Change HELO-verify forward case from byname to bydns and add DNSSEC tracking

[users/jgh/exim.git] / doc / doc-docbook / spec.xfpt

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index 83c2bafec7240ff5d0e7c114ee15ab313f1b8dc9..7527121819d3a74e530fc3aa46511fca415dccce 100644 (file)
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -8965,7 +8965,7 @@ The field selectors marked as "RFC4514" above
 output a Distinguished Name string which is
 not quite
 parseable by Exim as a comma-separated tagged list
-(the exceptions being elements containin commas).
+(the exceptions being elements containing commas).
 RDN elements of a single type may be selected by
 a modifier of the type label; if so the expansion
 result is a list (newline-separated by default).
@@ -11415,7 +11415,7 @@ This variable contains the numerical value of the Exim user id.
 
 .new
 .vitem &$exim_version$&
-.vindex "&$exim_uid$&"
+.vindex "&$exim_version$&"
 This variable contains the version string of the Exim build.
 The first character is a major version number, currently 4.
 Then after a dot, the next group of digits is a minor version number.
@@ -11681,6 +11681,7 @@ the space value is -1. See also the &%check_log_space%& option.
 .vindex "&$lookup_dnssec_authenticated$&"
 This variable is set after a DNS lookup done by
 a dnsdb lookup expansion, dnslookup router or smtp transport.
+.cindex "DNS" "DNSSEC"
 It will be empty if &(DNSSEC)& was not requested,
 &"no"& if the result was not labelled as authenticated data
 and &"yes"& if it was.
@@ -12198,6 +12199,14 @@ verification either failed or was not requested. A host name in parentheses is
 the argument of a HELO or EHLO command. This is omitted if it is identical to
 the verified host name or to the host's IP address in square brackets.
 
+.new
+.vitem &$sender_helo_dnssec$&
+.vindex "&$sender_helo_dnssec$&"
+This boolean variable is true if a successful HELO verification was
+.cindex "DNS" "DNSSEC"
+done using DNS information the resolver library stated was authenticatied data.
+.wen
+
 .vitem &$sender_helo_name$&
 .vindex "&$sender_helo_name$&"
 When a message is received from a remote host that has issued a HELO or EHLO
@@ -12223,9 +12232,11 @@ received. It is empty if there was no successful authentication. See also
 If an attempt to populate &$sender_host_name$& has been made
 (by reference, &%hosts_lookup%& or
 otherwise) then this boolean will have been set true if, and only if, the
-resolver library states that the reverse DNS was authenticated data.  At all
+resolver library states that both
+the reverse and forward DNS were authenticated data.  At all
 other times, this variable is false.
 
+.cindex "DNS" "DNSSEC"
 It is likely that you will need to coerce DNSSEC support on in the resolver
 library, by setting:
 .code
@@ -12235,9 +12246,6 @@ dns_dnssec_ok = 1
 Exim does not perform DNSSEC validation itself, instead leaving that to a
 validating resolver (eg, unbound, or bind with suitable configuration).
 
-Exim does not (currently) check to see if the forward DNS was also secured
-with DNSSEC, only the reverse DNS.
-
 If you have changed &%host_lookup_order%& so that &`bydns`& is not the first
 mechanism in the list, then this variable will be false.
 
@@ -14537,14 +14545,17 @@ is an IP literal matching the calling address of the host, or
 matches the host name that Exim obtains by doing a reverse lookup of the
 calling host address, or
 .next
-when looked up using &[gethostbyname()]& (or &[getipnodebyname()]& when
-available) yields the calling host address.
+when looked up in DNS yields the calling host address.
 .endlist
 
 However, the EHLO or HELO command is not rejected if any of the checks
 fail. Processing continues, but the result of the check is remembered, and can
 be detected later in an ACL by the &`verify = helo`& condition.
 
+If DNS was used for successful verification, the variable
+.cindex "DNS" "DNSSEC"
+&$helo_verify_dnssec$& records the DNSSEC status of the lookups.
+
 .option helo_verify_hosts main "host list&!!" unset
 .cindex "HELO verifying" "mandatory"
 .cindex "EHLO" "verifying, mandatory"