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-rw-r--r--bruiser/bruisercapstone.c247
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diff --git a/bruiser/bruisercapstone.c b/bruiser/bruisercapstone.c
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+
+/***************************************************Project Mutator****************************************************/
+/*first line intentionally left blank.*/
+/*bruiser's capstone side for rewriting xobjects*/
+/*Copyright (C) 2018 Farzad Sadeghi
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.*/
+/**********************************************************************************************************************/
+/**********************************************************************************************************************/
+#include "./bruisercapstone.h"
+#include "./devi_extra.h"
+#include <capstone/capstone.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <keystone/keystone.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+/**********************************************************************************************************************/
+/**********************************************************************************************************************/
+extern char etext, edata, end;
+// quad
+#define CODE_1 "\x55\x48\x89\xe5\x48\x83\xec\x20\x89\x7d\xfc\x89\x75\xf8\x89\x55\xf4\x89\x4d\xf0\x8b\x7d\xfc\x8b\x75\xf8\xe8\xd1\xfd\xff\xff\x8b\x7d\xf4\x8b\x75\xf0\x89\x45\xec\xe8\xc3\xfd\xff\xff\x8b\x4d\xec\x1\xc1\x89\xc8\x48\x83\xc4\x20\x5d\xc3"
+// glob
+#define CODE_2 "\x55\x48\x89\xe5\x48\x8b\x05\x0d\x15\x20\x00\x48\x8b\x0d\xee\x14\x20\x00\x48\x8b\x15\xf7\x14\x20\x00\x48\x8b\x35\xd8\x14\x20\x00\x8b\x3e\x03\x3a\x03\x39\x03\x38\x89\xf8\x5d\xc3"
+/**********************************************************************************************************************/
+/**********************************************************************************************************************/
+uint32_t get_textsection_length(void) {return &edata-&etext;}
+/**********************************************************************************************************************/
+/**********************************************************************************************************************/
+uintptr_t get_symbol_rt_address(const char* symbol_name) {}
+/**********************************************************************************************************************/
+/**********************************************************************************************************************/
+void int2byte(int value, uint8_t* ret_value, size_t size) {
+ for (int i = 0; i < size; ++i) {
+ ret_value[i] = (value & (0xff << (8*i))) >> (8*i);
+ }
+}
+/**********************************************************************************************************************/
+/**********************************************************************************************************************/
+void leb128_encode_s(int32_t value, uint8_t* ret_value, size_t size) {
+ uint8_t dummy;
+ if (value == 0) {for (int i = 0; i < size; ++i) ret_value[i] = 0;}
+ for (int i = 0; i < size; ++i) {
+ dummy = value & 0x7f;
+ ret_value[i] = dummy | 0x80;
+ value >>=7;
+ if (((value == 0) && ((dummy & 0x40) == 0)) || ((value == -1) && (dummy & 0x40))) {
+ ret_value[size - 1] ^= 0x80;
+ break;
+ }
+ }
+}
+/**********************************************************************************************************************/
+/**********************************************************************************************************************/
+void leb128_encode_u(uint32_t value, uint8_t* ret_value, size_t size) {
+ uint8_t dummy;
+ if (value == 0) {for (int i = 0; i < size; ++i) ret_value[i] = 0;}
+ for (int i = 0; i < size; ++i) {
+ dummy = value & 0x7f;
+ ret_value[i] = dummy | 0x80;
+ value >>=7;
+ }
+ ret_value[size - 1] ^= 0x80;
+}
+/**********************************************************************************************************************/
+/**********************************************************************************************************************/
+void leb128_decode_s(int32_t value, uint8_t* ret_value, size_t size) {}
+/**********************************************************************************************************************/
+/**********************************************************************************************************************/
+void leb128_decode_u(uint32_t value, uint8_t* ret_value, size_t size) {}
+/**********************************************************************************************************************/
+/**********************************************************************************************************************/
+int ks_write(ks_arch arch, int mode, const char* assembly, int syntax, unsigned char* encode) {
+ ks_engine* ks;
+ ks_err err = KS_ERR_ARCH;
+ size_t count;
+ size_t size;
+
+ err = ks_open(arch, mode, &ks);
+ if (err != KS_ERR_OK) {printf("failed on ks_open().\n"); return -1;}
+ if (syntax) ks_option(ks, KS_OPT_SYNTAX, syntax);
+
+ if (ks_asm(ks, assembly, 0, &encode, &size, &count)) {printf("errored out\n"); return -1;}
+#if 0
+ else {
+ printf("%s =", assembly);
+ for (size_t i = 0; i < size; ++i) {
+ printf("%02x ", encode[i]);
+ }
+ printf("\n");
+ }
+#endif
+
+ ks_close(ks);
+ return size;
+}
+/**********************************************************************************************************************/
+/**********************************************************************************************************************/
+int global_rewriter(int offset, size_t size, uint8_t* asm_code, const char* obj) {
+ csh handle;
+ cs_insn* insn;
+ size_t count;
+ uint8_t code[16];
+ size_t size_counter = 0;
+ unsigned char *encode;
+
+ if (cs_open(CS_ARCH_X86, CS_MODE_64, &handle) != CS_ERR_OK) return -1;
+ count = cs_disasm(handle, obj, size, 0x0, 0, &insn);
+ printf("number of instructions: %d.\n\n", count);
+ cs_option(handle, CS_OPT_DETAIL, CS_OPT_ON);
+
+ if (count > 0) {
+ size_t j;
+ for (j = 0; j < count; ++j) {
+ printf(CYAN"%d.\t"NORMAL, j);
+ printf(GREEN"0x%"PRIx64":\t%s\t\t%s\t"NORMAL, insn[j].address, insn[j].mnemonic, insn[j].op_str);
+ printf(BLUE"insn size: %d\n"NORMAL, insn[j].size);
+ //for (int i = 0; i < 16; ++i) {code[i] = insn[j].bytes[i]; printf("%02x ", code[i]);}
+ //printf("\n");
+
+ if (strcmp(insn[j].mnemonic, "mov") == 0) {
+ }
+
+ for (int i = 0; i < insn[j].size; ++i) {
+ asm_code[size_counter] = insn[j].bytes[i];
+ size_counter++;
+ }
+ }
+
+ cs_free(insn, count);
+ } else {
+ printf("ERROR!!!\n");
+ }
+ cs_close(&handle);
+ return size_counter;
+}
+/**********************************************************************************************************************/
+/**********************************************************************************************************************/
+int call_rewriter(int offset, size_t size, uint8_t* asm_code, const char* obj) {
+ csh handle;
+ cs_insn* insn;
+ size_t count;
+ uint8_t rewritten[16];
+ uint8_t code[16];
+ size_t size_counter = 0;
+
+ if (cs_open(CS_ARCH_X86, CS_MODE_64, &handle) != CS_ERR_OK) return -1;
+ count = cs_disasm(handle, obj, size, 0x0, 0, &insn);
+ printf("number of instructions: %d.\n\n", count);
+ cs_option(handle, CS_OPT_DETAIL, CS_OPT_ON);
+
+ if (count > 0) {
+ size_t j;
+ for (j = 0; j < count; ++j) {
+ printf(CYAN"%d.\t"NORMAL, j);
+ printf(GREEN"0x%"PRIx64":\t%s""\t\t%s\t"NORMAL, insn[j].address, insn[j].mnemonic, insn[j].op_str);
+ for (int i = 0; i < 16; ++i) {code[i] = insn[j].bytes[i]; printf(BLUE"%02x "NORMAL, code[i]);}
+ printf("\n");
+
+ if (strcmp(insn[j].mnemonic, "call") == 0) {
+ char* endptr;
+ intmax_t address = strtoimax(insn[j].op_str, &endptr, 0);
+ uintmax_t uaddress = strtoumax(insn[j].op_str, &endptr, 0);
+ // rewriting
+ asm_code[size_counter] = 0xe8, size_counter++;
+ uint8_t temp[4];
+ //@DEVI-call cant be the last instructino in a function
+ int2byte(offset + insn[j].address, temp, 4);
+ for (int i = 0; i < 4; ++i) {asm_code[size_counter] = temp[i]; size_counter++;}
+ continue;
+ }
+ for (int i = 0; i < insn[j].size; ++i) {
+ asm_code[size_counter] = insn[j].bytes[i];
+ size_counter++;
+ }
+ }
+
+ cs_free(insn, count);
+ } else {
+ printf("ERROR!!!\n");
+ }
+ cs_close(&handle);
+ return size_counter;
+}
+/**********************************************************************************************************************/
+/**********************************************************************************************************************/
+// @DEVI-the following lines are only meant for testing.
+#pragma weak main
+int main(int argc, char** argv) {
+ uint8_t asm_code[58];
+ uint8_t asm_code2[44];
+ printf("----------------------------------------------------------\n");
+ printf("call_rewriter:\n");
+ int new_size = call_rewriter(-528, 58, asm_code, CODE_1);
+ printf("new size is %d.\n", new_size);
+ for (int i = new_size; i < 58; ++i) {asm_code[i] = 0;}
+ for (int i = 0; i < 58; ++i) {printf("%02x ", asm_code[i]);}
+
+ printf("\n----------------------------------------------------------\n");
+ printf("global_rewriter:\n");
+ new_size = global_rewriter(-528, 44, asm_code2, CODE_2);
+ printf("new size is %d.\n", new_size);
+ for (int i = new_size; i < 44; ++i) {asm_code2[i] = 0;}
+ for (int i = 0; i < 44; ++i) {printf("%02x ", asm_code2[i]);}
+
+ printf("\n----------------------------------------------------------\n");
+ printf("etext: %10p\n", &etext);
+ printf("edata: %10p\n", &edata);
+ printf("end: %10p\n", &end);
+ printf("text section length: %d\n", get_textsection_length());
+
+ printf("----------------------------------------------------------\n");
+ uint8_t value[4];
+ int2byte(-528, value, 4);
+ for (int i = 0; i < 4; ++i) {printf("%02x ", value[i]);}
+ printf("\n");
+ leb128_encode_u(528, value, 4);
+ for (int i = 0; i < 4; ++i) {printf("%02x ", value[i]);}
+ printf("\n");
+ leb128_encode_s(-528, value, 4);
+ for (int i = 0; i < 4; ++i) {printf("%02x ", value[i]);}
+ printf("\n");
+ printf("----------------------------------------------------------\n");
+
+ unsigned char* encode;
+ ks_write(KS_ARCH_X86, KS_MODE_64, "add rax, rcx", 0, encode);
+ ks_free(encode);
+
+ return 0;
+}
+/**********************************************************************************************************************/
+/*last line intentionally left blank.*/
+
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