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|
/* JocStrap - Java/Objective-C Bootstrap
* Copyright (C) 2007 Jay Freeman (saurik)
*/
/*
* Redistribution and use in source and binary
* forms, with or without modification, are permitted
* provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the
* above copyright notice, this list of conditions
* and the following disclaimer.
* 2. Redistributions in binary form must reproduce the
* above copyright notice, this list of conditions
* and the following disclaimer in the documentation
* and/or other materials provided with the
* distribution.
* 3. The name of the author may not be used to endorse
* or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "minimal/stdlib.h"
#include "minimal/mapping.h"
#include "sha1.h"
#include <cstring>
#include <string>
#include <vector>
#include <sys/wait.h>
struct fat_header {
uint32_t magic;
uint32_t nfat_arch;
};
#define FAT_MAGIC 0xcafebabe
#define FAT_CIGAM 0xbebafeca
struct fat_arch {
uint32_t cputype;
uint32_t cpusubtype;
uint32_t offset;
uint32_t size;
uint32_t align;
};
struct mach_header {
uint32_t magic;
uint32_t cputype;
uint32_t cpusubtype;
uint32_t filetype;
uint32_t ncmds;
uint32_t sizeofcmds;
uint32_t flags;
};
#define MH_MAGIC 0xfeedface
#define MH_CIGAM 0xcefaedfe
#define MH_EXECUTE 0x2
#define MH_DYLIB 0x6
#define MH_BUNDLE 0x8
struct load_command {
uint32_t cmd;
uint32_t cmdsize;
};
#define LC_REQ_DYLD 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)
struct dylib {
uint32_t name;
uint32_t timestamp;
uint32_t current_version;
uint32_t compatibility_version;
};
struct dylib_command {
uint32_t cmd;
uint32_t cmdsize;
struct dylib dylib;
};
struct uuid_command {
uint32_t cmd;
uint32_t cmdsize;
uint8_t uuid[16];
};
struct linkedit_data_command {
uint32_t cmd;
uint32_t cmdsize;
uint32_t dataoff;
uint32_t datasize;
};
uint16_t Swap_(uint16_t value) {
return
((value >> 8) & 0x00ff) |
((value << 8) & 0xff00);
}
uint32_t Swap_(uint32_t value) {
value = ((value >> 8) & 0x00ff00ff) |
((value << 8) & 0xff00ff00);
value = ((value >> 16) & 0x0000ffff) |
((value << 16) & 0xffff0000);
return value;
}
int16_t Swap_(int16_t value) {
return Swap_(static_cast<uint16_t>(value));
}
int32_t Swap_(int32_t value) {
return Swap_(static_cast<uint32_t>(value));
}
uint16_t Swap(uint16_t value) {
return true ? Swap_(value) : value;
}
uint32_t Swap(uint32_t value) {
return true ? Swap_(value) : value;
}
int16_t Swap(int16_t value) {
return Swap(static_cast<uint16_t>(value));
}
int32_t Swap(int32_t value) {
return Swap(static_cast<uint32_t>(value));
}
class Framework {
private:
void *base_;
size_t size_;
mach_header *mach_header_;
bool swapped_;
public:
uint16_t Swap(uint16_t value) const {
return swapped_ ? Swap_(value) : value;
}
uint32_t Swap(uint32_t value) const {
return swapped_ ? Swap_(value) : value;
}
int16_t Swap(int16_t value) const {
return Swap(static_cast<uint16_t>(value));
}
int32_t Swap(int32_t value) const {
return Swap(static_cast<uint32_t>(value));
}
Framework(const char *framework_path) :
swapped_(false)
{
base_ = map(framework_path, 0, _not(size_t), &size_, false);
fat_header *fat_header = reinterpret_cast<struct fat_header *>(base_);
if (Swap(fat_header->magic) == FAT_CIGAM) {
swapped_ = !swapped_;
goto fat;
} else if (Swap(fat_header->magic) != FAT_MAGIC)
mach_header_ = (mach_header *) base_;
else fat: {
size_t fat_narch = Swap(fat_header->nfat_arch);
fat_arch *fat_arch = reinterpret_cast<struct fat_arch *>(fat_header + 1);
size_t arch;
for (arch = 0; arch != fat_narch; ++arch) {
uint32_t arch_offset = Swap(fat_arch->offset);
mach_header_ = (mach_header *) ((uint8_t *) base_ + arch_offset);
goto found;
++fat_arch;
}
_assert(false);
}
found:
if (Swap(mach_header_->magic) == MH_CIGAM)
swapped_ = !swapped_;
else _assert(Swap(mach_header_->magic) == MH_MAGIC);
_assert(
Swap(mach_header_->filetype) == MH_EXECUTE ||
Swap(mach_header_->filetype) == MH_DYLIB ||
Swap(mach_header_->filetype) == MH_BUNDLE
);
}
void *GetBase() {
return base_;
}
size_t GetSize() {
return size_;
}
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);
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;
}
};
#define CSMAGIC_CODEDIRECTORY 0xfade0c02
#define CSMAGIC_EMBEDDED_SIGNATURE 0xfade0cc0
#define CSSLOT_CODEDIRECTORY 0
struct BlobIndex {
uint32_t type;
uint32_t offset;
};
struct SuperBlob {
uint32_t magic;
uint32_t length;
uint32_t count;
struct BlobIndex index[];
};
struct CodeDirectory {
uint32_t magic;
uint32_t length;
uint32_t version;
uint32_t flags;
uint32_t hashOffset;
uint32_t identOffset;
uint32_t nSpecialSlots;
uint32_t nCodeSlots;
uint32_t codeLimit;
uint8_t hashSize;
uint8_t hashType;
uint8_t spare1;
uint8_t pageSize;
uint32_t spare2;
};
extern "C" uint32_t hash(uint8_t *k, uint32_t length, uint32_t initval);
#define CODESIGN_ALLOCATE "arm-apple-darwin9-codesign_allocate"
void sha1(uint8_t *hash, uint8_t *data, size_t size) {
SHA1Context context;
SHA1Reset(&context);
SHA1Input(&context, data, size);
SHA1Result(&context, hash);
}
int main(int argc, const char *argv[]) {
bool flag_R(false);
bool flag_t(false);
bool flag_p(false);
bool flag_u(false);
bool flag_T(false);
bool flag_S(false);
bool timeh(false);
uint32_t timev(0);
std::vector<std::string> files;
_assert(argc != 0);
for (int argi(1); argi != argc; ++argi)
if (argv[argi][0] != '-')
files.push_back(argv[argi]);
else switch (argv[argi][1]) {
case 'R': flag_R = true; break;
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 'T': {
flag_T = true;
if (argv[argi][2] == '-')
timeh = true;
else {
char *arge;
timev = strtoul(argv[argi] + 2, &arge, 0);
_assert(arge == argv[argi] + strlen(argv[argi]));
}
} break;
default:
goto usage;
break;
}
if (files.empty()) usage: {
exit(0);
}
size_t filei(0), filee(0);
_foreach (file, files) try {
const char *path(file->c_str());
const char *base = strrchr(path, '/');
char *temp(NULL), *dir;
if (base != NULL)
dir = strndup(path, base++ - path + 1);
else {
dir = strdup("");
base = path;
}
if (flag_S) {
asprintf(&temp, "%s.%s.cs", dir, base);
const char *allocate = getenv("CODESIGN_ALLOCATE");
if (allocate == NULL)
allocate = "codesign_allocate";
size_t size; {
Framework framework(path);
size = framework.GetSize();
}
pid_t pid = fork();
_syscall(pid);
if (pid == 0) {
char *ssize;
asprintf(&ssize, "%u", (sizeof(struct SuperBlob) + sizeof(struct BlobIndex) + sizeof(struct CodeDirectory) + strlen(base) + 1 + (size + 0x1000 - 1) / 0x1000 * 0x14 + 15) / 16 * 16);
printf("%s\n", ssize);
execlp(allocate, allocate, "-i", path, "-a", "arm", ssize, "-o", temp, NULL);
_assert(false);
}
int status;
_syscall(waitpid(pid, &status, 0));
_assert(WIFEXITED(status));
_assert(WEXITSTATUS(status) == 0);
}
Framework framework(temp == NULL ? path : temp);
struct linkedit_data_command *signature(NULL);
if (flag_p)
printf("path%zu='%s'\n", filei, file->c_str());
_foreach (load_command, framework.GetLoadCommands()) {
uint32_t cmd(framework.Swap((*load_command)->cmd));
if (flag_R && cmd == LC_REEXPORT_DYLIB)
(*load_command)->cmd = framework.Swap(LC_LOAD_DYLIB);
else if (cmd == LC_CODE_SIGNATURE)
signature = reinterpret_cast<struct linkedit_data_command *>(*load_command);
else if (cmd == LC_UUID) {
volatile struct uuid_command *uuid_command(reinterpret_cast<struct uuid_command *>(*load_command));
if (flag_u) {
printf("uuid%zu=%.2x%.2x%.2x%.2x-%.2x%.2x-%.2x%.2x-%.2x%.2x-%.2x%.2x%.2x%.2x%.2x%.2x\n", filei,
uuid_command->uuid[ 0], uuid_command->uuid[ 1], uuid_command->uuid[ 2], uuid_command->uuid[ 3],
uuid_command->uuid[ 4], uuid_command->uuid[ 5], uuid_command->uuid[ 6], uuid_command->uuid[ 7],
uuid_command->uuid[ 8], uuid_command->uuid[ 9], uuid_command->uuid[10], uuid_command->uuid[11],
uuid_command->uuid[12], uuid_command->uuid[13], uuid_command->uuid[14], uuid_command->uuid[15]
);
}
} else if (cmd == LC_ID_DYLIB) {
volatile struct dylib_command *dylib_command(reinterpret_cast<struct dylib_command *>(*load_command));
if (flag_t)
printf("time%zu=0x%.8x\n", filei, framework.Swap(dylib_command->dylib.timestamp));
if (flag_T) {
uint32_t timed;
if (!timeh)
timed = timev;
else {
dylib_command->dylib.timestamp = 0;
timed = hash(reinterpret_cast<uint8_t *>(framework.GetBase()), framework.GetSize(), timev);
}
dylib_command->dylib.timestamp = framework.Swap(timed);
}
}
}
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);
super->magic = Swap(CSMAGIC_EMBEDDED_SIGNATURE);
uint32_t count = 1;
uint32_t offset = sizeof(struct SuperBlob) + count * sizeof(struct BlobIndex);
super->index[0].type = Swap(CSSLOT_CODEDIRECTORY);
super->index[0].offset = Swap(offset);
uint32_t begin = offset;
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->codeLimit = Swap(data);
directory->hashSize = 0x14;
directory->hashType = 0x01;
directory->spare1 = 0x00;
directory->pageSize = 0x0c;
directory->spare2 = Swap(0);
directory->identOffset = Swap(offset - begin);
strcpy(reinterpret_cast<char *>(blob + offset), base);
offset += strlen(base) + 1;
uint8_t (*hashes)[20] = reinterpret_cast<uint8_t (*)[20]>(blob + offset);
uint32_t special = 0;
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);
if (pages != 0)
sha1(hashes[special + pages - 1], top + 0x1000 * (pages - 1), data % 0x1000);
directory->hashOffset = Swap(offset - begin);
offset += sizeof(*hashes) * (special + pages);
directory->length = Swap(offset - begin);
super->count = Swap(count);
super->length = Swap(offset);
_assert(offset < size);
memset(blob + offset, 0, size - offset);
}
if (temp) {
_syscall(unlink(path));
_syscall(rename(temp, path));
free(temp);
}
free(dir);
++filei;
} catch (const char *) {
++filee;
++filei;
}
return filee;
}
|