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[stable23] fix potential unwarranted memberships in nested groups from LDAP #30343

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merged 1 commit into from Dec 30, 2021
Merged

[stable23] fix potential unwarranted memberships in nested groups from LDAP #30343

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16 changes: 14 additions & 2 deletions apps/user_ldap/lib/Group_LDAP.php
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Expand Up @@ -248,7 +248,12 @@ private function _groupMembers(string $dnGroup, ?array &$seen = null): array {
// but not included in the results laters on
$excludeFromResult = $dnGroup;
}
// cache only base groups, otherwise groups get additional unwarranted members
$shouldCacheResult = count($seen) === 0;

static $rawMemberReads = []; // runtime cache for intermediate ldap read results
$allMembers = [];

if (array_key_exists($dnGroup, $seen)) {
return [];
}
Expand Down Expand Up @@ -290,7 +295,11 @@ private function _groupMembers(string $dnGroup, ?array &$seen = null): array {
}

$seen[$dnGroup] = 1;
$members = $this->access->readAttribute($dnGroup, $this->access->connection->ldapGroupMemberAssocAttr);
$members = $rawMemberReads[$dnGroup] ?? null;
if ($members === null) {
$members = $this->access->readAttribute($dnGroup, $this->access->connection->ldapGroupMemberAssocAttr);
$rawMemberReads[$dnGroup] = $members;
}
if (is_array($members)) {
$fetcher = function ($memberDN) use (&$seen) {
return $this->_groupMembers($memberDN, $seen);
Expand All @@ -306,7 +315,10 @@ private function _groupMembers(string $dnGroup, ?array &$seen = null): array {
}
}

$this->access->connection->writeToCache($cacheKey, $allMembers);
if ($shouldCacheResult) {
$this->access->connection->writeToCache($cacheKey, $allMembers);
unset($rawMemberReads[$dnGroup]);
}
if (isset($attemptedLdapMatchingRuleInChain)
&& $this->access->connection->ldapMatchingRuleInChainState === Configuration::LDAP_SERVER_FEATURE_UNKNOWN
&& !empty($allMembers)
Expand Down