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| 1 | <?php declare( strict_types=1 ); |
| 2 | |
| 3 | namespace SecurityCheckPlugin; |
| 4 | |
| 5 | use ast\Node; |
| 6 | use Phan\Language\Element\FunctionInterface; |
| 7 | |
| 8 | /** |
| 9 | * Value object that represents method links. |
| 10 | * @todo We might store links inside Taintedness, but the memory usage might skyrocket |
| 11 | */ |
| 12 | class MethodLinks { |
| 13 | /** @var LinksSet */ |
| 14 | private $links; |
| 15 | |
| 16 | /** @var self[] */ |
| 17 | private $dimLinks = []; |
| 18 | |
| 19 | /** @var self|null */ |
| 20 | private $unknownDimLinks; |
| 21 | |
| 22 | /** @var LinksSet|null */ |
| 23 | private $keysLinks; |
| 24 | |
| 25 | /** |
| 26 | * @param LinksSet|null $links |
| 27 | */ |
| 28 | public function __construct( LinksSet $links = null ) { |
| 29 | $this->links = $links ?? new LinksSet(); |
| 30 | } |
| 31 | |
| 32 | /** |
| 33 | * @return self |
| 34 | */ |
| 35 | public static function newEmpty(): self { |
| 36 | return new self( new LinksSet ); |
| 37 | } |
| 38 | |
| 39 | /** |
| 40 | * @note This returns a clone |
| 41 | * @param mixed $dim |
| 42 | * @return self |
| 43 | */ |
| 44 | public function getForDim( $dim ): self { |
| 45 | if ( !is_scalar( $dim ) ) { |
| 46 | return $this->asValueFirstLevel()->withAddedOffset( $dim ); |
| 47 | } |
| 48 | if ( isset( $this->dimLinks[$dim] ) ) { |
| 49 | $ret = clone $this->dimLinks[$dim]; |
| 50 | $ret->mergeWith( $this->unknownDimLinks ?? self::newEmpty() ); |
| 51 | $ret->links->mergeWith( $this->links ); |
| 52 | return $ret->withAddedOffset( $dim ); |
| 53 | } |
| 54 | $ret = $this->unknownDimLinks ? clone $this->unknownDimLinks : self::newEmpty(); |
| 55 | $ret->links->mergeWith( $this->links ); |
| 56 | return $ret->withAddedOffset( $dim ); |
| 57 | } |
| 58 | |
| 59 | /** |
| 60 | * @return self |
| 61 | */ |
| 62 | public function asValueFirstLevel(): self { |
| 63 | $ret = new self( clone $this->links ); |
| 64 | $ret->mergeWith( $this->unknownDimLinks ?? self::newEmpty() ); |
| 65 | foreach ( $this->dimLinks as $links ) { |
| 66 | $ret->mergeWith( $links ); |
| 67 | } |
| 68 | return $ret; |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * @return self |
| 73 | */ |
| 74 | public function asKeyForForeach(): self { |
| 75 | if ( $this->keysLinks ) { |
| 76 | $links = $this->keysLinks->asMergedWith( $this->links ); |
| 77 | } else { |
| 78 | $links = $this->links; |
| 79 | } |
| 80 | return new self( $links->asAllMovedToKeys() ); |
| 81 | } |
| 82 | |
| 83 | /** |
| 84 | * @param mixed $dim |
| 85 | * @param MethodLinks $links |
| 86 | */ |
| 87 | public function setAtDim( $dim, self $links ): void { |
| 88 | if ( is_scalar( $dim ) ) { |
| 89 | $this->dimLinks[$dim] = $links; |
| 90 | } else { |
| 91 | $this->unknownDimLinks ??= self::newEmpty(); |
| 92 | $this->unknownDimLinks->mergeWith( $links ); |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | /** |
| 97 | * @param LinksSet $links |
| 98 | */ |
| 99 | public function addKeysLinks( LinksSet $links ): void { |
| 100 | if ( !$this->keysLinks ) { |
| 101 | $this->keysLinks = $links; |
| 102 | } else { |
| 103 | $this->keysLinks->mergeWith( $links ); |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | /** |
| 108 | * @return self |
| 109 | */ |
| 110 | public function asCollapsed(): self { |
| 111 | $ret = new self( $this->links ); |
| 112 | foreach ( $this->dimLinks as $links ) { |
| 113 | $ret->mergeWith( $links->asCollapsed() ); |
| 114 | } |
| 115 | if ( $this->unknownDimLinks ) { |
| 116 | $ret->mergeWith( $this->unknownDimLinks->asCollapsed() ); |
| 117 | } |
| 118 | return $ret; |
| 119 | } |
| 120 | |
| 121 | /** |
| 122 | * Merge this object with $other, recursively and without creating a copy. |
| 123 | * |
| 124 | * @param self $other |
| 125 | */ |
| 126 | public function mergeWith( self $other ): void { |
| 127 | $this->links->mergeWith( $other->links ); |
| 128 | foreach ( $other->dimLinks as $key => $links ) { |
| 129 | if ( isset( $this->dimLinks[$key] ) ) { |
| 130 | $this->dimLinks[$key]->mergeWith( $links ); |
| 131 | } else { |
| 132 | $this->dimLinks[$key] = $links; |
| 133 | } |
| 134 | } |
| 135 | if ( $other->unknownDimLinks && !$this->unknownDimLinks ) { |
| 136 | $this->unknownDimLinks = $other->unknownDimLinks; |
| 137 | } elseif ( $other->unknownDimLinks ) { |
| 138 | $this->unknownDimLinks->mergeWith( $other->unknownDimLinks ); |
| 139 | } |
| 140 | if ( $other->keysLinks && !$this->keysLinks ) { |
| 141 | $this->keysLinks = $other->keysLinks; |
| 142 | } elseif ( $other->keysLinks ) { |
| 143 | $this->keysLinks->mergeWith( $other->keysLinks ); |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | /** |
| 148 | * Merge this object with $other, recursively, creating a copy. |
| 149 | * |
| 150 | * @param self $other |
| 151 | * @return self |
| 152 | */ |
| 153 | public function asMergedWith( self $other ): self { |
| 154 | $ret = clone $this; |
| 155 | $ret->mergeWith( $other ); |
| 156 | return $ret; |
| 157 | } |
| 158 | |
| 159 | /** |
| 160 | * @param Node|mixed $offset |
| 161 | * @return self |
| 162 | */ |
| 163 | public function withAddedOffset( $offset ): self { |
| 164 | $ret = clone $this; |
| 165 | foreach ( $ret->links as $func ) { |
| 166 | $ret->links[$func]->pushOffsetToAll( $offset ); |
| 167 | } |
| 168 | return $ret; |
| 169 | } |
| 170 | |
| 171 | /** |
| 172 | * Create a new object with $this at the given $offset (if scalar) or as unknown object. |
| 173 | * |
| 174 | * @param Node|string|int|bool|float|null $offset |
| 175 | * @param LinksSet|null $keyLinks |
| 176 | * @return self Always a copy |
| 177 | */ |
| 178 | public function asMaybeMovedAtOffset( $offset, LinksSet $keyLinks = null ): self { |
| 179 | $ret = new self; |
| 180 | if ( $offset instanceof Node || $offset === null ) { |
| 181 | $ret->unknownDimLinks = clone $this; |
| 182 | } else { |
| 183 | $ret->dimLinks[$offset] = clone $this; |
| 184 | } |
| 185 | $ret->keysLinks = $keyLinks; |
| 186 | return $ret; |
| 187 | } |
| 188 | |
| 189 | /** |
| 190 | * @param self $other |
| 191 | * @param int $depth |
| 192 | * @return self |
| 193 | */ |
| 194 | public function asMergedForAssignment( self $other, int $depth ): self { |
| 195 | if ( $depth === 0 ) { |
| 196 | return $other; |
| 197 | } |
| 198 | $ret = clone $this; |
| 199 | $ret->links->mergeWith( $other->links ); |
| 200 | if ( !$ret->keysLinks ) { |
| 201 | $ret->keysLinks = $other->keysLinks; |
| 202 | } elseif ( $other->keysLinks ) { |
| 203 | $ret->keysLinks->mergeWith( $other->keysLinks ); |
| 204 | } |
| 205 | if ( !$ret->unknownDimLinks ) { |
| 206 | $ret->unknownDimLinks = $other->unknownDimLinks; |
| 207 | } elseif ( $other->unknownDimLinks ) { |
| 208 | $ret->unknownDimLinks->mergeWith( $other->unknownDimLinks ); |
| 209 | } |
| 210 | foreach ( $other->dimLinks as $k => $v ) { |
| 211 | $ret->dimLinks[$k] = isset( $ret->dimLinks[$k] ) |
| 212 | ? $ret->dimLinks[$k]->asMergedForAssignment( $v, $depth - 1 ) |
| 213 | : $v; |
| 214 | } |
| 215 | $ret->normalize(); |
| 216 | return $ret; |
| 217 | } |
| 218 | |
| 219 | /** |
| 220 | * Remove offset links which are already present in the "main" links. This is done for performance |
| 221 | * (see test backpropoffsets-blowup). |
| 222 | * |
| 223 | * @todo Improve (e.g. recurse) |
| 224 | * @todo Might happen sometime earlier |
| 225 | */ |
| 226 | private function normalize(): void { |
| 227 | if ( !count( $this->links ) ) { |
| 228 | return; |
| 229 | } |
| 230 | foreach ( $this->dimLinks as $k => $links ) { |
| 231 | foreach ( $links->links as $func ) { |
| 232 | if ( $this->links->contains( $func ) ) { |
| 233 | $dimParams = array_keys( $links->links[$func]->getParams() ); |
| 234 | $thisParams = array_keys( $this->links[$func]->getParams() ); |
| 235 | $keepParams = array_diff( $dimParams, $thisParams ); |
| 236 | if ( !$keepParams ) { |
| 237 | unset( $links->links[$func] ); |
| 238 | } else { |
| 239 | $links->links[$func]->keepOnlyParams( $keepParams ); |
| 240 | } |
| 241 | } |
| 242 | } |
| 243 | if ( $links->isEmpty() ) { |
| 244 | unset( $this->dimLinks[$k] ); |
| 245 | } |
| 246 | } |
| 247 | if ( $this->unknownDimLinks ) { |
| 248 | foreach ( $this->unknownDimLinks->links as $func ) { |
| 249 | if ( $this->links->contains( $func ) ) { |
| 250 | $dimParams = array_keys( $this->unknownDimLinks->links[$func]->getParams() ); |
| 251 | $thisParams = array_keys( $this->links[$func]->getParams() ); |
| 252 | $keepParams = array_diff( $dimParams, $thisParams ); |
| 253 | if ( !$keepParams ) { |
| 254 | unset( $this->unknownDimLinks->links[$func] ); |
| 255 | } else { |
| 256 | $this->unknownDimLinks->links[$func]->keepOnlyParams( $keepParams ); |
| 257 | } |
| 258 | } |
| 259 | } |
| 260 | if ( $this->unknownDimLinks->isEmpty() ) { |
| 261 | $this->unknownDimLinks = null; |
| 262 | } |
| 263 | } |
| 264 | } |
| 265 | |
| 266 | /** |
| 267 | * Make sure to clone member variables, too. |
| 268 | */ |
| 269 | public function __clone() { |
| 270 | $this->links = clone $this->links; |
| 271 | foreach ( $this->dimLinks as $k => $links ) { |
| 272 | $this->dimLinks[$k] = clone $links; |
| 273 | } |
| 274 | if ( $this->unknownDimLinks ) { |
| 275 | $this->unknownDimLinks = clone $this->unknownDimLinks; |
| 276 | } |
| 277 | if ( $this->keysLinks ) { |
| 278 | $this->keysLinks = clone $this->keysLinks; |
| 279 | } |
| 280 | } |
| 281 | |
| 282 | /** |
| 283 | * Returns all the links stored in this object as a single LinkSet object, destroying the shape. This should only |
| 284 | * be used when the shape is not relevant. |
| 285 | * |
| 286 | * @return LinksSet |
| 287 | */ |
| 288 | public function getLinksCollapsing(): LinksSet { |
| 289 | $ret = clone $this->links; |
| 290 | foreach ( $this->dimLinks as $link ) { |
| 291 | $ret->mergeWith( $link->getLinksCollapsing() ); |
| 292 | } |
| 293 | if ( $this->unknownDimLinks ) { |
| 294 | $ret->mergeWith( $this->unknownDimLinks->getLinksCollapsing() ); |
| 295 | } |
| 296 | if ( $this->keysLinks ) { |
| 297 | $ret->mergeWith( $this->keysLinks ); |
| 298 | } |
| 299 | return $ret; |
| 300 | } |
| 301 | |
| 302 | /** |
| 303 | * @return array[] |
| 304 | * @phan-return array<array{0:FunctionInterface,1:int}> |
| 305 | */ |
| 306 | public function getMethodAndParamTuples(): array { |
| 307 | $ret = []; |
| 308 | foreach ( $this->links as $func ) { |
| 309 | $info = $this->links[$func]; |
| 310 | foreach ( $info->getParams() as $i => $_ ) { |
| 311 | $ret[] = [ $func, $i ]; |
| 312 | } |
| 313 | } |
| 314 | foreach ( $this->dimLinks as $link ) { |
| 315 | $ret = array_merge( $ret, $link->getMethodAndParamTuples() ); |
| 316 | } |
| 317 | if ( $this->unknownDimLinks ) { |
| 318 | $ret = array_merge( $ret, $this->unknownDimLinks->getMethodAndParamTuples() ); |
| 319 | } |
| 320 | foreach ( $this->keysLinks ?? [] as $func ) { |
| 321 | $info = $this->keysLinks[$func]; |
| 322 | foreach ( $info->getParams() as $i => $_ ) { |
| 323 | $ret[] = [ $func, $i ]; |
| 324 | } |
| 325 | } |
| 326 | return array_unique( $ret, SORT_REGULAR ); |
| 327 | } |
| 328 | |
| 329 | /** |
| 330 | * @return bool |
| 331 | */ |
| 332 | public function isEmpty(): bool { |
| 333 | if ( count( $this->links ) ) { |
| 334 | return false; |
| 335 | } |
| 336 | foreach ( $this->dimLinks as $links ) { |
| 337 | if ( !$links->isEmpty() ) { |
| 338 | return false; |
| 339 | } |
| 340 | } |
| 341 | if ( $this->unknownDimLinks && !$this->unknownDimLinks->isEmpty() ) { |
| 342 | return false; |
| 343 | } |
| 344 | if ( $this->keysLinks && count( $this->keysLinks ) ) { |
| 345 | return false; |
| 346 | } |
| 347 | return true; |
| 348 | } |
| 349 | |
| 350 | /** |
| 351 | * @param FunctionInterface $func |
| 352 | * @param int $i |
| 353 | * @return bool |
| 354 | */ |
| 355 | public function hasDataForFuncAndParam( FunctionInterface $func, int $i ): bool { |
| 356 | if ( $this->links->contains( $func ) && $this->links[$func]->hasParam( $i ) ) { |
| 357 | return true; |
| 358 | } |
| 359 | foreach ( $this->dimLinks as $dimLinks ) { |
| 360 | if ( $dimLinks->hasDataForFuncAndParam( $func, $i ) ) { |
| 361 | return true; |
| 362 | } |
| 363 | } |
| 364 | if ( $this->unknownDimLinks && $this->unknownDimLinks->hasDataForFuncAndParam( $func, $i ) ) { |
| 365 | return true; |
| 366 | } |
| 367 | if ( $this->keysLinks && $this->keysLinks->contains( $func ) && $this->keysLinks[$func]->hasParam( $i ) ) { |
| 368 | return true; |
| 369 | } |
| 370 | return false; |
| 371 | } |
| 372 | |
| 373 | /** |
| 374 | * @param FunctionInterface $func |
| 375 | * @param int $i |
| 376 | */ |
| 377 | public function initializeParamForFunc( FunctionInterface $func, int $i ): void { |
| 378 | if ( $this->links->contains( $func ) ) { |
| 379 | $this->links[$func]->addParam( $i ); |
| 380 | } else { |
| 381 | $this->links[$func] = SingleMethodLinks::newWithParam( $i ); |
| 382 | } |
| 383 | } |
| 384 | |
| 385 | /** |
| 386 | * Given some taint flags, return their intersection with the flags that can be preserved by this object |
| 387 | * @param int $taint |
| 388 | * @return int |
| 389 | */ |
| 390 | public function filterPreservedFlags( int $taint ): int { |
| 391 | return $taint & $this->getAllPreservedFlags(); |
| 392 | } |
| 393 | |
| 394 | /** |
| 395 | * @return int |
| 396 | */ |
| 397 | private function getAllPreservedFlags(): int { |
| 398 | $ret = SecurityCheckPlugin::NO_TAINT; |
| 399 | foreach ( $this->links as $func ) { |
| 400 | $ret |= $this->links[$func]->getAllPreservedFlags(); |
| 401 | } |
| 402 | foreach ( $this->dimLinks as $dimLinks ) { |
| 403 | $ret |= $dimLinks->getAllPreservedFlags(); |
| 404 | } |
| 405 | if ( $this->unknownDimLinks ) { |
| 406 | $ret |= $this->unknownDimLinks->getAllPreservedFlags(); |
| 407 | } |
| 408 | foreach ( $this->keysLinks ?? [] as $func ) { |
| 409 | $ret |= $this->keysLinks[$func]->getAllPreservedFlags(); |
| 410 | } |
| 411 | return $ret; |
| 412 | } |
| 413 | |
| 414 | /** |
| 415 | * @param FunctionInterface $func |
| 416 | * @param int $param |
| 417 | * @return PreservedTaintedness |
| 418 | */ |
| 419 | public function asPreservedTaintednessForFuncParam( FunctionInterface $func, int $param ): PreservedTaintedness { |
| 420 | $ret = null; |
| 421 | if ( $this->links->contains( $func ) ) { |
| 422 | $ownInfo = $this->links[$func]; |
| 423 | if ( $ownInfo->hasParam( $param ) ) { |
| 424 | $ret = new PreservedTaintedness( $ownInfo->getParamOffsets( $param ) ); |
| 425 | } |
| 426 | } |
| 427 | if ( !$ret ) { |
| 428 | $ret = new PreservedTaintedness( ParamLinksOffsets::newEmpty() ); |
| 429 | } |
| 430 | foreach ( $this->dimLinks as $dim => $dimLinks ) { |
| 431 | $ret->setOffsetTaintedness( $dim, $dimLinks->asPreservedTaintednessForFuncParam( $func, $param ) ); |
| 432 | } |
| 433 | if ( $this->unknownDimLinks ) { |
| 434 | $ret->setOffsetTaintedness( |
| 435 | null, |
| 436 | $this->unknownDimLinks->asPreservedTaintednessForFuncParam( $func, $param ) |
| 437 | ); |
| 438 | } |
| 439 | if ( $this->keysLinks && $this->keysLinks->contains( $func ) ) { |
| 440 | $keyInfo = $this->keysLinks[$func]; |
| 441 | if ( $keyInfo->hasParam( $param ) ) { |
| 442 | $ret->setKeysOffsets( $keyInfo->getParamOffsets( $param ) ); |
| 443 | } |
| 444 | } |
| 445 | return $ret; |
| 446 | } |
| 447 | |
| 448 | /** |
| 449 | * @param FunctionInterface $func |
| 450 | * @param int $param |
| 451 | * @return self |
| 452 | */ |
| 453 | public function asFilteredForFuncAndParam( FunctionInterface $func, int $param ): self { |
| 454 | $retLinks = new LinksSet(); |
| 455 | if ( $this->links->contains( $func ) ) { |
| 456 | $retLinks->attach( $func, $this->links[$func] ); |
| 457 | } |
| 458 | $ret = new self( $retLinks ); |
| 459 | foreach ( $this->dimLinks as $dim => $dimLinks ) { |
| 460 | $ret->setAtDim( $dim, $dimLinks->asFilteredForFuncAndParam( $func, $param ) ); |
| 461 | } |
| 462 | if ( $this->unknownDimLinks ) { |
| 463 | $ret->setAtDim( |
| 464 | null, |
| 465 | $this->unknownDimLinks->asFilteredForFuncAndParam( $func, $param ) |
| 466 | ); |
| 467 | } |
| 468 | if ( $this->keysLinks && $this->keysLinks->contains( $func ) ) { |
| 469 | $ret->keysLinks = new LinksSet(); |
| 470 | $ret->keysLinks->attach( $func, $this->keysLinks[$func] ); |
| 471 | } |
| 472 | return $ret; |
| 473 | } |
| 474 | |
| 475 | /** |
| 476 | * @param string $indent |
| 477 | * @return string |
| 478 | */ |
| 479 | public function toString( string $indent = '' ): string { |
| 480 | $elementsIndent = $indent . "\t"; |
| 481 | $ret = "{\n$elementsIndent" . 'OWN: ' . $this->links->__toString() . ','; |
| 482 | if ( $this->keysLinks ) { |
| 483 | $ret .= "\n{$elementsIndent}KEYS: " . $this->keysLinks->__toString() . ','; |
| 484 | } |
| 485 | if ( $this->dimLinks || $this->unknownDimLinks ) { |
| 486 | $ret .= "\n{$elementsIndent}CHILDREN: {"; |
| 487 | $childrenIndent = $elementsIndent . "\t"; |
| 488 | foreach ( $this->dimLinks as $key => $links ) { |
| 489 | $ret .= "\n$childrenIndent$key: " . $links->toString( $childrenIndent ) . ','; |
| 490 | } |
| 491 | if ( $this->unknownDimLinks ) { |
| 492 | $ret .= "\n$childrenIndent(UNKNOWN): " . $this->unknownDimLinks->toString( $childrenIndent ); |
| 493 | } |
| 494 | $ret .= "\n$elementsIndent}"; |
| 495 | } |
| 496 | return $ret . "\n$indent}"; |
| 497 | } |
| 498 | |
| 499 | /** |
| 500 | * @return string |
| 501 | */ |
| 502 | public function __toString(): string { |
| 503 | return $this->toString(); |
| 504 | } |
| 505 | } |