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[ldid.git] / ldid.cpp
1 /* ldid - (Mach-O) Link-Loader Identity Editor
2 * Copyright (C) 2007-2012 Jay Freeman (saurik)
3 */
4
5 /* GNU Affero General Public License, Version 3 {{{ */
6 /*
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU Affero General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU Affero General Public License for more details.
16
17 * You should have received a copy of the GNU Affero General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 **/
20 /* }}} */
21
22 #include "minimal/stdlib.h"
23 #include "minimal/string.h"
24 #include "minimal/mapping.h"
25
26 extern "C" {
27 #include "sha1.h"
28 }
29
30 #include <cstring>
31 #include <string>
32 #include <vector>
33
34 struct fat_header {
35 uint32_t magic;
36 uint32_t nfat_arch;
37 } _packed;
38
39 #define FAT_MAGIC 0xcafebabe
40 #define FAT_CIGAM 0xbebafeca
41
42 struct fat_arch {
43 uint32_t cputype;
44 uint32_t cpusubtype;
45 uint32_t offset;
46 uint32_t size;
47 uint32_t align;
48 } _packed;
49
50 struct mach_header {
51 uint32_t magic;
52 uint32_t cputype;
53 uint32_t cpusubtype;
54 uint32_t filetype;
55 uint32_t ncmds;
56 uint32_t sizeofcmds;
57 uint32_t flags;
58 } _packed;
59
60 #define MH_MAGIC 0xfeedface
61 #define MH_CIGAM 0xcefaedfe
62
63 #define MH_MAGIC_64 0xfeedfacf
64 #define MH_CIGAM_64 0xcffaedfe
65
66 #define MH_DYLDLINK 0x4
67
68 #define MH_OBJECT 0x1
69 #define MH_EXECUTE 0x2
70 #define MH_DYLIB 0x6
71 #define MH_BUNDLE 0x8
72 #define MH_DYLIB_STUB 0x9
73
74 struct load_command {
75 uint32_t cmd;
76 uint32_t cmdsize;
77 } _packed;
78
79 #define LC_REQ_DYLD uint32_t(0x80000000)
80
81 #define LC_SEGMENT uint32_t(0x01)
82 #define LC_SYMTAB uint32_t(0x02)
83 #define LC_DYSYMTAB uint32_t(0x0b)
84 #define LC_LOAD_DYLIB uint32_t(0x0c)
85 #define LC_ID_DYLIB uint32_t(0x0d)
86 #define LC_SEGMENT_64 uint32_t(0x19)
87 #define LC_UUID uint32_t(0x1b)
88 #define LC_CODE_SIGNATURE uint32_t(0x1d)
89 #define LC_SEGMENT_SPLIT_INFO uint32_t(0x1e)
90 #define LC_REEXPORT_DYLIB uint32_t(0x1f | LC_REQ_DYLD)
91 #define LC_ENCRYPTION_INFO uint32_t(0x21)
92 #define LC_DYLD_INFO uint32_t(0x22)
93 #define LC_DYLD_INFO_ONLY uint32_t(0x22 | LC_REQ_DYLD)
94
95 struct dylib {
96 uint32_t name;
97 uint32_t timestamp;
98 uint32_t current_version;
99 uint32_t compatibility_version;
100 } _packed;
101
102 struct dylib_command {
103 uint32_t cmd;
104 uint32_t cmdsize;
105 struct dylib dylib;
106 } _packed;
107
108 struct uuid_command {
109 uint32_t cmd;
110 uint32_t cmdsize;
111 uint8_t uuid[16];
112 } _packed;
113
114 struct symtab_command {
115 uint32_t cmd;
116 uint32_t cmdsize;
117 uint32_t symoff;
118 uint32_t nsyms;
119 uint32_t stroff;
120 uint32_t strsize;
121 } _packed;
122
123 struct dyld_info_command {
124 uint32_t cmd;
125 uint32_t cmdsize;
126 uint32_t rebase_off;
127 uint32_t rebase_size;
128 uint32_t bind_off;
129 uint32_t bind_size;
130 uint32_t weak_bind_off;
131 uint32_t weak_bind_size;
132 uint32_t lazy_bind_off;
133 uint32_t lazy_bind_size;
134 uint32_t export_off;
135 uint32_t export_size;
136 } _packed;
137
138 struct dysymtab_command {
139 uint32_t cmd;
140 uint32_t cmdsize;
141 uint32_t ilocalsym;
142 uint32_t nlocalsym;
143 uint32_t iextdefsym;
144 uint32_t nextdefsym;
145 uint32_t iundefsym;
146 uint32_t nundefsym;
147 uint32_t tocoff;
148 uint32_t ntoc;
149 uint32_t modtaboff;
150 uint32_t nmodtab;
151 uint32_t extrefsymoff;
152 uint32_t nextrefsyms;
153 uint32_t indirectsymoff;
154 uint32_t nindirectsyms;
155 uint32_t extreloff;
156 uint32_t nextrel;
157 uint32_t locreloff;
158 uint32_t nlocrel;
159 } _packed;
160
161 struct dylib_table_of_contents {
162 uint32_t symbol_index;
163 uint32_t module_index;
164 } _packed;
165
166 struct dylib_module {
167 uint32_t module_name;
168 uint32_t iextdefsym;
169 uint32_t nextdefsym;
170 uint32_t irefsym;
171 uint32_t nrefsym;
172 uint32_t ilocalsym;
173 uint32_t nlocalsym;
174 uint32_t iextrel;
175 uint32_t nextrel;
176 uint32_t iinit_iterm;
177 uint32_t ninit_nterm;
178 uint32_t objc_module_info_addr;
179 uint32_t objc_module_info_size;
180 } _packed;
181
182 struct dylib_reference {
183 uint32_t isym:24;
184 uint32_t flags:8;
185 } _packed;
186
187 struct relocation_info {
188 int32_t r_address;
189 uint32_t r_symbolnum:24;
190 uint32_t r_pcrel:1;
191 uint32_t r_length:2;
192 uint32_t r_extern:1;
193 uint32_t r_type:4;
194 } _packed;
195
196 struct nlist {
197 union {
198 char *n_name;
199 int32_t n_strx;
200 } n_un;
201
202 uint8_t n_type;
203 uint8_t n_sect;
204 uint8_t n_desc;
205 uint32_t n_value;
206 } _packed;
207
208 struct segment_command {
209 uint32_t cmd;
210 uint32_t cmdsize;
211 char segname[16];
212 uint32_t vmaddr;
213 uint32_t vmsize;
214 uint32_t fileoff;
215 uint32_t filesize;
216 uint32_t maxprot;
217 uint32_t initprot;
218 uint32_t nsects;
219 uint32_t flags;
220 } _packed;
221
222 struct segment_command_64 {
223 uint32_t cmd;
224 uint32_t cmdsize;
225 char segname[16];
226 uint64_t vmaddr;
227 uint64_t vmsize;
228 uint64_t fileoff;
229 uint64_t filesize;
230 uint32_t maxprot;
231 uint32_t initprot;
232 uint32_t nsects;
233 uint32_t flags;
234 } _packed;
235
236 struct section {
237 char sectname[16];
238 char segname[16];
239 uint32_t addr;
240 uint32_t size;
241 uint32_t offset;
242 uint32_t align;
243 uint32_t reloff;
244 uint32_t nreloc;
245 uint32_t flags;
246 uint32_t reserved1;
247 uint32_t reserved2;
248 } _packed;
249
250 struct section_64 {
251 char sectname[16];
252 char segname[16];
253 uint64_t addr;
254 uint64_t size;
255 uint32_t offset;
256 uint32_t align;
257 uint32_t reloff;
258 uint32_t nreloc;
259 uint32_t flags;
260 uint32_t reserved1;
261 uint32_t reserved2;
262 } _packed;
263
264 struct linkedit_data_command {
265 uint32_t cmd;
266 uint32_t cmdsize;
267 uint32_t dataoff;
268 uint32_t datasize;
269 } _packed;
270
271 struct encryption_info_command {
272 uint32_t cmd;
273 uint32_t cmdsize;
274 uint32_t cryptoff;
275 uint32_t cryptsize;
276 uint32_t cryptid;
277 } _packed;
278
279 #define BIND_OPCODE_MASK 0xf0
280 #define BIND_IMMEDIATE_MASK 0x0f
281 #define BIND_OPCODE_DONE 0x00
282 #define BIND_OPCODE_SET_DYLIB_ORDINAL_IMM 0x10
283 #define BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB 0x20
284 #define BIND_OPCODE_SET_DYLIB_SPECIAL_IMM 0x30
285 #define BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM 0x40
286 #define BIND_OPCODE_SET_TYPE_IMM 0x50
287 #define BIND_OPCODE_SET_ADDEND_SLEB 0x60
288 #define BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB 0x70
289 #define BIND_OPCODE_ADD_ADDR_ULEB 0x80
290 #define BIND_OPCODE_DO_BIND 0x90
291 #define BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB 0xa0
292 #define BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED 0xb0
293 #define BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB 0xc0
294
295 template <typename Type_>
296 Type_ Align(Type_ value, size_t align) {
297 value += align - 1;
298 value /= align;
299 value *= align;
300 return value;
301 }
302
303 uint16_t Swap_(uint16_t value) {
304 return
305 ((value >> 8) & 0x00ff) |
306 ((value << 8) & 0xff00);
307 }
308
309 uint32_t Swap_(uint32_t value) {
310 value = ((value >> 8) & 0x00ff00ff) |
311 ((value << 8) & 0xff00ff00);
312 value = ((value >> 16) & 0x0000ffff) |
313 ((value << 16) & 0xffff0000);
314 return value;
315 }
316
317 uint64_t Swap_(uint64_t value) {
318 value = (value & 0x00000000ffffffff) << 32 | (value & 0xffffffff00000000) >> 32;
319 value = (value & 0x0000ffff0000ffff) << 16 | (value & 0xffff0000ffff0000) >> 16;
320 value = (value & 0x00ff00ff00ff00ff) << 8 | (value & 0xff00ff00ff00ff00) >> 8;
321 return value;
322 }
323
324 int16_t Swap_(int16_t value) {
325 return Swap_(static_cast<uint16_t>(value));
326 }
327
328 int32_t Swap_(int32_t value) {
329 return Swap_(static_cast<uint32_t>(value));
330 }
331
332 int64_t Swap_(int64_t value) {
333 return Swap_(static_cast<uint64_t>(value));
334 }
335
336 bool little_(true);
337
338 uint16_t Swap(uint16_t value) {
339 return little_ ? Swap_(value) : value;
340 }
341
342 uint32_t Swap(uint32_t value) {
343 return little_ ? Swap_(value) : value;
344 }
345
346 uint64_t Swap(uint64_t value) {
347 return little_ ? Swap_(value) : value;
348 }
349
350 int16_t Swap(int16_t value) {
351 return Swap(static_cast<uint16_t>(value));
352 }
353
354 int32_t Swap(int32_t value) {
355 return Swap(static_cast<uint32_t>(value));
356 }
357
358 int64_t Swap(int64_t value) {
359 return Swap(static_cast<uint64_t>(value));
360 }
361
362 template <typename Target_>
363 class Pointer;
364
365 class Data {
366 private:
367 void *base_;
368 size_t size_;
369
370 protected:
371 bool swapped_;
372
373 public:
374 Data(void *base, size_t size) :
375 base_(base),
376 size_(size),
377 swapped_(false)
378 {
379 }
380
381 uint16_t Swap(uint16_t value) const {
382 return swapped_ ? Swap_(value) : value;
383 }
384
385 uint32_t Swap(uint32_t value) const {
386 return swapped_ ? Swap_(value) : value;
387 }
388
389 uint64_t Swap(uint64_t value) const {
390 return swapped_ ? Swap_(value) : value;
391 }
392
393 int16_t Swap(int16_t value) const {
394 return Swap(static_cast<uint16_t>(value));
395 }
396
397 int32_t Swap(int32_t value) const {
398 return Swap(static_cast<uint32_t>(value));
399 }
400
401 int64_t Swap(int64_t value) const {
402 return Swap(static_cast<uint64_t>(value));
403 }
404
405 void *GetBase() const {
406 return base_;
407 }
408
409 size_t GetSize() const {
410 return size_;
411 }
412 };
413
414 class MachHeader :
415 public Data
416 {
417 private:
418 bool bits64_;
419
420 struct mach_header *mach_header_;
421 struct load_command *load_command_;
422
423 public:
424 MachHeader(void *base, size_t size) :
425 Data(base, size)
426 {
427 mach_header_ = (mach_header *) base;
428
429 switch (Swap(mach_header_->magic)) {
430 case MH_CIGAM:
431 swapped_ = !swapped_;
432 case MH_MAGIC:
433 bits64_ = false;
434 break;
435
436 case MH_CIGAM_64:
437 swapped_ = !swapped_;
438 case MH_MAGIC_64:
439 bits64_ = true;
440 break;
441
442 default:
443 _assert(false);
444 }
445
446 void *post = mach_header_ + 1;
447 if (bits64_)
448 post = (uint32_t *) post + 1;
449 load_command_ = (struct load_command *) post;
450
451 _assert(
452 Swap(mach_header_->filetype) == MH_EXECUTE ||
453 Swap(mach_header_->filetype) == MH_DYLIB ||
454 Swap(mach_header_->filetype) == MH_BUNDLE
455 );
456 }
457
458 struct mach_header *operator ->() const {
459 return mach_header_;
460 }
461
462 operator struct mach_header *() const {
463 return mach_header_;
464 }
465
466 uint32_t GetCPUType() const {
467 return Swap(mach_header_->cputype);
468 }
469
470 uint32_t GetCPUSubtype() const {
471 return Swap(mach_header_->cpusubtype) & 0xff;
472 }
473
474 struct load_command *GetLoadCommand() const {
475 return load_command_;
476 }
477
478 std::vector<struct load_command *> GetLoadCommands() const {
479 std::vector<struct load_command *> load_commands;
480
481 struct load_command *load_command = load_command_;
482 for (uint32_t cmd = 0; cmd != Swap(mach_header_->ncmds); ++cmd) {
483 load_commands.push_back(load_command);
484 load_command = (struct load_command *) ((uint8_t *) load_command + Swap(load_command->cmdsize));
485 }
486
487 return load_commands;
488 }
489
490 std::vector<segment_command *> GetSegments(const char *segment_name) const {
491 std::vector<struct segment_command *> segment_commands;
492
493 _foreach (load_command, GetLoadCommands()) {
494 if (Swap(load_command->cmd) == LC_SEGMENT) {
495 segment_command *segment_command = reinterpret_cast<struct segment_command *>(load_command);
496 if (strncmp(segment_command->segname, segment_name, 16) == 0)
497 segment_commands.push_back(segment_command);
498 }
499 }
500
501 return segment_commands;
502 }
503
504 std::vector<segment_command_64 *> GetSegments64(const char *segment_name) const {
505 std::vector<struct segment_command_64 *> segment_commands;
506
507 _foreach (load_command, GetLoadCommands()) {
508 if (Swap(load_command->cmd) == LC_SEGMENT_64) {
509 segment_command_64 *segment_command = reinterpret_cast<struct segment_command_64 *>(load_command);
510 if (strncmp(segment_command->segname, segment_name, 16) == 0)
511 segment_commands.push_back(segment_command);
512 }
513 }
514
515 return segment_commands;
516 }
517
518 std::vector<section *> GetSections(const char *segment_name, const char *section_name) const {
519 std::vector<section *> sections;
520
521 _foreach (segment, GetSegments(segment_name)) {
522 section *section = (struct section *) (segment + 1);
523
524 uint32_t sect;
525 for (sect = 0; sect != Swap(segment->nsects); ++sect) {
526 if (strncmp(section->sectname, section_name, 16) == 0)
527 sections.push_back(section);
528 ++section;
529 }
530 }
531
532 return sections;
533 }
534
535 template <typename Target_>
536 Pointer<Target_> GetPointer(uint32_t address, const char *segment_name = NULL) const {
537 load_command *load_command = (struct load_command *) (mach_header_ + 1);
538 uint32_t cmd;
539
540 for (cmd = 0; cmd != Swap(mach_header_->ncmds); ++cmd) {
541 if (Swap(load_command->cmd) == LC_SEGMENT) {
542 segment_command *segment_command = (struct segment_command *) load_command;
543 if (segment_name != NULL && strncmp(segment_command->segname, segment_name, 16) != 0)
544 goto next_command;
545
546 section *sections = (struct section *) (segment_command + 1);
547
548 uint32_t sect;
549 for (sect = 0; sect != Swap(segment_command->nsects); ++sect) {
550 section *section = &sections[sect];
551 //printf("%s %u %p %p %u\n", segment_command->segname, sect, address, section->addr, section->size);
552 if (address >= Swap(section->addr) && address < Swap(section->addr) + Swap(section->size)) {
553 //printf("0x%.8x %s\n", address, segment_command->segname);
554 return Pointer<Target_>(this, reinterpret_cast<Target_ *>(address - Swap(section->addr) + Swap(section->offset) + (char *) mach_header_));
555 }
556 }
557 }
558
559 next_command:
560 load_command = (struct load_command *) ((char *) load_command + Swap(load_command->cmdsize));
561 }
562
563 return Pointer<Target_>(this);
564 }
565
566 template <typename Target_>
567 Pointer<Target_> GetOffset(uint32_t offset) {
568 return Pointer<Target_>(this, reinterpret_cast<Target_ *>(offset + (uint8_t *) mach_header_));
569 }
570 };
571
572 class FatMachHeader :
573 public MachHeader
574 {
575 private:
576 fat_arch *fat_arch_;
577
578 public:
579 FatMachHeader(void *base, size_t size, fat_arch *fat_arch) :
580 MachHeader(base, size),
581 fat_arch_(fat_arch)
582 {
583 }
584
585 fat_arch *GetFatArch() const {
586 return fat_arch_;
587 }
588 };
589
590 class FatHeader :
591 public Data
592 {
593 private:
594 fat_header *fat_header_;
595 std::vector<FatMachHeader> mach_headers_;
596
597 public:
598 FatHeader(void *base, size_t size) :
599 Data(base, size)
600 {
601 fat_header_ = reinterpret_cast<struct fat_header *>(base);
602
603 if (Swap(fat_header_->magic) == FAT_CIGAM) {
604 swapped_ = !swapped_;
605 goto fat;
606 } else if (Swap(fat_header_->magic) != FAT_MAGIC) {
607 fat_header_ = NULL;
608 mach_headers_.push_back(FatMachHeader(base, size, NULL));
609 } else fat: {
610 size_t fat_narch = Swap(fat_header_->nfat_arch);
611 fat_arch *fat_arch = reinterpret_cast<struct fat_arch *>(fat_header_ + 1);
612 size_t arch;
613 for (arch = 0; arch != fat_narch; ++arch) {
614 uint32_t arch_offset = Swap(fat_arch->offset);
615 uint32_t arch_size = Swap(fat_arch->size);
616 mach_headers_.push_back(FatMachHeader((uint8_t *) base + arch_offset, arch_size, fat_arch));
617 ++fat_arch;
618 }
619 }
620 }
621
622 std::vector<FatMachHeader> &GetMachHeaders() {
623 return mach_headers_;
624 }
625
626 bool IsFat() const {
627 return fat_header_ != NULL;
628 }
629
630 struct fat_header *operator ->() const {
631 return fat_header_;
632 }
633
634 operator struct fat_header *() const {
635 return fat_header_;
636 }
637 };
638
639 FatHeader Map(const char *path, bool ro = false) {
640 size_t size;
641 void *base(map(path, 0, _not(size_t), &size, ro));
642 return FatHeader(base, size);
643 }
644
645 template <typename Target_>
646 class Pointer {
647 private:
648 const MachHeader *framework_;
649 const Target_ *pointer_;
650
651 public:
652 Pointer(const MachHeader *framework = NULL, const Target_ *pointer = NULL) :
653 framework_(framework),
654 pointer_(pointer)
655 {
656 }
657
658 operator const Target_ *() const {
659 return pointer_;
660 }
661
662 const Target_ *operator ->() const {
663 return pointer_;
664 }
665
666 Pointer<Target_> &operator ++() {
667 ++pointer_;
668 return *this;
669 }
670
671 template <typename Value_>
672 Value_ Swap(Value_ value) {
673 return framework_->Swap(value);
674 }
675 };
676
677 #define CSMAGIC_CODEDIRECTORY uint32_t(0xfade0c02)
678 #define CSMAGIC_EMBEDDED_SIGNATURE uint32_t(0xfade0cc0)
679 #define CSMAGIC_ENTITLEMENTS uint32_t(0xfade7171)
680
681 #define CSSLOT_CODEDIRECTORY uint32_t(0)
682 #define CSSLOT_REQUIREMENTS uint32_t(2)
683 #define CSSLOT_ENTITLEMENTS uint32_t(5)
684
685 struct BlobIndex {
686 uint32_t type;
687 uint32_t offset;
688 } _packed;
689
690 struct Blob {
691 uint32_t magic;
692 uint32_t length;
693 } _packed;
694
695 struct SuperBlob {
696 struct Blob blob;
697 uint32_t count;
698 struct BlobIndex index[];
699 } _packed;
700
701 struct CodeDirectory {
702 struct Blob blob;
703 uint32_t version;
704 uint32_t flags;
705 uint32_t hashOffset;
706 uint32_t identOffset;
707 uint32_t nSpecialSlots;
708 uint32_t nCodeSlots;
709 uint32_t codeLimit;
710 uint8_t hashSize;
711 uint8_t hashType;
712 uint8_t spare1;
713 uint8_t pageSize;
714 uint32_t spare2;
715 } _packed;
716
717 extern "C" uint32_t hash(uint8_t *k, uint32_t length, uint32_t initval);
718
719 void sha1(uint8_t *hash, uint8_t *data, size_t size) {
720 SHA1Context context;
721 SHA1Reset(&context);
722 SHA1Input(&context, data, size);
723 SHA1Result(&context, hash);
724 }
725
726 struct CodesignAllocation {
727 FatMachHeader mach_header_;
728 uint32_t offset_;
729 uint32_t size_;
730 uint32_t alloc_;
731
732 CodesignAllocation(FatMachHeader mach_header, size_t offset, size_t size, size_t alloc) :
733 mach_header_(mach_header),
734 offset_(offset),
735 size_(size),
736 alloc_(alloc)
737 {
738 }
739 };
740
741 int main(int argc, const char *argv[]) {
742 union {
743 uint16_t word;
744 uint8_t byte[2];
745 } endian = {1};
746
747 little_ = endian.byte[0];
748
749 bool flag_R(false);
750 bool flag_r(false);
751
752 bool flag_t(false);
753 bool flag_p(false);
754 bool flag_u(false);
755 bool flag_e(false);
756
757 bool flag_T(false);
758
759 bool flag_S(false);
760 bool flag_s(false);
761
762 bool flag_O(false);
763
764 bool flag_D(false);
765 bool flag_d(false);
766
767 bool flag_A(false);
768 bool flag_a(false);
769
770 uint32_t flag_CPUType(_not(uint32_t));
771 uint32_t flag_CPUSubtype(_not(uint32_t));
772
773 const char *flag_I(NULL);
774
775 bool timeh(false);
776 uint32_t timev(0);
777
778 const void *xmld(NULL);
779 size_t xmls(0);
780
781 uintptr_t noffset(_not(uintptr_t));
782 uintptr_t woffset(_not(uintptr_t));
783
784 std::vector<std::string> files;
785
786 if (argc == 1) {
787 fprintf(stderr, "usage: %s -S[entitlements.xml] <binary>\n", argv[0]);
788 fprintf(stderr, " %s -e MobileSafari\n", argv[0]);
789 fprintf(stderr, " %s -S cat\n", argv[0]);
790 fprintf(stderr, " %s -Stfp.xml gdb\n", argv[0]);
791 exit(0);
792 }
793
794 for (int argi(1); argi != argc; ++argi)
795 if (argv[argi][0] != '-')
796 files.push_back(argv[argi]);
797 else switch (argv[argi][1]) {
798 case 'R': flag_R = true; break;
799 case 'r': flag_r = true; break;
800
801 case 't': flag_t = true; break;
802 case 'u': flag_u = true; break;
803 case 'p': flag_p = true; break;
804 case 'e': flag_e = true; break;
805 case 'O': flag_O = true; break;
806
807 case 'D': flag_D = true; break;
808 case 'd': flag_d = true; break;
809
810 case 'a': flag_a = true; break;
811
812 case 'A':
813 flag_A = true;
814 if (argv[argi][2] != '\0') {
815 const char *cpu = argv[argi] + 2;
816 const char *colon = strchr(cpu, ':');
817 _assert(colon != NULL);
818 char *arge;
819 flag_CPUType = strtoul(cpu, &arge, 0);
820 _assert(arge == colon);
821 flag_CPUSubtype = strtoul(colon + 1, &arge, 0);
822 _assert(arge == argv[argi] + strlen(argv[argi]));
823 }
824 break;
825
826 case 's':
827 _assert(!flag_S);
828 flag_s = true;
829 break;
830
831 case 'S':
832 _assert(!flag_s);
833 flag_S = true;
834 if (argv[argi][2] != '\0') {
835 const char *xml = argv[argi] + 2;
836 xmld = map(xml, 0, _not(size_t), &xmls, true);
837 }
838 break;
839
840 case 'T': {
841 flag_T = true;
842 if (argv[argi][2] == '-')
843 timeh = true;
844 else {
845 char *arge;
846 timev = strtoul(argv[argi] + 2, &arge, 0);
847 _assert(arge == argv[argi] + strlen(argv[argi]));
848 }
849 } break;
850
851 case 'I': {
852 flag_I = argv[argi] + 2;
853 } break;
854
855 case 'n': {
856 char *arge;
857 noffset = strtoul(argv[argi] + 2, &arge, 0);
858 _assert(arge == argv[argi] + strlen(argv[argi]));
859 } break;
860
861 case 'w': {
862 char *arge;
863 woffset = strtoul(argv[argi] + 2, &arge, 0);
864 _assert(arge == argv[argi] + strlen(argv[argi]));
865 } break;
866
867 default:
868 goto usage;
869 break;
870 }
871
872 if (files.empty()) usage: {
873 exit(0);
874 }
875
876 size_t filei(0), filee(0);
877 _foreach (file, files) try {
878 const char *path(file.c_str());
879 const char *base = strrchr(path, '/');
880 char *temp(NULL), *dir;
881
882 if (base != NULL)
883 dir = strndup_(path, base++ - path + 1);
884 else {
885 dir = strdup("");
886 base = path;
887 }
888
889 const char *name(flag_I ?: base);
890
891 if (flag_r) {
892 uint32_t clip(0); {
893 FatHeader fat_header(Map(path));
894 _foreach (mach_header, fat_header.GetMachHeaders()) {
895 if (flag_A) {
896 if (mach_header.GetCPUType() != flag_CPUType)
897 continue;
898 if (mach_header.GetCPUSubtype() != flag_CPUSubtype)
899 continue;
900 }
901
902 mach_header->flags = mach_header.Swap(mach_header.Swap(mach_header->flags) | MH_DYLDLINK);
903
904 uint32_t size(_not(uint32_t)); {
905 _foreach (load_command, mach_header.GetLoadCommands()) {
906 switch (mach_header.Swap(load_command->cmd)) {
907 case LC_CODE_SIGNATURE: {
908 struct linkedit_data_command *signature = reinterpret_cast<struct linkedit_data_command *>(load_command);
909 memset(reinterpret_cast<uint8_t *>(mach_header.GetBase()) + mach_header.Swap(signature->dataoff), 0, mach_header.Swap(signature->datasize));
910 memset(signature, 0, sizeof(struct linkedit_data_command));
911
912 mach_header->ncmds = mach_header.Swap(mach_header.Swap(mach_header->ncmds) - 1);
913 mach_header->sizeofcmds = mach_header.Swap(uint32_t(mach_header.Swap(mach_header->sizeofcmds) - sizeof(struct linkedit_data_command)));
914 } break;
915
916 case LC_SYMTAB: {
917 struct symtab_command *symtab = reinterpret_cast<struct symtab_command *>(load_command);
918 size = mach_header.Swap(symtab->stroff) + mach_header.Swap(symtab->strsize);
919 } break;
920 }
921 }
922 }
923
924 _assert(size != _not(uint32_t));
925
926 _foreach (segment, mach_header.GetSegments("__LINKEDIT")) {
927 segment->filesize -= mach_header.GetSize() - size;
928
929 if (fat_arch *fat_arch = mach_header.GetFatArch()) {
930 fat_arch->size = fat_header.Swap(size);
931 clip = std::max(clip, fat_header.Swap(fat_arch->offset) + size);
932 } else
933 clip = std::max(clip, size);
934 }
935
936 _foreach (segment, mach_header.GetSegments64("__LINKEDIT")) {
937 segment->filesize -= mach_header.GetSize() - size;
938
939 if (fat_arch *fat_arch = mach_header.GetFatArch()) {
940 fat_arch->size = fat_header.Swap(size);
941 clip = std::max(clip, fat_header.Swap(fat_arch->offset) + size);
942 } else
943 clip = std::max(clip, size);
944 }
945 }
946 }
947
948 if (clip != 0)
949 _syscall(truncate(path, clip));
950 }
951
952 if (flag_S) {
953 FatHeader source(Map(path));
954
955 size_t offset(0);
956
957 if (source.IsFat())
958 offset += sizeof(fat_header) + sizeof(fat_arch) * source.Swap(source->nfat_arch);
959
960 std::vector<CodesignAllocation> allocations; {
961 _foreach (mach_header, source.GetMachHeaders()) {
962 if (flag_A) {
963 if (mach_header.GetCPUType() != flag_CPUType)
964 continue;
965 if (mach_header.GetCPUSubtype() != flag_CPUSubtype)
966 continue;
967 }
968
969 mach_header->flags = mach_header.Swap(mach_header.Swap(mach_header->flags) | MH_DYLDLINK);
970
971 size_t size(_not(size_t)); {
972 _foreach (load_command, mach_header.GetLoadCommands()) {
973 uint32_t cmd(mach_header.Swap(load_command->cmd));
974 if (cmd == LC_CODE_SIGNATURE) {
975 struct linkedit_data_command *signature = reinterpret_cast<struct linkedit_data_command *>(load_command);
976 size = mach_header.Swap(signature->dataoff);
977 _assert(size < mach_header.GetSize());
978 break;
979 }
980 }
981
982 if (size == _not(size_t))
983 size = mach_header.GetSize();
984 }
985
986 size_t alloc(0);
987 alloc += sizeof(struct SuperBlob);
988 uint32_t special(0);
989
990 special = std::max(special, CSSLOT_CODEDIRECTORY);
991 alloc += sizeof(struct BlobIndex);
992 alloc += sizeof(struct CodeDirectory);
993 alloc += strlen(name) + 1;
994
995 special = std::max(special, CSSLOT_REQUIREMENTS);
996 alloc += sizeof(struct BlobIndex);
997 alloc += 0xc;
998
999 if (xmld != NULL) {
1000 special = std::max(special, CSSLOT_ENTITLEMENTS);
1001 alloc += sizeof(struct BlobIndex);
1002 alloc += sizeof(struct Blob);
1003 alloc += xmls;
1004 }
1005
1006 size_t normal((size + 0x1000 - 1) / 0x1000);
1007 alloc = Align(alloc + (special + normal) * 0x14, 16);
1008
1009 offset = Align(offset, 4096);
1010 allocations.push_back(CodesignAllocation(mach_header, offset, size, alloc));
1011 offset += size + alloc;
1012 }
1013 }
1014
1015 asprintf(&temp, "%s.%s.cs", dir, base);
1016 fclose(fopen(temp, "w+"));
1017 _syscall(truncate(temp, offset));
1018
1019 void *file(map(temp, 0, offset, NULL, false));
1020 memset(file, 0, offset);
1021
1022 fat_arch *fat_arch;
1023 if (!source.IsFat())
1024 fat_arch = NULL;
1025 else {
1026 auto *fat_header(reinterpret_cast<struct fat_header *>(file));
1027 fat_header->magic = Swap(FAT_MAGIC);
1028 fat_header->nfat_arch = Swap(source.Swap(source->nfat_arch));
1029 fat_arch = reinterpret_cast<struct fat_arch *>(fat_header + 1);
1030 }
1031
1032 _foreach (allocation, allocations) {
1033 auto &source(allocation.mach_header_);
1034
1035 uint32_t align(allocation.size_);
1036 align = Align(align, 0x10);
1037
1038 if (fat_arch != NULL) {
1039 fat_arch->cputype = Swap(source->cputype);
1040 fat_arch->cpusubtype = Swap(source->cpusubtype);
1041 fat_arch->offset = Swap(allocation.offset_);
1042 fat_arch->size = Swap(align + allocation.alloc_);
1043 fat_arch->align = Swap(0xc);
1044 ++fat_arch;
1045 }
1046
1047 void *target(reinterpret_cast<uint8_t *>(file) + allocation.offset_);
1048 memcpy(target, source, allocation.size_);
1049 MachHeader mach_header(target, align + allocation.alloc_);
1050
1051 struct linkedit_data_command *signature(NULL);
1052 _foreach (load_command, mach_header.GetLoadCommands()) {
1053 uint32_t cmd(mach_header.Swap(load_command->cmd));
1054 if (cmd != LC_CODE_SIGNATURE)
1055 continue;
1056 signature = reinterpret_cast<struct linkedit_data_command *>(load_command);
1057 break;
1058 }
1059
1060 if (signature == NULL) {
1061 mach_header->ncmds = mach_header.Swap(mach_header.Swap(mach_header->ncmds) + 1);
1062 signature = reinterpret_cast<struct linkedit_data_command *>(reinterpret_cast<uint8_t *>(mach_header.GetLoadCommand()) + mach_header.Swap(mach_header->sizeofcmds));
1063 mach_header->sizeofcmds = mach_header.Swap(mach_header.Swap(mach_header->sizeofcmds) + uint32_t(sizeof(*signature)));
1064 signature->cmd = mach_header.Swap(LC_CODE_SIGNATURE);
1065 signature->cmdsize = mach_header.Swap(uint32_t(sizeof(*signature)));
1066 }
1067
1068 signature->dataoff = mach_header.Swap(align);
1069 signature->datasize = mach_header.Swap(allocation.alloc_);
1070
1071 _foreach (segment, mach_header.GetSegments("__LINKEDIT"))
1072 segment->filesize = mach_header.Swap(align + allocation.alloc_ - mach_header.Swap(segment->fileoff));
1073 _foreach (segment, mach_header.GetSegments64("__LINKEDIT"))
1074 segment->filesize = mach_header.Swap(align + allocation.alloc_ - mach_header.Swap(segment->fileoff));
1075 }
1076 }
1077
1078 if (flag_p)
1079 printf("path%zu='%s'\n", filei, file.c_str());
1080
1081 FatHeader fat_header(Map(temp == NULL ? path : temp, !(flag_R || flag_T || flag_s || flag_S || flag_O || flag_D)));
1082 struct linkedit_data_command *signature(NULL);
1083
1084 _foreach (mach_header, fat_header.GetMachHeaders()) {
1085 if (flag_A) {
1086 if (mach_header.GetCPUType() != flag_CPUType)
1087 continue;
1088 if (mach_header.GetCPUSubtype() != flag_CPUSubtype)
1089 continue;
1090 }
1091
1092 if (flag_a)
1093 printf("cpu=0x%x:0x%x\n", mach_header.GetCPUType(), mach_header.GetCPUSubtype());
1094
1095 if (flag_d) {
1096 if (struct fat_arch *fat_arch = mach_header.GetFatArch())
1097 printf("offset=0x%x\n", Swap(fat_arch->offset));
1098 else
1099 printf("offset=0x0\n");
1100 }
1101
1102 if (woffset != _not(uintptr_t)) {
1103 Pointer<uint32_t> wvalue(mach_header.GetPointer<uint32_t>(woffset));
1104 if (wvalue == NULL)
1105 printf("(null) %p\n", reinterpret_cast<void *>(woffset));
1106 else
1107 printf("0x%.08x\n", *wvalue);
1108 }
1109
1110 if (noffset != _not(uintptr_t))
1111 printf("%s\n", &*mach_header.GetPointer<char>(noffset));
1112
1113 if (flag_d)
1114 _foreach(segment, mach_header.GetSegments("__TEXT")) {
1115 printf("vmaddr=0x%x\n", mach_header.Swap(segment->vmaddr));
1116 printf("fileoff=0x%x\n", mach_header.Swap(segment->fileoff));
1117 }
1118
1119 if (flag_O) {
1120 _foreach(section, mach_header.GetSections("__TEXT", "__text"))
1121 section->addr = mach_header.Swap(0);
1122 }
1123
1124 _foreach (load_command, mach_header.GetLoadCommands()) {
1125 uint32_t cmd(mach_header.Swap(load_command->cmd));
1126
1127 if (flag_R && cmd == LC_REEXPORT_DYLIB)
1128 load_command->cmd = mach_header.Swap(LC_LOAD_DYLIB);
1129 else if (cmd == LC_CODE_SIGNATURE)
1130 signature = reinterpret_cast<struct linkedit_data_command *>(load_command);
1131 else if (cmd == LC_UUID) {
1132 volatile struct uuid_command *uuid_command(reinterpret_cast<struct uuid_command *>(load_command));
1133
1134 if (flag_u) {
1135 printf("uuid%zu=%.2x%.2x%.2x%.2x-%.2x%.2x-%.2x%.2x-%.2x%.2x-%.2x%.2x%.2x%.2x%.2x%.2x\n", filei,
1136 uuid_command->uuid[ 0], uuid_command->uuid[ 1], uuid_command->uuid[ 2], uuid_command->uuid[ 3],
1137 uuid_command->uuid[ 4], uuid_command->uuid[ 5], uuid_command->uuid[ 6], uuid_command->uuid[ 7],
1138 uuid_command->uuid[ 8], uuid_command->uuid[ 9], uuid_command->uuid[10], uuid_command->uuid[11],
1139 uuid_command->uuid[12], uuid_command->uuid[13], uuid_command->uuid[14], uuid_command->uuid[15]
1140 );
1141 }
1142 } else if (cmd == LC_ID_DYLIB) {
1143 volatile struct dylib_command *dylib_command(reinterpret_cast<struct dylib_command *>(load_command));
1144
1145 if (flag_t)
1146 printf("time%zu=0x%.8x\n", filei, mach_header.Swap(dylib_command->dylib.timestamp));
1147
1148 if (flag_T) {
1149 uint32_t timed;
1150
1151 if (!timeh)
1152 timed = timev;
1153 else {
1154 dylib_command->dylib.timestamp = 0;
1155 timed = hash(reinterpret_cast<uint8_t *>(mach_header.GetBase()), mach_header.GetSize(), timev);
1156 }
1157
1158 dylib_command->dylib.timestamp = mach_header.Swap(timed);
1159 }
1160 } else if (cmd == LC_ENCRYPTION_INFO) {
1161 volatile struct encryption_info_command *encryption_info_command(reinterpret_cast<struct encryption_info_command *>(load_command));
1162
1163 if (flag_D)
1164 encryption_info_command->cryptid = mach_header.Swap(0);
1165
1166 if (flag_d) {
1167 printf("cryptoff=0x%x\n", mach_header.Swap(encryption_info_command->cryptoff));
1168 printf("cryptsize=0x%x\n", mach_header.Swap(encryption_info_command->cryptsize));
1169 printf("cryptid=0x%x\n", mach_header.Swap(encryption_info_command->cryptid));
1170 }
1171 }
1172 }
1173
1174 if (flag_e) {
1175 _assert(signature != NULL);
1176
1177 uint32_t data = mach_header.Swap(signature->dataoff);
1178
1179 uint8_t *top = reinterpret_cast<uint8_t *>(mach_header.GetBase());
1180 uint8_t *blob = top + data;
1181 struct SuperBlob *super = reinterpret_cast<struct SuperBlob *>(blob);
1182
1183 for (size_t index(0); index != Swap(super->count); ++index)
1184 if (Swap(super->index[index].type) == CSSLOT_ENTITLEMENTS) {
1185 uint32_t begin = Swap(super->index[index].offset);
1186 struct Blob *entitlements = reinterpret_cast<struct Blob *>(blob + begin);
1187 fwrite(entitlements + 1, 1, Swap(entitlements->length) - sizeof(struct Blob), stdout);
1188 }
1189 }
1190
1191 if (flag_s) {
1192 _assert(signature != NULL);
1193
1194 uint32_t data = mach_header.Swap(signature->dataoff);
1195
1196 uint8_t *top = reinterpret_cast<uint8_t *>(mach_header.GetBase());
1197 uint8_t *blob = top + data;
1198 struct SuperBlob *super = reinterpret_cast<struct SuperBlob *>(blob);
1199
1200 for (size_t index(0); index != Swap(super->count); ++index)
1201 if (Swap(super->index[index].type) == CSSLOT_CODEDIRECTORY) {
1202 uint32_t begin = Swap(super->index[index].offset);
1203 struct CodeDirectory *directory = reinterpret_cast<struct CodeDirectory *>(blob + begin);
1204
1205 uint8_t (*hashes)[20] = reinterpret_cast<uint8_t (*)[20]>(blob + begin + Swap(directory->hashOffset));
1206 uint32_t pages = Swap(directory->nCodeSlots);
1207
1208 if (pages != 1)
1209 for (size_t i = 0; i != pages - 1; ++i)
1210 sha1(hashes[i], top + 0x1000 * i, 0x1000);
1211 if (pages != 0)
1212 sha1(hashes[pages - 1], top + 0x1000 * (pages - 1), ((data - 1) % 0x1000) + 1);
1213 }
1214 }
1215
1216 if (flag_S) {
1217 _assert(signature != NULL);
1218
1219 uint32_t data = mach_header.Swap(signature->dataoff);
1220 uint32_t size = mach_header.Swap(signature->datasize);
1221
1222 uint8_t *top = reinterpret_cast<uint8_t *>(mach_header.GetBase());
1223 uint8_t *blob = top + data;
1224 struct SuperBlob *super = reinterpret_cast<struct SuperBlob *>(blob);
1225 super->blob.magic = Swap(CSMAGIC_EMBEDDED_SIGNATURE);
1226
1227 uint32_t count = xmld == NULL ? 2 : 3;
1228 uint32_t offset = sizeof(struct SuperBlob) + count * sizeof(struct BlobIndex);
1229
1230 super->index[0].type = Swap(CSSLOT_CODEDIRECTORY);
1231 super->index[0].offset = Swap(offset);
1232
1233 uint32_t begin = offset;
1234 struct CodeDirectory *directory = reinterpret_cast<struct CodeDirectory *>(blob + begin);
1235 offset += sizeof(struct CodeDirectory);
1236
1237 directory->blob.magic = Swap(CSMAGIC_CODEDIRECTORY);
1238 directory->version = Swap(uint32_t(0x00020001));
1239 directory->flags = Swap(uint32_t(0));
1240 directory->codeLimit = Swap(data);
1241 directory->hashSize = 0x14;
1242 directory->hashType = 0x01;
1243 directory->spare1 = 0x00;
1244 directory->pageSize = 0x0c;
1245 directory->spare2 = Swap(uint32_t(0));
1246
1247 directory->identOffset = Swap(offset - begin);
1248 strcpy(reinterpret_cast<char *>(blob + offset), name);
1249 offset += strlen(name) + 1;
1250
1251 uint32_t special = xmld == NULL ? CSSLOT_REQUIREMENTS : CSSLOT_ENTITLEMENTS;
1252 directory->nSpecialSlots = Swap(special);
1253
1254 uint8_t (*hashes)[20] = reinterpret_cast<uint8_t (*)[20]>(blob + offset);
1255 memset(hashes, 0, sizeof(*hashes) * special);
1256
1257 offset += sizeof(*hashes) * special;
1258 hashes += special;
1259
1260 uint32_t pages = (data + 0x1000 - 1) / 0x1000;
1261 directory->nCodeSlots = Swap(pages);
1262
1263 if (pages != 1)
1264 for (size_t i = 0; i != pages - 1; ++i)
1265 sha1(hashes[i], top + 0x1000 * i, 0x1000);
1266 if (pages != 0)
1267 sha1(hashes[pages - 1], top + 0x1000 * (pages - 1), ((data - 1) % 0x1000) + 1);
1268
1269 directory->hashOffset = Swap(offset - begin);
1270 offset += sizeof(*hashes) * pages;
1271 directory->blob.length = Swap(offset - begin);
1272
1273 super->index[1].type = Swap(CSSLOT_REQUIREMENTS);
1274 super->index[1].offset = Swap(offset);
1275
1276 memcpy(blob + offset, "\xfa\xde\x0c\x01\x00\x00\x00\x0c\x00\x00\x00\x00", 0xc);
1277 offset += 0xc;
1278
1279 if (xmld != NULL) {
1280 super->index[2].type = Swap(CSSLOT_ENTITLEMENTS);
1281 super->index[2].offset = Swap(offset);
1282
1283 uint32_t begin = offset;
1284 struct Blob *entitlements = reinterpret_cast<struct Blob *>(blob + begin);
1285 offset += sizeof(struct Blob);
1286
1287 memcpy(blob + offset, xmld, xmls);
1288 offset += xmls;
1289
1290 entitlements->magic = Swap(CSMAGIC_ENTITLEMENTS);
1291 entitlements->length = Swap(offset - begin);
1292 }
1293
1294 for (size_t index(0); index != count; ++index) {
1295 uint32_t type = Swap(super->index[index].type);
1296 if (type != 0 && type <= special) {
1297 uint32_t offset = Swap(super->index[index].offset);
1298 struct Blob *local = (struct Blob *) (blob + offset);
1299 sha1((uint8_t *) (hashes - type), (uint8_t *) local, Swap(local->length));
1300 }
1301 }
1302
1303 super->count = Swap(count);
1304 super->blob.length = Swap(offset);
1305
1306 if (offset > size) {
1307 fprintf(stderr, "offset (%u) > size (%u)\n", offset, size);
1308 _assert(false);
1309 } //else fprintf(stderr, "offset (%zu) <= size (%zu)\n", offset, size);
1310
1311 memset(blob + offset, 0, size - offset);
1312 }
1313 }
1314
1315 if (flag_S) {
1316 uint8_t *top = reinterpret_cast<uint8_t *>(fat_header.GetBase());
1317 size_t size = fat_header.GetSize();
1318
1319 char *copy;
1320 asprintf(&copy, "%s.%s.cp", dir, base);
1321 FILE *file = fopen(copy, "w+");
1322 size_t writ = fwrite(top, 1, size, file);
1323 _assert(writ == size);
1324 fclose(file);
1325
1326 _syscall(unlink(temp));
1327 free(temp);
1328 temp = copy;
1329 }
1330
1331 if (temp != NULL) {
1332 struct stat info;
1333 _syscall(stat(path, &info));
1334 _syscall(chown(temp, info.st_uid, info.st_gid));
1335 _syscall(chmod(temp, info.st_mode));
1336 _syscall(unlink(path));
1337 _syscall(rename(temp, path));
1338 free(temp);
1339 }
1340
1341 free(dir);
1342 ++filei;
1343 } catch (const char *) {
1344 ++filee;
1345 ++filei;
1346 }
1347
1348 return filee;
1349 }
Link Identity Editor