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woody-woodpacker
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chore: efl -> elf

This commit is contained in:
gbrochar 2024-04-15 06:17:31 +02:00
parent fa004f3a6a
commit ee6e39f716
3 changed files with 23 additions and 20 deletions
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9
includes/woody.h
View File

@ -22,7 +22,7 @@ typedef struct payload
size_t len; size_t len;
} t_payload; } t_payload;
typedef struct efl_content typedef struct elf_content
{ {
long unsigned int file_size; long unsigned int file_size;
char *file_path; char *file_path;
@ -31,16 +31,17 @@ typedef struct efl_content
Elf64_Phdr *Phdr; Elf64_Phdr *Phdr;
Elf64_Shdr *Shdr; Elf64_Shdr *Shdr;
char *extra_data; char *extra_data;
} t_efl_content; } t_elf_content;
// utils.c // utils.c
void *fetch(char *file, unsigned long file_size, unsigned long offset_to_data, unsigned long supposed_data_size); void *fetch(char *file, unsigned long file_size, unsigned long offset_to_data, unsigned long supposed_data_size);
int ft_put_error(char *str); int ft_put_error(char *str);
// woody.c // woody.c
int prepare_injection(t_efl_content *woody); int prepare_injection(t_elf_content *woody);
// encrypt.c // encrypt.c
void encrypt(char *file, unsigned long int offset, unsigned long int size); void encrypt(char *file, unsigned long int offset, unsigned long int size);
#endif #endif

7
srcs/main.c
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@ -1,6 +1,6 @@
#include "../includes/woody.h" #include "../includes/woody.h"
int get_elf_file(t_efl_content *woody) int get_elf_file(t_elf_content *woody)
{ {
int fd; int fd;
off_t off; off_t off;
@ -32,7 +32,7 @@ int get_elf_file(t_efl_content *woody)
int main(int ac, char **av) int main(int ac, char **av)
{ {
t_efl_content woody; t_elf_content woody;
if (ac != 2) if (ac != 2)
{ {
return ft_put_error("Woody_woodpacker take 1 argument\n"); return ft_put_error("Woody_woodpacker take 1 argument\n");
@ -42,4 +42,5 @@ int main(int ac, char **av)
if (ret == EXIT_FAILURE) if (ret == EXIT_FAILURE)
return ret; return ret;
return prepare_injection(&woody); return prepare_injection(&woody);
} }

27
srcs/woody.c
View File

@ -27,7 +27,7 @@ int save_elf(char *path, char *file, unsigned long int size)
return EXIT_SUCCESS; return EXIT_SUCCESS;
} }
int get_load_segment(t_efl_content *woody, int start, bool executable) int get_load_segment(t_elf_content *woody, int start, bool executable)
{ {
for (int i = start; i < woody->Ehdr->e_phnum; i++) for (int i = start; i < woody->Ehdr->e_phnum; i++)
{ {
@ -45,7 +45,7 @@ int get_load_segment(t_efl_content *woody, int start, bool executable)
return -1; return -1;
} }
void offset_sections(t_efl_content *woody, unsigned int from, unsigned int offset_ammount) void offset_sections(t_elf_content *woody, unsigned int from, unsigned int offset_ammount)
{ {
for (int i = 0; i < woody->Ehdr->e_phnum; i++) for (int i = 0; i < woody->Ehdr->e_phnum; i++)
{ {
@ -59,7 +59,7 @@ void offset_sections(t_efl_content *woody, unsigned int from, unsigned int offse
} }
} }
size_t create_codecave(t_efl_content *woody, Elf64_Phdr *load_segment, t_payload *payload) size_t create_codecave(t_elf_content *woody, Elf64_Phdr *load_segment, t_payload *payload)
{ {
const unsigned int page_size = 4096; // getpagesize(); not authorized const unsigned int page_size = 4096; // getpagesize(); not authorized
unsigned int padding_size = ((payload->len / page_size) + 1) * page_size; unsigned int padding_size = ((payload->len / page_size) + 1) * page_size;
@ -93,12 +93,12 @@ t_payload *get_payload()
return payload; return payload;
} }
int insert_payload(t_efl_content *woody, t_payload *payload, size_t payload_position) int insert_payload(t_elf_content *woody, t_payload *payload, size_t payload_position)
{ {
char *ptr = ft_strnstr_nullterminated(payload->payload, JUMP, payload->len); char *ptr = ft_strnstr_nullterminated(payload->payload, JUMP, payload->len);
if (ptr) if (ptr)
{ {
int32_t jmp_index = ptr - payload->payload; int32_t jmp_index = ptr - payload->payload;
int32_t jump_value = ((payload_position + payload->len) - woody->Ehdr->e_entry) * -1; int32_t jump_value = ((payload_position + payload->len) - woody->Ehdr->e_entry) * -1;
ft_memcpy(&payload->payload[jmp_index + 1], &jump_value, sizeof(jump_value)); ft_memcpy(&payload->payload[jmp_index + 1], &jump_value, sizeof(jump_value));
@ -108,19 +108,19 @@ int insert_payload(t_efl_content *woody, t_payload *payload, size_t payload_posi
printf("Code cave start = %ld (%lx)\n", payload_position, payload_position); printf("Code cave start = %ld (%lx)\n", payload_position, payload_position);
printf("Payload size = %ld (%lx)\n", payload->len, payload->len); printf("Payload size = %ld (%lx)\n", payload->len, payload->len);
printf("Backwar d offset = %d (%x)\n", jump_value, jump_value); printf("Backwar d offset = %d (%x)\n", jump_value, jump_value);
return EXIT_SUCCESS; return EXIT_SUCCESS;
} }
return EXIT_FAILURE; return EXIT_FAILURE;
} }
void inject(t_efl_content *woody) void inject(t_elf_content *woody)
{ {
t_payload *payload = get_payload(); t_payload *payload = get_payload();
int i = get_load_segment(woody, 0, true); int i = get_load_segment(woody, 0, true);
int j = get_load_segment(woody, i + 1, false); int j = get_load_segment(woody, i + 1, false);
size_t code_cave_size = woody->Phdr[j].p_offset - (woody->Phdr[i].p_offset + woody->Phdr[i].p_filesz); size_t code_cave_size = woody->Phdr[j].p_offset - (woody->Phdr[i].p_offset + woody->Phdr[i].p_filesz);
size_t payload_position; size_t payload_position;
printf("load position = : %ld (%lx)\n", woody->Phdr[i].p_offset, woody->Phdr[i].p_offset); printf("load position = : %ld (%lx)\n", woody->Phdr[i].p_offset, woody->Phdr[i].p_offset);
@ -144,7 +144,7 @@ void inject(t_efl_content *woody)
printf("New entry = %ld (%lx)\n", woody->Ehdr->e_entry, woody->Ehdr->e_entry); printf("New entry = %ld (%lx)\n", woody->Ehdr->e_entry, woody->Ehdr->e_entry);
} }
int get_elf_sections(t_efl_content *woody) int get_elf_sections(t_elf_content *woody)
{ {
woody->Ehdr = (Elf64_Ehdr *)fetch(woody->file, woody->file_size, 0, sizeof(Elf64_Ehdr)); woody->Ehdr = (Elf64_Ehdr *)fetch(woody->file, woody->file_size, 0, sizeof(Elf64_Ehdr));
if (!woody->Ehdr || !elf_magic_numbers(woody->file) || woody->Ehdr->e_ident[EI_CLASS] != ELFCLASS64) if (!woody->Ehdr || !elf_magic_numbers(woody->file) || woody->Ehdr->e_ident[EI_CLASS] != ELFCLASS64)
@ -178,7 +178,7 @@ int get_elf_sections(t_efl_content *woody)
// if (Sshstrtab == NULL) // if (Sshstrtab == NULL)
// return ft_put_error("Corrupted file"); // return ft_put_error("Corrupted file");
// Elf64_Shdr *strtab_header = (Elf64_Shdr *)fetch(woody->file, woody->file_size, woody->Ehdr->e_shoff + (symbols_table->sh_link * woody->Ehdr->e_shentsize), sizeof(Elf64_Shdr)); // Elf64_Shdr *strtab_header = (Elf64_Shdr *)fetch(woody->file, woody->file_size, woody->Ehdr->e_shoff + (symbols_table->sh_link * woody->Ehdr->e_shentsize), sizeof(Elf64_Shdr));
// if (!strtab_header) // if (!strtab_header)
// return ft_put_error("Corrupted file"); // return ft_put_error("Corrupted file");
@ -192,7 +192,7 @@ int get_elf_sections(t_efl_content *woody)
return EXIT_SUCCESS; return EXIT_SUCCESS;
} }
int prepare_injection(t_efl_content *woody) int prepare_injection(t_elf_content *woody)
{ {
int elf_statut = get_elf_sections(woody); int elf_statut = get_elf_sections(woody);
if (elf_statut) if (elf_statut)
@ -211,4 +211,5 @@ int prepare_injection(t_efl_content *woody)
save_elf("woody", woody_file, woody->file_size); save_elf("woody", woody_file, woody->file_size);
free(woody_file); free(woody_file);
return EXIT_SUCCESS; return EXIT_SUCCESS;
} }