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_LOAD_DYLIB      uint32_t(0x0c)
 101 #define LC_ID_DYLIB        uint32_t(0x0d)
 102 #define LC_UUID            uint32_t(0x1b)
 103 #define LC_CODE_SIGNATURE  uint32_t(0x1d)
 104 #define LC_REEXPORT_DYLIB  uint32_t(0x1f | LC_REQ_DYLD)
 105
 106 struct dylib {
 107     uint32_t name;
 108     uint32_t timestamp;
 109     uint32_t current_version;
 110     uint32_t compatibility_version;
 111 } _packed;
 112
 113 struct dylib_command {
 114     uint32_t cmd;
 115     uint32_t cmdsize;
 116     struct dylib dylib;
 117 } _packed;
 118
 119 struct uuid_command {
 120     uint32_t cmd;
 121     uint32_t cmdsize;
 122     uint8_t uuid[16];
 123 } _packed;
 124
 125 struct symtab_command {
 126     uint32_t cmd;
 127     uint32_t cmdsize;
 128     uint32_t symoff;
 129     uint32_t nsyms;
 130     uint32_t stroff;
 131     uint32_t strsize;
 132 } _packed;
 133
 134 struct segment_command {
 135     uint32_t cmd;
 136     uint32_t cmdsize;
 137     char segname[16];
 138     uint32_t vmaddr;
 139     uint32_t vmsize;
 140     uint32_t fileoff;
 141     uint32_t filesize;
 142     uint32_t maxprot;
 143     uint32_t initprot;
 144     uint32_t nsects;
 145     uint32_t flags;
 146 };
 147
 148 struct section {
 149     char sectname[16];
 150     char segname[16];
 151     uint32_t addr;
 152     uint32_t size;
 153     uint32_t offset;
 154     uint32_t align;
 155     uint32_t reloff;
 156     uint32_t nreloc;
 157     uint32_t flags;
 158     uint32_t reserved1;
 159     uint32_t reserved2;
 160 };
 161
 162 struct linkedit_data_command {
 163     uint32_t cmd;
 164     uint32_t cmdsize;
 165     uint32_t dataoff;
 166     uint32_t datasize;
 167 } _packed;
 168
 169 uint16_t Swap_(uint16_t value) {
 170     return
 171         ((value >>  8) & 0x00ff) |
 172         ((value <<  8) & 0xff00);
 173 }
 174
 175 uint32_t Swap_(uint32_t value) {
 176     value = ((value >>  8) & 0x00ff00ff) |
 177             ((value <<  8) & 0xff00ff00);
 178     value = ((value >> 16) & 0x0000ffff) |
 179             ((value << 16) & 0xffff0000);
 180     return value;
 181 }
 182
 183 int16_t Swap_(int16_t value) {
 184     return Swap_(static_cast<uint16_t>(value));
 185 }
 186
 187 int32_t Swap_(int32_t value) {
 188     return Swap_(static_cast<uint32_t>(value));
 189 }
 190
 191 bool little_(true);
 192
 193 uint16_t Swap(uint16_t value) {
 194     return little_ ? Swap_(value) : value;
 195 }
 196
 197 uint32_t Swap(uint32_t value) {
 198     return little_ ? Swap_(value) : value;
 199 }
 200
 201 int16_t Swap(int16_t value) {
 202     return Swap(static_cast<uint16_t>(value));
 203 }
 204
 205 int32_t Swap(int32_t value) {
 206     return Swap(static_cast<uint32_t>(value));
 207 }
 208
 209 template <typename Target_>
 210 class Pointer;
 211
 212 class Data {
 213   private:
 214     void *base_;
 215     size_t size_;
 216
 217   protected:
 218     bool swapped_;
 219
 220   public:
 221     Data(void *base, size_t size) :
 222         base_(base),
 223         size_(size),
 224         swapped_(false)
 225     {
 226     }
 227
 228     uint16_t Swap(uint16_t value) const {
 229         return swapped_ ? Swap_(value) : value;
 230     }
 231
 232     uint32_t Swap(uint32_t value) const {
 233         return swapped_ ? Swap_(value) : value;
 234     }
 235
 236     int16_t Swap(int16_t value) const {
 237         return Swap(static_cast<uint16_t>(value));
 238     }
 239
 240     int32_t Swap(int32_t value) const {
 241         return Swap(static_cast<uint32_t>(value));
 242     }
 243
 244     void *GetBase() const {
 245         return base_;
 246     }
 247
 248     size_t GetSize() const {
 249         return size_;
 250     }
 251 };
 252
 253 class MachHeader :
 254     public Data
 255 {
 256   private:
 257     bool bits64_;
 258
 259     struct mach_header *mach_header_;
 260     struct load_command *load_command_;
 261
 262   public:
 263     MachHeader(void *base, size_t size) :
 264         Data(base, size)
 265     {
 266         mach_header_ = (mach_header *) base;
 267
 268         switch (Swap(mach_header_->magic)) {
 269             case MH_CIGAM:
 270                 swapped_ = !swapped_;
 271             case MH_MAGIC:
 272                 bits64_ = false;
 273             break;
 274
 275             case MH_CIGAM_64:
 276                 swapped_ = !swapped_;
 277             case MH_MAGIC_64:
 278                 bits64_ = true;
 279             break;
 280
 281             default:
 282                 _assert(false);
 283         }
 284
 285         void *post = mach_header_ + 1;
 286         if (bits64_)
 287             post = (uint32_t *) post + 1;
 288         load_command_ = (struct load_command *) post;
 289
 290         _assert(
 291             Swap(mach_header_->filetype) == MH_EXECUTE ||
 292             Swap(mach_header_->filetype) == MH_DYLIB ||
 293             Swap(mach_header_->filetype) == MH_BUNDLE
 294         );
 295     }
 296
 297     struct mach_header *operator ->() const {
 298         return mach_header_;
 299     }
 300
 301     uint32_t GetCPUType() const {
 302         return Swap(mach_header_->cputype);
 303     }
 304
 305     uint16_t GetCPUSubtype() const {
 306         return Swap(mach_header_->cpusubtype) & 0xff;
 307     }
 308
 309     std::vector<struct load_command *> GetLoadCommands() const {
 310         std::vector<struct load_command *> load_commands;
 311
 312         struct load_command *load_command = load_command_;
 313         for (uint32_t cmd = 0; cmd != Swap(mach_header_->ncmds); ++cmd) {
 314             load_commands.push_back(load_command);
 315             load_command = (struct load_command *) ((uint8_t *) load_command + Swap(load_command->cmdsize));
 316         }
 317
 318         return load_commands;
 319     }
 320
 321     std::vector<segment_command *> GetSegments(const char *segment_name) {
 322         std::vector<struct segment_command *> segment_commands;
 323
 324         _foreach (load_command, GetLoadCommands())
 325             if (Swap(load_command->cmd) == LC_SEGMENT) {
 326                 segment_command *segment_command = reinterpret_cast<struct segment_command *>(load_command);
 327                 if (strncmp(segment_command->segname, segment_name, 16) == 0)
 328                     segment_commands.push_back(segment_command);
 329             }
 330
 331         return segment_commands;
 332     }
 333
 334     std::vector<section *> GetSections(const char *segment_name, const char *section_name) {
 335         std::vector<section *> sections;
 336
 337         _foreach (segment, GetSegments(segment_name)) {
 338             section *section = (struct section *) (segment + 1);
 339
 340             uint32_t sect;
 341             for (sect = 0; sect != Swap(segment->nsects); ++sect) {
 342                 if (strncmp(section->sectname, section_name, 16) == 0)
 343                     sections.push_back(section);
 344                 ++section;
 345             }
 346         }
 347
 348         return sections;
 349     }
 350
 351     template <typename Target_>
 352     Pointer<Target_> GetPointer(uint32_t address, const char *segment_name = NULL) const {
 353         load_command *load_command = (struct load_command *) (mach_header_ + 1);
 354         uint32_t cmd;
 355
 356         for (cmd = 0; cmd != Swap(mach_header_->ncmds); ++cmd) {
 357             if (Swap(load_command->cmd) == LC_SEGMENT) {
 358                 segment_command *segment_command = (struct segment_command *) load_command;
 359                 if (segment_name != NULL && strncmp(segment_command->segname, segment_name, 16) != 0)
 360                     goto next_command;
 361
 362                 section *sections = (struct section *) (segment_command + 1);
 363
 364                 uint32_t sect;
 365                 for (sect = 0; sect != Swap(segment_command->nsects); ++sect) {
 366                     section *section = &sections[sect];
 367                     //printf("%s %u %p %p %u\n", segment_command->segname, sect, address, section->addr, section->size);
 368                     if (address >= Swap(section->addr) && address < Swap(section->addr) + Swap(section->size)) {
 369                         //printf("0x%.8x %s\n", address, segment_command->segname);
 370                         return Pointer<Target_>(this, reinterpret_cast<Target_ *>(address - Swap(section->addr) + Swap(section->offset) + (char *) mach_header_));
 371                     }
 372                 }
 373             }
 374
 375           next_command:
 376             load_command = (struct load_command *) ((char *) load_command + Swap(load_command->cmdsize));
 377         }
 378
 379         return Pointer<Target_>(this);
 380     }
 381
 382     template <typename Target_>
 383     Pointer<Target_> GetOffset(uint32_t offset) {
 384         return Pointer<Target_>(this, reinterpret_cast<Target_ *>(offset + (uint8_t *) mach_header_));
 385     }
 386 };
 387
 388 class FatHeader :
 389     public Data
 390 {
 391   private:
 392     fat_header *fat_header_;
 393     std::vector<MachHeader> mach_headers_;
 394
 395   public:
 396     FatHeader(void *base, size_t size) :
 397         Data(base, size)
 398     {
 399         fat_header_ = reinterpret_cast<struct fat_header *>(base);
 400
 401         if (Swap(fat_header_->magic) == FAT_CIGAM) {
 402             swapped_ = !swapped_;
 403             goto fat;
 404         } else if (Swap(fat_header_->magic) != FAT_MAGIC) {
 405             fat_header_ = NULL;
 406             mach_headers_.push_back(MachHeader(base, size));
 407         } else fat: {
 408             size_t fat_narch = Swap(fat_header_->nfat_arch);
 409             fat_arch *fat_arch = reinterpret_cast<struct fat_arch *>(fat_header_ + 1);
 410             size_t arch;
 411             for (arch = 0; arch != fat_narch; ++arch) {
 412                 uint32_t arch_offset = Swap(fat_arch->offset);
 413                 uint32_t arch_size = Swap(fat_arch->size);
 414                 mach_headers_.push_back(MachHeader((uint8_t *) base + arch_offset, size));
 415                 ++fat_arch;
 416             }
 417         }
 418     }
 419
 420     std::vector<MachHeader> &GetMachHeaders() {
 421         return mach_headers_;
 422     }
 423
 424     bool IsFat() const {
 425         return fat_header_ != NULL;
 426     }
 427 };
 428
 429 FatHeader Map(const char *path) {
 430     size_t size;
 431     void *base(map(path, 0, _not(size_t), &size, false));
 432     return FatHeader(base, size);
 433 }
 434
 435 template <typename Target_>
 436 class Pointer {
 437   private:
 438     const MachHeader *framework_;
 439     const Target_ *pointer_;
 440
 441   public:
 442     Pointer(const MachHeader *framework = NULL, const Target_ *pointer = NULL) :
 443         framework_(framework),
 444         pointer_(pointer)
 445     {
 446     }
 447
 448     operator const Target_ *() const {
 449         return pointer_;
 450     }
 451
 452     const Target_ *operator ->() const {
 453         return pointer_;
 454     }
 455
 456     Pointer<Target_> &operator ++() {
 457         ++pointer_;
 458         return *this;
 459     }
 460
 461     template <typename Value_>
 462     Value_ Swap(Value_ value) {
 463         return framework_->Swap(value);
 464     }
 465 };
 466
 467 #define CSMAGIC_CODEDIRECTORY      uint32_t(0xfade0c02)
 468 #define CSMAGIC_EMBEDDED_SIGNATURE uint32_t(0xfade0cc0)
 469 #define CSMAGIC_ENTITLEMENTS       uint32_t(0xfade7171)
 470
 471 #define CSSLOT_CODEDIRECTORY uint32_t(0)
 472 #define CSSLOT_REQUIREMENTS  uint32_t(2)
 473 #define CSSLOT_ENTITLEMENTS  uint32_t(5)
 474
 475 struct BlobIndex {
 476     uint32_t type;
 477     uint32_t offset;
 478 } _packed;
 479
 480 struct Blob {
 481     uint32_t magic;
 482     uint32_t length;
 483 } _packed;
 484
 485 struct SuperBlob {
 486     struct Blob blob;
 487     uint32_t count;
 488     struct BlobIndex index[];
 489 } _packed;
 490
 491 struct CodeDirectory {
 492     struct Blob blob;
 493     uint32_t version;
 494     uint32_t flags;
 495     uint32_t hashOffset;
 496     uint32_t identOffset;
 497     uint32_t nSpecialSlots;
 498     uint32_t nCodeSlots;
 499     uint32_t codeLimit;
 500     uint8_t hashSize;
 501     uint8_t hashType;
 502     uint8_t spare1;
 503     uint8_t pageSize;
 504     uint32_t spare2;
 505 } _packed;
 506
 507 extern "C" uint32_t hash(uint8_t *k, uint32_t length, uint32_t initval);
 508
 509 void sha1(uint8_t *hash, uint8_t *data, size_t size) {
 510     SHA1Context context;
 511     SHA1Reset(&context);
 512     SHA1Input(&context, data, size);
 513     SHA1Result(&context, hash);
 514 }
 515
 516 struct CodesignAllocation {
 517     uint32_t type_;
 518     uint16_t subtype_;
 519     size_t size_;
 520
 521     CodesignAllocation(uint32_t type, uint16_t subtype, size_t size) :
 522         type_(type),
 523         subtype_(subtype),
 524         size_(size)
 525     {
 526     }
 527 };
 528
 529 int main(int argc, const char *argv[]) {
 530     union {
 531         uint16_t word;
 532         uint8_t byte[2];
 533     } endian = {1};
 534
 535     little_ = endian.byte[0];
 536
 537     bool flag_R(false);
 538     bool flag_r(false);
 539
 540     bool flag_t(false);
 541     bool flag_p(false);
 542     bool flag_u(false);
 543     bool flag_e(false);
 544
 545     bool flag_T(false);
 546
 547     bool flag_S(false);
 548     bool flag_s(false);
 549
 550     bool timeh(false);
 551     uint32_t timev(0);
 552
 553     const void *xmld(NULL);
 554     size_t xmls(0);
 555
 556     uintptr_t noffset(_not(uintptr_t));
 557     uintptr_t woffset(_not(uintptr_t));
 558
 559     std::vector<std::string> files;
 560
 561     if (argc == 1) {
 562         fprintf(stderr, "usage: %s -S[entitlements.xml] <binary>\n", argv[0]);
 563         fprintf(stderr, "   %s -e MobileSafari\n", argv[0]);
 564         fprintf(stderr, "   %s -S cat\n", argv[0]);
 565         fprintf(stderr, "   %s -Stfp.xml gdb\n", argv[0]);
 566         exit(0);
 567     }
 568
 569     for (int argi(1); argi != argc; ++argi)
 570         if (argv[argi][0] != '-')
 571             files.push_back(argv[argi]);
 572         else switch (argv[argi][1]) {
 573             case 'R': flag_R = true; break;
 574             case 'r': flag_r = true; break;
 575
 576             case 't': flag_t = true; break;
 577             case 'u': flag_u = true; break;
 578             case 'p': flag_p = true; break;
 579             case 'e': flag_e = true; break;
 580
 581             case 's':
 582                 _assert(!flag_S);
 583                 flag_s = true;
 584             break;
 585
 586             case 'S':
 587                 _assert(!flag_s);
 588                 flag_S = true;
 589                 if (argv[argi][2] != '\0') {
 590                     const char *xml = argv[argi] + 2;
 591                     xmld = map(xml, 0, _not(size_t), &xmls, true);
 592                 }
 593             break;
 594
 595             case 'T': {
 596                 flag_T = true;
 597                 if (argv[argi][2] == '-')
 598                     timeh = true;
 599                 else {
 600                     char *arge;
 601                     timev = strtoul(argv[argi] + 2, &arge, 0);
 602                     _assert(arge == argv[argi] + strlen(argv[argi]));
 603                 }
 604             } break;
 605
 606             case 'n': {
 607                 char *arge;
 608                 noffset = strtoul(argv[argi] + 2, &arge, 0);
 609                 _assert(arge == argv[argi] + strlen(argv[argi]));
 610             } break;
 611
 612             case 'w': {
 613                 char *arge;
 614                 woffset = strtoul(argv[argi] + 2, &arge, 0);
 615                 _assert(arge == argv[argi] + strlen(argv[argi]));
 616             } break;
 617
 618             default:
 619                 goto usage;
 620             break;
 621         }
 622
 623     if (files.empty()) usage: {
 624         exit(0);
 625     }
 626
 627     size_t filei(0), filee(0);
 628     _foreach (file, files) try {
 629         const char *path(file.c_str());
 630         const char *base = strrchr(path, '/');
 631         char *temp(NULL), *dir;
 632
 633         if (base != NULL)
 634             dir = strndup_(path, base++ - path + 1);
 635         else {
 636             dir = strdup("");
 637             base = path;
 638         }
 639
 640         if (flag_r) {
 641             size_t clip(_not(size_t)); {
 642                 FatHeader fat_header(Map(path));
 643                 _foreach (mach_header, fat_header.GetMachHeaders()) {
 644                     mach_header->flags = mach_header.Swap(mach_header.Swap(mach_header->flags) | MH_DYLDLINK);
 645
 646                     size_t size(_not(size_t)); {
 647                         _foreach (load_command, mach_header.GetLoadCommands()) {
 648                             switch (mach_header.Swap(load_command->cmd)) {
 649                                 case LC_CODE_SIGNATURE: {
 650                                     struct linkedit_data_command *signature = reinterpret_cast<struct linkedit_data_command *>(load_command);
 651                                     memset(signature, 0, sizeof(struct linkedit_data_command));
 652
 653                                     mach_header->ncmds -= 1;
 654                                     mach_header->sizeofcmds -= sizeof(struct linkedit_data_command);
 655                                 } break;
 656
 657                                 case LC_SYMTAB: {
 658                                     struct symtab_command *symtab = reinterpret_cast<struct symtab_command *>(load_command);
 659                                     size = symtab->stroff + symtab->strsize;
 660                                 } break;
 661                             }
 662                         }
 663
 664                         _foreach (segment, const_cast<MachHeader &>(mach_header).GetSegments("__LINKEDIT")) {
 665                             segment->filesize -= mach_header.GetSize() - size;
 666
 667                             if (!fat_header.IsFat())
 668                                 clip = size;
 669                             else
 670                                 _assert(false);
 671                         }
 672                     }
 673                 }
 674             }
 675
 676             if (clip != _not(size_t))
 677                 _syscall(truncate(path, clip));
 678         }
 679
 680         if (flag_S) {
 681             asprintf(&temp, "%s.%s.cs", dir, base);
 682             const char *allocate = getenv("CODESIGN_ALLOCATE");
 683             if (allocate == NULL)
 684                 allocate = "codesign_allocate";
 685
 686             std::vector<CodesignAllocation> allocations; {
 687                 FatHeader fat_header(Map(path));
 688                 _foreach (mach_header, fat_header.GetMachHeaders()) {
 689                     mach_header->flags = mach_header.Swap(mach_header.Swap(mach_header->flags) | MH_DYLDLINK);
 690
 691                     size_t size(_not(size_t)); {
 692                         _foreach (load_command, mach_header.GetLoadCommands()) {
 693                             uint32_t cmd(mach_header.Swap(load_command->cmd));
 694                             if (cmd == LC_CODE_SIGNATURE) {
 695                                 struct linkedit_data_command *signature = reinterpret_cast<struct linkedit_data_command *>(load_command);
 696                                 size = mach_header.Swap(signature->dataoff);
 697                                 _assert(size < mach_header.GetSize());
 698                                 break;
 699                             }
 700                         }
 701
 702                         if (size == _not(size_t))
 703                             size = mach_header.GetSize();
 704                     }
 705
 706                     allocations.push_back(CodesignAllocation(mach_header.GetCPUType(), mach_header.GetCPUSubtype(), size));
 707                 }
 708             }
 709
 710             pid_t pid = fork();
 711             _syscall(pid);
 712             if (pid == 0) {
 713                 // XXX: this leaks memory, but it doesn't really matter
 714                 std::vector<const char *> args;
 715                 char *arg;
 716
 717                 args.push_back(allocate);
 718
 719                 args.push_back("-i");
 720                 args.push_back(path);
 721
 722                 _foreach (allocation, allocations) {
 723                     args.push_back("-A");
 724
 725                     asprintf(&arg, "%u", allocation.type_);
 726                     args.push_back(arg);
 727
 728                     asprintf(&arg, "%u", allocation.subtype_);
 729                     args.push_back(arg);
 730
 731                     size_t alloc(0);
 732                     alloc += sizeof(struct SuperBlob);
 733                     uint32_t special(0);
 734
 735                     special = std::max(special, CSSLOT_CODEDIRECTORY);
 736                     alloc += sizeof(struct BlobIndex);
 737                     alloc += sizeof(struct CodeDirectory);
 738                     alloc += strlen(base) + 1;
 739
 740                     special = std::max(special, CSSLOT_REQUIREMENTS);
 741                     alloc += sizeof(struct BlobIndex);
 742                     alloc += 0xc;
 743
 744                     if (xmld != NULL) {
 745                         special = std::max(special, CSSLOT_ENTITLEMENTS);
 746                         alloc += sizeof(struct BlobIndex);
 747                         alloc += sizeof(struct Blob);
 748                         alloc += xmls;
 749                     }
 750
 751                     size_t normal((allocation.size_ + 0x1000 - 1) / 0x1000);
 752                     alloc += (special + normal) * 0x14;
 753
 754                     alloc += 15;
 755                     alloc /= 16;
 756                     alloc *= 16;
 757
 758                     asprintf(&arg, "%u", alloc);
 759                     args.push_back(arg);
 760                 }
 761
 762                 args.push_back("-o");
 763                 args.push_back(temp);
 764
 765                 args.push_back(NULL);
 766
 767                 if (false) {
 768                     printf("run:");
 769                     _foreach (arg, args)
 770                         printf(" %s", arg);
 771                     printf("\n");
 772                 }
 773
 774                 execvp(allocate, (char **) &args[0]);
 775                 _assert(false);
 776             }
 777
 778             int status;
 779             _syscall(waitpid(pid, &status, 0));
 780             _assert(WIFEXITED(status));
 781             _assert(WEXITSTATUS(status) == 0);
 782         }
 783
 784         if (flag_p)
 785             printf("path%zu='%s'\n", filei, file.c_str());
 786
 787         FatHeader fat_header(Map(temp == NULL ? path : temp));
 788         struct linkedit_data_command *signature(NULL);
 789
 790         _foreach (mach_header, fat_header.GetMachHeaders()) {
 791             if (woffset != _not(uintptr_t)) {
 792                 Pointer<uint32_t> wvalue(mach_header.GetPointer<uint32_t>(woffset));
 793                 if (wvalue == NULL)
 794                     printf("(null) %p\n", reinterpret_cast<void *>(woffset));
 795                 else
 796                     printf("0x%.08x\n", *wvalue);
 797             }
 798
 799             if (noffset != _not(uintptr_t))
 800                 printf("%s\n", &*mach_header.GetPointer<char>(noffset));
 801
 802             _foreach (load_command, mach_header.GetLoadCommands()) {
 803                 uint32_t cmd(mach_header.Swap(load_command->cmd));
 804
 805                 if (flag_R && cmd == LC_REEXPORT_DYLIB)
 806                     load_command->cmd = mach_header.Swap(LC_LOAD_DYLIB);
 807                 else if (cmd == LC_CODE_SIGNATURE)
 808                     signature = reinterpret_cast<struct linkedit_data_command *>(load_command);
 809                 else if (cmd == LC_UUID) {
 810                     volatile struct uuid_command *uuid_command(reinterpret_cast<struct uuid_command *>(load_command));
 811
 812                     if (flag_u) {
 813                         printf("uuid%zu=%.2x%.2x%.2x%.2x-%.2x%.2x-%.2x%.2x-%.2x%.2x-%.2x%.2x%.2x%.2x%.2x%.2x\n", filei,
 814                             uuid_command->uuid[ 0], uuid_command->uuid[ 1], uuid_command->uuid[ 2], uuid_command->uuid[ 3],
 815                             uuid_command->uuid[ 4], uuid_command->uuid[ 5], uuid_command->uuid[ 6], uuid_command->uuid[ 7],
 816                             uuid_command->uuid[ 8], uuid_command->uuid[ 9], uuid_command->uuid[10], uuid_command->uuid[11],
 817                             uuid_command->uuid[12], uuid_command->uuid[13], uuid_command->uuid[14], uuid_command->uuid[15]
 818                         );
 819                     }
 820                 } else if (cmd == LC_ID_DYLIB) {
 821                     volatile struct dylib_command *dylib_command(reinterpret_cast<struct dylib_command *>(load_command));
 822
 823                     if (flag_t)
 824                         printf("time%zu=0x%.8x\n", filei, mach_header.Swap(dylib_command->dylib.timestamp));
 825
 826                     if (flag_T) {
 827                         uint32_t timed;
 828
 829                         if (!timeh)
 830                             timed = timev;
 831                         else {
 832                             dylib_command->dylib.timestamp = 0;
 833                             timed = hash(reinterpret_cast<uint8_t *>(mach_header.GetBase()), mach_header.GetSize(), timev);
 834                         }
 835
 836                         dylib_command->dylib.timestamp = mach_header.Swap(timed);
 837                     }
 838                 }
 839             }
 840
 841             if (flag_e) {
 842                 _assert(signature != NULL);
 843
 844                 uint32_t data = mach_header.Swap(signature->dataoff);
 845                 uint32_t size = mach_header.Swap(signature->datasize);
 846
 847                 uint8_t *top = reinterpret_cast<uint8_t *>(mach_header.GetBase());
 848                 uint8_t *blob = top + data;
 849                 struct SuperBlob *super = reinterpret_cast<struct SuperBlob *>(blob);
 850
 851                 for (size_t index(0); index != Swap(super->count); ++index)
 852                     if (Swap(super->index[index].type) == CSSLOT_ENTITLEMENTS) {
 853                         uint32_t begin = Swap(super->index[index].offset);
 854                         struct Blob *entitlements = reinterpret_cast<struct Blob *>(blob + begin);
 855                         fwrite(entitlements + 1, 1, Swap(entitlements->length) - sizeof(struct Blob), stdout);
 856                     }
 857             }
 858
 859             if (flag_s) {
 860                 _assert(signature != NULL);
 861
 862                 uint32_t data = mach_header.Swap(signature->dataoff);
 863                 uint32_t size = mach_header.Swap(signature->datasize);
 864
 865                 uint8_t *top = reinterpret_cast<uint8_t *>(mach_header.GetBase());
 866                 uint8_t *blob = top + data;
 867                 struct SuperBlob *super = reinterpret_cast<struct SuperBlob *>(blob);
 868
 869                 for (size_t index(0); index != Swap(super->count); ++index)
 870                     if (Swap(super->index[index].type) == CSSLOT_CODEDIRECTORY) {
 871                         uint32_t begin = Swap(super->index[index].offset);
 872                         struct CodeDirectory *directory = reinterpret_cast<struct CodeDirectory *>(blob + begin);
 873
 874                         uint8_t (*hashes)[20] = reinterpret_cast<uint8_t (*)[20]>(blob + begin + Swap(directory->hashOffset));
 875                         uint32_t pages = Swap(directory->nCodeSlots);
 876
 877                         if (pages != 1)
 878                             for (size_t i = 0; i != pages - 1; ++i)
 879                                 sha1(hashes[i], top + 0x1000 * i, 0x1000);
 880                         if (pages != 0)
 881                             sha1(hashes[pages - 1], top + 0x1000 * (pages - 1), ((data - 1) % 0x1000) + 1);
 882                     }
 883             }
 884
 885             if (flag_S) {
 886                 _assert(signature != NULL);
 887
 888                 uint32_t data = mach_header.Swap(signature->dataoff);
 889                 uint32_t size = mach_header.Swap(signature->datasize);
 890
 891                 uint8_t *top = reinterpret_cast<uint8_t *>(mach_header.GetBase());
 892                 uint8_t *blob = top + data;
 893                 struct SuperBlob *super = reinterpret_cast<struct SuperBlob *>(blob);
 894                 super->blob.magic = Swap(CSMAGIC_EMBEDDED_SIGNATURE);
 895
 896                 uint32_t count = xmld == NULL ? 2 : 3;
 897                 uint32_t offset = sizeof(struct SuperBlob) + count * sizeof(struct BlobIndex);
 898
 899                 super->index[0].type = Swap(CSSLOT_CODEDIRECTORY);
 900                 super->index[0].offset = Swap(offset);
 901
 902                 uint32_t begin = offset;
 903                 struct CodeDirectory *directory = reinterpret_cast<struct CodeDirectory *>(blob + begin);
 904                 offset += sizeof(struct CodeDirectory);
 905
 906                 directory->blob.magic = Swap(CSMAGIC_CODEDIRECTORY);
 907                 directory->version = Swap(uint32_t(0x00020001));
 908                 directory->flags = Swap(uint32_t(0));
 909                 directory->codeLimit = Swap(data);
 910                 directory->hashSize = 0x14;
 911                 directory->hashType = 0x01;
 912                 directory->spare1 = 0x00;
 913                 directory->pageSize = 0x0c;
 914                 directory->spare2 = Swap(uint32_t(0));
 915
 916                 directory->identOffset = Swap(offset - begin);
 917                 strcpy(reinterpret_cast<char *>(blob + offset), base);
 918                 offset += strlen(base) + 1;
 919
 920                 uint32_t special = xmld == NULL ? CSSLOT_REQUIREMENTS : CSSLOT_ENTITLEMENTS;
 921                 directory->nSpecialSlots = Swap(special);
 922
 923                 uint8_t (*hashes)[20] = reinterpret_cast<uint8_t (*)[20]>(blob + offset);
 924                 memset(hashes, 0, sizeof(*hashes) * special);
 925
 926                 offset += sizeof(*hashes) * special;
 927                 hashes += special;
 928
 929                 uint32_t pages = (data + 0x1000 - 1) / 0x1000;
 930                 directory->nCodeSlots = Swap(pages);
 931
 932                 if (pages != 1)
 933                     for (size_t i = 0; i != pages - 1; ++i)
 934                         sha1(hashes[i], top + 0x1000 * i, 0x1000);
 935                 if (pages != 0)
 936                     sha1(hashes[pages - 1], top + 0x1000 * (pages - 1), ((data - 1) % 0x1000) + 1);
 937
 938                 directory->hashOffset = Swap(offset - begin);
 939                 offset += sizeof(*hashes) * pages;
 940                 directory->blob.length = Swap(offset - begin);
 941
 942                 super->index[1].type = Swap(CSSLOT_REQUIREMENTS);
 943                 super->index[1].offset = Swap(offset);
 944
 945                 memcpy(blob + offset, "\xfa\xde\x0c\x01\x00\x00\x00\x0c\x00\x00\x00\x00", 0xc);
 946                 offset += 0xc;
 947
 948                 if (xmld != NULL) {
 949                     super->index[2].type = Swap(CSSLOT_ENTITLEMENTS);
 950                     super->index[2].offset = Swap(offset);
 951
 952                     uint32_t begin = offset;
 953                     struct Blob *entitlements = reinterpret_cast<struct Blob *>(blob + begin);
 954                     offset += sizeof(struct Blob);
 955
 956                     memcpy(blob + offset, xmld, xmls);
 957                     offset += xmls;
 958
 959                     entitlements->magic = Swap(CSMAGIC_ENTITLEMENTS);
 960                     entitlements->length = Swap(offset - begin);
 961                 }
 962
 963                 for (size_t index(0); index != count; ++index) {
 964                     uint32_t type = Swap(super->index[index].type);
 965                     if (type != 0 && type <= special) {
 966                         uint32_t offset = Swap(super->index[index].offset);
 967                         struct Blob *local = (struct Blob *) (blob + offset);
 968                         sha1((uint8_t *) (hashes - type), (uint8_t *) local, Swap(local->length));
 969                     }
 970                 }
 971
 972                 super->count = Swap(count);
 973                 super->blob.length = Swap(offset);
 974
 975                 if (offset > size) {
 976                     fprintf(stderr, "offset (%u) > size (%u)\n", offset, size);
 977                     _assert(false);
 978                 } //else fprintf(stderr, "offset (%zu) <= size (%zu)\n", offset, size);
 979
 980                 memset(blob + offset, 0, size - offset);
 981             }
 982         }
 983
 984         if (flag_S) {
 985             uint8_t *top = reinterpret_cast<uint8_t *>(fat_header.GetBase());
 986             size_t size = fat_header.GetSize();
 987
 988             char *copy;
 989             asprintf(&copy, "%s.%s.cp", dir, base);
 990             FILE *file = fopen(copy, "w+");
 991             size_t writ = fwrite(top, 1, size, file);
 992             _assert(writ == size);
 993             fclose(file);
 994
 995             _syscall(unlink(temp));
 996             free(temp);
 997             temp = copy;
 998         }
 999
1000         if (temp != NULL) {
1001             struct stat info;
1002             _syscall(stat(path, &info));
1003             _syscall(chown(temp, info.st_uid, info.st_gid));
1004             _syscall(chmod(temp, info.st_mode));
1005             _syscall(unlink(path));
1006             _syscall(rename(temp, path));
1007             free(temp);
1008         }
1009
1010         free(dir);
1011         ++filei;
1012     } catch (const char *) {
1013         ++filee;
1014         ++filei;
1015     }
1016
1017     return filee;
1018 }