2019-08-04 16:37:36 +02:00
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<?php
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namespace Psalm\Internal\Codebase;
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use Psalm\CodeLocation;
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use Psalm\Internal\Analyzer\StatementsAnalyzer;
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2019-10-13 18:34:40 +02:00
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use Psalm\Internal\Provider\ClassLikeStorageProvider;
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use Psalm\Internal\Provider\FileReferenceProvider;
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use Psalm\Internal\Provider\FileStorageProvider;
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2020-05-22 04:47:58 +02:00
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use Psalm\Internal\Taint\Path;
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2019-08-14 06:47:57 +02:00
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use Psalm\Internal\Taint\Sink;
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use Psalm\Internal\Taint\Source;
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2020-05-22 04:47:58 +02:00
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use Psalm\Internal\Taint\TaintNode;
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2019-08-14 06:47:57 +02:00
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use Psalm\Internal\Taint\Taintable;
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2019-08-04 16:37:36 +02:00
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use Psalm\IssueBuffer;
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use Psalm\Issue\TaintedInput;
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use function array_merge;
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use function array_merge_recursive;
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use function strtolower;
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use UnexpectedValueException;
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2020-05-22 04:47:58 +02:00
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use function count;
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use function implode;
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use function substr;
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use function strlen;
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use function array_intersect;
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2019-08-04 16:37:36 +02:00
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class Taint
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{
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2020-05-22 04:47:58 +02:00
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/** @var array<string, Source> */
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private $sources = [];
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2019-08-04 16:37:36 +02:00
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2020-05-22 04:47:58 +02:00
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/** @var array<string, TaintNode> */
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private $nodes = [];
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2019-08-04 16:37:36 +02:00
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2020-05-22 04:47:58 +02:00
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/** @var array<string, Sink> */
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private $sinks = [];
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2019-08-04 16:37:36 +02:00
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2020-05-22 04:47:58 +02:00
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/** @var array<string, array<string, array{array<string>, array<string>}>> */
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private $forward_edges = [];
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2019-08-04 16:37:36 +02:00
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2020-05-22 04:47:58 +02:00
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/** @var array<string, array<string, true>> */
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2020-05-22 05:43:13 +02:00
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private $specialized_calls = [];
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2019-08-06 20:27:21 +02:00
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2020-05-22 04:47:58 +02:00
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public function addSource(Source $node) : void
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2019-08-04 16:37:36 +02:00
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{
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$this->sources[$node->id] = $node;
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2019-08-04 16:37:36 +02:00
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}
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2020-05-22 04:47:58 +02:00
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public function addSink(Sink $node) : void
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2019-08-04 16:37:36 +02:00
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{
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2020-05-22 05:43:13 +02:00
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$this->sinks[$node->id] = $node;
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2020-05-23 05:53:37 +02:00
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// in the rare case the sink is the _next_ node, this is necessary
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$this->nodes[$node->id] = $node;
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2019-08-04 16:37:36 +02:00
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}
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2020-05-22 04:47:58 +02:00
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public function addTaintNode(TaintNode $node) : void
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2019-08-04 16:37:36 +02:00
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{
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2020-05-22 05:43:13 +02:00
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$this->nodes[$node->id] = $node;
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2019-08-04 16:37:36 +02:00
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2020-05-22 04:47:58 +02:00
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if ($node->unspecialized_id && $node->specialization_key) {
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2020-05-22 05:43:13 +02:00
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$this->specialized_calls[$node->specialization_key][$node->unspecialized_id] = true;
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2019-08-14 06:47:57 +02:00
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}
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}
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/**
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2020-05-22 04:47:58 +02:00
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* @param array<string> $added_taints
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* @param array<string> $removed_taints
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2019-08-14 06:47:57 +02:00
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*/
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public function addPath(
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Taintable $from,
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Taintable $to,
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array $added_taints = [],
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array $removed_taints = []
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) : void {
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$from_id = $from->id;
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$to_id = $to->id;
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2019-08-14 06:47:57 +02:00
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2020-05-22 05:43:13 +02:00
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$this->forward_edges[$from_id][$to_id] = [$added_taints, $removed_taints];
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2019-08-04 16:37:36 +02:00
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}
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2020-05-22 04:47:58 +02:00
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public function getPredecessorPath(Taintable $source) : string
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2019-08-04 16:37:36 +02:00
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{
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2019-08-07 00:56:36 +02:00
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$location_summary = '';
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2019-08-06 23:29:44 +02:00
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2019-08-07 00:56:36 +02:00
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if ($source->code_location) {
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2019-10-19 23:59:10 +02:00
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$location_summary = $source->code_location->getShortSummary();
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2019-08-14 15:52:59 +02:00
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}
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2019-08-06 23:29:44 +02:00
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2019-10-19 23:59:10 +02:00
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$source_descriptor = $source->label . ($location_summary ? ' (' . $location_summary . ')' : '');
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2019-08-04 16:37:36 +02:00
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2020-05-22 04:47:58 +02:00
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$previous_source = $source->previous;
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2019-08-14 06:47:57 +02:00
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if ($previous_source) {
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2019-08-04 16:37:36 +02:00
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if ($previous_source === $source) {
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2019-08-07 00:56:36 +02:00
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return '';
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2019-08-04 16:37:36 +02:00
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}
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2020-05-22 04:47:58 +02:00
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return $this->getPredecessorPath($previous_source) . ' -> ' . $source_descriptor;
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2019-08-04 16:37:36 +02:00
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}
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return $source_descriptor;
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}
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2020-05-22 04:47:58 +02:00
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public function getSuccessorPath(Taintable $sink) : string
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2019-08-04 16:37:36 +02:00
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{
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2019-08-07 00:56:36 +02:00
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$location_summary = '';
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2019-08-06 23:29:44 +02:00
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2019-08-14 06:47:57 +02:00
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if ($sink->code_location) {
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2019-10-19 23:59:10 +02:00
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$location_summary = $sink->code_location->getShortSummary();
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2019-08-14 15:52:59 +02:00
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}
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2019-08-06 23:29:44 +02:00
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2019-10-19 23:59:10 +02:00
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$sink_descriptor = $sink->label . ($location_summary ? ' (' . $location_summary . ')' : '');
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2019-08-04 16:37:36 +02:00
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2020-05-22 04:47:58 +02:00
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$next_sink = $sink->previous;
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2019-08-14 06:47:57 +02:00
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if ($next_sink) {
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if ($next_sink === $sink) {
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2019-08-07 00:56:36 +02:00
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return '';
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}
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2020-05-22 04:47:58 +02:00
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return $sink_descriptor . ' -> ' . $this->getSuccessorPath($next_sink);
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2019-08-04 16:37:36 +02:00
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}
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2019-08-14 06:47:57 +02:00
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return $sink_descriptor;
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2019-08-04 16:37:36 +02:00
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}
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2020-05-22 04:47:58 +02:00
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public function addThreadData(self $taint) : void
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2019-08-04 16:37:36 +02:00
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{
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2020-05-22 04:47:58 +02:00
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$this->sources += $taint->sources;
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$this->sinks += $taint->sinks;
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$this->nodes += $taint->nodes;
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$this->specialized_calls += $taint->specialized_calls;
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foreach ($taint->forward_edges as $key => $map) {
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if (!isset($this->forward_edges[$key])) {
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$this->forward_edges[$key] = $map;
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} else {
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2020-05-22 18:33:04 +02:00
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$this->forward_edges[$key] += $map;
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2019-10-14 02:10:31 +02:00
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}
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}
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2020-05-22 04:47:58 +02:00
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}
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public function connectSinksAndSources() : void
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{
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$visited_source_ids = [];
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2020-05-22 05:43:13 +02:00
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$sources = $this->sources;
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$sinks = $this->sinks;
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2020-05-22 04:47:58 +02:00
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2020-05-22 18:33:04 +02:00
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for ($i = 0; count($sinks) && count($sources) && $i < 20; $i++) {
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2020-05-22 04:47:58 +02:00
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$new_sources = [];
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foreach ($sources as $source) {
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$source_taints = $source->taints;
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\sort($source_taints);
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$visited_source_ids[$source->id][implode(',', $source_taints)] = true;
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2020-05-22 05:43:13 +02:00
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if (!isset($this->forward_edges[$source->id])) {
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2020-05-22 04:47:58 +02:00
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$source = clone $source;
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2019-10-14 02:10:31 +02:00
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2020-05-22 05:43:13 +02:00
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if ($source->specialization_key && isset($this->specialized_calls[$source->specialization_key])) {
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2020-05-22 04:47:58 +02:00
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$source->specialized_calls[$source->specialization_key]
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2020-05-22 05:43:13 +02:00
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= $this->specialized_calls[$source->specialization_key];
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2019-10-14 02:10:31 +02:00
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2020-05-22 04:47:58 +02:00
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$source->id = substr($source->id, 0, -strlen($source->specialization_key) - 1);
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} else {
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foreach ($source->specialized_calls as $key => $map) {
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2020-05-22 05:43:13 +02:00
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if (isset($map[$source->id]) && isset($this->forward_edges[$source->id . '-' . $key])) {
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2020-05-22 04:47:58 +02:00
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$source->id = $source->id . '-' . $key;
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}
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}
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2019-10-14 02:10:31 +02:00
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}
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2020-05-22 05:43:13 +02:00
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if (!isset($this->forward_edges[$source->id])) {
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2020-05-22 04:47:58 +02:00
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continue;
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}
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2019-10-14 02:10:31 +02:00
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}
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2020-05-22 05:43:13 +02:00
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foreach ($this->forward_edges[$source->id] as $to_id => [$added_taints, $removed_taints]) {
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if (!isset($this->nodes[$to_id])) {
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2020-05-22 04:47:58 +02:00
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continue;
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}
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2019-10-14 02:10:31 +02:00
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2020-05-22 04:47:58 +02:00
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$new_taints = \array_unique(
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\array_diff(
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\array_merge($source_taints, $added_taints),
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$removed_taints
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)
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);
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2019-10-13 18:34:40 +02:00
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2020-05-22 04:47:58 +02:00
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\sort($new_taints);
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2019-08-04 16:37:36 +02:00
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2020-05-22 05:43:13 +02:00
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$destination_node = $this->nodes[$to_id];
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2019-08-04 16:37:36 +02:00
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2020-05-22 04:47:58 +02:00
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if (isset($visited_source_ids[$to_id][implode(',', $new_taints)])) {
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continue;
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}
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2019-10-14 04:05:16 +02:00
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2020-05-22 04:47:58 +02:00
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if (isset($sinks[$to_id])) {
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$matching_taints = array_intersect($sinks[$to_id]->taints, $new_taints);
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if ($matching_taints && $source->code_location) {
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if (IssueBuffer::accepts(
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new TaintedInput(
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'Detected tainted ' . implode(', ', $matching_taints)
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. ' in path: ' . $this->getPredecessorPath($source)
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. ' -> ' . $this->getSuccessorPath($sinks[$to_id]),
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2020-05-22 05:43:13 +02:00
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$sinks[$to_id]->code_location ?: $source->code_location
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2020-05-22 04:47:58 +02:00
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)
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)) {
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// fall through
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}
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continue;
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}
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}
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2019-10-14 04:05:16 +02:00
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2020-05-22 04:47:58 +02:00
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$new_destination = clone $destination_node;
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$new_destination->previous = $source;
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$new_destination->taints = $new_taints;
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$new_destination->specialized_calls = $source->specialized_calls;
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2019-10-14 04:05:16 +02:00
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2020-05-22 04:47:58 +02:00
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$new_sources[$to_id] = $new_destination;
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}
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2019-10-14 04:05:16 +02:00
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}
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2019-10-13 18:34:40 +02:00
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2020-05-22 04:47:58 +02:00
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$sources = $new_sources;
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}
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2019-08-04 16:37:36 +02:00
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}
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}
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