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| 1 | <?php declare( strict_types=1 ); |
| 2 | |
| 3 | namespace SecurityCheckPlugin; |
| 4 | |
| 5 | use ast\Node; |
| 6 | |
| 7 | /** |
| 8 | * Tree-like object of possible offset combinations for partial links to a parameter |
| 9 | */ |
| 10 | class ParamLinksOffsets { |
| 11 | /** @var int What taint flags are preserved for this offset */ |
| 12 | private $ownFlags; |
| 13 | |
| 14 | /** @var self[] */ |
| 15 | private $dims = []; |
| 16 | |
| 17 | /** @var self|null */ |
| 18 | private $unknown; |
| 19 | |
| 20 | /** @var int */ |
| 21 | private $keysFlags = SecurityCheckPlugin::NO_TAINT; |
| 22 | |
| 23 | /** |
| 24 | * @param int $flags |
| 25 | */ |
| 26 | public function __construct( int $flags ) { |
| 27 | $this->ownFlags = $flags; |
| 28 | } |
| 29 | |
| 30 | public static function getInstance( int $flags ): self { |
| 31 | static $singletons = []; |
| 32 | if ( !isset( $singletons[$flags] ) ) { |
| 33 | $singletons[$flags] = new self( $flags ); |
| 34 | } |
| 35 | return $singletons[$flags]; |
| 36 | } |
| 37 | |
| 38 | public function asMergedWith( self $other ): self { |
| 39 | if ( $this === $other ) { |
| 40 | return $this; |
| 41 | } |
| 42 | |
| 43 | $ret = clone $this; |
| 44 | |
| 45 | $ret->ownFlags |= $other->ownFlags; |
| 46 | if ( $other->unknown && !$ret->unknown ) { |
| 47 | $ret->unknown = $other->unknown; |
| 48 | } elseif ( $other->unknown ) { |
| 49 | $ret->unknown = $ret->unknown->asMergedWith( $other->unknown ); |
| 50 | } |
| 51 | foreach ( $other->dims as $key => $val ) { |
| 52 | if ( !isset( $ret->dims[$key] ) ) { |
| 53 | $ret->dims[$key] = $val; |
| 54 | } else { |
| 55 | $ret->dims[$key] = $ret->dims[$key]->asMergedWith( $val ); |
| 56 | } |
| 57 | } |
| 58 | $ret->keysFlags |= $other->keysFlags; |
| 59 | |
| 60 | return $ret; |
| 61 | } |
| 62 | |
| 63 | public function withoutShape( self $other ): self { |
| 64 | $ret = clone $this; |
| 65 | |
| 66 | $ret->ownFlags &= ~$other->ownFlags; |
| 67 | foreach ( $other->dims as $key => $val ) { |
| 68 | if ( isset( $ret->dims[$key] ) ) { |
| 69 | $ret->dims[$key] = $ret->dims[$key]->withoutShape( $val ); |
| 70 | } |
| 71 | } |
| 72 | if ( $other->unknown && $ret->unknown ) { |
| 73 | $ret->unknown = $ret->unknown->withoutShape( $other->unknown ); |
| 74 | } |
| 75 | $ret->keysFlags &= ~$other->keysFlags; |
| 76 | return $ret; |
| 77 | } |
| 78 | |
| 79 | /** |
| 80 | * Pushes $offsets to all leaves. |
| 81 | * @param Node|string|int|null $offset |
| 82 | */ |
| 83 | public function withOffsetPushed( $offset ): self { |
| 84 | $ret = clone $this; |
| 85 | |
| 86 | foreach ( $ret->dims as $key => $val ) { |
| 87 | $ret->dims[$key] = $val->withOffsetPushed( $offset ); |
| 88 | } |
| 89 | if ( $ret->unknown ) { |
| 90 | $ret->unknown = $ret->unknown->withOffsetPushed( $offset ); |
| 91 | } |
| 92 | |
| 93 | if ( $ret->ownFlags === SecurityCheckPlugin::NO_TAINT ) { |
| 94 | return $ret; |
| 95 | } |
| 96 | |
| 97 | $ownFlags = $ret->ownFlags; |
| 98 | $ret->ownFlags = SecurityCheckPlugin::NO_TAINT; |
| 99 | if ( is_scalar( $offset ) && !isset( $ret->dims[$offset] ) ) { |
| 100 | $ret->dims[$offset] = self::getInstance( $ownFlags ); |
| 101 | } elseif ( !is_scalar( $offset ) && !$ret->unknown ) { |
| 102 | $ret->unknown = self::getInstance( $ownFlags ); |
| 103 | } |
| 104 | |
| 105 | return $ret; |
| 106 | } |
| 107 | |
| 108 | /** |
| 109 | * @return self |
| 110 | */ |
| 111 | public function asMovedToKeys(): self { |
| 112 | $ret = new self( SecurityCheckPlugin::NO_TAINT ); |
| 113 | |
| 114 | foreach ( $this->dims as $k => $val ) { |
| 115 | $ret->dims[$k] = $val->asMovedToKeys(); |
| 116 | } |
| 117 | if ( $this->unknown ) { |
| 118 | $ret->unknown = $this->unknown->asMovedToKeys(); |
| 119 | } |
| 120 | |
| 121 | $ret->keysFlags = $this->ownFlags; |
| 122 | |
| 123 | return $ret; |
| 124 | } |
| 125 | |
| 126 | /** |
| 127 | * @param Taintedness $taintedness |
| 128 | * @return Taintedness |
| 129 | */ |
| 130 | public function appliedToTaintedness( Taintedness $taintedness ): Taintedness { |
| 131 | if ( $this->ownFlags ) { |
| 132 | $ret = $taintedness->withOnly( $this->ownFlags ); |
| 133 | } else { |
| 134 | $ret = Taintedness::safeSingleton(); |
| 135 | } |
| 136 | foreach ( $this->dims as $k => $val ) { |
| 137 | $ret = $ret->asMergedWith( |
| 138 | $val->appliedToTaintedness( $taintedness->getTaintednessForOffsetOrWhole( $k ) ) |
| 139 | ); |
| 140 | } |
| 141 | if ( $this->unknown ) { |
| 142 | $ret = $ret->asMergedWith( |
| 143 | $this->unknown->appliedToTaintedness( $taintedness->getTaintednessForOffsetOrWhole( null ) ) |
| 144 | ); |
| 145 | } |
| 146 | $ret = $ret->with( $taintedness->asKeyForForeach()->withOnly( $this->keysFlags )->get() ); |
| 147 | return $ret; |
| 148 | } |
| 149 | |
| 150 | public function appliedToTaintednessForBackprop( Taintedness $taintedness ): Taintedness { |
| 151 | if ( $this->ownFlags ) { |
| 152 | $ret = $taintedness->withOnly( $this->ownFlags ); |
| 153 | } else { |
| 154 | $ret = Taintedness::safeSingleton(); |
| 155 | } |
| 156 | |
| 157 | foreach ( $this->dims as $k => $val ) { |
| 158 | $ret = $ret->withAddedOffsetTaintedness( |
| 159 | $k, |
| 160 | $val->appliedToTaintednessForBackprop( $taintedness->getTaintednessForOffsetOrWhole( $k ) ) |
| 161 | ); |
| 162 | } |