ldid.cpp

   1 /* ldid - (Mach-O) Link-Loader Identity Editor
   2  * Copyright (C) 2007-2010  Jay Freeman (saurik)
   3 */
   4
   5 /*
   6  *        Redistribution and use in source and binary
   7  * forms, with or without modification, are permitted
   8  * provided that the following conditions are met:
   9  *
  10  * 1. Redistributions of source code must retain the
  11  *    above copyright notice, this list of conditions
  12  *    and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the
  14  *    above copyright notice, this list of conditions
  15  *    and the following disclaimer in the documentation
  16  *    and/or other materials provided with the
  17  *    distribution.
  18  * 3. The name of the author may not be used to endorse
  19  *    or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS''
  23  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
  24  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
  27  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  28  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  29  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  30  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  32  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  33  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  34  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  35  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36 */
  37
  38 #include "minimal/stdlib.h"
  39 #include "minimal/string.h"
  40 #include "minimal/mapping.h"
  41
  42 #include "sha1.h"
  43
  44 #include <cstring>
  45 #include <string>
  46 #include <vector>
  47
  48 #include <sys/wait.h>
  49 #include <sys/types.h>
  50 #include <sys/stat.h>
  51
  52 struct fat_header {
  53     uint32_t magic;
  54     uint32_t nfat_arch;
  55 } _packed;
  56
  57 #define FAT_MAGIC 0xcafebabe
  58 #define FAT_CIGAM 0xbebafeca
  59
  60 struct fat_arch {
  61     uint32_t cputype;
  62     uint32_t cpusubtype;
  63     uint32_t offset;
  64     uint32_t size;
  65     uint32_t align;
  66 } _packed;
  67
  68 struct mach_header {
  69     uint32_t magic;
  70     uint32_t cputype;
  71     uint32_t cpusubtype;
  72     uint32_t filetype;
  73     uint32_t ncmds;
  74     uint32_t sizeofcmds;
  75     uint32_t flags;
  76 } _packed;
  77
  78 #define MH_MAGIC 0xfeedface
  79 #define MH_CIGAM 0xcefaedfe
  80
  81 #define MH_MAGIC_64 0xfeedfacf
  82 #define MH_CIGAM_64 0xcffaedfe
  83
  84 #define MH_DYLDLINK   0x4
  85
  86 #define MH_EXECUTE    0x2
  87 #define MH_DYLIB      0x6
  88 #define MH_BUNDLE     0x8
  89 #define MH_DYLIB_STUB 0x9
  90
  91 struct load_command {
  92     uint32_t cmd;
  93     uint32_t cmdsize;
  94 } _packed;
  95
  96 #define LC_REQ_DYLD           uint32_t(0x80000000)
  97
  98 #define LC_SEGMENT            uint32_t(0x01)
  99 #define LC_SYMTAB             uint32_t(0x02)
 100 #define LC_DYSYMTAB           uint32_t(0x0b)
 101 #define LC_LOAD_DYLIB         uint32_t(0x0c)
 102 #define LC_ID_DYLIB           uint32_t(0x0d)
 103 #define LC_SEGMENT_64         uint32_t(0x19)
 104 #define LC_UUID               uint32_t(0x1b)
 105 #define LC_CODE_SIGNATURE     uint32_t(0x1d)
 106 #define LC_SEGMENT_SPLIT_INFO uint32_t(0x1e)
 107 #define LC_REEXPORT_DYLIB     uint32_t(0x1f | LC_REQ_DYLD)
 108 #define LC_DYLD_INFO          uint32_t(0x22)
 109 #define LC_DYLD_INFO_ONLY     uint32_t(0x22 | LC_REQ_DYLD)
 110
 111 struct dylib {
 112     uint32_t name;
 113     uint32_t timestamp;
 114     uint32_t current_version;
 115     uint32_t compatibility_version;
 116 } _packed;
 117
 118 struct dylib_command {
 119     uint32_t cmd;
 120     uint32_t cmdsize;
 121     struct dylib dylib;
 122 } _packed;
 123
 124 struct uuid_command {
 125     uint32_t cmd;
 126     uint32_t cmdsize;
 127     uint8_t uuid[16];
 128 } _packed;
 129
 130 struct symtab_command {
 131     uint32_t cmd;
 132     uint32_t cmdsize;
 133     uint32_t symoff;
 134     uint32_t nsyms;
 135     uint32_t stroff;
 136     uint32_t strsize;
 137 } _packed;
 138
 139 struct dyld_info_command {
 140     uint32_t cmd;
 141     uint32_t cmdsize;
 142     uint32_t rebase_off;
 143     uint32_t rebase_size;
 144     uint32_t bind_off;
 145     uint32_t bind_size;
 146     uint32_t weak_bind_off;
 147     uint32_t weak_bind_size;
 148     uint32_t lazy_bind_off;
 149     uint32_t lazy_bind_size;
 150     uint32_t export_off;
 151     uint32_t export_size;
 152 } _packed;
 153
 154 struct dysymtab_command {
 155     uint32_t cmd;
 156     uint32_t cmdsize;
 157     uint32_t ilocalsym;
 158     uint32_t nlocalsym;
 159     uint32_t iextdefsym;
 160     uint32_t nextdefsym;
 161     uint32_t iundefsym;
 162     uint32_t nundefsym;
 163     uint32_t tocoff;
 164     uint32_t ntoc;
 165     uint32_t modtaboff;
 166     uint32_t nmodtab;
 167     uint32_t extrefsymoff;
 168     uint32_t nextrefsyms;
 169     uint32_t indirectsymoff;
 170     uint32_t nindirectsyms;
 171     uint32_t extreloff;
 172     uint32_t nextrel;
 173     uint32_t locreloff;
 174     uint32_t nlocrel;
 175 } _packed;
 176
 177 struct dylib_table_of_contents {
 178     uint32_t symbol_index;
 179     uint32_t module_index;
 180 } _packed;
 181
 182 struct dylib_module {
 183     uint32_t module_name;
 184     uint32_t iextdefsym;
 185     uint32_t nextdefsym;
 186     uint32_t irefsym;
 187     uint32_t nrefsym;
 188     uint32_t ilocalsym;
 189     uint32_t nlocalsym;
 190     uint32_t iextrel;
 191     uint32_t nextrel;
 192     uint32_t iinit_iterm;
 193     uint32_t ninit_nterm;
 194     uint32_t objc_module_info_addr;
 195     uint32_t objc_module_info_size;
 196 } _packed;
 197
 198 struct dylib_reference {
 199     uint32_t isym:24;
 200     uint32_t flags:8;
 201 } _packed;
 202
 203 struct relocation_info {
 204     int32_t r_address;
 205     uint32_t r_symbolnum:24;
 206     uint32_t r_pcrel:1;
 207     uint32_t r_length:2;
 208     uint32_t r_extern:1;
 209     uint32_t r_type:4;
 210 } _packed;
 211
 212 struct nlist {
 213     union {
 214         char *n_name;
 215         int32_t n_strx;
 216     } n_un;
 217
 218     uint8_t n_type;
 219     uint8_t n_sect;
 220     uint8_t n_desc;
 221     uint32_t n_value;
 222 } _packed;
 223
 224 struct segment_command {
 225     uint32_t cmd;
 226     uint32_t cmdsize;
 227     char segname[16];
 228     uint32_t vmaddr;
 229     uint32_t vmsize;
 230     uint32_t fileoff;
 231     uint32_t filesize;
 232     uint32_t maxprot;
 233     uint32_t initprot;
 234     uint32_t nsects;
 235     uint32_t flags;
 236 };
 237
 238 struct segment_command_64 {
 239     uint32_t cmd;
 240     uint32_t cmdsize;
 241     char segname[16];
 242     uint64_t vmaddr;
 243     uint64_t vmsize;
 244     uint64_t fileoff;
 245     uint64_t filesize;
 246     uint32_t maxprot;
 247     uint32_t initprot;
 248     uint32_t nsects;
 249     uint32_t flags;
 250 };
 251
 252 struct section {
 253     char sectname[16];
 254     char segname[16];
 255     uint32_t addr;
 256     uint32_t size;
 257     uint32_t offset;
 258     uint32_t align;
 259     uint32_t reloff;
 260     uint32_t nreloc;
 261     uint32_t flags;
 262     uint32_t reserved1;
 263     uint32_t reserved2;
 264 };
 265
 266 struct section_64 {
 267     char sectname[16];
 268     char segname[16];
 269     uint64_t addr;
 270     uint64_t size;
 271     uint32_t offset;
 272     uint32_t align;
 273     uint32_t reloff;
 274     uint32_t nreloc;
 275     uint32_t flags;
 276     uint32_t reserved1;
 277     uint32_t reserved2;
 278 };
 279
 280 struct linkedit_data_command {
 281     uint32_t cmd;
 282     uint32_t cmdsize;
 283     uint32_t dataoff;
 284     uint32_t datasize;
 285 } _packed;
 286
 287 uint16_t Swap_(uint16_t value) {
 288     return
 289         ((value >>  8) & 0x00ff) |
 290         ((value <<  8) & 0xff00);
 291 }
 292
 293 uint32_t Swap_(uint32_t value) {
 294     value = ((value >>  8) & 0x00ff00ff) |
 295             ((value <<  8) & 0xff00ff00);
 296     value = ((value >> 16) & 0x0000ffff) |
 297             ((value << 16) & 0xffff0000);
 298     return value;
 299 }
 300
 301 int16_t Swap_(int16_t value) {
 302     return Swap_(static_cast<uint16_t>(value));
 303 }
 304
 305 int32_t Swap_(int32_t value) {
 306     return Swap_(static_cast<uint32_t>(value));
 307 }
 308
 309 bool little_(true);
 310
 311 uint16_t Swap(uint16_t value) {
 312     return little_ ? Swap_(value) : value;
 313 }
 314
 315 uint32_t Swap(uint32_t value) {
 316     return little_ ? Swap_(value) : value;
 317 }
 318
 319 int16_t Swap(int16_t value) {
 320     return Swap(static_cast<uint16_t>(value));
 321 }
 322
 323 int32_t Swap(int32_t value) {
 324     return Swap(static_cast<uint32_t>(value));
 325 }
 326
 327 template <typename Target_>
 328 class Pointer;
 329
 330 class Data {
 331   private:
 332     void *base_;
 333     size_t size_;
 334
 335   protected:
 336     bool swapped_;
 337
 338   public:
 339     Data(void *base, size_t size) :
 340         base_(base),
 341         size_(size),
 342         swapped_(false)
 343     {
 344     }
 345
 346     uint16_t Swap(uint16_t value) const {
 347         return swapped_ ? Swap_(value) : value;
 348     }
 349
 350     uint32_t Swap(uint32_t value) const {
 351         return swapped_ ? Swap_(value) : value;
 352     }
 353
 354     int16_t Swap(int16_t value) const {
 355         return Swap(static_cast<uint16_t>(value));
 356     }
 357
 358     int32_t Swap(int32_t value) const {
 359         return Swap(static_cast<uint32_t>(value));
 360     }
 361
 362     void *GetBase() const {
 363         return base_;
 364     }
 365
 366     size_t GetSize() const {
 367         return size_;
 368     }
 369 };
 370
 371 class MachHeader :
 372     public Data
 373 {
 374   private:
 375     bool bits64_;
 376
 377     struct mach_header *mach_header_;
 378     struct load_command *load_command_;
 379
 380   public:
 381     MachHeader(void *base, size_t size) :
 382         Data(base, size)
 383     {
 384         mach_header_ = (mach_header *) base;
 385
 386         switch (Swap(mach_header_->magic)) {
 387             case MH_CIGAM:
 388                 swapped_ = !swapped_;
 389             case MH_MAGIC:
 390                 bits64_ = false;
 391             break;
 392
 393             case MH_CIGAM_64:
 394                 swapped_ = !swapped_;
 395             case MH_MAGIC_64:
 396                 bits64_ = true;
 397             break;
 398
 399             default:
 400                 _assert(false);
 401         }
 402
 403         void *post = mach_header_ + 1;
 404         if (bits64_)
 405             post = (uint32_t *) post + 1;
 406         load_command_ = (struct load_command *) post;
 407
 408         _assert(
 409             Swap(mach_header_->filetype) == MH_EXECUTE ||
 410             Swap(mach_header_->filetype) == MH_DYLIB ||
 411             Swap(mach_header_->filetype) == MH_BUNDLE
 412         );
 413     }
 414
 415     struct mach_header *operator ->() const {
 416         return mach_header_;
 417     }
 418
 419     uint32_t GetCPUType() const {
 420         return Swap(mach_header_->cputype);
 421     }
 422
 423     uint16_t GetCPUSubtype() const {
 424         return Swap(mach_header_->cpusubtype) & 0xff;
 425     }
 426
 427     std::vector<struct load_command *> GetLoadCommands() const {
 428         std::vector<struct load_command *> load_commands;
 429
 430         struct load_command *load_command = load_command_;
 431         for (uint32_t cmd = 0; cmd != Swap(mach_header_->ncmds); ++cmd) {
 432             load_commands.push_back(load_command);
 433             load_command = (struct load_command *) ((uint8_t *) load_command + Swap(load_command->cmdsize));
 434         }
 435
 436         return load_commands;
 437     }
 438
 439     std::vector<segment_command *> GetSegments(const char *segment_name) {
 440         std::vector<struct segment_command *> segment_commands;
 441
 442         _foreach (load_command, GetLoadCommands()) {
 443             if (Swap(load_command->cmd) == LC_SEGMENT) {
 444                 segment_command *segment_command = reinterpret_cast<struct segment_command *>(load_command);
 445                 if (strncmp(segment_command->segname, segment_name, 16) == 0)
 446                     segment_commands.push_back(segment_command);
 447             }
 448         }
 449
 450         return segment_commands;
 451     }
 452
 453     std::vector<segment_command_64 *> GetSegments64(const char *segment_name) {
 454         std::vector<struct segment_command_64 *> segment_commands;
 455
 456         _foreach (load_command, GetLoadCommands()) {
 457             if (Swap(load_command->cmd) == LC_SEGMENT_64) {
 458                 segment_command_64 *segment_command = reinterpret_cast<struct segment_command_64 *>(load_command);
 459                 if (strncmp(segment_command->segname, segment_name, 16) == 0)
 460                     segment_commands.push_back(segment_command);
 461             }
 462         }
 463
 464         return segment_commands;
 465     }
 466
 467     std::vector<section *> GetSections(const char *segment_name, const char *section_name) {
 468         std::vector<section *> sections;
 469
 470         _foreach (segment, GetSegments(segment_name)) {
 471             section *section = (struct section *) (segment + 1);
 472
 473             uint32_t sect;
 474             for (sect = 0; sect != Swap(segment->nsects); ++sect) {
 475                 if (strncmp(section->sectname, section_name, 16) == 0)
 476                     sections.push_back(section);
 477                 ++section;
 478             }
 479         }
 480
 481         return sections;
 482     }
 483
 484     template <typename Target_>
 485     Pointer<Target_> GetPointer(uint32_t address, const char *segment_name = NULL) const {
 486         load_command *load_command = (struct load_command *) (mach_header_ + 1);
 487         uint32_t cmd;
 488
 489         for (cmd = 0; cmd != Swap(mach_header_->ncmds); ++cmd) {
 490             if (Swap(load_command->cmd) == LC_SEGMENT) {
 491                 segment_command *segment_command = (struct segment_command *) load_command;
 492                 if (segment_name != NULL && strncmp(segment_command->segname, segment_name, 16) != 0)
 493                     goto next_command;
 494
 495                 section *sections = (struct section *) (segment_command + 1);
 496
 497                 uint32_t sect;
 498                 for (sect = 0; sect != Swap(segment_command->nsects); ++sect) {
 499                     section *section = &sections[sect];
 500                     //printf("%s %u %p %p %u\n", segment_command->segname, sect, address, section->addr, section->size);
 501                     if (address >= Swap(section->addr) && address < Swap(section->addr) + Swap(section->size)) {
 502                         //printf("0x%.8x %s\n", address, segment_command->segname);
 503                         return Pointer<Target_>(this, reinterpret_cast<Target_ *>(address - Swap(section->addr) + Swap(section->offset) + (char *) mach_header_));
 504                     }
 505                 }
 506             }
 507
 508           next_command:
 509             load_command = (struct load_command *) ((char *) load_command + Swap(load_command->cmdsize));
 510         }
 511
 512         return Pointer<Target_>(this);
 513     }
 514
 515     template <typename Target_>
 516     Pointer<Target_> GetOffset(uint32_t offset) {
 517         return Pointer<Target_>(this, reinterpret_cast<Target_ *>(offset + (uint8_t *) mach_header_));
 518     }
 519 };
 520
 521 class FatMachHeader :
 522     public MachHeader
 523 {
 524   private:
 525     fat_arch *fat_arch_;
 526
 527   public:
 528     FatMachHeader(void *base, size_t size, fat_arch *fat_arch) :
 529         MachHeader(base, size),
 530         fat_arch_(fat_arch)
 531     {
 532     }
 533
 534     fat_arch *GetFatArch() const {
 535         return fat_arch_;
 536     }
 537 };
 538
 539 class FatHeader :
 540     public Data
 541 {
 542   private:
 543     fat_header *fat_header_;
 544     std::vector<FatMachHeader> mach_headers_;
 545
 546   public:
 547     FatHeader(void *base, size_t size) :
 548         Data(base, size)
 549     {
 550         fat_header_ = reinterpret_cast<struct fat_header *>(base);
 551
 552         if (Swap(fat_header_->magic) == FAT_CIGAM) {
 553             swapped_ = !swapped_;
 554             goto fat;
 555         } else if (Swap(fat_header_->magic) != FAT_MAGIC) {
 556             fat_header_ = NULL;
 557             mach_headers_.push_back(FatMachHeader(base, size, NULL));
 558         } else fat: {
 559             size_t fat_narch = Swap(fat_header_->nfat_arch);
 560             fat_arch *fat_arch = reinterpret_cast<struct fat_arch *>(fat_header_ + 1);
 561             size_t arch;
 562             for (arch = 0; arch != fat_narch; ++arch) {
 563                 uint32_t arch_offset = Swap(fat_arch->offset);
 564                 uint32_t arch_size = Swap(fat_arch->size);
 565                 mach_headers_.push_back(FatMachHeader((uint8_t *) base + arch_offset, arch_size, fat_arch));
 566                 ++fat_arch;
 567             }
 568         }
 569     }
 570
 571     std::vector<FatMachHeader> &GetMachHeaders() {
 572         return mach_headers_;
 573     }
 574
 575     bool IsFat() const {
 576         return fat_header_ != NULL;
 577     }
 578
 579     struct fat_header *operator ->() const {
 580         return fat_header_;
 581     }
 582 };
 583
 584 FatHeader Map(const char *path, bool ro = false) {
 585     size_t size;
 586     void *base(map(path, 0, _not(size_t), &size, ro));
 587     return FatHeader(base, size);
 588 }
 589
 590 template <typename Target_>
 591 class Pointer {
 592   private:
 593     const MachHeader *framework_;
 594     const Target_ *pointer_;
 595
 596   public:
 597     Pointer(const MachHeader *framework = NULL, const Target_ *pointer = NULL) :
 598         framework_(framework),
 599         pointer_(pointer)
 600     {
 601     }
 602
 603     operator const Target_ *() const {
 604         return pointer_;
 605     }
 606
 607     const Target_ *operator ->() const {
 608         return pointer_;
 609     }
 610
 611     Pointer<Target_> &operator ++() {
 612         ++pointer_;
 613         return *this;
 614     }
 615
 616     template <typename Value_>
 617     Value_ Swap(Value_ value) {
 618         return framework_->Swap(value);
 619     }
 620 };
 621
 622 #define CSMAGIC_CODEDIRECTORY      uint32_t(0xfade0c02)
 623 #define CSMAGIC_EMBEDDED_SIGNATURE uint32_t(0xfade0cc0)
 624 #define CSMAGIC_ENTITLEMENTS       uint32_t(0xfade7171)
 625
 626 #define CSSLOT_CODEDIRECTORY uint32_t(0)
 627 #define CSSLOT_REQUIREMENTS  uint32_t(2)
 628 #define CSSLOT_ENTITLEMENTS  uint32_t(5)
 629
 630 struct BlobIndex {
 631     uint32_t type;
 632     uint32_t offset;
 633 } _packed;
 634
 635 struct Blob {
 636     uint32_t magic;
 637     uint32_t length;
 638 } _packed;
 639
 640 struct SuperBlob {
 641     struct Blob blob;
 642     uint32_t count;
 643     struct BlobIndex index[];
 644 } _packed;
 645
 646 struct CodeDirectory {
 647     struct Blob blob;
 648     uint32_t version;
 649     uint32_t flags;
 650     uint32_t hashOffset;
 651     uint32_t identOffset;
 652     uint32_t nSpecialSlots;
 653     uint32_t nCodeSlots;
 654     uint32_t codeLimit;
 655     uint8_t hashSize;
 656     uint8_t hashType;
 657     uint8_t spare1;
 658     uint8_t pageSize;
 659     uint32_t spare2;
 660 } _packed;
 661
 662 extern "C" uint32_t hash(uint8_t *k, uint32_t length, uint32_t initval);
 663
 664 void sha1(uint8_t *hash, uint8_t *data, size_t size) {
 665     SHA1Context context;
 666     SHA1Reset(&context);
 667     SHA1Input(&context, data, size);
 668     SHA1Result(&context, hash);
 669 }
 670
 671 struct CodesignAllocation {
 672     uint32_t type_;
 673     uint16_t subtype_;
 674     size_t size_;
 675
 676     CodesignAllocation(uint32_t type, uint16_t subtype, size_t size) :
 677         type_(type),
 678         subtype_(subtype),
 679         size_(size)
 680     {
 681     }
 682 };
 683
 684 int main(int argc, const char *argv[]) {
 685     union {
 686         uint16_t word;
 687         uint8_t byte[2];
 688     } endian = {1};
 689
 690     little_ = endian.byte[0];
 691
 692     bool flag_R(false);
 693     bool flag_r(false);
 694
 695     bool flag_t(false);
 696     bool flag_p(false);
 697     bool flag_u(false);
 698     bool flag_e(false);
 699
 700     bool flag_T(false);
 701
 702     bool flag_S(false);
 703     bool flag_s(false);
 704
 705     bool timeh(false);
 706     uint32_t timev(0);
 707
 708     const void *xmld(NULL);
 709     size_t xmls(0);
 710
 711     uintptr_t noffset(_not(uintptr_t));
 712     uintptr_t woffset(_not(uintptr_t));
 713
 714     std::vector<std::string> files;
 715
 716     if (argc == 1) {
 717         fprintf(stderr, "usage: %s -S[entitlements.xml] <binary>\n", argv[0]);
 718         fprintf(stderr, "   %s -e MobileSafari\n", argv[0]);
 719         fprintf(stderr, "   %s -S cat\n", argv[0]);
 720         fprintf(stderr, "   %s -Stfp.xml gdb\n", argv[0]);
 721         exit(0);
 722     }
 723
 724     for (int argi(1); argi != argc; ++argi)
 725         if (argv[argi][0] != '-')
 726             files.push_back(argv[argi]);
 727         else switch (argv[argi][1]) {
 728             case 'R': flag_R = true; break;
 729             case 'r': flag_r = true; break;
 730
 731             case 't': flag_t = true; break;
 732             case 'u': flag_u = true; break;
 733             case 'p': flag_p = true; break;
 734             case 'e': flag_e = true; break;
 735
 736             case 's':
 737                 _assert(!flag_S);
 738                 flag_s = true;
 739             break;
 740
 741             case 'S':
 742                 _assert(!flag_s);
 743                 flag_S = true;
 744                 if (argv[argi][2] != '\0') {
 745                     const char *xml = argv[argi] + 2;
 746                     xmld = map(xml, 0, _not(size_t), &xmls, true);
 747                 }
 748             break;
 749
 750             case 'T': {
 751                 flag_T = true;
 752                 if (argv[argi][2] == '-')
 753                     timeh = true;
 754                 else {
 755                     char *arge;
 756                     timev = strtoul(argv[argi] + 2, &arge, 0);
 757                     _assert(arge == argv[argi] + strlen(argv[argi]));
 758                 }
 759             } break;
 760
 761             case 'n': {
 762                 char *arge;
 763                 noffset = strtoul(argv[argi] + 2, &arge, 0);
 764                 _assert(arge == argv[argi] + strlen(argv[argi]));
 765             } break;
 766
 767             case 'w': {
 768                 char *arge;
 769                 woffset = strtoul(argv[argi] + 2, &arge, 0);
 770                 _assert(arge == argv[argi] + strlen(argv[argi]));
 771             } break;
 772
 773             default:
 774                 goto usage;
 775             break;
 776         }
 777
 778     if (files.empty()) usage: {
 779         exit(0);
 780     }
 781
 782     size_t filei(0), filee(0);
 783     _foreach (file, files) try {
 784         const char *path(file.c_str());
 785         const char *base = strrchr(path, '/');
 786         char *temp(NULL), *dir;
 787
 788         if (base != NULL)
 789             dir = strndup_(path, base++ - path + 1);
 790         else {
 791             dir = strdup("");
 792             base = path;
 793         }
 794
 795         if (flag_r) {
 796             uint32_t clip(0); {
 797                 FatHeader fat_header(Map(path));
 798                 _foreach (mach_header, fat_header.GetMachHeaders()) {
 799                     mach_header->flags = mach_header.Swap(mach_header.Swap(mach_header->flags) | MH_DYLDLINK);
 800
 801                     uint32_t size(_not(uint32_t)); {
 802                         _foreach (load_command, mach_header.GetLoadCommands()) {
 803                             switch (mach_header.Swap(load_command->cmd)) {
 804                                 case LC_CODE_SIGNATURE: {
 805                                     struct linkedit_data_command *signature = reinterpret_cast<struct linkedit_data_command *>(load_command);
 806                                     memset(reinterpret_cast<uint8_t *>(mach_header.GetBase()) + mach_header.Swap(signature->dataoff), 0, mach_header.Swap(signature->datasize));
 807                                     memset(signature, 0, sizeof(struct linkedit_data_command));
 808
 809                                     mach_header->ncmds = mach_header.Swap(mach_header.Swap(mach_header->ncmds) - 1);
 810                                     mach_header->sizeofcmds = mach_header.Swap(uint32_t(mach_header.Swap(mach_header->sizeofcmds) - sizeof(struct linkedit_data_command)));
 811                                 } break;
 812
 813                                 case LC_SYMTAB: {
 814                                     struct symtab_command *symtab = reinterpret_cast<struct symtab_command *>(load_command);
 815                                     size = mach_header.Swap(symtab->stroff) + mach_header.Swap(symtab->strsize);
 816                                 } break;
 817                             }
 818                         }
 819                     }
 820
 821                     _assert(size != _not(uint32_t));
 822
 823                     _foreach (segment, const_cast<FatMachHeader &>(mach_header).GetSegments("__LINKEDIT")) {
 824                         segment->filesize -= mach_header.GetSize() - size;
 825
 826                         if (fat_arch *fat_arch = mach_header.GetFatArch()) {
 827                             fat_arch->size = fat_header.Swap(size);
 828                             clip = std::max(clip, fat_header.Swap(fat_arch->offset) + size);
 829                         } else
 830                             clip = std::max(clip, size);
 831                     }
 832
 833                     _foreach (segment, const_cast<FatMachHeader &>(mach_header).GetSegments64("__LINKEDIT")) {
 834                         segment->filesize -= mach_header.GetSize() - size;
 835
 836                         if (fat_arch *fat_arch = mach_header.GetFatArch()) {
 837                             fat_arch->size = fat_header.Swap(size);
 838                             clip = std::max(clip, fat_header.Swap(fat_arch->offset) + size);
 839                         } else
 840                             clip = std::max(clip, size);
 841                     }
 842                 }
 843             }
 844
 845             _assert(clip != 0);
 846             _syscall(truncate(path, clip));
 847         }
 848
 849         if (flag_S) {
 850             asprintf(&temp, "%s.%s.cs", dir, base);
 851             const char *allocate = getenv("CODESIGN_ALLOCATE");
 852             if (allocate == NULL)
 853                 allocate = "codesign_allocate";
 854
 855             std::vector<CodesignAllocation> allocations; {
 856                 FatHeader fat_header(Map(path));
 857                 _foreach (mach_header, fat_header.GetMachHeaders()) {
 858                     mach_header->flags = mach_header.Swap(mach_header.Swap(mach_header->flags) | MH_DYLDLINK);
 859
 860                     size_t size(_not(size_t)); {
 861                         _foreach (load_command, mach_header.GetLoadCommands()) {
 862                             uint32_t cmd(mach_header.Swap(load_command->cmd));
 863                             if (cmd == LC_CODE_SIGNATURE) {
 864                                 struct linkedit_data_command *signature = reinterpret_cast<struct linkedit_data_command *>(load_command);
 865                                 size = mach_header.Swap(signature->dataoff);
 866                                 _assert(size < mach_header.GetSize());
 867                                 break;
 868                             }
 869                         }
 870
 871                         if (size == _not(size_t))
 872                             size = mach_header.GetSize();
 873                     }
 874
 875                     allocations.push_back(CodesignAllocation(mach_header.GetCPUType(), mach_header.GetCPUSubtype(), size));
 876                 }
 877             }
 878
 879             pid_t pid = fork();
 880             _syscall(pid);
 881             if (pid == 0) {
 882                 // XXX: this leaks memory, but it doesn't really matter
 883                 std::vector<const char *> args;
 884                 char *arg;
 885
 886                 args.push_back(allocate);
 887
 888                 args.push_back("-i");
 889                 args.push_back(path);
 890
 891                 _foreach (allocation, allocations) {
 892                     args.push_back("-A");
 893
 894                     asprintf(&arg, "%u", allocation.type_);
 895                     args.push_back(arg);
 896
 897                     asprintf(&arg, "%u", allocation.subtype_);
 898                     args.push_back(arg);
 899
 900                     size_t alloc(0);
 901                     alloc += sizeof(struct SuperBlob);
 902                     uint32_t special(0);
 903
 904                     special = std::max(special, CSSLOT_CODEDIRECTORY);
 905                     alloc += sizeof(struct BlobIndex);
 906                     alloc += sizeof(struct CodeDirectory);
 907                     alloc += strlen(base) + 1;
 908
 909                     special = std::max(special, CSSLOT_REQUIREMENTS);
 910                     alloc += sizeof(struct BlobIndex);
 911                     alloc += 0xc;
 912
 913                     if (xmld != NULL) {
 914                         special = std::max(special, CSSLOT_ENTITLEMENTS);
 915                         alloc += sizeof(struct BlobIndex);
 916                         alloc += sizeof(struct Blob);
 917                         alloc += xmls;
 918                     }
 919
 920                     size_t normal((allocation.size_ + 0x1000 - 1) / 0x1000);
 921                     alloc += (special + normal) * 0x14;
 922
 923                     alloc += 15;
 924                     alloc /= 16;
 925                     alloc *= 16;
 926
 927                     asprintf(&arg, "%u", alloc);
 928                     args.push_back(arg);
 929                 }
 930
 931                 args.push_back("-o");
 932                 args.push_back(temp);
 933
 934                 args.push_back(NULL);
 935
 936                 if (false) {
 937                     printf("run:");
 938                     _foreach (arg, args)
 939                         printf(" %s", arg);
 940                     printf("\n");
 941                 }
 942
 943                 execvp(allocate, (char **) &args[0]);
 944                 _assert(false);
 945             }
 946
 947             int status;
 948             _syscall(waitpid(pid, &status, 0));
 949             _assert(WIFEXITED(status));
 950             _assert(WEXITSTATUS(status) == 0);
 951         }
 952
 953         if (flag_p)
 954             printf("path%zu='%s'\n", filei, file.c_str());
 955
 956         FatHeader fat_header(Map(temp == NULL ? path : temp, !(flag_R | flag_T | flag_s | flag_S)));
 957         struct linkedit_data_command *signature(NULL);
 958
 959         _foreach (mach_header, fat_header.GetMachHeaders()) {
 960             if (woffset != _not(uintptr_t)) {
 961                 Pointer<uint32_t> wvalue(mach_header.GetPointer<uint32_t>(woffset));
 962                 if (wvalue == NULL)
 963                     printf("(null) %p\n", reinterpret_cast<void *>(woffset));
 964                 else
 965                     printf("0x%.08x\n", *wvalue);
 966             }
 967
 968             if (noffset != _not(uintptr_t))
 969                 printf("%s\n", &*mach_header.GetPointer<char>(noffset));
 970
 971             _foreach (load_command, mach_header.GetLoadCommands()) {
 972                 uint32_t cmd(mach_header.Swap(load_command->cmd));
 973
 974                 if (flag_R && cmd == LC_REEXPORT_DYLIB)
 975                     load_command->cmd = mach_header.Swap(LC_LOAD_DYLIB);
 976                 else if (cmd == LC_CODE_SIGNATURE)
 977                     signature = reinterpret_cast<struct linkedit_data_command *>(load_command);
 978                 else if (cmd == LC_UUID) {
 979                     volatile struct uuid_command *uuid_command(reinterpret_cast<struct uuid_command *>(load_command));
 980
 981                     if (flag_u) {
 982                         printf("uuid%zu=%.2x%.2x%.2x%.2x-%.2x%.2x-%.2x%.2x-%.2x%.2x-%.2x%.2x%.2x%.2x%.2x%.2x\n", filei,
 983                             uuid_command->uuid[ 0], uuid_command->uuid[ 1], uuid_command->uuid[ 2], uuid_command->uuid[ 3],
 984                             uuid_command->uuid[ 4], uuid_command->uuid[ 5], uuid_command->uuid[ 6], uuid_command->uuid[ 7],
 985                             uuid_command->uuid[ 8], uuid_command->uuid[ 9], uuid_command->uuid[10], uuid_command->uuid[11],
 986                             uuid_command->uuid[12], uuid_command->uuid[13], uuid_command->uuid[14], uuid_command->uuid[15]
 987                         );
 988                     }
 989                 } else if (cmd == LC_ID_DYLIB) {
 990                     volatile struct dylib_command *dylib_command(reinterpret_cast<struct dylib_command *>(load_command));
 991
 992                     if (flag_t)
 993                         printf("time%zu=0x%.8x\n", filei, mach_header.Swap(dylib_command->dylib.timestamp));
 994
 995                     if (flag_T) {
 996                         uint32_t timed;
 997
 998                         if (!timeh)
 999                             timed = timev;
1000                         else {
1001                             dylib_command->dylib.timestamp = 0;
1002                             timed = hash(reinterpret_cast<uint8_t *>(mach_header.GetBase()), mach_header.GetSize(), timev);
1003                         }
1004
1005                         dylib_command->dylib.timestamp = mach_header.Swap(timed);
1006                     }
1007                 }
1008             }
1009
1010             if (flag_e) {
1011                 _assert(signature != NULL);
1012
1013                 uint32_t data = mach_header.Swap(signature->dataoff);
1014                 uint32_t size = mach_header.Swap(signature->datasize);
1015
1016                 uint8_t *top = reinterpret_cast<uint8_t *>(mach_header.GetBase());
1017                 uint8_t *blob = top + data;
1018                 struct SuperBlob *super = reinterpret_cast<struct SuperBlob *>(blob);
1019
1020                 for (size_t index(0); index != Swap(super->count); ++index)
1021                     if (Swap(super->index[index].type) == CSSLOT_ENTITLEMENTS) {
1022                         uint32_t begin = Swap(super->index[index].offset);
1023                         struct Blob *entitlements = reinterpret_cast<struct Blob *>(blob + begin);
1024                         fwrite(entitlements + 1, 1, Swap(entitlements->length) - sizeof(struct Blob), stdout);
1025                     }
1026             }
1027
1028             if (flag_s) {
1029                 _assert(signature != NULL);
1030
1031                 uint32_t data = mach_header.Swap(signature->dataoff);
1032                 uint32_t size = mach_header.Swap(signature->datasize);
1033
1034                 uint8_t *top = reinterpret_cast<uint8_t *>(mach_header.GetBase());
1035                 uint8_t *blob = top + data;
1036                 struct SuperBlob *super = reinterpret_cast<struct SuperBlob *>(blob);
1037
1038                 for (size_t index(0); index != Swap(super->count); ++index)
1039                     if (Swap(super->index[index].type) == CSSLOT_CODEDIRECTORY) {
1040                         uint32_t begin = Swap(super->index[index].offset);
1041                         struct CodeDirectory *directory = reinterpret_cast<struct CodeDirectory *>(blob + begin);
1042
1043                         uint8_t (*hashes)[20] = reinterpret_cast<uint8_t (*)[20]>(blob + begin + Swap(directory->hashOffset));
1044                         uint32_t pages = Swap(directory->nCodeSlots);
1045
1046                         if (pages != 1)
1047                             for (size_t i = 0; i != pages - 1; ++i)
1048                                 sha1(hashes[i], top + 0x1000 * i, 0x1000);
1049                         if (pages != 0)
1050                             sha1(hashes[pages - 1], top + 0x1000 * (pages - 1), ((data - 1) % 0x1000) + 1);
1051                     }
1052             }
1053
1054             if (flag_S) {
1055                 _assert(signature != NULL);
1056
1057                 uint32_t data = mach_header.Swap(signature->dataoff);
1058                 uint32_t size = mach_header.Swap(signature->datasize);
1059
1060                 uint8_t *top = reinterpret_cast<uint8_t *>(mach_header.GetBase());
1061                 uint8_t *blob = top + data;
1062                 struct SuperBlob *super = reinterpret_cast<struct SuperBlob *>(blob);
1063                 super->blob.magic = Swap(CSMAGIC_EMBEDDED_SIGNATURE);
1064
1065                 uint32_t count = xmld == NULL ? 2 : 3;
1066                 uint32_t offset = sizeof(struct SuperBlob) + count * sizeof(struct BlobIndex);
1067
1068                 super->index[0].type = Swap(CSSLOT_CODEDIRECTORY);
1069                 super->index[0].offset = Swap(offset);
1070
1071                 uint32_t begin = offset;
1072                 struct CodeDirectory *directory = reinterpret_cast<struct CodeDirectory *>(blob + begin);
1073                 offset += sizeof(struct CodeDirectory);
1074
1075                 directory->blob.magic = Swap(CSMAGIC_CODEDIRECTORY);
1076                 directory->version = Swap(uint32_t(0x00020001));
1077                 directory->flags = Swap(uint32_t(0));
1078                 directory->codeLimit = Swap(data);
1079                 directory->hashSize = 0x14;
1080                 directory->hashType = 0x01;
1081                 directory->spare1 = 0x00;
1082                 directory->pageSize = 0x0c;
1083                 directory->spare2 = Swap(uint32_t(0));
1084
1085                 directory->identOffset = Swap(offset - begin);
1086                 strcpy(reinterpret_cast<char *>(blob + offset), base);
1087                 offset += strlen(base) + 1;
1088
1089                 uint32_t special = xmld == NULL ? CSSLOT_REQUIREMENTS : CSSLOT_ENTITLEMENTS;
1090                 directory->nSpecialSlots = Swap(special);
1091
1092                 uint8_t (*hashes)[20] = reinterpret_cast<uint8_t (*)[20]>(blob + offset);
1093                 memset(hashes, 0, sizeof(*hashes) * special);
1094
1095                 offset += sizeof(*hashes) * special;
1096                 hashes += special;
1097
1098                 uint32_t pages = (data + 0x1000 - 1) / 0x1000;
1099                 directory->nCodeSlots = Swap(pages);
1100
1101                 if (pages != 1)
1102                     for (size_t i = 0; i != pages - 1; ++i)
1103                         sha1(hashes[i], top + 0x1000 * i, 0x1000);
1104                 if (pages != 0)
1105                     sha1(hashes[pages - 1], top + 0x1000 * (pages - 1), ((data - 1) % 0x1000) + 1);
1106
1107                 directory->hashOffset = Swap(offset - begin);
1108                 offset += sizeof(*hashes) * pages;
1109                 directory->blob.length = Swap(offset - begin);
1110
1111                 super->index[1].type = Swap(CSSLOT_REQUIREMENTS);
1112                 super->index[1].offset = Swap(offset);
1113
1114                 memcpy(blob + offset, "\xfa\xde\x0c\x01\x00\x00\x00\x0c\x00\x00\x00\x00", 0xc);
1115                 offset += 0xc;
1116
1117                 if (xmld != NULL) {
1118                     super->index[2].type = Swap(CSSLOT_ENTITLEMENTS);
1119                     super->index[2].offset = Swap(offset);
1120
1121                     uint32_t begin = offset;
1122                     struct Blob *entitlements = reinterpret_cast<struct Blob *>(blob + begin);
1123                     offset += sizeof(struct Blob);
1124
1125                     memcpy(blob + offset, xmld, xmls);
1126                     offset += xmls;
1127
1128                     entitlements->magic = Swap(CSMAGIC_ENTITLEMENTS);
1129                     entitlements->length = Swap(offset - begin);
1130                 }
1131
1132                 for (size_t index(0); index != count; ++index) {
1133                     uint32_t type = Swap(super->index[index].type);
1134                     if (type != 0 && type <= special) {
1135                         uint32_t offset = Swap(super->index[index].offset);
1136                         struct Blob *local = (struct Blob *) (blob + offset);
1137                         sha1((uint8_t *) (hashes - type), (uint8_t *) local, Swap(local->length));
1138                     }
1139                 }
1140
1141                 super->count = Swap(count);
1142                 super->blob.length = Swap(offset);
1143
1144                 if (offset > size) {
1145                     fprintf(stderr, "offset (%u) > size (%u)\n", offset, size);
1146                     _assert(false);
1147                 } //else fprintf(stderr, "offset (%zu) <= size (%zu)\n", offset, size);
1148
1149                 memset(blob + offset, 0, size - offset);
1150             }
1151         }
1152
1153         if (flag_S) {
1154             uint8_t *top = reinterpret_cast<uint8_t *>(fat_header.GetBase());
1155             size_t size = fat_header.GetSize();
1156
1157             char *copy;
1158             asprintf(&copy, "%s.%s.cp", dir, base);
1159             FILE *file = fopen(copy, "w+");
1160             size_t writ = fwrite(top, 1, size, file);
1161             _assert(writ == size);
1162             fclose(file);
1163
1164             _syscall(unlink(temp));
1165             free(temp);
1166             temp = copy;
1167         }
1168
1169         if (temp != NULL) {
1170             struct stat info;
1171             _syscall(stat(path, &info));
1172             _syscall(chown(temp, info.st_uid, info.st_gid));
1173             _syscall(chmod(temp, info.st_mode));
1174             _syscall(unlink(path));
1175             _syscall(rename(temp, path));
1176             free(temp);
1177         }
1178
1179         free(dir);
1180         ++filei;
1181     } catch (const char *) {
1182         ++filee;
1183         ++filei;
1184     }
1185
1186     return filee;
1187 }