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D10136.id24375.diff
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diff --git a/src/applications/auth/engine/PhabricatorAuthSessionEngine.php b/src/applications/auth/engine/PhabricatorAuthSessionEngine.php
--- a/src/applications/auth/engine/PhabricatorAuthSessionEngine.php
+++ b/src/applications/auth/engine/PhabricatorAuthSessionEngine.php
@@ -165,6 +165,9 @@
// TTL back up to the full duration. The idea here is that sessions are
// good forever if used regularly, but get GC'd when they fall out of use.
+ // NOTE: If we begin rotating session keys when extending sessions, the
+ // CSRF code needs to be updated so CSRF tokens survive session rotation.
+
if (time() + (0.80 * $ttl) > $session->getSessionExpires()) {
$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
$conn_w = $session_table->establishConnection('w');
diff --git a/src/applications/people/storage/PhabricatorUser.php b/src/applications/people/storage/PhabricatorUser.php
--- a/src/applications/people/storage/PhabricatorUser.php
+++ b/src/applications/people/storage/PhabricatorUser.php
@@ -339,6 +339,10 @@
$vec = $this->getAlternateCSRFString();
}
+ if ($this->hasSession()) {
+ $vec = $vec.$this->getSession()->getSessionKey();
+ }
+
$time_block = floor($epoch / $frequency);
$vec = $vec.$key.$time_block;
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D10136: Make the current session key a component of the CSRF token
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