java 防止JS注入（使用ESAPI进行编码）_esapi.encoder().encodeforhtml

今天在做报表导入的时候遇到测试在excel数据里面填了一段js代码,导致数据回显到页面的时候弹一个框出来，这个框我想大家都懂了，又恰好逢项目在做代码安全扫描，
扫描工具使用的是Fortify

关于ESAPI的介绍可查看：
https://blog.csdn.net/qq_35623773/article/details/100126615

安全工具推荐使用ESAPI.encoder().encodeForHTML来对html字符串进行编码，那我们就来开始尝试吧。
1. 引入esapi依赖

<!-- https://mvnrepository.com/artifact/org.owasp.esapi/esapi -->
<dependency>
    <groupId>org.owasp.esapi</groupId>
    <artifactId>esapi</artifactId>
    <version>2.2.0.0</version>
</dependency>
<!--   必须引入log4j依赖，不然初始化 esapi时会报错    -->
<dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>1.2.17</version>
</dependency>
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2. 引入esapi配置文件
配置文件可从github上获取 https://github.com/ESAPI/esapi-java-legacy
找到对应版本的分支，以zip形式下载源码到本地，解压
找到以下俩个文件复制到项目的resource目录下，具体配置可查看配置文件的注释

这俩个文件在源码中路径： esapi-java-legacy-2.2.0.0\configuration\esapi

3. 编写代码

如果我们返回的字符串是一段html，但只解析js,可以参考以下方式：

@GetMapping("/hi")
public String hi() {
    StringBuilder sb = new StringBuilder();
    sb.append("<div style=\"color:red;\">aaaaa</div>")
      .append(ESAPI.encoder().encodeForHTML("<script>alert(1)</script>"));
    
    //String jsCode = "<div style=\"color:red;\">aaaaa</div><script>alert(1)</script>";
    //String jsEncoder = ESAPI.encoder().encodeForHTML(jsCode);
    return sb.toString();
}
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页面展示效果：

中间的js代码就会以文本的形式展示。

4. encodeForHTML()源码解析：

该方法执行最终会根据unicode编码从map对象中获取对应的替代字符来替换js中的特定字符。
该map中包含以下数据：

private static synchronized Map<Integer, String>
mkCharacterToEntityMap() {
Map<Integer, String> map = new HashMap(252);
map.put(34, “quot”);
map.put(38, “amp”);
map.put(60, “lt”);
map.put(62, “gt”);
map.put(160, “nbsp”);
map.put(161, “iexcl”);
map.put(162, “cent”);
map.put(163, “pound”);
map.put(164, “curren”);
map.put(165, “yen”);
map.put(166, “brvbar”);
map.put(167, “sect”);
map.put(168, “uml”);
map.put(169, “copy”);
map.put(170, “ordf”);
map.put(171, “laquo”);
map.put(172, “not”);
map.put(173, “shy”);
map.put(174, “reg”);
map.put(175, “macr”);
map.put(176, “deg”);
map.put(177, “plusmn”);
map.put(178, “sup2”);
map.put(179, “sup3”);
map.put(180, “acute”);
map.put(181, “micro”);
map.put(182, “para”);
map.put(183, “middot”);
map.put(184, “cedil”);
map.put(185, “sup1”);
map.put(186, “ordm”);
map.put(187, “raquo”);
map.put(188, “frac14”);
map.put(189, “frac12”);
map.put(190, “frac34”);
map.put(191, “iquest”);
map.put(192, “Agrave”);
map.put(193, “Aacute”);
map.put(194, “Acirc”);
map.put(195, “Atilde”);
map.put(196, “Auml”);
map.put(197, “Aring”);
map.put(198, “AElig”);
map.put(199, “Ccedil”);
map.put(200, “Egrave”);
map.put(201, “Eacute”);
map.put(202, “Ecirc”);
map.put(203, “Euml”);
map.put(204, “Igrave”);
map.put(205, “Iacute”);
map.put(206, “Icirc”);
map.put(207, “Iuml”);
map.put(208, “ETH”);
map.put(209, “Ntilde”);
map.put(210, “Ograve”);
map.put(211, “Oacute”);
map.put(212, “Ocirc”);
map.put(213, “Otilde”);
map.put(214, “Ouml”);
map.put(215, “times”);
map.put(216, “Oslash”);
map.put(217, “Ugrave”);
map.put(218, “Uacute”);
map.put(219, “Ucirc”);
map.put(220, “Uuml”);
map.put(221, “Yacute”);
map.put(222, “THORN”);
map.put(223, “szlig”);
map.put(224, “agrave”);
map.put(225, “aacute”);
map.put(226, “acirc”);
map.put(227, “atilde”);
map.put(228, “auml”);
map.put(229, “aring”);
map.put(230, “aelig”);
map.put(231, “ccedil”);
map.put(232, “egrave”);
map.put(233, “eacute”);
map.put(234, “ecirc”);
map.put(235, “euml”);
map.put(236, “igrave”);
map.put(237, “iacute”);
map.put(238, “icirc”);
map.put(239, “iuml”);
map.put(240, “eth”);
map.put(241, “ntilde”);
map.put(242, “ograve”);
map.put(243, “oacute”);
map.put(244, “ocirc”);
map.put(245, “otilde”);
map.put(246, “ouml”);
map.put(247, “divide”);
map.put(248, “oslash”);
map.put(249, “ugrave”);
map.put(250, “uacute”);
map.put(251, “ucirc”);
map.put(252, “uuml”);
map.put(253, “yacute”);
map.put(254, “thorn”);
map.put(255, “yuml”);
map.put(338, “OElig”);
map.put(339, “oelig”);
map.put(352, “Scaron”);
map.put(353, “scaron”);
map.put(376, “Yuml”);
map.put(402, “fnof”);
map.put(710, “circ”);
map.put(732, “tilde”);
map.put(913, “Alpha”);
map.put(914, “Beta”);
map.put(915, “Gamma”);
map.put(916, “Delta”);
map.put(917, “Epsilon”);
map.put(918, “Zeta”);
map.put(919, “Eta”);
map.put(920, “Theta”);
map.put(921, “Iota”);
map.put(922, “Kappa”);
map.put(923, “Lambda”);
map.put(924, “Mu”);
map.put(925, “Nu”);
map.put(926, “Xi”);
map.put(927, “Omicron”);
map.put(928, “Pi”);
map.put(929, “Rho”);
map.put(931, “Sigma”);
map.put(932, “Tau”);
map.put(933, “Upsilon”);
map.put(934, “Phi”);
map.put(935, “Chi”);
map.put(936, “Psi”);
map.put(937, “Omega”);
map.put(945, “alpha”);
map.put(946, “beta”);
map.put(947, “gamma”);
map.put(948, “delta”);
map.put(949, “epsilon”);
map.put(950, “zeta”);
map.put(951, “eta”);
map.put(952, “theta”);
map.put(953, “iota”);
map.put(954, “kappa”);
map.put(955, “lambda”);
map.put(956, “mu”);
map.put(957, “nu”);
map.put(958, “xi”);
map.put(959, “omicron”);
map.put(960, “pi”);
map.put(961, “rho”);
map.put(962, “sigmaf”);
map.put(963, “sigma”);
map.put(964, “tau”);
map.put(965, “upsilon”);
map.put(966, “phi”);
map.put(967, “chi”);
map.put(968, “psi”);
map.put(969, “omega”);
map.put(977, “thetasym”);
map.put(978, “upsih”);
map.put(982, “piv”);
map.put(8194, “ensp”);
map.put(8195, “emsp”);
map.put(8201, “thinsp”);
map.put(8204, “zwnj”);
map.put(8205, “zwj”);
map.put(8206, “lrm”);
map.put(8207, “rlm”);
map.put(8211, “ndash”);
map.put(8212, “mdash”);
map.put(8216, “lsquo”);
map.put(8217, “rsquo”);
map.put(8218, “sbquo”);
map.put(8220, “ldquo”);
map.put(8221, “rdquo”);
map.put(8222, “bdquo”);
map.put(8224, “dagger”);
map.put(8225, “Dagger”);
map.put(8226, “bull”);
map.put(8230, “hellip”);
map.put(8240, “permil”);
map.put(8242, “prime”);
map.put(8243, “Prime”);
map.put(8249, “lsaquo”);
map.put(8250, “rsaquo”);
map.put(8254, “oline”);
map.put(8260, “frasl”);
map.put(8364, “euro”);
map.put(8465, “image”);
map.put(8472, “weierp”);
map.put(8476, “real”);
map.put(8482, “trade”);
map.put(8501, “alefsym”);
map.put(8592, “larr”);
map.put(8593, “uarr”);
map.put(8594, “rarr”);
map.put(8595, “darr”);
map.put(8596, “harr”);
map.put(8629, “crarr”);
map.put(8656, “lArr”);
map.put(8657, “uArr”);
map.put(8658, “rArr”);
map.put(8659, “dArr”);
map.put(8660, “hArr”);
map.put(8704, “forall”);
map.put(8706, “part”);
map.put(8707, “exist”);
map.put(8709, “empty”);
map.put(8711, “nabla”);
map.put(8712, “isin”);
map.put(8713, “notin”);
map.put(8715, “ni”);
map.put(8719, “prod”);
map.put(8721, “sum”);
map.put(8722, “minus”);
map.put(8727, “lowast”);
map.put(8730, “radic”);
map.put(8733, “prop”);
map.put(8734, “infin”);
map.put(8736, “ang”);
map.put(8743, “and”);
map.put(8744, “or”);
map.put(8745, “cap”);
map.put(8746, “cup”);
map.put(8747, “int”);
map.put(8756, “there4”);
map.put(8764, “sim”);
map.put(8773, “cong”);
map.put(8776, “asymp”);
map.put(8800, “ne”);
map.put(8801, “equiv”);
map.put(8804, “le”);
map.put(8805, “ge”);
map.put(8834, “sub”);
map.put(8835, “sup”);
map.put(8836, “nsub”);
map.put(8838, “sube”);
map.put(8839, “supe”);
map.put(8853, “oplus”);
map.put(8855, “otimes”);
map.put(8869, “perp”);
map.put(8901, “sdot”);
map.put(8968, “lceil”);
map.put(8969, “rceil”);
map.put(8970, “lfloor”);
map.put(8971, “rfloor”);
map.put(9001, “lang”);
map.put(9002, “rang”);
map.put(9674, “loz”);
map.put(9824, “spades”);
map.put(9827, “clubs”);
map.put(9829, “hearts”);
map.put(9830, “diams”);
return Collections.unmodifiableMap(map);
}

今天暂时就到这里了，后续有问题再继续更新