base.m4, vhost.m4: Very hacky DH field-size limitation.

[exim-config] / base.m4

diff --git a/base.m4 b/base.m4
index 90fcca6..4a925df 100644 (file)
--- a/base.m4
+++ b/base.m4
@@ -88,6 +88,18 @@ qualify_domain = CONF_master_domain
 SECTION(global, bounce)m4_dnl
 delay_warning = 1h : 24h : 2d
 
+SECTION(global, tls)m4_dnl
+tls_certificate = CONF_sysconf_dir/server.cert
+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
+tls_require_ciphers = ${if or {{={$received_port}{CONF_submission_port}} \
+                              {match_ip {$sender_host_address}{+trusted}}} \
+                          {CONF_good_ciphers} \
+                          {CONF_acceptable_ciphers}}
+tls_verify_certificates = CONF_ca_dir/ca.cert
+tls_verify_hosts = ${if eq{$acl_c_mode}{submission} {} {+allnets}}
+
 DIVERT(null)
 ###--------------------------------------------------------------------------
 ### Access control lists.
@@ -333,14 +345,37 @@ m4_define(<:USER_DELIVERY:>,
        return_path_add = true:>)
 
 SECTION(transports)m4_dnl
-## A standard transport for remote delivery.  Try to do TLS, and don't worry
-## too much if it's not very secure: the alternative is sending in plaintext
-## anyway.
+## 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
+## in plaintext anyway.  But all of this can be overridden from the
+## `domains.conf' file.  Annoyingly, the `tls_dh_min_bits' setting isn't
+## expanded before use, so we can't set it the obvious way.  Instead, encode
+## it into the transport name.  This is very unpleasant, of course.
+m4_define(<:SMTP_TRANS_DHBITS:>,
+       <:driver = smtp
+       hosts_try_auth = *
+       hosts_require_tls = DOMKV(tls-peer-ca, {*}{})
+       hosts_require_auth = \
+               ${if bool {DOMKV(require-auth, {$value}{false})} {*}{}}
+       tls_certificate = DOMKV(tls-certificate, {${expand:$value}}fail)
+       tls_privatekey = DOMKV(tls-private-key, {${expand:$value}}fail)
+       tls_verify_certificates = DOMKV(tls-peer-ca, {${expand:$value}}fail)
+       tls_require_ciphers = \
+               DOMKV(tls-ciphers,
+                     {${extract {${expand:$value}} \
+                                { good = CONF_good_ciphers \
+                                  any = CONF_acceptable_ciphers } \
+                                {$value} \
+                                {${expand:$value}}}} \
+                     {CONF_acceptable_ciphers})
+       tls_dh_min_bits = $1
+       tls_tempfail_tryclear = true:>)m4_dnl
 smtp:
-       driver = smtp
-       tls_require_ciphers = CONF_acceptable_ciphers
-       tls_dh_min_bits = 1020
-       tls_tempfail_tryclear = true
+       SMTP_TRANS_DHBITS(1020)
+smtp_dhbits_1024:
+       SMTP_TRANS_DHBITS(1020)
+smtp_dhbits_2048:
+       SMTP_TRANS_DHBITS(2046)
 
 ## Transport to a local SMTP server; use TLS and perform client
 ## authentication.