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Add a linter rule to detect the use of blacklisted functions

Summary:
As mentioned in the [[https://secure.phabricator.com/book/phabcontrib/article/php_coding_standards/ | Phabricator PHP coding standards]], the `eval` function should be avoided. There is some good discussion on [[http://stackoverflow.com/questions/951373/when-is-eval-evil-in-php | StackOverflow]] as well.

Having said that, instead of hardcoding `eval()`, I have generalised this enough to allow a set of "blacklisted" functions to be defined with `xhpast.blacklisted.function` in the `.arclint` file.

Test Plan: Added a test case.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D10686
This commit is contained in:
Joshua Spence 2015-01-05 10:51:33 +11:00
parent eb3129408b
commit d477df00eb
3 changed files with 53 additions and 2 deletions

View file

@ -41,7 +41,19 @@
"exclude": "(resources/spelling/.*\\.json$)"
},
"text": {
"type": "text"
"type": "text",
"exclude": [
"(^\\.arclint$)"
]
},
"text-without-length": {
"type": "text",
"severity": {
"3": "disabled"
},
"include": [
"(^\\.arclint$)"
]
},
"xhpast": {
"type": "xhpast",
@ -50,6 +62,9 @@
"16": "advice",
"34": "error"
},
"xhpast.blacklisted.function": {
"eval": "The eval() function should be avoided. It is potentially unsafe and makes debugging more difficult."
},
"xhpast.php-version": "5.2.3",
"xhpast.php-version.windows": "5.3.0"
}

View file

@ -50,7 +50,9 @@ final class ArcanistXHPASTLinter extends ArcanistBaseXHPASTLinter {
const LINT_ARRAY_SEPARATOR = 48;
const LINT_CONSTRUCTOR_PARENTHESES = 49;
const LINT_DUPLICATE_SWITCH_CASE = 50;
const LINT_BLACKLISTED_FUNCTION = 50;
private $blacklistedFunctions = array();
private $naminghook;
private $switchhook;
private $version;
@ -111,6 +113,7 @@ final class ArcanistXHPASTLinter extends ArcanistBaseXHPASTLinter {
self::LINT_ARRAY_SEPARATOR => 'Array Separator',
self::LINT_CONSTRUCTOR_PARENTHESES => 'Constructor Parentheses',
self::LINT_DUPLICATE_SWITCH_CASE => 'Duplicate Case Statements',
self::LINT_BLACKLISTED_FUNCTION => 'Use of Blacklisted Function',
);
}
@ -157,6 +160,10 @@ final class ArcanistXHPASTLinter extends ArcanistBaseXHPASTLinter {
public function getLinterConfigurationOptions() {
return parent::getLinterConfigurationOptions() + array(
'xhpast.blacklisted.function' => array(
'type' => 'optional map<string, string>',
'help' => pht('Blacklisted functions which should not be used.'),
),
'xhpast.naminghook' => array(
'type' => 'optional string',
'help' => pht(
@ -182,6 +189,9 @@ final class ArcanistXHPASTLinter extends ArcanistBaseXHPASTLinter {
public function setLinterConfigurationValue($key, $value) {
switch ($key) {
case 'xhpast.blacklisted.function':
$this->blacklistedFunctions = $value;
return;
case 'xhpast.naminghook':
$this->naminghook = $value;
return;
@ -201,7 +211,7 @@ final class ArcanistXHPASTLinter extends ArcanistBaseXHPASTLinter {
public function getVersion() {
// The version number should be incremented whenever a new rule is added.
return '12';
return '13';
}
protected function resolveFuture($path, Future $future) {
@ -274,6 +284,7 @@ final class ArcanistXHPASTLinter extends ArcanistBaseXHPASTLinter {
'lintArraySeparator' => self::LINT_ARRAY_SEPARATOR,
'lintConstructorParentheses' => self::LINT_CONSTRUCTOR_PARENTHESES,
'lintSwitchStatements' => self::LINT_DUPLICATE_SWITCH_CASE,
'lintBlacklistedFunction' => self::LINT_BLACKLISTED_FUNCTION,
);
foreach ($method_codes as $method => $codes) {
@ -2969,6 +2980,24 @@ final class ArcanistXHPASTLinter extends ArcanistBaseXHPASTLinter {
}
}
private function lintBlacklistedFunction(XHPASTNode $root) {
$calls = $root->selectDescendantsOfType('n_FUNCTION_CALL');
foreach ($calls as $call) {
$node = $call->getChildByIndex(0);
$name = $node->getConcreteString();
$reason = idx($this->blacklistedFunctions, $name);
if ($reason) {
$this->raiseLintAtNode(
$node,
self::LINT_BLACKLISTED_FUNCTION,
$reason);
}
}
}
public function getSuperGlobalNames() {
return array(
'$GLOBALS',

View file

@ -0,0 +1,7 @@
<?php
eval('evil code');
~~~~~~~~~~
error:2:1
~~~~~~~~~~
~~~~~~~~~~
{"config": {"xhpast.blacklisted.function": {"eval": "Evil function"}}}