ldid.cpp

   1 /* ldid - (Mach-O) Link-Loader Identity Editor
   2  * Copyright (C) 2007-2015  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 <cstdio>
  23 #include <cstdlib>
  24 #include <cstring>
  25 #include <fstream>
  26 #include <iostream>
  27 #include <memory>
  28 #include <set>
  29 #include <sstream>
  30 #include <string>
  31 #include <vector>
  32
  33 #include <dirent.h>
  34 #include <errno.h>
  35 #include <fcntl.h>
  36 #include <regex.h>
  37 #include <stdbool.h>
  38 #include <stdint.h>
  39 #include <unistd.h>
  40
  41 #include <sys/mman.h>
  42 #include <sys/stat.h>
  43 #include <sys/types.h>
  44
  45 #include <openssl/err.h>
  46 #include <openssl/pem.h>
  47 #include <openssl/pkcs7.h>
  48 #include <openssl/pkcs12.h>
  49
  50 #ifdef __APPLE__
  51 #include <CommonCrypto/CommonDigest.h>
  52 #define LDID_SHA1_DIGEST_LENGTH CC_SHA1_DIGEST_LENGTH
  53 #define LDID_SHA1 CC_SHA1
  54 #define LDID_SHA1_CTX CC_SHA1_CTX
  55 #define LDID_SHA1_Init CC_SHA1_Init
  56 #define LDID_SHA1_Update CC_SHA1_Update
  57 #define LDID_SHA1_Final CC_SHA1_Final
  58 #else
  59 #include <openssl/sha.h>
  60 #define LDID_SHA1_DIGEST_LENGTH SHA_DIGEST_LENGTH
  61 #define LDID_SHA1 SHA1
  62 #define LDID_SHA1_CTX SHA_CTX
  63 #define LDID_SHA1_Init SHA1_Init
  64 #define LDID_SHA1_Update SHA1_Update
  65 #define LDID_SHA1_Final SHA1_Final
  66 #endif
  67
  68 #include <plist/plist.h>
  69
  70 #include "ldid.hpp"
  71
  72 #define _assert___(line) \
  73     #line
  74 #define _assert__(line) \
  75     _assert___(line)
  76
  77 #define _assert_(expr, format, ...) \
  78     do if (!(expr)) { \
  79         fprintf(stderr, "%s(%u): _assert(): " format "\n", __FILE__, __LINE__, ## __VA_ARGS__); \
  80         throw __FILE__ "(" _assert__(__LINE__) "): _assert(" #expr ")"; \
  81     } while (false)
  82
  83 #define _assert(expr) \
  84     _assert_(expr, "%s", #expr)
  85
  86 #define _syscall(expr, ...) [&] { for (;;) { \
  87     auto _value(expr); \
  88     if ((long) _value != -1) \
  89         return _value; \
  90     int error(errno); \
  91     if (error == EINTR) \
  92         continue; \
  93     /* XXX: EINTR is included in this list to fix g++ */ \
  94     for (auto success : (long[]) {EINTR, __VA_ARGS__}) \
  95         if (error == success) \
  96             return (decltype(expr)) -success; \
  97     _assert_(false, "errno=%u", error); \
  98 } }()
  99
 100 #define _trace() \
 101     fprintf(stderr, "_trace(%s:%u): %s\n", __FILE__, __LINE__, __FUNCTION__)
 102
 103 #define _not(type) \
 104     ((type) ~ (type) 0)
 105
 106 #define _packed \
 107     __attribute__((packed))
 108
 109 template <typename Type_>
 110 struct Iterator_ {
 111     typedef typename Type_::const_iterator Result;
 112 };
 113
 114 #define _foreach(item, list) \
 115     for (bool _stop(true); _stop; ) \
 116         for (const __typeof__(list) &_list = (list); _stop; _stop = false) \
 117             for (Iterator_<__typeof__(list)>::Result _item = _list.begin(); _item != _list.end(); ++_item) \
 118                 for (bool _suck(true); _suck; _suck = false) \
 119                     for (const __typeof__(*_item) &item = *_item; _suck; _suck = false)
 120
 121 class _Scope {
 122 };
 123
 124 template <typename Function_>
 125 class Scope :
 126     public _Scope
 127 {
 128   private:
 129     Function_ function_;
 130
 131   public:
 132     Scope(const Function_ &function) :
 133         function_(function)
 134     {
 135     }
 136
 137     ~Scope() {
 138         function_();
 139     }
 140 };
 141
 142 template <typename Function_>
 143 Scope<Function_> _scope(const Function_ &function) {
 144     return Scope<Function_>(function);
 145 }
 146
 147 #define _scope__(counter, function) \
 148     __attribute__((__unused__)) \
 149     const _Scope &_scope ## counter(_scope([&]function))
 150 #define _scope_(counter, function) \
 151     _scope__(counter, function)
 152 #define _scope(function) \
 153     _scope_(__COUNTER__, function)
 154
 155 struct fat_header {
 156     uint32_t magic;
 157     uint32_t nfat_arch;
 158 } _packed;
 159
 160 #define FAT_MAGIC 0xcafebabe
 161 #define FAT_CIGAM 0xbebafeca
 162
 163 struct fat_arch {
 164     uint32_t cputype;
 165     uint32_t cpusubtype;
 166     uint32_t offset;
 167     uint32_t size;
 168     uint32_t align;
 169 } _packed;
 170
 171 struct mach_header {
 172     uint32_t magic;
 173     uint32_t cputype;
 174     uint32_t cpusubtype;
 175     uint32_t filetype;
 176     uint32_t ncmds;
 177     uint32_t sizeofcmds;
 178     uint32_t flags;
 179 } _packed;
 180
 181 #define MH_MAGIC 0xfeedface
 182 #define MH_CIGAM 0xcefaedfe
 183
 184 #define MH_MAGIC_64 0xfeedfacf
 185 #define MH_CIGAM_64 0xcffaedfe
 186
 187 #define MH_DYLDLINK   0x4
 188
 189 #define MH_OBJECT     0x1
 190 #define MH_EXECUTE    0x2
 191 #define MH_DYLIB      0x6
 192 #define MH_BUNDLE     0x8
 193 #define MH_DYLIB_STUB 0x9
 194
 195 struct load_command {
 196     uint32_t cmd;
 197     uint32_t cmdsize;
 198 } _packed;
 199
 200 #define LC_REQ_DYLD           uint32_t(0x80000000)
 201
 202 #define LC_SEGMENT            uint32_t(0x01)
 203 #define LC_SYMTAB             uint32_t(0x02)
 204 #define LC_DYSYMTAB           uint32_t(0x0b)
 205 #define LC_LOAD_DYLIB         uint32_t(0x0c)
 206 #define LC_ID_DYLIB           uint32_t(0x0d)
 207 #define LC_SEGMENT_64         uint32_t(0x19)
 208 #define LC_UUID               uint32_t(0x1b)
 209 #define LC_CODE_SIGNATURE     uint32_t(0x1d)
 210 #define LC_SEGMENT_SPLIT_INFO uint32_t(0x1e)
 211 #define LC_REEXPORT_DYLIB     uint32_t(0x1f | LC_REQ_DYLD)
 212 #define LC_ENCRYPTION_INFO    uint32_t(0x21)
 213 #define LC_DYLD_INFO          uint32_t(0x22)
 214 #define LC_DYLD_INFO_ONLY     uint32_t(0x22 | LC_REQ_DYLD)
 215 #define LC_ENCRYPTION_INFO_64 uint32_t(0x2c)
 216
 217 struct dylib {
 218     uint32_t name;
 219     uint32_t timestamp;
 220     uint32_t current_version;
 221     uint32_t compatibility_version;
 222 } _packed;
 223
 224 struct dylib_command {
 225     uint32_t cmd;
 226     uint32_t cmdsize;
 227     struct dylib dylib;
 228 } _packed;
 229
 230 struct uuid_command {
 231     uint32_t cmd;
 232     uint32_t cmdsize;
 233     uint8_t uuid[16];
 234 } _packed;
 235
 236 struct symtab_command {
 237     uint32_t cmd;
 238     uint32_t cmdsize;
 239     uint32_t symoff;
 240     uint32_t nsyms;
 241     uint32_t stroff;
 242     uint32_t strsize;
 243 } _packed;
 244
 245 struct dyld_info_command {
 246     uint32_t cmd;
 247     uint32_t cmdsize;
 248     uint32_t rebase_off;
 249     uint32_t rebase_size;
 250     uint32_t bind_off;
 251     uint32_t bind_size;
 252     uint32_t weak_bind_off;
 253     uint32_t weak_bind_size;
 254     uint32_t lazy_bind_off;
 255     uint32_t lazy_bind_size;
 256     uint32_t export_off;
 257     uint32_t export_size;
 258 } _packed;
 259
 260 struct dysymtab_command {
 261     uint32_t cmd;
 262     uint32_t cmdsize;
 263     uint32_t ilocalsym;
 264     uint32_t nlocalsym;
 265     uint32_t iextdefsym;
 266     uint32_t nextdefsym;
 267     uint32_t iundefsym;
 268     uint32_t nundefsym;
 269     uint32_t tocoff;
 270     uint32_t ntoc;
 271     uint32_t modtaboff;
 272     uint32_t nmodtab;
 273     uint32_t extrefsymoff;
 274     uint32_t nextrefsyms;
 275     uint32_t indirectsymoff;
 276     uint32_t nindirectsyms;
 277     uint32_t extreloff;
 278     uint32_t nextrel;
 279     uint32_t locreloff;
 280     uint32_t nlocrel;
 281 } _packed;
 282
 283 struct dylib_table_of_contents {
 284     uint32_t symbol_index;
 285     uint32_t module_index;
 286 } _packed;
 287
 288 struct dylib_module {
 289     uint32_t module_name;
 290     uint32_t iextdefsym;
 291     uint32_t nextdefsym;
 292     uint32_t irefsym;
 293     uint32_t nrefsym;
 294     uint32_t ilocalsym;
 295     uint32_t nlocalsym;
 296     uint32_t iextrel;
 297     uint32_t nextrel;
 298     uint32_t iinit_iterm;
 299     uint32_t ninit_nterm;
 300     uint32_t objc_module_info_addr;
 301     uint32_t objc_module_info_size;
 302 } _packed;
 303
 304 struct dylib_reference {
 305     uint32_t isym:24;
 306     uint32_t flags:8;
 307 } _packed;
 308
 309 struct relocation_info {
 310     int32_t r_address;
 311     uint32_t r_symbolnum:24;
 312     uint32_t r_pcrel:1;
 313     uint32_t r_length:2;
 314     uint32_t r_extern:1;
 315     uint32_t r_type:4;
 316 } _packed;
 317
 318 struct nlist {
 319     union {
 320         char *n_name;
 321         int32_t n_strx;
 322     } n_un;
 323
 324     uint8_t n_type;
 325     uint8_t n_sect;
 326     uint8_t n_desc;
 327     uint32_t n_value;
 328 } _packed;
 329
 330 struct segment_command {
 331     uint32_t cmd;
 332     uint32_t cmdsize;
 333     char segname[16];
 334     uint32_t vmaddr;
 335     uint32_t vmsize;
 336     uint32_t fileoff;
 337     uint32_t filesize;
 338     uint32_t maxprot;
 339     uint32_t initprot;
 340     uint32_t nsects;
 341     uint32_t flags;
 342 } _packed;
 343
 344 struct segment_command_64 {
 345     uint32_t cmd;
 346     uint32_t cmdsize;
 347     char segname[16];
 348     uint64_t vmaddr;
 349     uint64_t vmsize;
 350     uint64_t fileoff;
 351     uint64_t filesize;
 352     uint32_t maxprot;
 353     uint32_t initprot;
 354     uint32_t nsects;
 355     uint32_t flags;
 356 } _packed;
 357
 358 struct section {
 359     char sectname[16];
 360     char segname[16];
 361     uint32_t addr;
 362     uint32_t size;
 363     uint32_t offset;
 364     uint32_t align;
 365     uint32_t reloff;
 366     uint32_t nreloc;
 367     uint32_t flags;
 368     uint32_t reserved1;
 369     uint32_t reserved2;
 370 } _packed;
 371
 372 struct section_64 {
 373     char sectname[16];
 374     char segname[16];
 375     uint64_t addr;
 376     uint64_t size;
 377     uint32_t offset;
 378     uint32_t align;
 379     uint32_t reloff;
 380     uint32_t nreloc;
 381     uint32_t flags;
 382     uint32_t reserved1;
 383     uint32_t reserved2;
 384 } _packed;
 385
 386 struct linkedit_data_command {
 387     uint32_t cmd;
 388     uint32_t cmdsize;
 389     uint32_t dataoff;
 390     uint32_t datasize;
 391 } _packed;
 392
 393 struct encryption_info_command {
 394     uint32_t cmd;
 395     uint32_t cmdsize;
 396     uint32_t cryptoff;
 397     uint32_t cryptsize;
 398     uint32_t cryptid;
 399 } _packed;
 400
 401 #define BIND_OPCODE_MASK                             0xf0
 402 #define BIND_IMMEDIATE_MASK                          0x0f
 403 #define BIND_OPCODE_DONE                             0x00
 404 #define BIND_OPCODE_SET_DYLIB_ORDINAL_IMM            0x10
 405 #define BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB           0x20
 406 #define BIND_OPCODE_SET_DYLIB_SPECIAL_IMM            0x30
 407 #define BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM    0x40
 408 #define BIND_OPCODE_SET_TYPE_IMM                     0x50
 409 #define BIND_OPCODE_SET_ADDEND_SLEB                  0x60
 410 #define BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB      0x70
 411 #define BIND_OPCODE_ADD_ADDR_ULEB                    0x80
 412 #define BIND_OPCODE_DO_BIND                          0x90
 413 #define BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB            0xa0
 414 #define BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED      0xb0
 415 #define BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB 0xc0
 416
 417 inline void get(std::streambuf &stream, void *data, size_t size) {
 418     _assert(stream.sgetn(static_cast<char *>(data), size) == size);
 419 }
 420
 421 inline void put(std::streambuf &stream, const void *data, size_t size) {
 422     _assert(stream.sputn(static_cast<const char *>(data), size) == size);
 423 }
 424
 425 inline void pad(std::streambuf &stream, size_t size) {
 426     char padding[size];
 427     memset(padding, 0, size);
 428     put(stream, padding, size);
 429 }
 430
 431 template <typename Type_>
 432 Type_ Align(Type_ value, size_t align) {
 433     value += align - 1;
 434     value /= align;
 435     value *= align;
 436     return value;
 437 }
 438
 439 static const uint8_t PageShift_(0x0c);
 440 static const uint32_t PageSize_(1 << PageShift_);
 441
 442 static inline uint16_t Swap_(uint16_t value) {
 443     return
 444         ((value >>  8) & 0x00ff) |
 445         ((value <<  8) & 0xff00);
 446 }
 447
 448 static inline uint32_t Swap_(uint32_t value) {
 449     value = ((value >>  8) & 0x00ff00ff) |
 450             ((value <<  8) & 0xff00ff00);
 451     value = ((value >> 16) & 0x0000ffff) |
 452             ((value << 16) & 0xffff0000);
 453     return value;
 454 }
 455
 456 static inline uint64_t Swap_(uint64_t value) {
 457     value = (value & 0x00000000ffffffff) << 32 | (value & 0xffffffff00000000) >> 32;
 458     value = (value & 0x0000ffff0000ffff) << 16 | (value & 0xffff0000ffff0000) >> 16;
 459     value = (value & 0x00ff00ff00ff00ff) << 8  | (value & 0xff00ff00ff00ff00) >> 8;
 460     return value;
 461 }
 462
 463 static inline int16_t Swap_(int16_t value) {
 464     return Swap_(static_cast<uint16_t>(value));
 465 }
 466
 467 static inline int32_t Swap_(int32_t value) {
 468     return Swap_(static_cast<uint32_t>(value));
 469 }
 470
 471 static inline int64_t Swap_(int64_t value) {
 472     return Swap_(static_cast<uint64_t>(value));
 473 }
 474
 475 static bool little_(true);
 476
 477 static inline uint16_t Swap(uint16_t value) {
 478     return little_ ? Swap_(value) : value;
 479 }
 480
 481 static inline uint32_t Swap(uint32_t value) {
 482     return little_ ? Swap_(value) : value;
 483 }
 484
 485 static inline uint64_t Swap(uint64_t value) {
 486     return little_ ? Swap_(value) : value;
 487 }
 488
 489 static inline int16_t Swap(int16_t value) {
 490     return Swap(static_cast<uint16_t>(value));
 491 }
 492
 493 static inline int32_t Swap(int32_t value) {
 494     return Swap(static_cast<uint32_t>(value));
 495 }
 496
 497 static inline int64_t Swap(int64_t value) {
 498     return Swap(static_cast<uint64_t>(value));
 499 }
 500
 501 template <typename Target_>
 502 class Pointer;
 503
 504 class Swapped {
 505   protected:
 506     bool swapped_;
 507
 508     Swapped() :
 509         swapped_(false)
 510     {
 511     }
 512
 513   public:
 514     Swapped(bool swapped) :
 515         swapped_(swapped)
 516     {
 517     }
 518
 519     template <typename Type_>
 520     Type_ Swap(Type_ value) const {
 521         return swapped_ ? Swap_(value) : value;
 522     }
 523 };
 524
 525 class Data :
 526     public Swapped
 527 {
 528   private:
 529     void *base_;
 530     size_t size_;
 531
 532   public:
 533     Data(void *base, size_t size) :
 534         base_(base),
 535         size_(size)
 536     {
 537     }
 538
 539     void *GetBase() const {
 540         return base_;
 541     }
 542
 543     size_t GetSize() const {
 544         return size_;
 545     }
 546 };
 547
 548 class MachHeader :
 549     public Data
 550 {
 551   private:
 552     bool bits64_;
 553
 554     struct mach_header *mach_header_;
 555     struct load_command *load_command_;
 556
 557   public:
 558     MachHeader(void *base, size_t size) :
 559         Data(base, size)
 560     {
 561         mach_header_ = (mach_header *) base;
 562
 563         switch (Swap(mach_header_->magic)) {
 564             case MH_CIGAM:
 565                 swapped_ = !swapped_;
 566             case MH_MAGIC:
 567                 bits64_ = false;
 568             break;
 569
 570             case MH_CIGAM_64:
 571                 swapped_ = !swapped_;
 572             case MH_MAGIC_64:
 573                 bits64_ = true;
 574             break;
 575
 576             default:
 577                 _assert(false);
 578         }
 579
 580         void *post = mach_header_ + 1;
 581         if (bits64_)
 582             post = (uint32_t *) post + 1;
 583         load_command_ = (struct load_command *) post;
 584
 585         _assert(
 586             Swap(mach_header_->filetype) == MH_EXECUTE ||
 587             Swap(mach_header_->filetype) == MH_DYLIB ||
 588             Swap(mach_header_->filetype) == MH_BUNDLE
 589         );
 590     }
 591
 592     bool Bits64() const {
 593         return bits64_;
 594     }
 595
 596     struct mach_header *operator ->() const {
 597         return mach_header_;
 598     }
 599
 600     operator struct mach_header *() const {
 601         return mach_header_;
 602     }
 603
 604     uint32_t GetCPUType() const {
 605         return Swap(mach_header_->cputype);
 606     }
 607
 608     uint32_t GetCPUSubtype() const {
 609         return Swap(mach_header_->cpusubtype) & 0xff;
 610     }
 611
 612     struct load_command *GetLoadCommand() const {
 613         return load_command_;
 614     }
 615
 616     std::vector<struct load_command *> GetLoadCommands() const {
 617         std::vector<struct load_command *> load_commands;
 618
 619         struct load_command *load_command = load_command_;
 620         for (uint32_t cmd = 0; cmd != Swap(mach_header_->ncmds); ++cmd) {
 621             load_commands.push_back(load_command);
 622             load_command = (struct load_command *) ((uint8_t *) load_command + Swap(load_command->cmdsize));
 623         }
 624
 625         return load_commands;
 626     }
 627
 628     std::vector<segment_command *> GetSegments(const char *segment_name) const {
 629         std::vector<struct segment_command *> segment_commands;
 630
 631         _foreach (load_command, GetLoadCommands()) {
 632             if (Swap(load_command->cmd) == LC_SEGMENT) {
 633                 segment_command *segment_command = reinterpret_cast<struct segment_command *>(load_command);
 634                 if (strncmp(segment_command->segname, segment_name, 16) == 0)
 635                     segment_commands.push_back(segment_command);
 636             }
 637         }
 638
 639         return segment_commands;
 640     }
 641
 642     std::vector<segment_command_64 *> GetSegments64(const char *segment_name) const {
 643         std::vector<struct segment_command_64 *> segment_commands;
 644
 645         _foreach (load_command, GetLoadCommands()) {
 646             if (Swap(load_command->cmd) == LC_SEGMENT_64) {
 647                 segment_command_64 *segment_command = reinterpret_cast<struct segment_command_64 *>(load_command);
 648                 if (strncmp(segment_command->segname, segment_name, 16) == 0)
 649                     segment_commands.push_back(segment_command);
 650             }
 651         }
 652
 653         return segment_commands;
 654     }
 655
 656     std::vector<section *> GetSections(const char *segment_name, const char *section_name) const {
 657         std::vector<section *> sections;
 658
 659         _foreach (segment, GetSegments(segment_name)) {
 660             section *section = (struct section *) (segment + 1);
 661
 662             uint32_t sect;
 663             for (sect = 0; sect != Swap(segment->nsects); ++sect) {
 664                 if (strncmp(section->sectname, section_name, 16) == 0)
 665                     sections.push_back(section);
 666                 ++section;
 667             }
 668         }
 669
 670         return sections;
 671     }
 672
 673     template <typename Target_>
 674     Pointer<Target_> GetPointer(uint32_t address, const char *segment_name = NULL) const {
 675         load_command *load_command = (struct load_command *) (mach_header_ + 1);
 676         uint32_t cmd;
 677
 678         for (cmd = 0; cmd != Swap(mach_header_->ncmds); ++cmd) {
 679             if (Swap(load_command->cmd) == LC_SEGMENT) {
 680                 segment_command *segment_command = (struct segment_command *) load_command;
 681                 if (segment_name != NULL && strncmp(segment_command->segname, segment_name, 16) != 0)
 682                     goto next_command;
 683
 684                 section *sections = (struct section *) (segment_command + 1);
 685
 686                 uint32_t sect;
 687                 for (sect = 0; sect != Swap(segment_command->nsects); ++sect) {
 688                     section *section = &sections[sect];
 689                     //printf("%s %u %p %p %u\n", segment_command->segname, sect, address, section->addr, section->size);
 690                     if (address >= Swap(section->addr) && address < Swap(section->addr) + Swap(section->size)) {
 691                         //printf("0x%.8x %s\n", address, segment_command->segname);
 692                         return Pointer<Target_>(this, reinterpret_cast<Target_ *>(address - Swap(section->addr) + Swap(section->offset) + (char *) mach_header_));
 693                     }
 694                 }
 695             }
 696
 697           next_command:
 698             load_command = (struct load_command *) ((char *) load_command + Swap(load_command->cmdsize));
 699         }
 700
 701         return Pointer<Target_>(this);
 702     }
 703
 704     template <typename Target_>
 705     Pointer<Target_> GetOffset(uint32_t offset) {
 706         return Pointer<Target_>(this, reinterpret_cast<Target_ *>(offset + (uint8_t *) mach_header_));
 707     }
 708 };
 709
 710 class FatMachHeader :
 711     public MachHeader
 712 {
 713   private:
 714     fat_arch *fat_arch_;
 715
 716   public:
 717     FatMachHeader(void *base, size_t size, fat_arch *fat_arch) :
 718         MachHeader(base, size),
 719         fat_arch_(fat_arch)
 720     {
 721     }
 722
 723     fat_arch *GetFatArch() const {
 724         return fat_arch_;
 725     }
 726 };
 727
 728 class FatHeader :
 729     public Data
 730 {
 731   private:
 732     fat_header *fat_header_;
 733     std::vector<FatMachHeader> mach_headers_;
 734
 735   public:
 736     FatHeader(void *base, size_t size) :
 737         Data(base, size)
 738     {
 739         fat_header_ = reinterpret_cast<struct fat_header *>(base);
 740
 741         if (Swap(fat_header_->magic) == FAT_CIGAM) {
 742             swapped_ = !swapped_;
 743             goto fat;
 744         } else if (Swap(fat_header_->magic) != FAT_MAGIC) {
 745             fat_header_ = NULL;
 746             mach_headers_.push_back(FatMachHeader(base, size, NULL));
 747         } else fat: {
 748             size_t fat_narch = Swap(fat_header_->nfat_arch);
 749             fat_arch *fat_arch = reinterpret_cast<struct fat_arch *>(fat_header_ + 1);
 750             size_t arch;
 751             for (arch = 0; arch != fat_narch; ++arch) {
 752                 uint32_t arch_offset = Swap(fat_arch->offset);
 753                 uint32_t arch_size = Swap(fat_arch->size);
 754                 mach_headers_.push_back(FatMachHeader((uint8_t *) base + arch_offset, arch_size, fat_arch));
 755                 ++fat_arch;
 756             }
 757         }
 758     }
 759
 760     std::vector<FatMachHeader> &GetMachHeaders() {
 761         return mach_headers_;
 762     }
 763
 764     bool IsFat() const {
 765         return fat_header_ != NULL;
 766     }
 767
 768     struct fat_header *operator ->() const {
 769         return fat_header_;
 770     }
 771
 772     operator struct fat_header *() const {
 773         return fat_header_;
 774     }
 775 };
 776
 777 template <typename Target_>
 778 class Pointer {
 779   private:
 780     const MachHeader *framework_;
 781     const Target_ *pointer_;
 782
 783   public:
 784     Pointer(const MachHeader *framework = NULL, const Target_ *pointer = NULL) :
 785         framework_(framework),
 786         pointer_(pointer)
 787     {
 788     }
 789
 790     operator const Target_ *() const {
 791         return pointer_;
 792     }
 793
 794     const Target_ *operator ->() const {
 795         return pointer_;
 796     }
 797
 798     Pointer<Target_> &operator ++() {
 799         ++pointer_;
 800         return *this;
 801     }
 802
 803     template <typename Value_>
 804     Value_ Swap(Value_ value) {
 805         return framework_->Swap(value);
 806     }
 807 };
 808
 809 #define CSMAGIC_REQUIREMENT            uint32_t(0xfade0c00)
 810 #define CSMAGIC_REQUIREMENTS           uint32_t(0xfade0c01)
 811 #define CSMAGIC_CODEDIRECTORY          uint32_t(0xfade0c02)
 812 #define CSMAGIC_EMBEDDED_SIGNATURE     uint32_t(0xfade0cc0)
 813 #define CSMAGIC_EMBEDDED_SIGNATURE_OLD uint32_t(0xfade0b02)
 814 #define CSMAGIC_EMBEDDED_ENTITLEMENTS  uint32_t(0xfade7171)
 815 #define CSMAGIC_DETACHED_SIGNATURE     uint32_t(0xfade0cc1)
 816 #define CSMAGIC_BLOBWRAPPER            uint32_t(0xfade0b01)
 817
 818 #define CSSLOT_CODEDIRECTORY uint32_t(0x00000)
 819 #define CSSLOT_INFOSLOT      uint32_t(0x00001)
 820 #define CSSLOT_REQUIREMENTS  uint32_t(0x00002)
 821 #define CSSLOT_RESOURCEDIR   uint32_t(0x00003)
 822 #define CSSLOT_APPLICATION   uint32_t(0x00004)
 823 #define CSSLOT_ENTITLEMENTS  uint32_t(0x00005)
 824
 825 #define CSSLOT_SIGNATURESLOT uint32_t(0x10000)
 826
 827 #define CS_HASHTYPE_SHA1 1
 828
 829 struct BlobIndex {
 830     uint32_t type;
 831     uint32_t offset;
 832 } _packed;
 833
 834 struct Blob {
 835     uint32_t magic;
 836     uint32_t length;
 837 } _packed;
 838
 839 struct SuperBlob {
 840     struct Blob blob;
 841     uint32_t count;
 842     struct BlobIndex index[];
 843 } _packed;
 844
 845 struct CodeDirectory {
 846     uint32_t version;
 847     uint32_t flags;
 848     uint32_t hashOffset;
 849     uint32_t identOffset;
 850     uint32_t nSpecialSlots;
 851     uint32_t nCodeSlots;
 852     uint32_t codeLimit;
 853     uint8_t hashSize;
 854     uint8_t hashType;
 855     uint8_t spare1;
 856     uint8_t pageSize;
 857     uint32_t spare2;
 858 } _packed;
 859
 860 extern "C" uint32_t hash(uint8_t *k, uint32_t length, uint32_t initval);
 861
 862 static void sha1(uint8_t *hash, const void *data, size_t size) {
 863     LDID_SHA1(static_cast<const uint8_t *>(data), size, hash);
 864 }
 865
 866 struct CodesignAllocation {
 867     FatMachHeader mach_header_;
 868     uint32_t offset_;
 869     uint32_t size_;
 870     uint32_t limit_;
 871     uint32_t alloc_;
 872     uint32_t align_;
 873
 874     CodesignAllocation(FatMachHeader mach_header, size_t offset, size_t size, size_t limit, size_t alloc, size_t align) :
 875         mach_header_(mach_header),
 876         offset_(offset),
 877         size_(size),
 878         limit_(limit),
 879         alloc_(alloc),
 880         align_(align)
 881     {
 882     }
 883 };
 884
 885 class File {
 886   private:
 887     int file_;
 888
 889   public:
 890     File() :
 891         file_(-1)
 892     {
 893     }
 894
 895     ~File() {
 896         if (file_ != -1)
 897             _syscall(close(file_));
 898     }
 899
 900     void open(const char *path, int flags) {
 901         _assert(file_ == -1);
 902         file_ = _syscall(::open(path, flags));
 903     }
 904
 905     int file() const {
 906         return file_;
 907     }
 908 };
 909
 910 class Map {
 911   private:
 912     File file_;
 913     void *data_;
 914     size_t size_;
 915
 916     void clear() {
 917         if (data_ == NULL)
 918             return;
 919         _syscall(munmap(data_, size_));
 920         data_ = NULL;
 921         size_ = 0;
 922     }
 923
 924   public:
 925     Map() :
 926         data_(NULL),
 927         size_(0)
 928     {
 929     }
 930
 931     Map(const std::string &path, int oflag, int pflag, int mflag) :
 932         Map()
 933     {
 934         open(path, oflag, pflag, mflag);
 935     }
 936
 937     Map(const std::string &path, bool edit) :
 938         Map()
 939     {
 940         open(path, edit);
 941     }
 942
 943     ~Map() {
 944         clear();
 945     }
 946
 947     bool empty() const {
 948         return data_ == NULL;
 949     }
 950
 951     void open(const std::string &path, int oflag, int pflag, int mflag) {
 952         clear();
 953
 954         file_.open(path.c_str(), oflag);
 955         int file(file_.file());
 956
 957         struct stat stat;
 958         _syscall(fstat(file, &stat));
 959         size_ = stat.st_size;
 960
 961         data_ = _syscall(mmap(NULL, size_, pflag, mflag, file, 0));
 962     }
 963
 964     void open(const std::string &path, bool edit) {
 965         if (edit)
 966             open(path, O_RDWR, PROT_READ | PROT_WRITE, MAP_SHARED);
 967         else
 968             open(path, O_RDONLY, PROT_READ, MAP_PRIVATE);
 969     }
 970
 971     void *data() const {
 972         return data_;
 973     }
 974
 975     size_t size() const {
 976         return size_;
 977     }
 978
 979     operator std::string() const {
 980         return std::string(static_cast<char *>(data_), size_);
 981     }
 982 };
 983
 984 namespace ldid {
 985
 986 static void Allocate(const void *idata, size_t isize, std::streambuf &output, const Functor<size_t (size_t)> &allocate, const Functor<size_t (std::streambuf &output, size_t, const std::string &, const char *)> &save) {
 987     FatHeader source(const_cast<void *>(idata), isize);
 988
 989     size_t offset(0);
 990     if (source.IsFat())
 991         offset += sizeof(fat_header) + sizeof(fat_arch) * source.Swap(source->nfat_arch);
 992
 993     std::vector<CodesignAllocation> allocations;
 994     _foreach (mach_header, source.GetMachHeaders()) {
 995         struct linkedit_data_command *signature(NULL);
 996         struct symtab_command *symtab(NULL);
 997
 998         _foreach (load_command, mach_header.GetLoadCommands()) {
 999             uint32_t cmd(mach_header.Swap(load_command->cmd));
1000             if (false);
1001             else if (cmd == LC_CODE_SIGNATURE)
1002                 signature = reinterpret_cast<struct linkedit_data_command *>(load_command);
1003             else if (cmd == LC_SYMTAB)
1004                 symtab = reinterpret_cast<struct symtab_command *>(load_command);
1005         }
1006
1007         size_t size;
1008         if (signature == NULL)
1009             size = mach_header.GetSize();
1010         else {
1011             size = mach_header.Swap(signature->dataoff);
1012             _assert(size <= mach_header.GetSize());
1013         }
1014
1015         if (symtab != NULL) {
1016             auto end(mach_header.Swap(symtab->stroff) + mach_header.Swap(symtab->strsize));
1017             _assert(end <= size);
1018             _assert(end >= size - 0x10);
1019             size = end;
1020         }
1021
1022         size_t alloc(allocate(size));
1023
1024         auto *fat_arch(mach_header.GetFatArch());
1025         uint32_t align(fat_arch == NULL ? 0 : source.Swap(fat_arch->align));
1026         offset = Align(offset, 1 << align);
1027
1028         uint32_t limit(size);
1029         if (alloc != 0)
1030             limit = Align(limit, 0x10);
1031
1032         allocations.push_back(CodesignAllocation(mach_header, offset, size, limit, alloc, align));
1033         offset += size + alloc;
1034         offset = Align(offset, 0x10);
1035     }
1036
1037     size_t position(0);
1038
1039     if (source.IsFat()) {
1040         fat_header fat_header;
1041         fat_header.magic = Swap(FAT_MAGIC);
1042         fat_header.nfat_arch = Swap(uint32_t(allocations.size()));
1043         put(output, &fat_header, sizeof(fat_header));
1044         position += sizeof(fat_header);
1045
1046         _foreach (allocation, allocations) {
1047             auto &mach_header(allocation.mach_header_);
1048
1049             fat_arch fat_arch;
1050             fat_arch.cputype = Swap(mach_header->cputype);
1051             fat_arch.cpusubtype = Swap(mach_header->cpusubtype);
1052             fat_arch.offset = Swap(allocation.offset_);
1053             fat_arch.size = Swap(allocation.limit_ + allocation.alloc_);
1054             fat_arch.align = Swap(allocation.align_);
1055             put(output, &fat_arch, sizeof(fat_arch));
1056             position += sizeof(fat_arch);
1057         }
1058     }
1059
1060     _foreach (allocation, allocations) {
1061         auto &mach_header(allocation.mach_header_);
1062
1063         pad(output, allocation.offset_ - position);
1064         position = allocation.offset_;
1065
1066         std::vector<std::string> commands;
1067
1068         _foreach (load_command, mach_header.GetLoadCommands()) {
1069             std::string copy(reinterpret_cast<const char *>(load_command), load_command->cmdsize);
1070
1071             switch (mach_header.Swap(load_command->cmd)) {
1072                 case LC_CODE_SIGNATURE:
1073                     continue;
1074                 break;
1075
1076                 case LC_SEGMENT: {
1077                     auto segment_command(reinterpret_cast<struct segment_command *>(&copy[0]));
1078                     if (strncmp(segment_command->segname, "__LINKEDIT", 16) != 0)
1079                         break;
1080                     size_t size(mach_header.Swap(allocation.limit_ + allocation.alloc_ - mach_header.Swap(segment_command->fileoff)));
1081                     segment_command->filesize = size;
1082                     segment_command->vmsize = Align(size, PageSize_);
1083                 } break;
1084
1085                 case LC_SEGMENT_64: {
1086                     auto segment_command(reinterpret_cast<struct segment_command_64 *>(&copy[0]));
1087                     if (strncmp(segment_command->segname, "__LINKEDIT", 16) != 0)
1088                         break;
1089                     size_t size(mach_header.Swap(allocation.limit_ + allocation.alloc_ - mach_header.Swap(segment_command->fileoff)));
1090                     segment_command->filesize = size;
1091                     segment_command->vmsize = Align(size, PageSize_);
1092                 } break;
1093             }
1094
1095             commands.push_back(copy);
1096         }
1097
1098         if (allocation.alloc_ != 0) {
1099             linkedit_data_command signature;
1100             signature.cmd = mach_header.Swap(LC_CODE_SIGNATURE);
1101             signature.cmdsize = mach_header.Swap(uint32_t(sizeof(signature)));
1102             signature.dataoff = mach_header.Swap(allocation.limit_);
1103             signature.datasize = mach_header.Swap(allocation.alloc_);
1104             commands.push_back(std::string(reinterpret_cast<const char *>(&signature), sizeof(signature)));
1105         }
1106
1107         size_t begin(position);
1108
1109         uint32_t after(0);
1110         _foreach(command, commands)
1111             after += command.size();
1112
1113         std::stringbuf altern;
1114
1115         struct mach_header header(*mach_header);
1116         header.ncmds = mach_header.Swap(uint32_t(commands.size()));
1117         header.sizeofcmds = mach_header.Swap(after);
1118         put(output, &header, sizeof(header));
1119         put(altern, &header, sizeof(header));
1120         position += sizeof(header);
1121
1122         if (mach_header.Bits64()) {
1123             auto pad(mach_header.Swap(uint32_t(0)));
1124             put(output, &pad, sizeof(pad));
1125             put(altern, &pad, sizeof(pad));
1126             position += sizeof(pad);
1127         }
1128
1129         _foreach(command, commands) {
1130             put(output, command.data(), command.size());
1131             put(altern, command.data(), command.size());
1132             position += command.size();
1133         }
1134
1135         uint32_t before(mach_header.Swap(mach_header->sizeofcmds));
1136         if (before > after) {
1137             pad(output, before - after);
1138             pad(altern, before - after);
1139             position += before - after;
1140         }
1141
1142         auto top(reinterpret_cast<char *>(mach_header.GetBase()));
1143
1144         std::string overlap(altern.str());
1145         overlap.append(top + overlap.size(), Align(overlap.size(), 0x1000) - overlap.size());
1146
1147         put(output, top + (position - begin), allocation.size_ - (position - begin));
1148         position = begin + allocation.size_;
1149
1150         pad(output, allocation.limit_ - allocation.size_);
1151         position += allocation.limit_ - allocation.size_;
1152
1153         size_t saved(save(output, allocation.limit_, overlap, top));
1154         if (allocation.alloc_ > saved)
1155             pad(output, allocation.alloc_ - saved);
1156         position += allocation.alloc_;
1157     }
1158 }
1159
1160 }
1161
1162 typedef std::map<uint32_t, std::string> Blobs;
1163
1164 static void insert(Blobs &blobs, uint32_t slot, const std::stringbuf &buffer) {
1165     auto value(buffer.str());
1166     std::swap(blobs[slot], value);
1167 }
1168
1169 static void insert(Blobs &blobs, uint32_t slot, uint32_t magic, const std::stringbuf &buffer) {
1170     auto value(buffer.str());
1171     Blob blob;
1172     blob.magic = Swap(magic);
1173     blob.length = Swap(uint32_t(sizeof(blob) + value.size()));
1174     value.insert(0, reinterpret_cast<char *>(&blob), sizeof(blob));
1175     std::swap(blobs[slot], value);
1176 }
1177
1178 static size_t put(std::streambuf &output, uint32_t magic, const Blobs &blobs) {
1179     size_t total(0);
1180     _foreach (blob, blobs)
1181         total += blob.second.size();
1182
1183     struct SuperBlob super;
1184     super.blob.magic = Swap(magic);
1185     super.blob.length = Swap(uint32_t(sizeof(SuperBlob) + blobs.size() * sizeof(BlobIndex) + total));
1186     super.count = Swap(uint32_t(blobs.size()));
1187     put(output, &super, sizeof(super));
1188
1189     size_t offset(sizeof(SuperBlob) + sizeof(BlobIndex) * blobs.size());
1190
1191     _foreach (blob, blobs) {
1192         BlobIndex index;
1193         index.type = Swap(blob.first);
1194         index.offset = Swap(uint32_t(offset));
1195         put(output, &index, sizeof(index));
1196         offset += blob.second.size();
1197     }
1198
1199     _foreach (blob, blobs)
1200         put(output, blob.second.data(), blob.second.size());
1201
1202     return offset;
1203 }
1204
1205 class Buffer {
1206   private:
1207     BIO *bio_;
1208
1209   public:
1210     Buffer(BIO *bio) :
1211         bio_(bio)
1212     {
1213         _assert(bio_ != NULL);
1214     }
1215
1216     Buffer() :
1217         bio_(BIO_new(BIO_s_mem()))
1218     {
1219     }
1220
1221     Buffer(const char *data, size_t size) :
1222         Buffer(BIO_new_mem_buf(const_cast<char *>(data), size))
1223     {
1224     }
1225
1226     Buffer(const std::string &data) :
1227         Buffer(data.data(), data.size())
1228     {
1229     }
1230
1231     Buffer(PKCS7 *pkcs) :
1232         Buffer()
1233     {
1234         _assert(i2d_PKCS7_bio(bio_, pkcs) != 0);
1235     }
1236
1237     ~Buffer() {
1238         BIO_free_all(bio_);
1239     }
1240
1241     operator BIO *() const {
1242         return bio_;
1243     }
1244
1245     explicit operator std::string() const {
1246         char *data;
1247         auto size(BIO_get_mem_data(bio_, &data));
1248         return std::string(data, size);
1249     }
1250 };
1251
1252 class Stuff {
1253   private:
1254     PKCS12 *value_;
1255     EVP_PKEY *key_;
1256     X509 *cert_;
1257     STACK_OF(X509) *ca_;
1258
1259   public:
1260     Stuff(BIO *bio) :
1261         value_(d2i_PKCS12_bio(bio, NULL)),
1262         ca_(NULL)
1263     {
1264         _assert(value_ != NULL);
1265         _assert(PKCS12_parse(value_, "", &key_, &cert_, &ca_) != 0);
1266         _assert(key_ != NULL);
1267         _assert(cert_ != NULL);
1268     }
1269
1270     Stuff(const std::string &data) :
1271         Stuff(Buffer(data))
1272     {
1273     }
1274
1275     ~Stuff() {
1276         sk_X509_pop_free(ca_, X509_free);
1277         X509_free(cert_);
1278         EVP_PKEY_free(key_);
1279         PKCS12_free(value_);
1280     }
1281
1282     operator PKCS12 *() const {
1283         return value_;
1284     }
1285
1286     operator EVP_PKEY *() const {
1287         return key_;
1288     }
1289
1290     operator X509 *() const {
1291         return cert_;
1292     }
1293
1294     operator STACK_OF(X509) *() const {
1295         return ca_;
1296     }
1297 };
1298
1299 class Signature {
1300   private:
1301     PKCS7 *value_;
1302
1303   public:
1304     Signature(const Stuff &stuff, const Buffer &data) :
1305         value_(PKCS7_sign(stuff, stuff, stuff, data, PKCS7_BINARY | PKCS7_DETACHED))
1306     {
1307         _assert(value_ != NULL);
1308     }
1309
1310     ~Signature() {
1311         PKCS7_free(value_);
1312     }
1313
1314     operator PKCS7 *() const {
1315         return value_;
1316     }
1317 };
1318
1319 class NullBuffer :
1320     public std::streambuf
1321 {
1322   public:
1323     virtual std::streamsize xsputn(const char_type *data, std::streamsize size) {
1324         return size;
1325     }
1326
1327     virtual int_type overflow(int_type next) {
1328         return next;
1329     }
1330 };
1331
1332 class HashBuffer :
1333     public std::streambuf
1334 {
1335   private:
1336     std::vector<char> &hash_;
1337     LDID_SHA1_CTX context_;
1338
1339   public:
1340     HashBuffer(std::vector<char> &hash) :
1341         hash_(hash)
1342     {
1343         LDID_SHA1_Init(&context_);
1344     }
1345
1346     ~HashBuffer() {
1347         hash_.resize(LDID_SHA1_DIGEST_LENGTH);
1348         LDID_SHA1_Final(reinterpret_cast<uint8_t *>(hash_.data()), &context_);
1349     }
1350
1351     virtual std::streamsize xsputn(const char_type *data, std::streamsize size) {
1352         LDID_SHA1_Update(&context_, data, size);
1353         return size;
1354     }
1355
1356     virtual int_type overflow(int_type next) {
1357         if (next == traits_type::eof())
1358             return sync();
1359         char value(next);
1360         xsputn(&value, 1);
1361         return next;
1362     }
1363 };
1364
1365 class HashProxy :
1366     public HashBuffer
1367 {
1368   private:
1369     std::streambuf &buffer_;
1370
1371   public:
1372     HashProxy(std::vector<char> &hash, std::streambuf &buffer) :
1373         HashBuffer(hash),
1374         buffer_(buffer)
1375     {
1376     }
1377
1378     virtual std::streamsize xsputn(const char_type *data, std::streamsize size) {
1379         _assert(HashBuffer::xsputn(data, size) == size);
1380         return buffer_.sputn(data, size);
1381     }
1382 };
1383
1384 static bool Starts(const std::string &lhs, const std::string &rhs) {
1385     return lhs.size() >= rhs.size() && lhs.compare(0, rhs.size(), rhs) == 0;
1386 }
1387
1388 class Split {
1389   public:
1390     std::string dir;
1391     std::string base;
1392
1393     Split(const std::string &path) {
1394         size_t slash(path.rfind('/'));
1395         if (slash == std::string::npos)
1396             base = path;
1397         else {
1398             dir = path.substr(0, slash + 1);
1399             base = path.substr(slash + 1);
1400         }
1401     }
1402 };
1403
1404 static void mkdir_p(const std::string &path) {
1405     if (path.empty())
1406         return;
1407 #ifdef __WIN32__
1408     if (_syscall(mkdir(path.c_str()), EEXIST) == -EEXIST)
1409         return;
1410 #else
1411     if (_syscall(mkdir(path.c_str(), 0755), EEXIST) == -EEXIST)
1412         return;
1413 #endif
1414     auto slash(path.rfind('/', path.size() - 1));
1415     if (slash == std::string::npos)
1416         return;
1417     mkdir_p(path.substr(0, slash));
1418 }
1419
1420 static std::string Temporary(std::filebuf &file, const Split &split) {
1421     std::string temp(split.dir + ".ldid." + split.base);
1422     mkdir_p(split.dir);
1423     _assert_(file.open(temp.c_str(), std::ios::out | std::ios::trunc | std::ios::binary) == &file, "open(): %s", temp.c_str());
1424     return temp;
1425 }
1426
1427 static void Commit(const std::string &path, const std::string &temp) {
1428     struct stat info;
1429     if (_syscall(stat(path.c_str(), &info), ENOENT) == 0) {
1430 #ifndef __WIN32__
1431         _syscall(chown(temp.c_str(), info.st_uid, info.st_gid));
1432 #endif
1433         _syscall(chmod(temp.c_str(), info.st_mode));
1434     }
1435
1436     _syscall(rename(temp.c_str(), path.c_str()));
1437 }
1438
1439 namespace ldid {
1440
1441 void Sign(const void *idata, size_t isize, std::streambuf &output, const std::string &identifier, const std::string &entitlements, const std::string &key, const Slots &slots) {
1442     Allocate(idata, isize, output, fun([&](size_t size) -> size_t {
1443         size_t alloc(sizeof(struct SuperBlob));
1444
1445         uint32_t special(0);
1446
1447         special = std::max(special, CSSLOT_REQUIREMENTS);
1448         alloc += sizeof(struct BlobIndex);
1449         alloc += 0xc;
1450
1451         if (!entitlements.empty()) {
1452             special = std::max(special, CSSLOT_ENTITLEMENTS);
1453             alloc += sizeof(struct BlobIndex);
1454             alloc += sizeof(struct Blob);
1455             alloc += entitlements.size();
1456         }
1457
1458         special = std::max(special, CSSLOT_CODEDIRECTORY);
1459         alloc += sizeof(struct BlobIndex);
1460         alloc += sizeof(struct Blob);
1461         alloc += sizeof(struct CodeDirectory);
1462         alloc += identifier.size() + 1;
1463
1464         if (!key.empty()) {
1465             alloc += sizeof(struct BlobIndex);
1466             alloc += sizeof(struct Blob);
1467             // XXX: this is just a "sufficiently large number"
1468             alloc += 0x3000;
1469         }
1470
1471         _foreach (slot, slots)
1472             special = std::max(special, slot.first);
1473
1474         uint32_t normal((size + PageSize_ - 1) / PageSize_);
1475         alloc = Align(alloc + (special + normal) * LDID_SHA1_DIGEST_LENGTH, 16);
1476         return alloc;
1477     }), fun([&](std::streambuf &output, size_t limit, const std::string &overlap, const char *top) -> size_t {
1478         Blobs blobs;
1479
1480         if (true) {
1481             std::stringbuf data;
1482
1483             Blobs requirements;
1484             put(data, CSMAGIC_REQUIREMENTS, requirements);
1485
1486             insert(blobs, CSSLOT_REQUIREMENTS, data);
1487         }
1488
1489         if (!entitlements.empty()) {
1490             std::stringbuf data;
1491             put(data, entitlements.data(), entitlements.size());
1492             insert(blobs, CSSLOT_ENTITLEMENTS, CSMAGIC_EMBEDDED_ENTITLEMENTS, data);
1493         }
1494
1495         if (true) {
1496             std::stringbuf data;
1497
1498             uint32_t special(0);
1499             _foreach (blob, blobs)
1500                 special = std::max(special, blob.first);
1501             _foreach (slot, slots)
1502                 special = std::max(special, slot.first);
1503             uint32_t normal((limit + PageSize_ - 1) / PageSize_);
1504
1505             CodeDirectory directory;
1506             directory.version = Swap(uint32_t(0x00020001));
1507             directory.flags = Swap(uint32_t(0));
1508             directory.hashOffset = Swap(uint32_t(sizeof(Blob) + sizeof(CodeDirectory) + identifier.size() + 1 + LDID_SHA1_DIGEST_LENGTH * special));
1509             directory.identOffset = Swap(uint32_t(sizeof(Blob) + sizeof(CodeDirectory)));
1510             directory.nSpecialSlots = Swap(special);
1511             directory.codeLimit = Swap(uint32_t(limit));
1512             directory.nCodeSlots = Swap(normal);
1513             directory.hashSize = LDID_SHA1_DIGEST_LENGTH;
1514             directory.hashType = CS_HASHTYPE_SHA1;
1515             directory.spare1 = 0x00;
1516             directory.pageSize = PageShift_;
1517             directory.spare2 = Swap(uint32_t(0));
1518             put(data, &directory, sizeof(directory));
1519
1520             put(data, identifier.c_str(), identifier.size() + 1);
1521
1522             uint8_t storage[special + normal][LDID_SHA1_DIGEST_LENGTH];
1523             uint8_t (*hashes)[LDID_SHA1_DIGEST_LENGTH] = storage + special;
1524
1525             memset(storage, 0, sizeof(*storage) * special);
1526
1527             _foreach (blob, blobs) {
1528                 auto local(reinterpret_cast<const Blob *>(&blob.second[0]));
1529                 sha1((uint8_t *) (hashes - blob.first), local, Swap(local->length));
1530             }
1531
1532             _foreach (slot, slots) {
1533                 _assert(sizeof(*hashes) == slot.second.size());
1534                 memcpy(hashes - slot.first, slot.second.data(), slot.second.size());
1535             }
1536
1537             if (normal != 1)
1538                 for (size_t i = 0; i != normal - 1; ++i)
1539                     sha1(hashes[i], (PageSize_ * i < overlap.size() ? overlap.data() : top) + PageSize_ * i, PageSize_);
1540             if (normal != 0)
1541                 sha1(hashes[normal - 1], top + PageSize_ * (normal - 1), ((limit - 1) % PageSize_) + 1);
1542
1543             put(data, storage, sizeof(storage));
1544
1545             insert(blobs, CSSLOT_CODEDIRECTORY, CSMAGIC_CODEDIRECTORY, data);
1546         }
1547
1548         if (!key.empty()) {
1549             std::stringbuf data;
1550             const std::string &sign(blobs[CSSLOT_CODEDIRECTORY]);
1551
1552             Stuff stuff(key);
1553             Buffer bio(sign);
1554
1555             Signature signature(stuff, sign);
1556             Buffer result(signature);
1557             std::string value(result);
1558             put(data, value.data(), value.size());
1559
1560             insert(blobs, CSSLOT_SIGNATURESLOT, CSMAGIC_BLOBWRAPPER, data);
1561         }
1562
1563         return put(output, CSMAGIC_EMBEDDED_SIGNATURE, blobs);
1564     }));
1565 }
1566
1567 static void Unsign(void *idata, size_t isize, std::streambuf &output) {
1568     Allocate(idata, isize, output, fun([](size_t size) -> size_t {
1569         return 0;
1570     }), fun([](std::streambuf &output, size_t limit, const std::string &overlap, const char *top) -> size_t {
1571         return 0;
1572     }));
1573 }
1574
1575 std::string DiskFolder::Path(const std::string &path) {
1576     return path_ + "/" + path;
1577 }
1578
1579 DiskFolder::DiskFolder(const std::string &path) :
1580     path_(path)
1581 {
1582 }
1583
1584 DiskFolder::~DiskFolder() {
1585     if (!std::uncaught_exception())
1586         for (const auto &commit : commit_)
1587             Commit(commit.first, commit.second);
1588 }
1589
1590 void DiskFolder::Find(const std::string &root, const std::string &base, const Functor<void (const std::string &, const Functor<void (const Functor<void (std::streambuf &, std::streambuf &)> &)> &)>&code) {
1591     std::string path(Path(root) + base);
1592
1593     DIR *dir(opendir(path.c_str()));
1594     _assert(dir != NULL);
1595     _scope({ _syscall(closedir(dir)); });
1596
1597     while (auto child = readdir(dir)) {
1598         std::string name(child->d_name);
1599         if (name == "." || name == "..")
1600             continue;
1601         if (Starts(name, ".ldid."))
1602             continue;
1603
1604         bool directory;
1605
1606 #ifdef __WIN32__
1607         struct stat info;
1608         _syscall(stat(path.c_str(), &info));
1609         if (false);
1610         else if (S_ISDIR(info.st_mode))
1611             directory = true;
1612         else if (S_ISREG(info.st_mode))
1613             directory = false;
1614         else
1615             _assert_(false, "st_mode=%x", info.st_mode);
1616 #else
1617         switch (child->d_type) {
1618             case DT_DIR:
1619                 directory = true;
1620                 break;
1621             case DT_REG:
1622                 directory = false;
1623                 break;
1624             default:
1625                 _assert_(false, "d_type=%u", child->d_type);
1626         }
1627 #endif
1628
1629         if (directory)
1630             Find(root, base + name + "/", code);
1631         else
1632             code(base + name, fun([&](const Functor<void (std::streambuf &, std::streambuf &)> &code) {
1633                 std::string access(root + base + name);
1634                 _assert_(Open(access, fun([&](std::streambuf &data) {
1635                     NullBuffer save;
1636                     code(data, save);
1637                 })), "open(): %s", access.c_str());
1638             }));
1639     }
1640 }
1641
1642 void DiskFolder::Save(const std::string &path, const Functor<void (std::streambuf &)> &code) {
1643     std::filebuf save;
1644     auto from(Path(path));
1645     commit_[from] = Temporary(save, from);
1646     code(save);
1647 }
1648
1649 bool DiskFolder::Open(const std::string &path, const Functor<void (std::streambuf &)> &code) {
1650     std::filebuf data;
1651     auto result(data.open(Path(path).c_str(), std::ios::binary | std::ios::in));
1652     if (result == NULL)
1653         return false;
1654     _assert(result == &data);
1655     code(data);
1656     return true;
1657 }
1658
1659 void DiskFolder::Find(const std::string &path, const Functor<void (const std::string &, const Functor<void (const Functor<void (std::streambuf &, std::streambuf &)> &)> &)>&code) {
1660     Find(path, "", code);
1661 }
1662
1663 SubFolder::SubFolder(Folder &parent, const std::string &path) :
1664     parent_(parent),
1665     path_(path)
1666 {
1667 }
1668
1669 void SubFolder::Save(const std::string &path, const Functor<void (std::streambuf &)> &code) {
1670     return parent_.Save(path_ + path, code);
1671 }
1672
1673 bool SubFolder::Open(const std::string &path, const Functor<void (std::streambuf &)> &code) {
1674     return parent_.Open(path_ + path, code);
1675 }
1676
1677 void SubFolder::Find(const std::string &path, const Functor<void (const std::string &, const Functor<void (const Functor<void (std::streambuf &, std::streambuf &)> &)> &)> &code) {
1678     return parent_.Find(path_ + path, code);
1679 }
1680
1681 UnionFolder::UnionFolder(Folder &parent) :
1682     parent_(parent)
1683 {
1684 }
1685
1686 void UnionFolder::Save(const std::string &path, const Functor<void (std::streambuf &)> &code) {
1687     return parent_.Save(path, code);
1688 }
1689
1690 bool UnionFolder::Open(const std::string &path, const Functor<void (std::streambuf &)> &code) {
1691     auto file(files_.find(path));
1692     if (file == files_.end())
1693         return parent_.Open(path, code);
1694
1695     auto &data(file->second);
1696     data.pubseekpos(0, std::ios::in);
1697     code(data);
1698     return true;
1699 }
1700
1701 void UnionFolder::Find(const std::string &path, const Functor<void (const std::string &, const Functor<void (const Functor<void (std::streambuf &, std::streambuf &)> &)> &)> &code) {
1702     parent_.Find(path, fun([&](const std::string &name, const Functor<void (const Functor<void (std::streambuf &, std::streambuf &)> &)> &save) {
1703         if (files_.find(name) == files_.end())
1704             code(name, save);
1705     }));
1706
1707     for (auto &file : files_)
1708         code(file.first, fun([&](const Functor<void (std::streambuf &, std::streambuf &)> &code) {
1709             parent_.Save(file.first, fun([&](std::streambuf &save) {
1710                 file.second.pubseekpos(0, std::ios::in);
1711                 code(file.second, save);
1712             }));
1713         }));
1714 }
1715
1716 static size_t copy(std::streambuf &source, std::streambuf &target) {
1717     size_t total(0);
1718     for (;;) {
1719         char data[4096];
1720         size_t writ(source.sgetn(data, sizeof(data)));
1721         if (writ == 0)
1722             break;
1723         _assert(target.sputn(data, writ) == writ);
1724         total += writ;
1725     }
1726     return total;
1727 }
1728
1729 static plist_t plist(const std::string &data) {
1730     plist_t plist(NULL);
1731     if (Starts(data, "bplist00"))
1732         plist_from_bin(data.data(), data.size(), &plist);
1733     else
1734         plist_from_xml(data.data(), data.size(), &plist);
1735     _assert(plist != NULL);
1736     return plist;
1737 }
1738
1739 static void plist_d(std::streambuf &buffer, const Functor<void (plist_t)> &code) {
1740     std::stringbuf data;
1741     copy(buffer, data);
1742     auto node(plist(data.str()));
1743     _scope({ plist_free(node); });
1744     _assert(plist_get_node_type(node) == PLIST_DICT);
1745     code(node);
1746 }
1747
1748 static std::string plist_s(plist_t node) {
1749     _assert(node != NULL);
1750     _assert(plist_get_node_type(node) == PLIST_STRING);
1751     char *data;
1752     plist_get_string_val(node, &data);
1753     _scope({ free(data); });
1754     return data;
1755 }
1756
1757 enum Mode {
1758     NoMode,
1759     OptionalMode,
1760     OmitMode,
1761     NestedMode,
1762     TopMode,
1763 };
1764
1765 class Expression {
1766   private:
1767     regex_t regex_;
1768
1769   public:
1770     Expression(const std::string &code) {
1771         _assert_(regcomp(&regex_, code.c_str(), REG_EXTENDED | REG_NOSUB) == 0, "regcomp()");
1772     }
1773
1774     ~Expression() {
1775         regfree(&regex_);
1776     }
1777
1778     bool operator ()(const std::string &data) const {
1779         auto value(regexec(&regex_, data.c_str(), 0, NULL, 0));
1780         if (value == REG_NOMATCH)
1781             return false;
1782         _assert_(value == 0, "regexec()");
1783         return true;
1784     }
1785 };
1786
1787 struct Rule {
1788     unsigned weight_;
1789     Mode mode_;
1790     std::string code_;
1791
1792     mutable std::auto_ptr<Expression> regex_;
1793
1794     Rule(unsigned weight, Mode mode, const std::string &code) :
1795         weight_(weight),
1796         mode_(mode),
1797         code_(code)
1798     {
1799     }
1800
1801     Rule(const Rule &rhs) :
1802         weight_(rhs.weight_),
1803         mode_(rhs.mode_),
1804         code_(rhs.code_)
1805     {
1806     }
1807
1808     void Compile() const {
1809         regex_.reset(new Expression(code_));
1810     }
1811
1812     bool operator ()(const std::string &data) const {
1813         _assert(regex_.get() != NULL);
1814         return (*regex_)(data);
1815     }
1816
1817     bool operator <(const Rule &rhs) const {
1818         if (weight_ > rhs.weight_)
1819             return true;
1820         if (weight_ < rhs.weight_)
1821             return false;
1822         return mode_ > rhs.mode_;
1823     }
1824 };
1825
1826 struct RuleCode {
1827     bool operator ()(const Rule *lhs, const Rule *rhs) const {
1828         return lhs->code_ < rhs->code_;
1829     }
1830 };
1831
1832 std::string Bundle(const std::string &root, Folder &folder, const std::string &key, std::map<std::string, std::vector<char>> &remote, const std::string &entitlements) {
1833     std::string executable;
1834     std::string identifier;
1835
1836     static const std::string info("Info.plist");
1837
1838     _assert_(folder.Open(info, fun([&](std::streambuf &buffer) {
1839         plist_d(buffer, fun([&](plist_t node) {
1840             executable = plist_s(plist_dict_get_item(node, "CFBundleExecutable"));
1841             identifier = plist_s(plist_dict_get_item(node, "CFBundleIdentifier"));
1842         }));
1843     })), "open(): Info.plist");
1844
1845     std::map<std::string, std::multiset<Rule>> versions;
1846
1847     auto &rules1(versions[""]);
1848     auto &rules2(versions["2"]);
1849
1850     static const std::string signature("_CodeSignature/CodeResources");
1851
1852     folder.Open(signature, fun([&](std::streambuf &buffer) {
1853         plist_d(buffer, fun([&](plist_t node) {
1854             // XXX: maybe attempt to preserve existing rules
1855         }));
1856     }));
1857
1858     if (true) {
1859         rules1.insert(Rule{1, NoMode, "^"});
1860         rules1.insert(Rule{10000, OmitMode, "^(Frameworks/[^/]+\\.framework/|PlugIns/[^/]+\\.appex/|PlugIns/[^/]+\\.appex/Frameworks/[^/]+\\.framework/|())SC_Info/[^/]+\\.(sinf|supf|supp)$"});
1861         rules1.insert(Rule{1000, OptionalMode, "^.*\\.lproj/"});
1862         rules1.insert(Rule{1100, OmitMode, "^.*\\.lproj/locversion.plist$"});
1863         rules1.insert(Rule{10000, OmitMode, "^Watch/[^/]+\\.app/(Frameworks/[^/]+\\.framework/|PlugIns/[^/]+\\.appex/|PlugIns/[^/]+\\.appex/Frameworks/[^/]+\\.framework/)SC_Info/[^/]+\\.(sinf|supf|supp)$"});
1864         rules1.insert(Rule{1, NoMode, "^version.plist$"});
1865     }
1866
1867     if (true) {
1868         rules2.insert(Rule{11, NoMode, ".*\\.dSYM($|/)"});
1869         rules2.insert(Rule{20, NoMode, "^"});
1870         rules2.insert(Rule{2000, OmitMode, "^(.*/)?\\.DS_Store$"});
1871         rules2.insert(Rule{10000, OmitMode, "^(Frameworks/[^/]+\\.framework/|PlugIns/[^/]+\\.appex/|PlugIns/[^/]+\\.appex/Frameworks/[^/]+\\.framework/|())SC_Info/[^/]+\\.(sinf|supf|supp)$"});
1872         rules2.insert(Rule{10, NestedMode, "^(Frameworks|SharedFrameworks|PlugIns|Plug-ins|XPCServices|Helpers|MacOS|Library/(Automator|Spotlight|LoginItems))/"});
1873         rules2.insert(Rule{1, NoMode, "^.*"});
1874         rules2.insert(Rule{1000, OptionalMode, "^.*\\.lproj/"});
1875         rules2.insert(Rule{1100, OmitMode, "^.*\\.lproj/locversion.plist$"});
1876         rules2.insert(Rule{20, OmitMode, "^Info\\.plist$"});
1877         rules2.insert(Rule{20, OmitMode, "^PkgInfo$"});
1878         rules2.insert(Rule{10000, OmitMode, "^Watch/[^/]+\\.app/(Frameworks/[^/]+\\.framework/|PlugIns/[^/]+\\.appex/|PlugIns/[^/]+\\.appex/Frameworks/[^/]+\\.framework/)SC_Info/[^/]+\\.(sinf|supf|supp)$"});
1879         rules2.insert(Rule{10, NestedMode, "^[^/]+$"});
1880         rules2.insert(Rule{20, NoMode, "^embedded\\.provisionprofile$"});
1881         rules2.insert(Rule{20, NoMode, "^version\\.plist$"});
1882     }
1883
1884     std::map<std::string, std::vector<char>> local;
1885
1886     static Expression nested("^PlugIns/[^/]*\\.appex/Info\\.plist$");
1887
1888     folder.Find("", fun([&](const std::string &name, const Functor<void (const Functor<void (std::streambuf &, std::streambuf &)> &)> &code) {
1889         if (!nested(name))
1890             return;
1891         auto bundle(root + Split(name).dir);
1892         SubFolder subfolder(folder, bundle);
1893         Bundle(bundle, subfolder, key, local, "");
1894     }));
1895
1896     folder.Find("", fun([&](const std::string &name, const Functor<void (const Functor<void (std::streambuf &, std::streambuf &)> &)> &code) {
1897         if (name == executable || name == signature)
1898             return;
1899
1900         auto &hash(local[name]);
1901         if (!hash.empty())
1902             return;
1903
1904         code(fun([&](std::streambuf &data, std::streambuf &save) {
1905             HashProxy proxy(hash, save);
1906             copy(data, proxy);
1907         }));
1908
1909         _assert(hash.size() == LDID_SHA1_DIGEST_LENGTH);
1910     }));
1911
1912     auto plist(plist_new_dict());
1913     _scope({ plist_free(plist); });
1914
1915     for (const auto &version : versions) {
1916         auto files(plist_new_dict());
1917         plist_dict_set_item(plist, ("files" + version.first).c_str(), files);
1918
1919         for (const auto &rule : version.second)
1920             rule.Compile();
1921
1922         for (const auto &hash : local)
1923             for (const auto &rule : version.second)
1924                 if (rule(hash.first)) {
1925                     if (rule.mode_ == NoMode)
1926                         plist_dict_set_item(files, hash.first.c_str(), plist_new_data(hash.second.data(), hash.second.size()));
1927                     else if (rule.mode_ == OptionalMode) {
1928                         auto entry(plist_new_dict());
1929                         plist_dict_set_item(entry, "hash", plist_new_data(hash.second.data(), hash.second.size()));
1930                         plist_dict_set_item(entry, "optional", plist_new_bool(true));
1931                         plist_dict_set_item(files, hash.first.c_str(), entry);
1932                     }
1933
1934                     break;
1935                 }
1936     }
1937
1938     for (const auto &version : versions) {
1939         auto rules(plist_new_dict());
1940         plist_dict_set_item(plist, ("rules" + version.first).c_str(), rules);
1941
1942         std::multiset<const Rule *, RuleCode> ordered;
1943         for (const auto &rule : version.second)
1944             ordered.insert(&rule);
1945
1946         for (const auto &rule : ordered)
1947             if (rule->weight_ == 1 && rule->mode_ == NoMode)
1948                 plist_dict_set_item(rules, rule->code_.c_str(), plist_new_bool(true));
1949             else {
1950                 auto entry(plist_new_dict());
1951                 plist_dict_set_item(rules, rule->code_.c_str(), entry);
1952
1953                 switch (rule->mode_) {
1954                     case NoMode:
1955                         break;
1956                     case OmitMode:
1957                         plist_dict_set_item(entry, "omit", plist_new_bool(true));
1958                         break;
1959                     case OptionalMode:
1960                         plist_dict_set_item(entry, "optional", plist_new_bool(true));
1961                         break;
1962                     case NestedMode:
1963                         plist_dict_set_item(entry, "nested", plist_new_bool(true));
1964                         break;
1965                     case TopMode:
1966                         plist_dict_set_item(entry, "top", plist_new_bool(true));
1967                         break;
1968                 }
1969
1970                 if (rule->weight_ >= 10000)
1971                     plist_dict_set_item(entry, "weight", plist_new_uint(rule->weight_));
1972                 else if (rule->weight_ != 1)
1973                     plist_dict_set_item(entry, "weight", plist_new_real(rule->weight_));
1974             }
1975     }
1976
1977     folder.Save(signature, fun([&](std::streambuf &save) {
1978         HashProxy proxy(local[signature], save);
1979         char *xml(NULL);
1980         uint32_t size;
1981         plist_to_xml(plist, &xml, &size);
1982         _scope({ free(xml); });
1983         put(proxy, xml, size);
1984     }));
1985
1986     folder.Open(executable, fun([&](std::streambuf &buffer) {
1987         // XXX: this is a miserable fail
1988         std::stringbuf temp;
1989         copy(buffer, temp);
1990         auto data(temp.str());
1991
1992         folder.Save(executable, fun([&](std::streambuf &save) {
1993             Slots slots;
1994             slots[1] = local.at(info);
1995             slots[3] = local.at(signature);
1996
1997             HashProxy proxy(local[executable], save);
1998             Sign(data.data(), data.size(), proxy, identifier, entitlements, key, slots);
1999         }));
2000     }));
2001
2002     for (const auto &hash : local)
2003         remote[root + hash.first] = hash.second;
2004
2005     return executable;
2006 }
2007
2008 }
2009
2010 int main(int argc, char *argv[]) {
2011     OpenSSL_add_all_algorithms();
2012
2013     union {
2014         uint16_t word;
2015         uint8_t byte[2];
2016     } endian = {1};
2017
2018     little_ = endian.byte[0];
2019
2020     bool flag_r(false);
2021     bool flag_e(false);
2022
2023     bool flag_T(false);
2024
2025     bool flag_S(false);
2026     bool flag_s(false);
2027
2028     bool flag_D(false);
2029
2030     bool flag_A(false);
2031     bool flag_a(false);
2032
2033     uint32_t flag_CPUType(_not(uint32_t));
2034     uint32_t flag_CPUSubtype(_not(uint32_t));
2035
2036     const char *flag_I(NULL);
2037
2038     bool timeh(false);
2039     uint32_t timev(0);
2040
2041     Map entitlements;
2042     Map key;
2043     ldid::Slots slots;
2044
2045     std::vector<std::string> files;
2046
2047     if (argc == 1) {
2048         fprintf(stderr, "usage: %s -S[entitlements.xml] <binary>\n", argv[0]);
2049         fprintf(stderr, "   %s -e MobileSafari\n", argv[0]);
2050         fprintf(stderr, "   %s -S cat\n", argv[0]);
2051         fprintf(stderr, "   %s -Stfp.xml gdb\n", argv[0]);
2052         exit(0);
2053     }
2054
2055     for (int argi(1); argi != argc; ++argi)
2056         if (argv[argi][0] != '-')
2057             files.push_back(argv[argi]);
2058         else switch (argv[argi][1]) {
2059             case 'r':
2060                 _assert(!flag_s);
2061                 _assert(!flag_S);
2062                 flag_r = true;
2063             break;
2064
2065             case 'e': flag_e = true; break;
2066
2067             case 'E': {
2068                 const char *slot = argv[argi] + 2;
2069                 const char *colon = strchr(slot, ':');
2070                 _assert(colon != NULL);
2071                 Map file(colon + 1, O_RDONLY, PROT_READ, MAP_PRIVATE);
2072                 char *arge;
2073                 unsigned number(strtoul(slot, &arge, 0));
2074                 _assert(arge == colon);
2075                 std::vector<char> &hash(slots[number]);
2076                 hash.resize(LDID_SHA1_DIGEST_LENGTH);
2077                 sha1(reinterpret_cast<uint8_t *>(hash.data()), file.data(), file.size());
2078             } break;
2079
2080             case 'D': flag_D = true; break;
2081
2082             case 'a': flag_a = true; break;
2083
2084             case 'A':
2085                 _assert(!flag_A);
2086                 flag_A = true;
2087                 if (argv[argi][2] != '\0') {
2088                     const char *cpu = argv[argi] + 2;
2089                     const char *colon = strchr(cpu, ':');
2090                     _assert(colon != NULL);
2091                     char *arge;
2092                     flag_CPUType = strtoul(cpu, &arge, 0);
2093                     _assert(arge == colon);
2094                     flag_CPUSubtype = strtoul(colon + 1, &arge, 0);
2095                     _assert(arge == argv[argi] + strlen(argv[argi]));
2096                 }
2097             break;
2098
2099             case 's':
2100                 _assert(!flag_r);
2101                 _assert(!flag_S);
2102                 flag_s = true;
2103             break;
2104
2105             case 'S':
2106                 _assert(!flag_r);
2107                 _assert(!flag_s);
2108                 flag_S = true;
2109                 if (argv[argi][2] != '\0') {
2110                     const char *xml = argv[argi] + 2;
2111                     entitlements.open(xml, O_RDONLY, PROT_READ, MAP_PRIVATE);
2112                 }
2113             break;
2114
2115             case 'K':
2116                 key.open(argv[argi] + 2, O_RDONLY, PROT_READ, MAP_PRIVATE);
2117             break;
2118
2119             case 'T': {
2120                 flag_T = true;
2121                 if (argv[argi][2] == '-')
2122                     timeh = true;
2123                 else {
2124                     char *arge;
2125                     timev = strtoul(argv[argi] + 2, &arge, 0);
2126                     _assert(arge == argv[argi] + strlen(argv[argi]));
2127                 }
2128             } break;
2129
2130             case 'I': {
2131                 flag_I = argv[argi] + 2;
2132             } break;
2133
2134             default:
2135                 goto usage;
2136             break;
2137         }
2138
2139     _assert(flag_S || key.empty());
2140     _assert(flag_S || flag_I == NULL);
2141
2142     if (files.empty()) usage: {
2143         exit(0);
2144     }
2145
2146     size_t filei(0), filee(0);
2147     _foreach (file, files) try {
2148         std::string path(file);
2149
2150         struct stat info;
2151         _syscall(stat(path.c_str(), &info));
2152
2153         if (S_ISDIR(info.st_mode)) {
2154             _assert(!flag_r);
2155             ldid::DiskFolder folder(path);
2156             std::map<std::string, std::vector<char>> hashes;
2157             path += "/" + Bundle("", folder, key, hashes, entitlements);
2158         } else if (flag_S || flag_r) {
2159             Map input(path, O_RDONLY, PROT_READ, MAP_PRIVATE);
2160
2161             std::filebuf output;
2162             Split split(path);
2163             auto temp(Temporary(output, split));
2164
2165             if (flag_r)
2166                 ldid::Unsign(input.data(), input.size(), output);
2167             else {
2168                 std::string identifier(flag_I ?: split.base.c_str());
2169                 ldid::Sign(input.data(), input.size(), output, identifier, entitlements, key, slots);
2170             }
2171
2172             Commit(path, temp);
2173         }
2174
2175         Map mapping(path, flag_T || flag_s);
2176         FatHeader fat_header(mapping.data(), mapping.size());
2177
2178         _foreach (mach_header, fat_header.GetMachHeaders()) {
2179             struct linkedit_data_command *signature(NULL);
2180             struct encryption_info_command *encryption(NULL);
2181
2182             if (flag_A) {
2183                 if (mach_header.GetCPUType() != flag_CPUType)
2184                     continue;
2185                 if (mach_header.GetCPUSubtype() != flag_CPUSubtype)
2186                     continue;
2187             }
2188
2189             if (flag_a)
2190                 printf("cpu=0x%x:0x%x\n", mach_header.GetCPUType(), mach_header.GetCPUSubtype());
2191
2192             _foreach (load_command, mach_header.GetLoadCommands()) {
2193                 uint32_t cmd(mach_header.Swap(load_command->cmd));
2194
2195                 if (false);
2196                 else if (cmd == LC_CODE_SIGNATURE)
2197                     signature = reinterpret_cast<struct linkedit_data_command *>(load_command);
2198                 else if (cmd == LC_ENCRYPTION_INFO || cmd == LC_ENCRYPTION_INFO_64)
2199                     encryption = reinterpret_cast<struct encryption_info_command *>(load_command);
2200                 else if (cmd == LC_ID_DYLIB) {
2201                     volatile struct dylib_command *dylib_command(reinterpret_cast<struct dylib_command *>(load_command));
2202
2203                     if (flag_T) {
2204                         uint32_t timed;
2205
2206                         if (!timeh)
2207                             timed = timev;
2208                         else {
2209                             dylib_command->dylib.timestamp = 0;
2210                             timed = hash(reinterpret_cast<uint8_t *>(mach_header.GetBase()), mach_header.GetSize(), timev);
2211                         }
2212
2213                         dylib_command->dylib.timestamp = mach_header.Swap(timed);
2214                     }
2215                 }
2216             }
2217
2218             if (flag_D) {
2219                 _assert(encryption != NULL);
2220                 encryption->cryptid = mach_header.Swap(0);
2221             }
2222
2223             if (flag_e) {
2224                 _assert(signature != NULL);
2225
2226                 uint32_t data = mach_header.Swap(signature->dataoff);
2227
2228                 uint8_t *top = reinterpret_cast<uint8_t *>(mach_header.GetBase());
2229                 uint8_t *blob = top + data;
2230                 struct SuperBlob *super = reinterpret_cast<struct SuperBlob *>(blob);
2231
2232                 for (size_t index(0); index != Swap(super->count); ++index)
2233                     if (Swap(super->index[index].type) == CSSLOT_ENTITLEMENTS) {
2234                         uint32_t begin = Swap(super->index[index].offset);
2235                         struct Blob *entitlements = reinterpret_cast<struct Blob *>(blob + begin);
2236                         fwrite(entitlements + 1, 1, Swap(entitlements->length) - sizeof(*entitlements), stdout);
2237                     }
2238             }
2239
2240             if (flag_s) {
2241                 _assert(signature != NULL);
2242
2243                 uint32_t data = mach_header.Swap(signature->dataoff);
2244
2245                 uint8_t *top = reinterpret_cast<uint8_t *>(mach_header.GetBase());
2246                 uint8_t *blob = top + data;
2247                 struct SuperBlob *super = reinterpret_cast<struct SuperBlob *>(blob);
2248
2249                 for (size_t index(0); index != Swap(super->count); ++index)
2250                     if (Swap(super->index[index].type) == CSSLOT_CODEDIRECTORY) {
2251                         uint32_t begin = Swap(super->index[index].offset);
2252                         struct CodeDirectory *directory = reinterpret_cast<struct CodeDirectory *>(blob + begin);
2253
2254                         uint8_t (*hashes)[LDID_SHA1_DIGEST_LENGTH] = reinterpret_cast<uint8_t (*)[LDID_SHA1_DIGEST_LENGTH]>(blob + begin + Swap(directory->hashOffset));
2255                         uint32_t pages = Swap(directory->nCodeSlots);
2256
2257                         if (pages != 1)
2258                             for (size_t i = 0; i != pages - 1; ++i)
2259                                 sha1(hashes[i], top + PageSize_ * i, PageSize_);
2260                         if (pages != 0)
2261                             sha1(hashes[pages - 1], top + PageSize_ * (pages - 1), ((data - 1) % PageSize_) + 1);
2262                     }
2263             }
2264         }
2265
2266         ++filei;
2267     } catch (const char *) {
2268         ++filee;
2269         ++filei;
2270     }
2271
2272     return filee;
2273 }