X-Git-Url: https://git.distorted.org.uk/~mdw/exim-config/blobdiff_plain/ae9744ce099209f94e7a5b73e47d99af7e712163..534d411b5c96107030e30da491e06734ea09a7b3:/base.m4

diff --git a/base.m4 b/base.m4
index 523e475..204be0a 100644
--- a/base.m4
+++ b/base.m4
@@ -348,9 +348,17 @@ 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
 ## in plaintext anyway.  But all of this can be overridden from the
-## `domains.conf' file.
+## `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.
 smtp:
 	driver = smtp
+	tls_require_ciphers = CONF_acceptable_ciphers
+	tls_dh_min_bits = 1020
+	tls_tempfail_tryclear = true
+
+m4_define(<:SMTP_TRANS_DHBITS:>,
+	<:driver = smtp
 	hosts_try_auth = *
 	hosts_require_tls = DOMKV(tls-peer-ca, {*}{})
 	hosts_require_auth = \
@@ -366,10 +374,12 @@ smtp:
 				 {$value} \
 				 {${expand:$value}}}} \
 		      {CONF_acceptable_ciphers})
-	## Can't set this to an expansion. :-(
-	m4_dnl tls_dh_min_bits = DOMKV(dh-min-bits, {$value}{1020})
-	tls_dh_min_bits = 1020
-	tls_tempfail_tryclear = true
+	tls_dh_min_bits = $1
+	tls_tempfail_tryclear = true:>)m4_dnl
+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.