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[原创]dex vmp虚拟化
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发表于: 2018-12-29 11:23
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简介dex vmp是传说中的第四代加固技术，它的表现形式是 把本身是java代码变成native代码 原理很简单就是把java代码method结构体中的二进制指令抽出来 本地解析二进制指令集 这样破解者变的很难看smali 或是java
e.g
程序vmp虚拟化之后
1.先实现把method 二进制 存储成文件 用baksmali 复写
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | public static short[] getInstructions(DexBackedMethod dexBackedMethod) { int codeOffset = getCodeOffset(dexBackedMethod); DexBackedDexFile dexFile = dexBackedMethod.getImplementation().dexFile; // 这个size指是u2数组的元素个数。 int instructionsSize = dexFile.readSmallUint(codeOffset + CodeItem.INSTRUCTION_COUNT_OFFSET); int instructionsStartOffset = codeOffset + CodeItem.INSTRUCTION_START_OFFSET; short[] insts = new short[instructionsSize]; for (int i = 0; i < instructionsSize; i++) { insts[i] = (short) dexFile.readUshort(instructionsStartOffset); instructionsStartOffset += 2; } return insts; } |
2.解析二进制指令集
smali指令有256个指令集 http://androidxref.com/4.4.4_r1/xref/dalvik/libdex/DexOpcodes.h
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 | enum Opcode { // BEGIN(libdex-opcode-enum); GENERATED AUTOMATICALLY BY opcode-gen OP_NOP = 0x00, OP_MOVE = 0x01, OP_MOVE_FROM16 = 0x02, OP_MOVE_16 = 0x03, OP_MOVE_WIDE = 0x04, OP_MOVE_WIDE_FROM16 = 0x05, OP_MOVE_WIDE_16 = 0x06, OP_MOVE_OBJECT = 0x07, OP_MOVE_OBJECT_FROM16 = 0x08, OP_MOVE_OBJECT_16 = 0x09, OP_MOVE_RESULT = 0x0a, OP_MOVE_RESULT_WIDE = 0x0b, OP_MOVE_RESULT_OBJECT = 0x0c, OP_MOVE_EXCEPTION = 0x0d, OP_RETURN_VOID = 0x0e, OP_RETURN = 0x0f, OP_RETURN_WIDE = 0x10, OP_RETURN_OBJECT = 0x11, OP_CONST_4 = 0x12, OP_CONST_16 = 0x13, OP_CONST = 0x14, OP_CONST_HIGH16 = 0x15, OP_CONST_WIDE_16 = 0x16, OP_CONST_WIDE_32 = 0x17, OP_CONST_WIDE = 0x18, OP_CONST_WIDE_HIGH16 = 0x19, OP_CONST_STRING = 0x1a, OP_CONST_STRING_JUMBO = 0x1b, OP_CONST_CLASS = 0x1c, OP_MONITOR_ENTER = 0x1d, OP_MONITOR_EXIT = 0x1e, OP_CHECK_CAST = 0x1f, OP_INSTANCE_OF = 0x20, OP_ARRAY_LENGTH = 0x21, OP_NEW_INSTANCE = 0x22, OP_NEW_ARRAY = 0x23, OP_FILLED_NEW_ARRAY = 0x24, OP_FILLED_NEW_ARRAY_RANGE = 0x25, OP_FILL_ARRAY_DATA = 0x26, OP_THROW = 0x27, OP_GOTO = 0x28, OP_GOTO_16 = 0x29, OP_GOTO_32 = 0x2a, OP_PACKED_SWITCH = 0x2b, OP_SPARSE_SWITCH = 0x2c, OP_CMPL_FLOAT = 0x2d, OP_CMPG_FLOAT = 0x2e, OP_CMPL_DOUBLE = 0x2f, OP_CMPG_DOUBLE = 0x30, OP_CMP_LONG = 0x31, OP_IF_EQ = 0x32, OP_IF_NE = 0x33, OP_IF_LT = 0x34, OP_IF_GE = 0x35, OP_IF_GT = 0x36, OP_IF_LE = 0x37, OP_IF_EQZ = 0x38, OP_IF_NEZ = 0x39, OP_IF_LTZ = 0x3a, OP_IF_GEZ = 0x3b, OP_IF_GTZ = 0x3c, OP_IF_LEZ = 0x3d, OP_UNUSED_3E = 0x3e, OP_UNUSED_3F = 0x3f, OP_UNUSED_40 = 0x40, OP_UNUSED_41 = 0x41, OP_UNUSED_42 = 0x42, OP_UNUSED_43 = 0x43, OP_AGET = 0x44, OP_AGET_WIDE = 0x45, OP_AGET_OBJECT = 0x46, OP_AGET_BOOLEAN = 0x47, OP_AGET_BYTE = 0x48, OP_AGET_CHAR = 0x49, OP_AGET_SHORT = 0x4a, OP_APUT = 0x4b, OP_APUT_WIDE = 0x4c, OP_APUT_OBJECT = 0x4d, OP_APUT_BOOLEAN = 0x4e, OP_APUT_BYTE = 0x4f, OP_APUT_CHAR = 0x50, OP_APUT_SHORT = 0x51, OP_IGET = 0x52, OP_IGET_WIDE = 0x53, OP_IGET_OBJECT = 0x54, OP_IGET_BOOLEAN = 0x55, OP_IGET_BYTE = 0x56, OP_IGET_CHAR = 0x57, OP_IGET_SHORT = 0x58, OP_IPUT = 0x59, OP_IPUT_WIDE = 0x5a, OP_IPUT_OBJECT = 0x5b, OP_IPUT_BOOLEAN = 0x5c, OP_IPUT_BYTE = 0x5d, OP_IPUT_CHAR = 0x5e, OP_IPUT_SHORT = 0x5f, OP_SGET = 0x60, OP_SGET_WIDE = 0x61, OP_SGET_OBJECT = 0x62, OP_SGET_BOOLEAN = 0x63, OP_SGET_BYTE = 0x64, OP_SGET_CHAR = 0x65, OP_SGET_SHORT = 0x66, OP_SPUT = 0x67, OP_SPUT_WIDE = 0x68, OP_SPUT_OBJECT = 0x69, OP_SPUT_BOOLEAN = 0x6a, OP_SPUT_BYTE = 0x6b, OP_SPUT_CHAR = 0x6c, OP_SPUT_SHORT = 0x6d, OP_INVOKE_VIRTUAL = 0x6e, OP_INVOKE_SUPER = 0x6f, OP_INVOKE_DIRECT = 0x70, OP_INVOKE_STATIC = 0x71, OP_INVOKE_INTERFACE = 0x72, OP_UNUSED_73 = 0x73, OP_INVOKE_VIRTUAL_RANGE = 0x74, OP_INVOKE_SUPER_RANGE = 0x75, OP_INVOKE_DIRECT_RANGE = 0x76, OP_INVOKE_STATIC_RANGE = 0x77, OP_INVOKE_INTERFACE_RANGE = 0x78, OP_UNUSED_79 = 0x79, OP_UNUSED_7A = 0x7a, OP_NEG_INT = 0x7b, OP_NOT_INT = 0x7c, OP_NEG_LONG = 0x7d, OP_NOT_LONG = 0x7e, OP_NEG_FLOAT = 0x7f, OP_NEG_DOUBLE = 0x80, OP_INT_TO_LONG = 0x81, OP_INT_TO_FLOAT = 0x82, OP_INT_TO_DOUBLE = 0x83, OP_LONG_TO_INT = 0x84, OP_LONG_TO_FLOAT = 0x85, OP_LONG_TO_DOUBLE = 0x86, OP_FLOAT_TO_INT = 0x87, OP_FLOAT_TO_LONG = 0x88, OP_FLOAT_TO_DOUBLE = 0x89, OP_DOUBLE_TO_INT = 0x8a, OP_DOUBLE_TO_LONG = 0x8b, OP_DOUBLE_TO_FLOAT = 0x8c, OP_INT_TO_BYTE = 0x8d, OP_INT_TO_CHAR = 0x8e, OP_INT_TO_SHORT = 0x8f, OP_ADD_INT = 0x90, OP_SUB_INT = 0x91, OP_MUL_INT = 0x92, OP_DIV_INT = 0x93, OP_REM_INT = 0x94, OP_AND_INT = 0x95, OP_OR_INT = 0x96, OP_XOR_INT = 0x97, OP_SHL_INT = 0x98, OP_SHR_INT = 0x99, OP_USHR_INT = 0x9a, OP_ADD_LONG = 0x9b, OP_SUB_LONG = 0x9c, OP_MUL_LONG = 0x9d, OP_DIV_LONG = 0x9e, OP_REM_LONG = 0x9f, OP_AND_LONG = 0xa0, OP_OR_LONG = 0xa1, OP_XOR_LONG = 0xa2, OP_SHL_LONG = 0xa3, OP_SHR_LONG = 0xa4, OP_USHR_LONG = 0xa5, OP_ADD_FLOAT = 0xa6, OP_SUB_FLOAT = 0xa7, OP_MUL_FLOAT = 0xa8, OP_DIV_FLOAT = 0xa9, OP_REM_FLOAT = 0xaa, OP_ADD_DOUBLE = 0xab, OP_SUB_DOUBLE = 0xac, OP_MUL_DOUBLE = 0xad, OP_DIV_DOUBLE = 0xae, OP_REM_DOUBLE = 0xaf, OP_ADD_INT_2ADDR = 0xb0, OP_SUB_INT_2ADDR = 0xb1, OP_MUL_INT_2ADDR = 0xb2, OP_DIV_INT_2ADDR = 0xb3, OP_REM_INT_2ADDR = 0xb4, OP_AND_INT_2ADDR = 0xb5, OP_OR_INT_2ADDR = 0xb6, OP_XOR_INT_2ADDR = 0xb7, OP_SHL_INT_2ADDR = 0xb8, OP_SHR_INT_2ADDR = 0xb9, OP_USHR_INT_2ADDR = 0xba, OP_ADD_LONG_2ADDR = 0xbb, OP_SUB_LONG_2ADDR = 0xbc, OP_MUL_LONG_2ADDR = 0xbd, OP_DIV_LONG_2ADDR = 0xbe, OP_REM_LONG_2ADDR = 0xbf, OP_AND_LONG_2ADDR = 0xc0, OP_OR_LONG_2ADDR = 0xc1, OP_XOR_LONG_2ADDR = 0xc2, OP_SHL_LONG_2ADDR = 0xc3, OP_SHR_LONG_2ADDR = 0xc4, OP_USHR_LONG_2ADDR = 0xc5, OP_ADD_FLOAT_2ADDR = 0xc6, OP_SUB_FLOAT_2ADDR = 0xc7, OP_MUL_FLOAT_2ADDR = 0xc8, OP_DIV_FLOAT_2ADDR = 0xc9, OP_REM_FLOAT_2ADDR = 0xca, OP_ADD_DOUBLE_2ADDR = 0xcb, OP_SUB_DOUBLE_2ADDR = 0xcc, OP_MUL_DOUBLE_2ADDR = 0xcd, OP_DIV_DOUBLE_2ADDR = 0xce, OP_REM_DOUBLE_2ADDR = 0xcf, OP_ADD_INT_LIT16 = 0xd0, OP_RSUB_INT = 0xd1, OP_MUL_INT_LIT16 = 0xd2, OP_DIV_INT_LIT16 = 0xd3, OP_REM_INT_LIT16 = 0xd4, OP_AND_INT_LIT16 = 0xd5, OP_OR_INT_LIT16 = 0xd6, OP_XOR_INT_LIT16 = 0xd7, OP_ADD_INT_LIT8 = 0xd8, OP_RSUB_INT_LIT8 = 0xd9, OP_MUL_INT_LIT8 = 0xda, OP_DIV_INT_LIT8 = 0xdb, OP_REM_INT_LIT8 = 0xdc, OP_AND_INT_LIT8 = 0xdd, OP_OR_INT_LIT8 = 0xde, OP_XOR_INT_LIT8 = 0xdf, OP_SHL_INT_LIT8 = 0xe0, OP_SHR_INT_LIT8 = 0xe1, OP_USHR_INT_LIT8 = 0xe2, OP_IGET_VOLATILE = 0xe3, OP_IPUT_VOLATILE = 0xe4, OP_SGET_VOLATILE = 0xe5, OP_SPUT_VOLATILE = 0xe6, OP_IGET_OBJECT_VOLATILE = 0xe7, OP_IGET_WIDE_VOLATILE = 0xe8, OP_IPUT_WIDE_VOLATILE = 0xe9, OP_SGET_WIDE_VOLATILE = 0xea, OP_SPUT_WIDE_VOLATILE = 0xeb, OP_BREAKPOINT = 0xec, OP_THROW_VERIFICATION_ERROR = 0xed, OP_EXECUTE_INLINE = 0xee, OP_EXECUTE_INLINE_RANGE = 0xef, OP_INVOKE_OBJECT_INIT_RANGE = 0xf0, OP_RETURN_VOID_BARRIER = 0xf1, OP_IGET_QUICK = 0xf2, OP_IGET_WIDE_QUICK = 0xf3, OP_IGET_OBJECT_QUICK = 0xf4, OP_IPUT_QUICK = 0xf5, OP_IPUT_WIDE_QUICK = 0xf6, OP_IPUT_OBJECT_QUICK = 0xf7, OP_INVOKE_VIRTUAL_QUICK = 0xf8, OP_INVOKE_VIRTUAL_QUICK_RANGE = 0xf9, OP_INVOKE_SUPER_QUICK = 0xfa, OP_INVOKE_SUPER_QUICK_RANGE = 0xfb, OP_IPUT_OBJECT_VOLATILE = 0xfc, OP_SGET_OBJECT_VOLATILE = 0xfd, OP_SPUT_OBJECT_VOLATILE = 0xfe, OP_UNUSED_FF = 0xff, // END(libdex-opcode-enum)}; |
e.g乘法指令集
1 | HANDLE_OP_X_INT_LIT16(OP_MUL_INT_LIT16, "mul", *, 0)<br>OP_END |
1 | #define HANDLE_OP_X_INT_LIT16(_opcode, _opname, _op, _chkdiv) \<br> HANDLE_OPCODE(_opcode /*vA, vB, #+CCCC*/) \<br> vdst = INST_A(inst); \<br> vsrc1 = INST_B(inst); \<br> vsrc2 = FETCH(1); \<br> MY_LOG_VERBOSE("|%s-int/lit16 v%d,v%d,#+0x%04x", \<br> (_opname), vdst, vsrc1, vsrc2); \<br> if (_chkdiv != 0) { \<br> s4 firstVal, result; \<br> firstVal = GET_REGISTER(vsrc1); \<br> if ((s2) vsrc2 == 0) { \<br> EXPORT_PC(); \<br> GOTO_exceptionThrown(); \<br> } \<br> if ((u4)firstVal == 0x80000000 && ((s2) vsrc2) == -1) { \<br> /* won't generate /lit16 instr for this; check anyway */ \<br> if (_chkdiv == 1) \<br> result = firstVal; /* division */ \<br> else \<br> result = 0; /* remainder */ \<br> } else { \<br> result = firstVal _op (s2) vsrc2; \<br> } \<br> SET_REGISTER(vdst, result); \<br> } else { \<br> /* non-div/rem case */ \<br> SET_REGISTER(vdst, GET_REGISTER(vsrc1) _op (s2) vsrc2); \<br> } \<br> FINISH(2); |
（1） 在执行指令时候 找一些资源问题 比如字符串 “dddd” "liumeng" 我的解决方式是自己解析dex 获取资源
1 | char* unLebel(const DexFile *pDexFile,u4 ref){<br> char* unString= (char *) (pDexFile->baseAddr + pDexFile->pStringIds[ref].stringDataOff);<br> int count = 0;<br> int cur = 0;<br> cur = unString[0];<br> while (cur > 0x7f) {<br> count++;<br> cur = unString[count];<br> }<br> int size = ++count;<br> int unStrSize = unString[0] + 1 - size;<br> char *utfStr=(char*)malloc(unStrSize+1);<br> for (int i = 0; i < unStrSize; i++) {<br> utfStr[i] = unString[i + 1];<br> }<br> utfStr[unStrSize] = '\0';<br><br> return utfStr;<br>} |
1 | char* returName= methodToCall->returnName;<br>char* paramName= methodToCall->protoName;<br>strcat(paramName,returName);<br>jmethodID methodID = env->GetStaticMethodID(appClass, methodToCall->methodName, paramName);<br>MY_LOG_INFO("[static] start");<br>free(paramName);<br>free(methodToCall->methodName);<br>if(returName[0]=='Z') {<br> jboolean resultBoolean=env->CallStaticBooleanMethod(appClass,methodID,outs[0],outs[1],outs[2],outs[3],outs[4]);<br> MY_LOG_INFO("------CallStaticBooleanMethod");<br> retval.i=resultBoolean;<br>} |
（3）java关键字解析 synchronized
[培训]传播安全知识、拓宽行业人脉——看雪讲师团队等你加入！
最后于 2018-12-29 15:15
被liumengde编辑
，原因：
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jiangwei的这个 https://blog.csdn.net/jiangwei0910410003/article/details/78070610 是把smali抽出来修改。楼主这个是把smali代码native化。 |
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好吧 又重新看了一遍 |
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问题问的好，这一次虽然贴的代码格式不好，但可以起到指点的作用，作者写的很简洁，中心思想和明了，可以直接看vmp.txt,就是实现dex抽取指令和实现native去解析，一种直接反射调用(GetStaticMethodID)，第二种就是相当于自己实现内部解析方法，另外还说了资源的查找问题，字符串 “dddd” "liumeng" 解决方式是自己解析dex，获取资源，可见作者课下做了苦功，并且实现，一语中的，只是代码贴的有些仓促 起到点化的作用也未尝不可， 另外第一次可以鼓励新人发帖，还望谅解，优秀是肯定的，现在适当放宽了优秀贴的限制，鼓励新人的加入和分享，但必须说优秀贴也有质量高低的，但唯一不变的是精华贴的审核也会更加严格，请放心即可。 另外贴一下优秀的标准即可参考： 1.发帖者本人原创，转载的一律不设； 2.文章没达到精华要求，但有一定的保存价值，或文章不错，但内容太过简短，设优秀。 3.程序源码可以设优秀； 4.优秀或有价值的工具，可以设优秀。 |
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哎。。没想到版主这么心平气和的回了... 他贴的代码，没有任何一段是他原创的，都是android的dvm相关的系统代码，他这样做我都怀疑他自己有没有实现出来过，另外他这个是在讲android的系统源码，而不是讲加固。 毫不夸张的说，要是按照这些代码把解析opcode给编译出来，就相当于自己编译了一个libdvm.so出来，能不能用还是两回说... 我看到vmp的标题而且还加了优了，本来抱着某种期待，点进来看，但是看完了发现居然没有一段代码是他自己原创的，还打着原创的旗号...我真的有一种有被人喂了屎的气愤。。 希望浮华之人能少一点吧。 |
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dexvmp 的基本原理很多人都知道，实现起来这里面坑不少呢，基于 JNI 实现的 vmp 还是有别与 dalvik/art 的原生实现。JNI 是 java 特性，不是 android 特有，如果能实现这样的 vmp 不仅可以保护 android 上的 dex，还可以保护 pc 上的 java程序，android 上 sdk 的加固就和 pc 上的 jar 差不多 |
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<无>把我删了当没来过
最后于 2019-7-5 17:43
被YoHooo编辑
，原因：
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YoHooo
