mirror of
https://github.com/CrazyRedMachine/popnhax.git
synced 2024-11-23 22:00:57 +01:00
343 lines
11 KiB
C++
343 lines
11 KiB
C++
// clang-format off
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#include <windows.h>
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#include <psapi.h>
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// clang-format on
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#include "util/log.h"
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#include "libdisasm/libdis.h"
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#include "patch.h"
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#define LINE_SIZE 512
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#define NO_OF_CHARS 256
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// A utility function to get maximum of two integers
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static int max(int a, int b) {
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return (a > b) ? a : b;
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}
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// The preprocessing function for Boyer Moore's bad character heuristic
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static void badCharHeuristic(const unsigned char *str, int size, int* badchar, bool wildcards) {
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int i;
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// Initialize all occurrences as -1
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for (i = 0; i < NO_OF_CHARS; i++)
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badchar[i] = -1;
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// Fill the actual value of last occurrence of a character
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if (wildcards)
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{
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int lastwildcard = -1;
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for (i = 0; i < size; i++)
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{
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if (str[i] != '?')
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badchar[(int) str[i]] = i;
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else
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lastwildcard = i;
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}
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for (i = 0; i < NO_OF_CHARS; i++)
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{
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if ( badchar[i] < lastwildcard )
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badchar[i] = lastwildcard;
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}
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} else {
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for (i = 0; i < size; i++)
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badchar[(int) str[i]] = i;
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}
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}
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#define DEBUG_SEARCH 0
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int _search_ex(unsigned char *haystack, size_t haystack_size, const unsigned char *needle, size_t needle_size, int orig_offset, bool wildcards, int debug) {
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int badchar[NO_OF_CHARS];
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badCharHeuristic(needle, needle_size, badchar, wildcards);
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int64_t s = 0; // s is shift of the pattern with respect to text
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while (s <= (haystack_size - needle_size)) {
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int j = needle_size - 1;
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if (debug == 2)
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{
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LOG("--------------------------------\n");
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LOG("txt...");
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for (size_t i = 0; i < needle_size; i++)
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{
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LOG("%02x ", haystack[orig_offset+s+i]);
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}
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LOG("\n");
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LOG("pat...");
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for (size_t i = 0; i < needle_size; i++)
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{
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if (wildcards && needle[i] == '?')
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LOG("** ");
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else
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LOG("%02x ", needle[i]);
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}
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LOG("\n");
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}
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if ( wildcards )
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{
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while (j >= 0 && ( needle[j] == '?' || needle[j] == haystack[orig_offset + s + j]) )
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j--;
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} else {
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while (j >= 0 && ( needle[j] == haystack[orig_offset + s + j]) )
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j--;
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}
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if (j < 0) {
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if (debug)
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LOG("found string at offset %llx!\n", orig_offset +s);
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return orig_offset + s;
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}
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else
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{
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s += max(1, j - badchar[(int)haystack[orig_offset + s + j]]);
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if (debug)
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LOG("mismatch at pos %d, new offset %llx\n\n", j, orig_offset+s);
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}
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}
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return -1;
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}
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int search(char *haystack, size_t haystack_size, const char *needle, size_t needle_size, size_t orig_offset) {
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int res = _search_ex((unsigned char*) haystack, haystack_size, (const unsigned char *)needle, needle_size, orig_offset, false, 0);
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return res;
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}
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int wildcard_search(char *haystack, size_t haystack_size, const char *needle, size_t needle_size, size_t orig_offset) {
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int res = _search_ex((unsigned char*) haystack, haystack_size, (const unsigned char *)needle, needle_size, orig_offset, true, 0);
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return res;
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}
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int search_debug(char *haystack, size_t haystack_size, const char *needle, size_t needle_size, size_t orig_offset) {
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int res = _search_ex((unsigned char*) haystack, haystack_size, (const unsigned char *)needle, needle_size, orig_offset, false, 2);
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return res;
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}
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int wildcard_search_debug(char *haystack, size_t haystack_size, const char *needle, size_t needle_size, size_t orig_offset) {
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int res = _search_ex((unsigned char*) haystack, haystack_size, (const unsigned char *)needle, needle_size, orig_offset, true, 2);
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return res;
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}
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void patch_memory(uint64_t patch_addr, char *data, size_t len) {
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DWORD old_prot;
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VirtualProtect((LPVOID)patch_addr, len, PAGE_EXECUTE_READWRITE, &old_prot);
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memcpy((LPVOID)patch_addr, data, len);
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VirtualProtect((LPVOID)patch_addr, len, old_prot, &old_prot);
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}
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char *getDllData(const char *dllFilename, DWORD *dllSize) {
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HMODULE _moduleBase = GetModuleHandle(dllFilename);
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MODULEINFO module_info;
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memset(&module_info, 0, sizeof(module_info));
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if (!GetModuleInformation(GetCurrentProcess(), _moduleBase, &module_info,
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sizeof(module_info))) {
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return NULL;
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}
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*dllSize = module_info.SizeOfImage;
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return (char *)module_info.lpBaseOfDll;
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}
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bool rva_to_offset(const char *dllFilename, uint32_t rva, uint32_t *offset)
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{
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uintptr_t baseAddr = (uintptr_t)GetModuleHandle(dllFilename);
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IMAGE_DOS_HEADER * pDosHdr = (IMAGE_DOS_HEADER *) baseAddr;
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IMAGE_NT_HEADERS * pNtHdr = (IMAGE_NT_HEADERS *) (baseAddr + pDosHdr->e_lfanew);
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int i;
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WORD wSections;
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PIMAGE_SECTION_HEADER pSectionHdr;
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pSectionHdr = IMAGE_FIRST_SECTION(pNtHdr);
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wSections = pNtHdr -> FileHeader.NumberOfSections;
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for (i = 0; i < wSections; i++)
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{
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if (pSectionHdr -> VirtualAddress <= rva)
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if ((pSectionHdr -> VirtualAddress + pSectionHdr -> Misc.VirtualSize) > rva)
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{
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rva -= pSectionHdr -> VirtualAddress;
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rva += pSectionHdr -> PointerToRawData;
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*offset = rva;
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return true;
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}
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pSectionHdr++;
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}
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return false;
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}
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bool offset_to_rva(const char *dllFilename, uint32_t offset, uint32_t *rva)
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{
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uintptr_t baseAddr = (uintptr_t)GetModuleHandle(dllFilename);
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IMAGE_DOS_HEADER * pDosHdr = (IMAGE_DOS_HEADER *) baseAddr;
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IMAGE_NT_HEADERS * pNtHdr = (IMAGE_NT_HEADERS *) (baseAddr + pDosHdr->e_lfanew);
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int i;
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WORD wSections;
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PIMAGE_SECTION_HEADER pSectionHdr;
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pSectionHdr = IMAGE_FIRST_SECTION(pNtHdr);
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wSections = pNtHdr -> FileHeader.NumberOfSections;
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for (i = 0; i < wSections; i++) {
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if (pSectionHdr -> PointerToRawData <= offset)
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if ((pSectionHdr -> PointerToRawData + pSectionHdr -> SizeOfRawData) > offset) {
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offset -= pSectionHdr -> PointerToRawData;
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offset += pSectionHdr -> VirtualAddress;
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*rva = offset;
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return true;
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}
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pSectionHdr++;
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}
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return false;
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}
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void find_and_patch_string(const char *dllFilename, const char *input_string, const char *new_string) {
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DWORD dllSize = 0;
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char *data = getDllData(dllFilename, &dllSize);
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while (1) {
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int64_t pattern_offset = _search(data, dllSize, input_string, strlen(input_string), 0);
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if (pattern_offset == -1) {
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break;
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}
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uint64_t patch_addr = (int64_t)data + pattern_offset;
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char *new_string_buff = (char*)calloc(strlen(new_string) + 1, sizeof(char));
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memcpy(new_string_buff, new_string, strlen(new_string));
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patch_memory(patch_addr, new_string_buff, strlen(new_string) + 1);
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free(new_string_buff);
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}
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}
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int64_t find_and_patch_hex(const char *dllFilename, const char *find, uint8_t find_size, int64_t shift, const char *replace, uint8_t replace_size) {
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DWORD dllSize = 0;
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char *data = getDllData(dllFilename, &dllSize);
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int64_t pattern_offset = _search(data, dllSize, find, find_size, 0);
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if (pattern_offset == -1) {
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return 0;
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}
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#if DEBUG == 1
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LOG("BEFORE PATCH :\n");
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uint8_t *offset = (uint8_t *) ((int64_t)data + pattern_offset + shift - 5);
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for (int i=0; i<32; i++)
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{
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LOG("%02x ", *offset);
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offset++;
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if (i == 15)
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LOG("\n");
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}
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#endif
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uint64_t patch_addr = (int64_t)data + pattern_offset + shift;
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patch_memory(patch_addr, (char *)replace, replace_size);
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#if DEBUG == 1
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LOG("\nAFTER PATCH :\n");
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offset = (uint8_t *) ((int64_t)data + pattern_offset + shift - 5);
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for (int i=0; i<32; i++)
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{
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LOG("%02x ", *offset);
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offset++;
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if (i == 15)
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LOG("\n");
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}
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#endif
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return pattern_offset;
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}
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void log_cb(x86_insn_t *insn, void *arg)
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{
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char line[LINE_SIZE]; /* buffer of line to print */
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x86_format_insn(insn, line, LINE_SIZE, intel_syntax);
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LOG("%s\n", line);
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}
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MH_STATUS WINAPI patch_debug_MH_CreateHook(LPVOID patch_addr, LPVOID hook_function, LPVOID* real_function){
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LOG("--- hooking function over this code ---\n");
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x86_init(opt_none, NULL, NULL);
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x86_disasm_range( (unsigned char *)patch_addr, 0, 0, 50, log_cb, NULL );
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/*
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int size = x86_disasm((unsigned char*)buf, dllSize, 0, ((uint32_t)(hook_addrs[i])-(uint32_t)buf+delta), &insn);
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if ( size ) {
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x86_format_insn(&insn, line, LINE_SIZE, intel_syntax);
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membuf_printf(membuf, "\t\t<!-- %s -->\n", line);
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x86_oplist_free(&insn);
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}
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*/
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x86_cleanup();
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LOG("------\n");
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return MH_CreateHook(patch_addr, hook_function, real_function);
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}
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int patch_debug_search(char *haystack, size_t haystack_size, const char *needle, size_t needle_size, size_t orig_offset)
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{
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LOG("--- Looking for pattern ");
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for (size_t i = 0; i<needle_size; i++)
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{
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LOG("\\x%.02X", (unsigned char)needle[i]);
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}
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LOG("---\n");
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int found = search(haystack, haystack_size, needle, needle_size, orig_offset);
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if ( found != -1 )
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{
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LOG("--- found pattern at this code ---\n");
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x86_init(opt_none, NULL, NULL);
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x86_disasm_range( (unsigned char*)(haystack+found), 0, 0, 50, log_cb, NULL );
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x86_cleanup();
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LOG("------\n");
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}
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else
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{
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LOG("--- pattern not found ---\n");
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}
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return found;
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}
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int patch_debug_wildcard_search(char *haystack, size_t haystack_size, const char *needle, size_t needle_size, size_t orig_offset)
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{
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LOG("--- Looking for wildcard pattern ");
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for (size_t i = 0; i<needle_size; i++)
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{
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LOG("\\x%.02X", (unsigned char)needle[i]);
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}
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LOG("---\n");
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int found = wildcard_search(haystack, haystack_size, needle, needle_size, orig_offset);
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if ( found != -1 )
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{
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LOG("--- found wildcard pattern at this code ---\n");
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x86_init(opt_none, NULL, NULL);
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x86_disasm_range((unsigned char*)(haystack+found), 0, 0, 50, log_cb, NULL );
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x86_cleanup();
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LOG("\n");
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}
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else
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{
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LOG("--- wildcard pattern not found ---\n");
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}
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return found;
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}
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fn_search _search = search;
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fn_wildcard_search _wildcard_search = wildcard_search;
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fn_MH_CreateHook _MH_CreateHook = MH_CreateHook;
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void enable_extended_debug()
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{
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_search = patch_debug_search;
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_wildcard_search = patch_debug_wildcard_search;
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_MH_CreateHook = patch_debug_MH_CreateHook;
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}
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