From: Jeremy Harris Date: Sat, 27 Feb 2021 19:01:07 +0000 (+0000) Subject: Docs: fix description of hosts_try_dane. Bug 2704 X-Git-Tag: exim-4.95-RC0~117 X-Git-Url: https://git.exim.org/exim.git/commitdiff_plain/725900cda2676bad205fb9ff44e563332766479e?hp=47fa38f5d0451322c70a913bbb0707bc1dbcb773 Docs: fix description of hosts_try_dane. Bug 2704 --- diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt index 1c9d17866..2a2f81c72 100644 --- a/doc/doc-docbook/spec.xfpt +++ b/doc/doc-docbook/spec.xfpt @@ -19016,7 +19016,7 @@ transport option of the same name. .cindex "security" "MX lookup" .cindex "DNS" "DNSSEC" DNS lookups for domains matching &%dnssec_request_domains%& will be done with -the dnssec request bit set. +the DNSSEC request bit set. This applies to all of the SRV, MX, AAAA, A lookup sequence. .option dnssec_require_domains routers "domain list&!!" unset @@ -19025,7 +19025,7 @@ This applies to all of the SRV, MX, AAAA, A lookup sequence. .cindex "security" "MX lookup" .cindex "DNS" "DNSSEC" DNS lookups for domains matching &%dnssec_require_domains%& will be done with -the dnssec request bit set. Any returns not having the Authenticated Data bit +the DNSSEC request bit set. Any returns not having the Authenticated Data bit (AD bit) set will be ignored and logged as a host-lookup failure. This applies to all of the SRV, MX, AAAA, A lookup sequence. @@ -25244,7 +25244,7 @@ details. .cindex "security" "MX lookup" .cindex "DNS" "DNSSEC" DNS lookups for domains matching &%dnssec_request_domains%& will be done with -the dnssec request bit set. Setting this transport option is only useful if the +the DNSSEC request bit set. Setting this transport option is only useful if the transport overrides or sets the host names. See the &%dnssec_request_domains%& router option. @@ -25256,7 +25256,7 @@ router option. .cindex "security" "MX lookup" .cindex "DNS" "DNSSEC" DNS lookups for domains matching &%dnssec_require_domains%& will be done with -the dnssec request bit set. Setting this transport option is only +the DNSSEC request bit set. Setting this transport option is only useful if the transport overrides or sets the host names. See the &%dnssec_require_domains%& router option. @@ -25537,9 +25537,9 @@ TLS session for any host that matches this list. .cindex DANE "requiring for certain servers" If built with DANE support, Exim will require that a DNSSEC-validated TLSA record is present for any host matching the list, -and that a DANE-verified TLS connection is made. See -the &%dnssec_request_domains%& router and transport options. +and that a DANE-verified TLS connection is made. There will be no fallback to in-clear communication. +See the &%dnssec_request_domains%& router and transport options. See section &<>&. .option hosts_require_ocsp smtp "host list&!!" unset @@ -25578,11 +25578,14 @@ BDAT will not be used in conjunction with a transport filter. .option hosts_try_dane smtp "host list&!!" * .cindex DANE "transport options" .cindex DANE "attempting for certain servers" -If built with DANE support, Exim will require that a DNSSEC-validated -TLSA record is present for any host matching the list, -and that a DANE-verified TLS connection is made. See -the &%dnssec_request_domains%& router and transport options. -There will be no fallback to in-clear communication. +.new +If built with DANE support, Exim will look up a +TLSA record for any host matching the list, +If one is found and that lookup was DNSSEC-validated, +then Exim requires that a DANE-verified TLS connection is made for that host; +there will be no fallback to in-clear communication. +.wen +See the &%dnssec_request_domains%& router and transport options. See section &<>&. .option hosts_try_fastopen smtp "host list&!!" * @@ -30112,7 +30115,7 @@ the &%dnssec_request_domains%& router or transport option. DANE will only be usable if the target host has DNSSEC-secured MX, A and TLSA records. -A TLSA lookup will be done if either of the above options match and the host-lookup succeeded using dnssec. +A TLSA lookup will be done if either of the above options match and the host-lookup succeeded using DNSSEC. If a TLSA lookup is done and succeeds, a DANE-verified TLS connection will be required for the host. If it does not, the host will not be used; there is no fallback to non-DANE or non-TLS.