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知られざるSerialize
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Yuichi Sugiyama
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July 31, 2019
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知られざるSerialize
Yuichi Sugiyama
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July 31, 2019
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Transcript
ΒΕ͟ΔSerialize @PHP Study Cybozu Inc, Yuichi Sugiyama
Who am I • ਿࢁ ༞Ұ @oogFranz • αΠϘζ5ΤϯδχΞ •
େاۀ͚άϧʔϓΣΞ Λ࡞ͬͯΔʢPHP 7.2) • ෳۀδϟζϛϡʔδγϟϯ@MASHݭָஂ
serialize(), unserialize()ͬͯ·͔͢ʁ
serialize() όϦϕϯϦ $a = ["hoge", 3, true]; $a[] = &$a;
echo serialize($a); # a:4:{i:0;s:4:"hoge";i:1;i:3;i:2;b:1;i:3;a:4: {i:0;s:4:"hoge";i:1;i:3;i:2;b:1;i:3;R:5;}} • PHPͷΛ෮ݩՄೳͳจࣈྻʹม͢Δɻ • ΫϥεͷΠϯελϯεͰ͋ͬͯมՄೳʂ • DBʹอଘͰ͖ΔʂͬͨͶʂ
serialize() όϦϕϯϦ $a = ["hoge", 3, true]; $a[] = &$a;
echo serialize($a); # a:4:{i:0;s:4:"hoge";i:1;i:3;i:2;b:1;i:3;a:4: {i:0;s:4:"hoge";i:1;i:3;i:2;b:1;i:3;R:5;}} • PHPͷΛ෮ݩՄೳͳจࣈྻʹม͢Δɻ • ΫϥεͷΠϯελϯεͰ͋ͬͯมՄೳʂ • DBʹอଘͰ͖ΔʂͬͨͶʂ
Կ͕ʁ • serialize() ʹ࣮ͦΜͳʹͳ͍ • ٯؔͷunserialize()ʹ͍͔ͭ͘ͷ੬ऑੑ͕͋Δ
PHP Object Injection ʢPOIʣ • ҎԼͷ͕݅ຬͨ͞Ε͍ͯΔ߹ɺ։ൃऀ͕ҙਤ͍ͯ͠ͳ͍ ίʔυΛ߈ܸऀ͕࣮ߦͰ͖Δɻ • __wakeup(), __destruct()ͳͲͷϚδοΫϝιουʹ
෭࡞༻ͷ͋Δίʔυ͕ॻ͔Ε͍ͯΔ • unserialize()ͷҾʹϢʔβʔ͔Βͷೖྗ͕͞ΕΔ
ϚδοΫϝιου • ಛఆͷ݅ͰࣗಈͰൃಈ͢Δຐ๏ • serialize()ͷ࣮ߦ࣌ʹϚδοΫϝιουͷ __sleep() ͕ ͋ͬͨΒࣗಈͰ࣮ߦ͞ΕΔ • unserialize()࣌ʹɺϚδοΫϝιουͷ
__wakeup() ͕ ͋ͬͨΒࣗಈͰ࣮ߦ͞ΕΔ
αϯϓϧ class POIExample{ private $filename; public function __destruct() { unlink($this->filename);
} } unserialize('O:10:"POIExample":1:{s: 20:"POIExamplefilename";s:8:"test.php";}')
αϯϓϧ class POIExample{ private $filename; public function __destruct() { unlink($this->filename);
} } unserialize('O:10:"POIExample":1:{s: 20:"POIExamplefilename";s:8:"test.php";}') ߈ܸऀ͕ҙͷϑΝΠϧͷআ͕Մೳʂ
POIͷ͕͜͜ා͍ • ࣮ࡍʹunserializeʹ͞ΕΔ͜ͱ͕ͳ͍ΫϥεͰ͋ͬͯɺ auto_loadͷΈ͕͋Δͱ࣮ߦ͞Εͯ͠·͏ɻ • privateͷϝϯόมʹҙͷΛೖՄೳ setterΛհ͞ͳ͍ͷͰɺߟྀ͕͍͠ɻ • ԾʹsetterͰσΟϨΫτϦτϥόʔαϧΛ͍Ͱ͍ͯແҙຯ
• json_encode(), json_decode()Λ͏ɻ ˠΦϒδΣΫτΛγϦΞϥΠζɾσγϦΞϥΠζ͢ΔͷͰͳ͚Ε ेɻ • allowed_classesΦϓγϣϯΛ͏ ˠࢦఆ͞ΕͨΫϥεͷΦϒδΣΫτʹ͔͠ ɹม͞Εͳ͍͜ͱ͕อূ͞ΕΔ POIΛ͙ʹʁ
allowed_classes Φϓγϣϯ $serialized_str = 'O:10:"POIExample":1:{s:20:"POIExamplefilename";s: 8:"test.php";}'; $result = unserialize($serialized_str, ['allowed_classes'
=> false]); var_dump($result); /* object(__PHP_Incomplete_Class)#2 (2) { ["__PHP_Incomplete_Class_Name"]=> string(10) "POIExample" ["filename":"POIExample":private]=> string(8) "test.php" } */ echo serialize($result); // O:10:"POIExample":1:{s:20:"POIExamplefilename";s:8:"test.php";}
allowed_classesͰकΕΔͷ • ڐՄ͞Ε͍ͯͳ͍ΫϥεΛunserialize()͢Δͱɺ__PHP_Incomplete_Class ʹม͞ΕΔ • ͦͷΦϒδΣΫτΛ͏Ұserialize͢Δͱ ʢͳ͔ͥʣݩʹΔɻ • σϑΥϧτ true
(ΨόΨό)ͳͷͰ໌ࣔతʹࢦఆ͢Δඞཁ͕͋Δ • falseΛࢦఆ͢Εɺ͋ΒΏΔΫϥεΛڋઈ͢Δ
__PHP_Incomplete_ClassʹͳͬͨΒΤϥʔʹ͍ͨ͠ • ةͳ͍ͷ͕͖͍ͬͯͯΔͷͰΤϥʔʹ͍ͨ͠ • get_class Λͯ͠ɺ__PHP_Incomplete_Class ͔ΛௐΔ • unserialize_callback_func ݺͼग़͞Εͳ͍ͷͰҙɻ
allowed_classes͕͋Εunserializeͬ ͯྑ͍ʁ https://twitter.com/nikita_ppv/status/895571304325062656
allowed_classes͕͋Εunserializeͬ ͯྑ͍ʁ https://www.php.net/manual/ja/function.unserialize.php
unserializeͷ੬ऑੑ੬ऑੑͱΈͳ͞Εͳ͍ • ϝϞϦपΓͳͲͷෆ۩߹Ͱ͋ͬͯ੬ऑੑͱΈͳ͞Εͳ͍ Մೳੑ͕͋Δ • ΧδϡΞϧʹϝϞϦपΓͷෆ۩߹͕ใࠂ͞Ε͍ͯΔ
serializeͨ͠ΛDBʹೖΕΔ͜ͱʹ͍ͭͯ • SQL Ξϯνύλʔϯͷ 5ষ EAVʢΤϯςΟςΟɾΞτϦϏϡʔτɾόϦϡʔʣ ʹͳͬͯΔՄೳੑ͕ߴ͍ɻ
MySQLͱserialize • MySQLͷtextʹγϦΞϥΠζσʔλΛೖΕ͍ͯΔ߹ɺ จࣈ͕Φʔόʔ͢Δͱɺ్தͰΒΕͯ͠·͍ɺ ෮ݩͰ͖ͳ͘ͳΔɻʢStrict SQL Modeʹґଘʣ • MySQL 5.7͔ΒJSONܕ͕͑ΔΑ͏ʹͳͬͨͷͰɺ
ಈతεΩʔϚ͕Ͳ͏ͯ͠ඞཁͳ߹JSONܕΛߟ͑ͨํ͕ Αͦ͞͏ɻ
·ͱΊ • serialize(), unserialize()Λ͍ͬͯͳ͍ͷͳΒɺͦΕ͕Ұ൪ • ͍ͬͯ͠ΔͷͳΒɺPOIΛ͙ͨΊɺϢʔβʔೖྗσʔλ͕ೖͬͯ͜ͳ͍͜ͳ͍͜ͱΛ͔֬Ί Α͏ • ՄೳͰ͋Εjson_encode, json_decodeʹஔ͖͔͑Α͏
• ͦΕແཧͳΒɺallowed_classesΦϓγϣϯͰPOI͠ͷ͝͏ • DBʹอଘ͠ͳ͍Α͏ʹ͠·͠ΐ͏ • ϝϞϦपΓͷෆ۩߹͋ΔͷͰஔ͖͑Λݕ౼͠·͠ΐ͏ɻ