{$max_received_linelength}{998}{1}{0}}:>)
+
 SECTION(transports)m4_dnl
 ## A standard transport for remote delivery.  By default, try to do TLS, and
 ## don't worry too much if it's not very secure: the alternative is sending
@@ -426,6 +440,7 @@ smtp:
 
 m4_define(<:SMTP_TRANS_DHBITS:>,
        <:driver = smtp
+       SMTP_DELIVERY
        APPLY_HEADER_CHANGES
        hosts_try_auth = *
        hosts_require_tls = DOMKV(tls-peer-ca, {*}{})
@@ -457,6 +472,7 @@ smtp_dhbits_2048:
 ## authentication.
 smtp_local:
        driver = smtp
+       SMTP_DELIVERY
        APPLY_HEADER_CHANGES
        hosts_require_tls = *
        tls_certificate = CONF_sysconf_dir/client.certlist