-/* 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)
*/
/*
*/
#include "minimal/stdlib.h"
+#include "minimal/string.h"
#include "minimal/mapping.h"
#include "sha1.h"
#include <vector>
#include <sys/wait.h>
+#include <sys/types.h>
+#include <sys/stat.h>
struct fat_header {
uint32_t magic;
uint32_t nfat_arch;
-};
+} _packed;
#define FAT_MAGIC 0xcafebabe
#define FAT_CIGAM 0xbebafeca
uint32_t offset;
uint32_t size;
uint32_t align;
-};
+} _packed;
struct mach_header {
uint32_t magic;
uint32_t ncmds;
uint32_t sizeofcmds;
uint32_t flags;
-};
+} _packed;
#define MH_MAGIC 0xfeedface
#define MH_CIGAM 0xcefaedfe
-#define MH_EXECUTE 0x2
-#define MH_DYLIB 0x6
-#define MH_BUNDLE 0x8
+#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
+#define MH_DYLIB_STUB 0x9
struct load_command {
uint32_t cmd;
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;
uint32_t timestamp;
uint32_t current_version;
uint32_t compatibility_version;
-};
+} _packed;
struct dylib_command {
uint32_t cmd;
uint32_t cmdsize;
struct dylib dylib;
-};
+} _packed;
struct uuid_command {
uint32_t cmd;
uint32_t cmdsize;
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 cmdsize;
uint32_t dataoff;
uint32_t datasize;
-};
+} _packed;
uint16_t Swap_(uint16_t value) {
return
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_));
+ }
+};
+
+template <typename Target_>
+class Pointer {
+ private:
+ const Framework *framework_;
+ const Target_ *pointer_;
+
+ 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 0xfade0c02
-#define CSMAGIC_EMBEDDED_SIGNATURE 0xfade0cc0
-#define CSSLOT_CODEDIRECTORY 0
-#define CSSLOT_REQUIREMENTS 2
+#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;
uint32_t offset;
-};
+} _packed;
-struct SuperBlob {
+struct Blob {
uint32_t magic;
uint32_t length;
+} _packed;
+
+struct SuperBlob {
+ struct Blob blob;
uint32_t count;
struct BlobIndex index[];
-};
+} _packed;
struct CodeDirectory {
- uint32_t magic;
- uint32_t length;
+ struct Blob blob;
uint32_t version;
uint32_t flags;
uint32_t hashOffset;
uint8_t spare1;
uint8_t pageSize;
uint32_t spare2;
-};
+} _packed;
extern "C" uint32_t hash(uint8_t *k, uint32_t length, uint32_t initval);
}
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);
+
bool flag_S(false);
+ bool flag_s(false);
bool timeh(false);
uint32_t timev(0);
+ 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;
- _assert(argc != 0);
+ 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);
+ }
+
for (int argi(1); argi != argc; ++argi)
if (argv[argi][0] != '-')
files.push_back(argv[argi]);
case 't': flag_t = true; break;
case 'u': flag_u = true; break;
case 'p': flag_p = true; break;
- case 'S': flag_S = true; break;
+ case 'e': flag_e = true; break;
+
+ case 's':
+ _assert(!flag_S);
+ flag_s = true;
+ break;
+
+ case 'S':
+ _assert(!flag_s);
+ flag_S = true;
+ if (argv[argi][2] != '\0') {
+ const char *xml = argv[argi] + 2;
+ xmld = map(xml, 0, _not(size_t), &xmls, true);
+ }
+ break;
case 'T': {
flag_T = true;
}
} 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;
char *temp(NULL), *dir;
if (base != NULL)
- dir = strndup(path, base++ - path + 1);
+ dir = strndup_(path, base++ - path + 1);
else {
dir = strdup("");
base = path;
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;
_syscall(pid);
if (pid == 0) {
char *ssize;
- asprintf(&ssize, "%u", (sizeof(struct SuperBlob) + 2 * sizeof(struct BlobIndex) + sizeof(struct CodeDirectory) + strlen(base) + 1 + (size + 0x1000 - 1) / 0x1000 * 0x14 + 0xc + 15) / 16 * 16);
+ asprintf(&ssize, "%u", (sizeof(struct SuperBlob) + 2 * sizeof(struct BlobIndex) + sizeof(struct CodeDirectory) + strlen(base) + 1 + ((xmld == NULL ? CSSLOT_REQUIREMENTS : CSSLOT_ENTITLEMENTS) + (size + 0x1000 - 1) / 0x1000) * 0x14 + 0xc + (xmld == NULL ? 0 : 0x10 + xmls) + 15) / 16 * 16);
+ //printf("%s -i %s -a %s %s -o %s\n", allocate, path, arch, ssize, temp);
execlp(allocate, allocate, "-i", path, "-a", arch, ssize, "-o", temp, NULL);
_assert(false);
}
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);
+
+ 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_CODEDIRECTORY) {
+ uint32_t begin = Swap(super->index[index].offset);
+ struct CodeDirectory *directory = reinterpret_cast<struct CodeDirectory *>(blob + begin);
+
+ uint8_t (*hashes)[20] = reinterpret_cast<uint8_t (*)[20]>(blob + begin + Swap(directory->hashOffset));
+ uint32_t pages = Swap(directory->nCodeSlots);
+
+ if (pages != 1)
+ 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 - 1) % 0x1000) + 1);
+ }
+ }
+
if (flag_S) {
_assert(signature != NULL);
uint8_t *top = reinterpret_cast<uint8_t *>(framework.GetBase());
uint8_t *blob = top + data;
struct SuperBlob *super = reinterpret_cast<struct SuperBlob *>(blob);
- super->magic = Swap(CSMAGIC_EMBEDDED_SIGNATURE);
+ super->blob.magic = Swap(CSMAGIC_EMBEDDED_SIGNATURE);
- uint32_t count = 2;
+ uint32_t count = xmld == NULL ? 2 : 3;
uint32_t offset = sizeof(struct SuperBlob) + count * sizeof(struct BlobIndex);
super->index[0].type = Swap(CSSLOT_CODEDIRECTORY);
struct CodeDirectory *directory = reinterpret_cast<struct CodeDirectory *>(blob + begin);
offset += sizeof(struct CodeDirectory);
- directory->magic = Swap(CSMAGIC_CODEDIRECTORY);
- directory->version = Swap(0x00020001);
- directory->flags = Swap(0);
+ directory->blob.magic = Swap(CSMAGIC_CODEDIRECTORY);
+ 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);
offset += strlen(base) + 1;
+ uint32_t special = xmld == NULL ? CSSLOT_REQUIREMENTS : CSSLOT_ENTITLEMENTS;
+ directory->nSpecialSlots = Swap(special);
+
uint8_t (*hashes)[20] = reinterpret_cast<uint8_t (*)[20]>(blob + offset);
- uint32_t special = 0;
+ memset(hashes, 0, sizeof(*hashes) * special);
+
+ offset += sizeof(*hashes) * special;
+ hashes += special;
uint32_t pages = (data + 0x1000 - 1) / 0x1000;
- directory->nSpecialSlots = Swap(special);
directory->nCodeSlots = Swap(pages);
if (pages != 1)
for (size_t i = 0; i != pages - 1; ++i)
- sha1(hashes[special + i], top + 0x1000 * i, 0x1000);
+ sha1(hashes[i], top + 0x1000 * i, 0x1000);
if (pages != 0)
- sha1(hashes[special + 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) * (special + pages);
- directory->length = Swap(offset - begin);
+ offset += sizeof(*hashes) * pages;
+ directory->blob.length = Swap(offset - begin);
super->index[1].type = Swap(CSSLOT_REQUIREMENTS);
super->index[1].offset = Swap(offset);
memcpy(blob + offset, "\xfa\xde\x0c\x01\x00\x00\x00\x0c\x00\x00\x00\x00", 0xc);
offset += 0xc;
+ if (xmld != NULL) {
+ super->index[2].type = Swap(CSSLOT_ENTITLEMENTS);
+ super->index[2].offset = Swap(offset);
+
+ uint32_t begin = offset;
+ struct Blob *entitlements = reinterpret_cast<struct Blob *>(blob + begin);
+ offset += sizeof(struct Blob);
+
+ memcpy(blob + offset, xmld, xmls);
+ offset += xmls;
+
+ entitlements->magic = Swap(CSMAGIC_ENTITLEMENTS);
+ entitlements->length = Swap(offset - begin);
+ }
+
+ for (size_t index(0); index != count; ++index) {
+ uint32_t type = Swap(super->index[index].type);
+ if (type != 0 && type <= special) {
+ uint32_t offset = Swap(super->index[index].offset);
+ struct Blob *local = (struct Blob *) (blob + offset);
+ sha1((uint8_t *) (hashes - type), (uint8_t *) local, Swap(local->length));
+ }
+ }
+
super->count = Swap(count);
- super->length = Swap(offset);
+ super->blob.length = Swap(offset);
+
+ if (offset > size) {
+ fprintf(stderr, "offset (%u) > size (%u)\n", offset, size);
+ _assert(false);
+ } //else fprintf(stderr, "offset (%zu) <= size (%zu)\n", offset, size);
- _assert(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));
+ _syscall(chown(temp, info.st_uid, info.st_gid));
+ _syscall(chmod(temp, info.st_mode));
_syscall(unlink(path));
_syscall(rename(temp, path));
free(temp);
projects / ldid.git / blobdiff