rename the options, document them and reorder the changelog a bit

2 files changed, 28 insertions, 0 deletions

diff --git a/doc/apt.conf.5.xml b/doc/apt.conf.5.xml
index fe005e0f1..0cf4bb663 100644
--- a/doc/apt.conf.5.xml
+++ b/doc/apt.conf.5.xml
@@ -230,6 +230,30 @@ DPkg::Pre-Install-Pkgs {"/usr/sbin/dpkg-preconfigure --apt";};
    and the URI handlers. 
 
    <variablelist>
+     <varlistentry><term>Check-Valid-Until</term>
+	 <listitem><para>Security related option defaulting to true as an
+	 expiring validation for a Release file prevents longtime replay attacks
+	 and can e.g. also help users to identify no longer updated mirrors -
+	 but the feature depends on the correctness of the time on the user system.
+	 Archive maintainers are encouraged to create Release files with the
+	 <literal>Valid-Until</literal> header, but if they don't or a stricter value
+	 is volitional the following <literal>Max-ValidTime</literal> option can be used.
+	 </para></listitem>
+     </varlistentry>
+
+     <varlistentry><term>Max-ValidTime</term>
+	 <listitem><para>Seconds the Release file should be considered valid after
+	 it was created. The default is "for ever" (0) if the Release file of the
+	 archive doesn't include a <literal>Valid-Until</literal> header.
+	 If it does then this date is the default. The date from the Release file or
+	 the date specified by the creation time of the Release file
+	 (<literal>Date</literal> header) plus the seconds specified with this
+	 options are used to check if the validation of a file has expired by using
+	 the earlier date of the two. Archive specific settings can be made by
+	 appending the label of the archive to the option name.
+	 </para></listitem>
+     </varlistentry>
+
      <varlistentry><term>PDiffs</term>
 	 <listitem><para>Try to download deltas called <literal>PDiffs</literal> for
 	 Packages or Sources files instead of downloading whole ones. True
diff --git a/doc/examples/configure-index b/doc/examples/configure-index
index d168417d8..127feb9e9 100644
--- a/doc/examples/configure-index
+++ b/doc/examples/configure-index
@@ -176,6 +176,10 @@ Acquire
   PDiffs::SizeLimit "50"; // don't use diffs if size of all patches excess
 			  // 50% of the size of the original file
 
+  Check-Valid-Until "true";
+  Max-ValidTime "864000"; // 10 days
+  Max-ValidTime::Debian-Security "604800"; // 7 days, label specific configuration
+
   // HTTP method configuration
   http 
   {