-/* JocStrap - Java/Objective-C Bootstrap
- * Copyright (C) 2007 Jay Freeman (saurik)
+/* ldid - (Mach-O) Link-Loader Identity Editor
+ * Copyright (C) 2007-2010 Jay Freeman (saurik)
*/
/*
#define MH_MAGIC 0xfeedface
#define MH_CIGAM 0xcefaedfe
+#define MH_MAGIC_64 0xfeedfacf
+#define MH_CIGAM_64 0xcffaedfe
+
+#define MH_DYLDLINK 0x4
+
#define MH_EXECUTE 0x2
#define MH_DYLIB 0x6
#define MH_BUNDLE 0x8
uint32_t cmdsize;
} _packed;
-#define LC_REQ_DYLD 0x80000000
+#define LC_REQ_DYLD uint32_t(0x80000000)
-#define LC_LOAD_DYLIB 0x0c
-#define LC_ID_DYLIB 0x0d
-#define LC_UUID 0x1b
-#define LC_CODE_SIGNATURE 0x1d
-#define LC_REEXPORT_DYLIB (0x1f | LC_REQ_DYLD)
+#define LC_SEGMENT uint32_t(0x01)
+#define LC_LOAD_DYLIB uint32_t(0x0c)
+#define LC_ID_DYLIB uint32_t(0x0d)
+#define LC_UUID uint32_t(0x1b)
+#define LC_CODE_SIGNATURE uint32_t(0x1d)
+#define LC_REEXPORT_DYLIB uint32_t(0x1f | LC_REQ_DYLD)
struct dylib {
uint32_t name;
uint8_t uuid[16];
} _packed;
+struct segment_command {
+ uint32_t cmd;
+ uint32_t cmdsize;
+ char segname[16];
+ uint32_t vmaddr;
+ uint32_t vmsize;
+ uint32_t fileoff;
+ uint32_t filesize;
+ uint32_t maxprot;
+ uint32_t initprot;
+ uint32_t nsects;
+ uint32_t flags;
+};
+
+struct section {
+ char sectname[16];
+ char segname[16];
+ uint32_t addr;
+ uint32_t size;
+ uint32_t offset;
+ uint32_t align;
+ uint32_t reloff;
+ uint32_t nreloc;
+ uint32_t flags;
+ uint32_t reserved1;
+ uint32_t reserved2;
+};
+
struct linkedit_data_command {
uint32_t cmd;
uint32_t cmdsize;
return Swap_(static_cast<uint32_t>(value));
}
+bool little_(true);
+
uint16_t Swap(uint16_t value) {
- return true ? Swap_(value) : value;
+ return little_ ? Swap_(value) : value;
}
uint32_t Swap(uint32_t value) {
- return true ? Swap_(value) : value;
+ return little_ ? Swap_(value) : value;
}
int16_t Swap(int16_t value) {
return Swap(static_cast<uint32_t>(value));
}
+template <typename Target_>
+class Pointer;
+
class Framework {
private:
void *base_;
size_t size_;
- mach_header *mach_header_;
+
+ struct mach_header *mach_header_;
+ struct load_command *load_command_;
+
bool swapped_;
+ bool bits64_;
public:
uint16_t Swap(uint16_t value) const {
}
found:
- if (Swap(mach_header_->magic) == MH_CIGAM)
- swapped_ = !swapped_;
- else _assert(Swap(mach_header_->magic) == MH_MAGIC);
+ switch (Swap(mach_header_->magic)) {
+ case MH_CIGAM:
+ swapped_ = !swapped_;
+ case MH_MAGIC:
+ bits64_ = false;
+ break;
+
+ case MH_CIGAM_64:
+ swapped_ = !swapped_;
+ case MH_MAGIC_64:
+ bits64_ = true;
+ break;
+
+ default:
+ _assert(false);
+ }
+
+ void *post = mach_header_ + 1;
+ if (bits64_)
+ post = (uint32_t *) post + 1;
+ load_command_ = (struct load_command *) post;
_assert(
Swap(mach_header_->filetype) == MH_EXECUTE ||
return base_;
}
- size_t GetSize() {
+ size_t GetSize() const {
return size_;
}
+ uint32_t GetCPUType() const {
+ return Swap(mach_header_->cputype);
+ }
+
+ uint16_t GetCPUSubtype() const {
+ return Swap(mach_header_->cpusubtype) & 0xff;
+ }
+
std::vector<struct load_command *> GetLoadCommands() {
std::vector<struct load_command *> load_commands;
- struct load_command *load_command = reinterpret_cast<struct load_command *>(mach_header_ + 1);
+ struct load_command *load_command = load_command_;
for (uint32_t cmd = 0; cmd != Swap(mach_header_->ncmds); ++cmd) {
load_commands.push_back(load_command);
load_command = (struct load_command *) ((uint8_t *) load_command + Swap(load_command->cmdsize));
return load_commands;
}
+
+ std::vector<segment_command *> GetSegments(const char *segment_name) {
+ std::vector<struct segment_command *> segment_commands;
+
+ _foreach (load_command, GetLoadCommands())
+ if (Swap((*load_command)->cmd) == LC_SEGMENT) {
+ segment_command *segment_command = reinterpret_cast<struct segment_command *>(*load_command);
+ if (strncmp(segment_command->segname, segment_name, 16) == 0)
+ segment_commands.push_back(segment_command);
+ }
+
+ return segment_commands;
+ }
+
+ std::vector<section *> GetSections(const char *segment_name, const char *section_name) {
+ std::vector<section *> sections;
+
+ _foreach (segment, GetSegments(segment_name)) {
+ section *section = (struct section *) (*segment + 1);
+
+ uint32_t sect;
+ for (sect = 0; sect != Swap((*segment)->nsects); ++sect) {
+ if (strncmp(section->sectname, section_name, 16) == 0)
+ sections.push_back(section);
+ ++section;
+ }
+ }
+
+ return sections;
+ }
+
+ template <typename Target_>
+ Pointer<Target_> GetPointer(uint32_t address, const char *segment_name = NULL) {
+ load_command *load_command = (struct load_command *) (mach_header_ + 1);
+ uint32_t cmd;
+
+ for (cmd = 0; cmd != Swap(mach_header_->ncmds); ++cmd) {
+ if (Swap(load_command->cmd) == LC_SEGMENT) {
+ segment_command *segment_command = (struct segment_command *) load_command;
+ if (segment_name != NULL && strncmp(segment_command->segname, segment_name, 16) != 0)
+ goto next_command;
+
+ section *sections = (struct section *) (segment_command + 1);
+
+ uint32_t sect;
+ for (sect = 0; sect != Swap(segment_command->nsects); ++sect) {
+ section *section = §ions[sect];
+ //printf("%s %u %p %p %u\n", segment_command->segname, sect, address, section->addr, section->size);
+ if (address >= Swap(section->addr) && address < Swap(section->addr) + Swap(section->size)) {
+ //printf("0x%.8x %s\n", address, segment_command->segname);
+ return Pointer<Target_>(this, reinterpret_cast<Target_ *>(address - Swap(section->addr) + Swap(section->offset) + (char *) mach_header_));
+ }
+ }
+ }
+
+ next_command:
+ load_command = (struct load_command *) ((char *) load_command + Swap(load_command->cmdsize));
+ }
+
+ return Pointer<Target_>(this);
+ }
+
+ template <typename Target_>
+ Pointer<Target_> GetOffset(uint32_t offset) {
+ return Pointer<Target_>(this, reinterpret_cast<Target_ *>(offset + (uint8_t *) mach_header_));
+ }
};
-#define CSMAGIC_CODEDIRECTORY 0xfade0c02
-#define CSMAGIC_EMBEDDED_SIGNATURE 0xfade0cc0
-#define CSMAGIC_ENTITLEMENTS 0xfade7171
+template <typename Target_>
+class Pointer {
+ private:
+ const Framework *framework_;
+ const Target_ *pointer_;
-#define CSSLOT_CODEDIRECTORY 0
-#define CSSLOT_REQUIREMENTS 2
-#define CSSLOT_ENTITLEMENTS 5
+ public:
+ Pointer(const Framework *framework = NULL, const Target_ *pointer = NULL) :
+ framework_(framework),
+ pointer_(pointer)
+ {
+ }
+
+ operator const Target_ *() const {
+ return pointer_;
+ }
+
+ const Target_ *operator ->() const {
+ return pointer_;
+ }
+
+ Pointer<Target_> &operator ++() {
+ ++pointer_;
+ return *this;
+ }
+
+ template <typename Value_>
+ Value_ Swap(Value_ value) {
+ return framework_->Swap(value);
+ }
+};
+
+#define CSMAGIC_CODEDIRECTORY uint32_t(0xfade0c02)
+#define CSMAGIC_EMBEDDED_SIGNATURE uint32_t(0xfade0cc0)
+#define CSMAGIC_ENTITLEMENTS uint32_t(0xfade7171)
+
+#define CSSLOT_CODEDIRECTORY uint32_t(0)
+#define CSSLOT_REQUIREMENTS uint32_t(2)
+#define CSSLOT_ENTITLEMENTS uint32_t(5)
struct BlobIndex {
uint32_t type;
}
int main(int argc, const char *argv[]) {
+ union {
+ uint16_t word;
+ uint8_t byte[2];
+ } endian = {1};
+
+ little_ = endian.byte[0];
+
bool flag_R(false);
bool flag_t(false);
bool flag_p(false);
bool flag_u(false);
+ bool flag_e(false);
bool flag_T(false);
const void *xmld(NULL);
size_t xmls(0);
+ uintptr_t noffset(_not(uintptr_t));
+ uintptr_t woffset(_not(uintptr_t));
+
std::vector<std::string> files;
if (argc == 1) {
fprintf(stderr, "usage: %s -S[entitlements.xml] <binary>\n", argv[0]);
+ fprintf(stderr, " %s -e MobileSafari\n", argv[0]);
fprintf(stderr, " %s -S cat\n", argv[0]);
fprintf(stderr, " %s -Stfp.xml gdb\n", argv[0]);
exit(0);
case 't': flag_t = true; break;
case 'u': flag_u = true; break;
case 'p': flag_p = true; break;
+ case 'e': flag_e = true; break;
case 's':
_assert(!flag_S);
}
} break;
+ case 'n': {
+ char *arge;
+ noffset = strtoul(argv[argi] + 2, &arge, 0);
+ _assert(arge == argv[argi] + strlen(argv[argi]));
+ } break;
+
+ case 'w': {
+ char *arge;
+ woffset = strtoul(argv[argi] + 2, &arge, 0);
+ _assert(arge == argv[argi] + strlen(argv[argi]));
+ } break;
+
default:
goto usage;
break;
const char *path(file->c_str());
const char *base = strrchr(path, '/');
char *temp(NULL), *dir;
- mode_t mode = 0;
if (base != NULL)
dir = strndup_(path, base++ - path + 1);
size_t size = _not(size_t);
const char *arch; {
Framework framework(path);
+ framework->flags = framework.Swap(framework.Swap(framework->flags) | MH_DYLDLINK);
+
_foreach (load_command, framework.GetLoadCommands()) {
uint32_t cmd(framework.Swap((*load_command)->cmd));
if (cmd == LC_CODE_SIGNATURE) {
if (size == _not(size_t))
size = framework.GetSize();
- switch (framework->cputype) {
- case 12: switch (framework->cpusubtype) {
+ switch (framework.GetCPUType()) {
+ case 7: switch (framework.GetCPUSubtype()) {
+ case 3: arch = "i386"; break;
+ default: arch = NULL; break;
+ } break;
+
+ case 12: switch (framework.GetCPUSubtype()) {
case 0: arch = "arm"; break;
case 6: arch = "armv6"; break;
+ case 9: arch = "armv7"; break;
+ default: arch = NULL; break;
+ } break;
+
+ case 18: switch (framework.GetCPUSubtype()) {
+ case 10: arch = "ppc7400"; break;
+ default: arch = NULL; break;
+ } break;
+
+ case 16777223: switch (framework.GetCPUSubtype()) {
+ case 3: arch = "x86_64"; break;
+ default: arch = NULL; break;
+ } break;
+
+ case 16777234: switch (framework.GetCPUSubtype()) {
+ case 0: arch = "ppc64"; break;
default: arch = NULL; break;
} break;
if (flag_p)
printf("path%zu='%s'\n", filei, file->c_str());
+ if (woffset != _not(uintptr_t)) {
+ Pointer<uint32_t> wvalue(framework.GetPointer<uint32_t>(woffset));
+ if (wvalue == NULL)
+ printf("(null) %p\n", reinterpret_cast<void *>(woffset));
+ else
+ printf("0x%.08x\n", *wvalue);
+ }
+
+ if (noffset != _not(uintptr_t))
+ printf("%s\n", &*framework.GetPointer<char>(noffset));
+
_foreach (load_command, framework.GetLoadCommands()) {
uint32_t cmd(framework.Swap((*load_command)->cmd));
}
}
+ if (flag_e) {
+ _assert(signature != NULL);
+
+ uint32_t data = framework.Swap(signature->dataoff);
+ uint32_t size = framework.Swap(signature->datasize);
+
+ uint8_t *top = reinterpret_cast<uint8_t *>(framework.GetBase());
+ uint8_t *blob = top + data;
+ struct SuperBlob *super = reinterpret_cast<struct SuperBlob *>(blob);
+
+ for (size_t index(0); index != Swap(super->count); ++index)
+ if (Swap(super->index[index].type) == CSSLOT_ENTITLEMENTS) {
+ uint32_t begin = Swap(super->index[index].offset);
+ struct Blob *entitlements = reinterpret_cast<struct Blob *>(blob + begin);
+ fwrite(entitlements + 1, 1, Swap(entitlements->length) - sizeof(struct Blob), stdout);
+ }
+ }
+
if (flag_s) {
_assert(signature != NULL);
for (size_t i = 0; i != pages - 1; ++i)
sha1(hashes[i], top + 0x1000 * i, 0x1000);
if (pages != 0)
- sha1(hashes[pages - 1], top + 0x1000 * (pages - 1), data % 0x1000);
+ sha1(hashes[pages - 1], top + 0x1000 * (pages - 1), ((data - 1) % 0x1000) + 1);
}
}
offset += sizeof(struct CodeDirectory);
directory->blob.magic = Swap(CSMAGIC_CODEDIRECTORY);
- directory->version = Swap(0x00020001);
- directory->flags = Swap(0);
+ directory->version = Swap(uint32_t(0x00020001));
+ directory->flags = Swap(uint32_t(0));
directory->codeLimit = Swap(data);
directory->hashSize = 0x14;
directory->hashType = 0x01;
directory->spare1 = 0x00;
directory->pageSize = 0x0c;
- directory->spare2 = Swap(0);
+ directory->spare2 = Swap(uint32_t(0));
directory->identOffset = Swap(offset - begin);
strcpy(reinterpret_cast<char *>(blob + offset), base);
for (size_t i = 0; i != pages - 1; ++i)
sha1(hashes[i], top + 0x1000 * i, 0x1000);
if (pages != 0)
- sha1(hashes[pages - 1], top + 0x1000 * (pages - 1), data % 0x1000);
+ sha1(hashes[pages - 1], top + 0x1000 * (pages - 1), ((data - 1) % 0x1000) + 1);
directory->hashOffset = Swap(offset - begin);
offset += sizeof(*hashes) * pages;
super->blob.length = Swap(offset);
if (offset > size) {
- fprintf(stderr, "offset (%zu) > size (%zu)\n", offset, size);
+ fprintf(stderr, "offset (%u) > size (%u)\n", offset, size);
_assert(false);
} //else fprintf(stderr, "offset (%zu) <= size (%zu)\n", offset, size);
memset(blob + offset, 0, size - offset);
}
+ if (flag_S) {
+ uint8_t *top = reinterpret_cast<uint8_t *>(framework.GetBase());
+ size_t size = framework.GetSize();
+
+ char *copy;
+ asprintf(©, "%s.%s.cp", dir, base);
+ FILE *file = fopen(copy, "w+");
+ size_t writ = fwrite(top, 1, size, file);
+ _assert(writ == size);
+ fclose(file);
+
+ _syscall(unlink(temp));
+ free(temp);
+ temp = copy;
+ }
+
if (temp) {
struct stat info;
_syscall(stat(path, &info));
projects / ldid.git / blobdiff