此仓库fork自derickr/vld，在尽量不改变已有代码的前提下，添加了json输出支持。
移步至README.rst。
为了对PHP源码做XSS检测，需要提取vld输出信息做分析。vld的原版信息输出格式不方便做提取，故自行为其添加json输出。
现有test.php内容如下
<!DOCTYPE html>
<html>
<head/>
<body>
<?php
function tainte($src)
{
$dst = $src + 0;
return "<div id='". $dst."'>content</div>";
}
$array = array();
$array[] = 'safe' ;
$array[] = $_GET['userData'] ;
$array[] = 'safe' ;
$tainted = $array[1] ;
$tainted = tainte($tainted);
echo $tainted;
?>
<h1>Hello World!</h1>
</body>
</html>执行php -dvld.active=1 -dvld.execute=0 -dvld.dump_json=1 -dvld.format test.php得到以下输出。
[
{
"class": null,
"filename": "/home/dev/test.php",
"function name": null,
"number of ops": 20,
"compiled vars": ["array", "tainted"],
"ops": {
"line": [1, 7, 13, 14, null, 15, null, null, null, 16, null, 17, null, 19, null, null, null, 21, 24, 27],
"#": [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19],
"*": [null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null],
"E": ["E", null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null],
"I": [">", null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null],
"O": [null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, ">"],
"op_code": [40, 0, 38, 147, 137, 80, 81, 147, 137, 147, 137, 81, 38, 61, 117, 60, 38, 40, 40, 62],
"op": ["ECHO", "NOP", "ASSIGN", "ASSIGN_DIM", "OP_DATA", "FETCH_R", "FETCH_DIM_R", "ASSIGN_DIM", "OP_DATA", "ASSIGN_DIM", "OP_DATA", "FETCH_DIM_R", "ASSIGN", "INIT_FCALL", "SEND_VAR", "DO_FCALL", "ASSIGN", "ECHO", "ECHO", "RETURN"],
"fetch": ["", "", "", "", "", "global", "", "", "", "", "", "", "", "", "", "", "", "", "", ""],
"ext": [null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, 0, null, null, null, null],
"return_type": [null, null, null, null, null, "IS_TMP_VAR", "IS_TMP_VAR", null, null, null, null, "IS_TMP_VAR", null, null, null, "IS_VAR", null, null, null, null],
"return": [null, null, null, null, null, "~5", "~6", null, null, null, null, "~8", null, null, null, "$10", null, null, null, null],
"op1_type": ["IS_CONST (40)", null, "IS_CV", "IS_CV", "IS_CONST (34)", "IS_CONST (33)", "IS_TMP_VAR", "IS_CV", "IS_TMP_VAR", "IS_CV", "IS_CONST (25)", "IS_CV", "IS_CV", "IS_UNUSED", "IS_CV", "IS_UNUSED", "IS_CV", "IS_CV", "IS_CONST (12)", "IS_CONST (11)"],
"op1": ["%3C%21DOCTYPE+html%3E%0A%3Chtml%3E%0A%3Chead%2F%3E%0A%3Cbody%3E%0A", null, "!0", "!0", "safe", "_GET", "~5", "!0", "~6", "!0", "safe", "!0", "!1", null, "!1", null, "!1", "!1", "%3Ch1%3EHello+World%21%3C%2Fh1%3E%0A%3C%2Fbody%3E%0A%3C%2Fhtml%3E%0A", 1],
"op2_type": [null, null, "IS_CONST (37)", "IS_UNUSED", "IS_UNUSED", null, "IS_CONST (32)", "IS_UNUSED", "IS_UNUSED", "IS_UNUSED", "IS_UNUSED", "IS_CONST (24)", "IS_TMP_VAR", "IS_CONST (21)", "IS_UNUSED", null, "IS_VAR", null, null, null],
"op2": [null, null, "<array>", null, null, null, "userData", null, null, null, null, 1, "~8", "tainte", null, null, "$10", null, null, null],
"ext_op_type": [null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null],
"ext_op": [null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null]
},
"path": [[0]],
"branch": {
"sline": [1],
"eline": [27],
"sop": [0],
"eop": [19],
"outs": [[-2]]
}
},
{
"class": null,
"filename": "/home/dev/test.php",
"function name": "tainte",
"number of ops": 7,
"compiled vars": ["src", "dst"],
"ops": {
"line": [7, 9, null, 10, null, null, 11],
"#": [0, 1, 2, 3, 4, 5, 6],
"*": [null, null, null, null, null, null, "*"],
"E": ["E", null, null, null, null, null, null],
"I": [">", null, null, null, null, null, null],
"O": [null, null, null, null, null, ">", ">"],
"op_code": [63, 1, 38, 8, 8, 62, 62],
"op": ["RECV", "ADD", "ASSIGN", "CONCAT", "CONCAT", "RETURN", "RETURN"],
"fetch": ["", "", "", "", "", "", ""],
"ext": [null, null, null, null, null, null, null],
"return_type": ["IS_CV", "IS_TMP_VAR", null, "IS_TMP_VAR", "IS_TMP_VAR", null, null],
"return": ["!0", "~2", null, "~4", "~5", null, null],
"op1_type": ["IS_UNUSED", "IS_CV", "IS_CV", "IS_CONST (9)", "IS_TMP_VAR", "IS_TMP_VAR", "IS_CONST (5)"],
"op1": [null, "!0", "!1", "%3Cdiv+id%3D%27", "~4", "~5", null],
"op2_type": [null, "IS_CONST (12)", "IS_TMP_VAR", "IS_CV", "IS_CONST (8)", null, null],
"op2": [null, 0, "~2", "!1", "%27%3Econtent%3C%2Fdiv%3E", null, null],
"ext_op_type": [null, null, null, null, null, null, null],
"ext_op": [null, null, null, null, null, null, null]
},
"path": [[0]],
"branch": {
"sline": [7],
"eline": [11],
"sop": [0],
"eop": [6],
"outs": [[]]
}
}]相比原版纯文本输出，对编程调用更为友好。
现假设我们需要对一批(10000+)独立的php脚本进行分析，且工作目录结构如下图所示。
pwd
|--samples
|--good
| |--g0001.php
| |--g0002.php
| ```
|--bad
|--b0001.php
|--b0002.php
```本仓库的utils子目录提供了一个用于快速生成同构路径信息的使用程序，自行编译并复制至系统PATH。
$ gcc utils/chloc.c -o utils/chloc && cp utils/chloc /usr/local/bin/
# 复制文件至/usr/local/bin/需要root权限或sudo提取然后，手动创建同结构的子目录（opcodes）用于存放vld的输出（如下图所示）。
pwd
|--samples
|--opcodes
|--good
|--bad使用find和awk批量构建vld调用命令，具体命令如下。
$ export vld="php -dvld.active=1 -dvld.execute=0 -dvld.dump_json=1 -dvld.format=1 -dvld.verbosity=3"
# 通过环境变量向awk传递vld命令
$ find . -wholename "./samples/good/*.php" -or -wholename "./samples/bad/*.php"\
|awk '{cmd="chloc . ./opcodes .json "$1;
cmd|getline dst;
print vld, $1, ">",dst;
close(cmd);
print "echo -ne \r No.",NR," "}' vld="$VLD_COMMAND"|bash && \
echo -e "\ndone"以上命令可以在指定的子目录生成对应的json格式的vld分析报告，并附带进度显示。
-
补上原版输出中的branch info内容。 -
添加对class_table和function_table的支持。 -
提供调用脚本demo(项目于2020/7月下旬开始了重构，原脚本作废) -
对大体积json输出做内存优化，防内存错误。 - 等待新需求出现(欢迎提交issues)。
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