[ldid.git] / ldid.cpp

/* JocStrap - Java/Objective-C Bootstrap
 * Copyright (C) 2007  Jay Freeman (saurik)
*/

/*
 *        Redistribution and use in source and binary
 * forms, with or without modification, are permitted
 * provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the
 *    above copyright notice, this list of conditions
 *    and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the
 *    above copyright notice, this list of conditions
 *    and the following disclaimer in the documentation
 *    and/or other materials provided with the
 *    distribution.
 * 3. The name of the author may not be used to endorse
 *    or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include "minimal/stdlib.h"
#include "minimal/mapping.h"

#include "sha1.h"

#include <cstring>
#include <string>
#include <vector>

#include <sys/wait.h>

struct fat_header {
    uint32_t magic;
    uint32_t nfat_arch;
};

#define FAT_MAGIC 0xcafebabe
#define FAT_CIGAM 0xbebafeca

struct fat_arch {
    uint32_t cputype;
    uint32_t cpusubtype;
    uint32_t offset;
    uint32_t size;
    uint32_t align;
};

struct mach_header {
    uint32_t magic;
    uint32_t cputype;
    uint32_t cpusubtype;
    uint32_t filetype;
    uint32_t ncmds;
    uint32_t sizeofcmds;
    uint32_t flags;
};

#define MH_MAGIC 0xfeedface
#define MH_CIGAM 0xcefaedfe

#define MH_EXECUTE 0x2
#define MH_DYLIB   0x6
#define MH_BUNDLE  0x8

struct load_command {
    uint32_t cmd;
    uint32_t cmdsize;
};

#define LC_REQ_DYLD  0x80000000

#define LC_LOAD_DYLIB      0x0c
#define LC_ID_DYLIB        0x0d
#define LC_UUID            0x1b
#define LC_CODE_SIGNATURE  0x1d
#define LC_REEXPORT_DYLIB (0x1f | LC_REQ_DYLD)

struct dylib {
    uint32_t name;
    uint32_t timestamp;
    uint32_t current_version;
    uint32_t compatibility_version;
};

struct dylib_command {
    uint32_t cmd;
    uint32_t cmdsize;
    struct dylib dylib;
};

struct uuid_command {
    uint32_t cmd;
    uint32_t cmdsize;
    uint8_t uuid[16];
};

struct linkedit_data_command {
    uint32_t cmd;
    uint32_t cmdsize;
    uint32_t dataoff;
    uint32_t datasize;
};

uint16_t Swap_(uint16_t value) {
    return
        ((value >>  8) & 0x00ff) |
        ((value <<  8) & 0xff00);
}

uint32_t Swap_(uint32_t value) {
    value = ((value >>  8) & 0x00ff00ff) |
            ((value <<  8) & 0xff00ff00);
    value = ((value >> 16) & 0x0000ffff) |
            ((value << 16) & 0xffff0000);
    return value;
}

int16_t Swap_(int16_t value) {
    return Swap_(static_cast<uint16_t>(value));
}

int32_t Swap_(int32_t value) {
    return Swap_(static_cast<uint32_t>(value));
}

uint16_t Swap(uint16_t value) {
    return true ? Swap_(value) : value;
}

uint32_t Swap(uint32_t value) {
    return true ? Swap_(value) : value;
}

int16_t Swap(int16_t value) {
    return Swap(static_cast<uint16_t>(value));
}

int32_t Swap(int32_t value) {
    return Swap(static_cast<uint32_t>(value));
}

class Framework {
  private:
    void *base_;
    size_t size_;
    mach_header *mach_header_;
    bool swapped_;

  public:
    uint16_t Swap(uint16_t value) const {
        return swapped_ ? Swap_(value) : value;
    }

    uint32_t Swap(uint32_t value) const {
        return swapped_ ? Swap_(value) : value;
    }

    int16_t Swap(int16_t value) const {
        return Swap(static_cast<uint16_t>(value));
    }

    int32_t Swap(int32_t value) const {
        return Swap(static_cast<uint32_t>(value));
    }

    Framework(const char *framework_path) :
        swapped_(false)
    {
        base_ = map(framework_path, 0, _not(size_t), &size_, false);
        fat_header *fat_header = reinterpret_cast<struct fat_header *>(base_);

        if (Swap(fat_header->magic) == FAT_CIGAM) {
            swapped_ = !swapped_;
            goto fat;
        } else if (Swap(fat_header->magic) != FAT_MAGIC)
            mach_header_ = (mach_header *) base_;
        else fat: {
            size_t fat_narch = Swap(fat_header->nfat_arch);
            fat_arch *fat_arch = reinterpret_cast<struct fat_arch *>(fat_header + 1);
            size_t arch;
            for (arch = 0; arch != fat_narch; ++arch) {
                uint32_t arch_offset = Swap(fat_arch->offset);
                mach_header_ = (mach_header *) ((uint8_t *) base_ + arch_offset);
                goto found;
                ++fat_arch;
            }

            _assert(false);
        }

      found:
        if (Swap(mach_header_->magic) == MH_CIGAM)
            swapped_ = !swapped_;
        else _assert(Swap(mach_header_->magic) == MH_MAGIC);

        _assert(
            Swap(mach_header_->filetype) == MH_EXECUTE ||
            Swap(mach_header_->filetype) == MH_DYLIB ||
            Swap(mach_header_->filetype) == MH_BUNDLE
        );
    }

    void *GetBase() {
        return base_;
    }

    size_t GetSize() {
        return size_;
    }

    std::vector<struct load_command *> GetLoadCommands() {
        std::vector<struct load_command *> load_commands;

        struct load_command *load_command = reinterpret_cast<struct load_command *>(mach_header_ + 1);
        for (uint32_t cmd = 0; cmd != Swap(mach_header_->ncmds); ++cmd) {
            load_commands.push_back(load_command);
            load_command = (struct load_command *) ((uint8_t *) load_command + Swap(load_command->cmdsize));
        }

        return load_commands;
    }
};

#define CSMAGIC_CODEDIRECTORY 0xfade0c02
#define CSMAGIC_EMBEDDED_SIGNATURE 0xfade0cc0
#define CSSLOT_CODEDIRECTORY 0

struct BlobIndex {
    uint32_t type;
    uint32_t offset;
};

struct SuperBlob {
    uint32_t magic;
    uint32_t length;
    uint32_t count;
    struct BlobIndex index[];
};

struct CodeDirectory {
    uint32_t magic;
    uint32_t length;
    uint32_t version;
    uint32_t flags;
    uint32_t hashOffset;
    uint32_t identOffset;
    uint32_t nSpecialSlots;
    uint32_t nCodeSlots;
    uint32_t codeLimit;
    uint8_t hashSize;
    uint8_t hashType;
    uint8_t spare1;
    uint8_t pageSize;
    uint32_t spare2;
};

extern "C" uint32_t hash(uint8_t *k, uint32_t length, uint32_t initval);

#define CODESIGN_ALLOCATE "arm-apple-darwin9-codesign_allocate"

void sha1(uint8_t *hash, uint8_t *data, size_t size) {
    SHA1Context context;
    SHA1Reset(&context);
    SHA1Input(&context, data, size);
    SHA1Result(&context, hash);
}

int main(int argc, const char *argv[]) {
    bool flag_R(false);
    bool flag_t(false);
    bool flag_p(false);
    bool flag_u(false);

    bool flag_T(false);
    bool flag_S(false);

    bool timeh(false);
    uint32_t timev(0);

    std::vector<std::string> files;

    _assert(argc != 0);
    for (int argi(1); argi != argc; ++argi)
        if (argv[argi][0] != '-')
            files.push_back(argv[argi]);
        else switch (argv[argi][1]) {
            case 'R': flag_R = true; break;
            case 't': flag_t = true; break;
            case 'u': flag_u = true; break;
            case 'p': flag_p = true; break;
            case 'S': flag_S = true; break;

            case 'T': {
                flag_T = true;
                if (argv[argi][2] == '-')
                    timeh = true;
                else {
                    char *arge;
                    timev = strtoul(argv[argi] + 2, &arge, 0);
                    _assert(arge == argv[argi] + strlen(argv[argi]));
                }
            } break;

            default:
                goto usage;
            break;
        }

    if (files.empty()) usage: {
        exit(0);
    }

    size_t filei(0), filee(0);
    _foreach (file, files) try {
        const char *path(file->c_str());
        const char *base = strrchr(path, '/');
        char *temp(NULL), *dir;

        if (base != NULL)
            dir = strndup(path, base++ - path + 1);
        else {
            dir = strdup("");
            base = path;
        }

        if (flag_S) {
            asprintf(&temp, "%s.%s.cs", dir, base);
            const char *allocate = getenv("CODESIGN_ALLOCATE");
            if (allocate == NULL)
                allocate = "codesign_allocate";

            size_t size; {
                Framework framework(path);
                size = framework.GetSize();
            }

            pid_t pid = fork();
            _syscall(pid);
            if (pid == 0) {
                char *ssize;
                asprintf(&ssize, "%u", (sizeof(struct SuperBlob) + sizeof(struct BlobIndex) + sizeof(struct CodeDirectory) + strlen(base) + 1 + (size + 0x1000 - 1) / 0x1000 * 0x14 + 15) / 16 * 16);
                printf("%s\n", ssize);
                execlp(allocate, allocate, "-i", path, "-a", "arm", ssize, "-o", temp, NULL);
                _assert(false);
            }

            int status;
            _syscall(waitpid(pid, &status, 0));
            _assert(WIFEXITED(status));
            _assert(WEXITSTATUS(status) == 0);
        }

        Framework framework(temp == NULL ? path : temp);
        struct linkedit_data_command *signature(NULL);

        if (flag_p)
            printf("path%zu='%s'\n", filei, file->c_str());

        _foreach (load_command, framework.GetLoadCommands()) {
            uint32_t cmd(framework.Swap((*load_command)->cmd));

            if (flag_R && cmd == LC_REEXPORT_DYLIB)
                (*load_command)->cmd = framework.Swap(LC_LOAD_DYLIB);
            else if (cmd == LC_CODE_SIGNATURE)
                signature = reinterpret_cast<struct linkedit_data_command *>(*load_command);
            else if (cmd == LC_UUID) {
                volatile struct uuid_command *uuid_command(reinterpret_cast<struct uuid_command *>(*load_command));

                if (flag_u) {
                    printf("uuid%zu=%.2x%.2x%.2x%.2x-%.2x%.2x-%.2x%.2x-%.2x%.2x-%.2x%.2x%.2x%.2x%.2x%.2x\n", filei,
                        uuid_command->uuid[ 0], uuid_command->uuid[ 1], uuid_command->uuid[ 2], uuid_command->uuid[ 3],
                        uuid_command->uuid[ 4], uuid_command->uuid[ 5], uuid_command->uuid[ 6], uuid_command->uuid[ 7],
                        uuid_command->uuid[ 8], uuid_command->uuid[ 9], uuid_command->uuid[10], uuid_command->uuid[11],
                        uuid_command->uuid[12], uuid_command->uuid[13], uuid_command->uuid[14], uuid_command->uuid[15]
                    );
                }
            } else if (cmd == LC_ID_DYLIB) {
                volatile struct dylib_command *dylib_command(reinterpret_cast<struct dylib_command *>(*load_command));

                if (flag_t)
                    printf("time%zu=0x%.8x\n", filei, framework.Swap(dylib_command->dylib.timestamp));

                if (flag_T) {
                    uint32_t timed;

                    if (!timeh)
                        timed = timev;
                    else {
                        dylib_command->dylib.timestamp = 0;
                        timed = hash(reinterpret_cast<uint8_t *>(framework.GetBase()), framework.GetSize(), timev);
                    }

                    dylib_command->dylib.timestamp = framework.Swap(timed);
                }
            }
        }

        if (flag_S) {
            _assert(signature != NULL);

            uint32_t data = framework.Swap(signature->dataoff);
            uint32_t size = framework.Swap(signature->datasize);

            uint8_t *top = reinterpret_cast<uint8_t *>(framework.GetBase());
            uint8_t *blob = top + data;
            struct SuperBlob *super = reinterpret_cast<struct SuperBlob *>(blob);
            super->magic = Swap(CSMAGIC_EMBEDDED_SIGNATURE);

            uint32_t count = 1;
            uint32_t offset = sizeof(struct SuperBlob) + count * sizeof(struct BlobIndex);

            super->index[0].type = Swap(CSSLOT_CODEDIRECTORY);
            super->index[0].offset = Swap(offset);

            uint32_t begin = offset;
            struct CodeDirectory *directory = reinterpret_cast<struct CodeDirectory *>(blob + begin);
            offset += sizeof(struct CodeDirectory);

            directory->magic = Swap(CSMAGIC_CODEDIRECTORY);
            directory->version = Swap(0x00020001);
            directory->flags = Swap(0);
            directory->codeLimit = Swap(data);
            directory->hashSize = 0x14;
            directory->hashType = 0x01;
            directory->spare1 = 0x00;
            directory->pageSize = 0x0c;
            directory->spare2 = Swap(0);

            directory->identOffset = Swap(offset - begin);
            strcpy(reinterpret_cast<char *>(blob + offset), base);
            offset += strlen(base) + 1;

            uint8_t (*hashes)[20] = reinterpret_cast<uint8_t (*)[20]>(blob + offset);
            uint32_t special = 0;

            uint32_t pages = (data + 0x1000 - 1) / 0x1000;
            directory->nSpecialSlots = Swap(special);
            directory->nCodeSlots = Swap(pages);

            if (pages != 1)
                for (size_t i = 0; i != pages - 1; ++i)
                    sha1(hashes[special + i], top + 0x1000 * i, 0x1000);
            if (pages != 0)
                sha1(hashes[special + pages - 1], top + 0x1000 * (pages - 1), data % 0x1000);

            directory->hashOffset = Swap(offset - begin);
            offset += sizeof(*hashes) * (special + pages);
            directory->length = Swap(offset - begin);

            super->count = Swap(count);
            super->length = Swap(offset);

            _assert(offset < size);
            memset(blob + offset, 0, size - offset);
        }

        if (temp) {
            _syscall(unlink(path));
            _syscall(rename(temp, path));
            free(temp);
        }

        free(dir);
        ++filei;
    } catch (const char *) {
        ++filee;
        ++filei;
    }

    return filee;
}
Commit	Line	Data
a362a82f JF	1	/* JocStrap - Java/Objective-C Bootstrap
	2	* Copyright (C) 2007 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/mapping.h"
	40
fdb119ef JF	41	#include "sha1.h"
fdb119ef JF	42
a362a82f JF	43	#include <cstring>
	44	#include <string>
	45	#include <vector>
	46
fdb119ef JF	47	#include <sys/wait.h>
fdb119ef JF	48
a362a82f JF	49	struct fat_header {
	50	uint32_t magic;
	51	uint32_t nfat_arch;
	52	};
	53
	54	#define FAT_MAGIC 0xcafebabe
	55	#define FAT_CIGAM 0xbebafeca
	56
	57	struct fat_arch {
	58	uint32_t cputype;
	59	uint32_t cpusubtype;
	60	uint32_t offset;
	61	uint32_t size;
	62	uint32_t align;
	63	};
	64
	65	struct mach_header {
	66	uint32_t magic;
	67	uint32_t cputype;
	68	uint32_t cpusubtype;
	69	uint32_t filetype;
	70	uint32_t ncmds;
	71	uint32_t sizeofcmds;
	72	uint32_t flags;
	73	};
	74
fdb119ef	75	#define MH_MAGIC 0xfeedface
a362a82f JF	76	#define MH_CIGAM 0xcefaedfe
a362a82f JF	77
fdb119ef JF	78	#define MH_EXECUTE 0x2
	79	#define MH_DYLIB 0x6
	80	#define MH_BUNDLE 0x8
a362a82f JF	81
	82	struct load_command {
	83	uint32_t cmd;
	84	uint32_t cmdsize;
	85	};
	86
	87	#define LC_REQ_DYLD 0x80000000
	88
fdb119ef JF	89	#define LC_LOAD_DYLIB 0x0c
	90	#define LC_ID_DYLIB 0x0d
	91	#define LC_UUID 0x1b
	92	#define LC_CODE_SIGNATURE 0x1d
a362a82f JF	93	#define LC_REEXPORT_DYLIB (0x1f \| LC_REQ_DYLD)
	94
	95	struct dylib {
	96	uint32_t name;
	97	uint32_t timestamp;
	98	uint32_t current_version;
	99	uint32_t compatibility_version;
	100	};
	101
	102	struct dylib_command {
	103	uint32_t cmd;
	104	uint32_t cmdsize;
	105	struct dylib dylib;
	106	};
	107
	108	struct uuid_command {
	109	uint32_t cmd;
	110	uint32_t cmdsize;
	111	uint8_t uuid[16];
	112	};
	113
fdb119ef JF	114	struct linkedit_data_command {
	115	uint32_t cmd;
	116	uint32_t cmdsize;
	117	uint32_t dataoff;
	118	uint32_t datasize;
	119	};
	120
	121	uint16_t Swap_(uint16_t value) {
	122	return
	123	((value >> 8) & 0x00ff) \|
	124	((value << 8) & 0xff00);
	125	}
	126
	127	uint32_t Swap_(uint32_t value) {
	128	value = ((value >> 8) & 0x00ff00ff) \|
	129	((value << 8) & 0xff00ff00);
	130	value = ((value >> 16) & 0x0000ffff) \|
	131	((value << 16) & 0xffff0000);
	132	return value;
	133	}
	134
	135	int16_t Swap_(int16_t value) {
	136	return Swap_(static_cast<uint16_t>(value));
	137	}
	138
	139	int32_t Swap_(int32_t value) {
	140	return Swap_(static_cast<uint32_t>(value));
	141	}
	142
	143	uint16_t Swap(uint16_t value) {
	144	return true ? Swap_(value) : value;
	145	}
	146
	147	uint32_t Swap(uint32_t value) {
	148	return true ? Swap_(value) : value;
	149	}
	150
	151	int16_t Swap(int16_t value) {
	152	return Swap(static_cast<uint16_t>(value));
	153	}
	154
	155	int32_t Swap(int32_t value) {
	156	return Swap(static_cast<uint32_t>(value));
	157	}
	158
a362a82f JF	159	class Framework {
	160	private:
	161	void *base_;
	162	size_t size_;
	163	mach_header *mach_header_;
	164	bool swapped_;
	165
	166	public:
fdb119ef JF	167	uint16_t Swap(uint16_t value) const {
fdb119ef JF	168	return swapped_ ? Swap_(value) : value;
a362a82f JF	169	}
a362a82f JF	170
fdb119ef JF	171	uint32_t Swap(uint32_t value) const {
fdb119ef JF	172	return swapped_ ? Swap_(value) : value;
a362a82f JF	173	}
a362a82f JF	174
fdb119ef JF	175	int16_t Swap(int16_t value) const {
fdb119ef JF	176	return Swap(static_cast<uint16_t>(value));
a362a82f JF	177	}
a362a82f JF	178
fdb119ef JF	179	int32_t Swap(int32_t value) const {
fdb119ef JF	180	return Swap(static_cast<uint32_t>(value));
a362a82f JF	181	}
	182
	183	Framework(const char *framework_path) :
	184	swapped_(false)
	185	{
	186	base_ = map(framework_path, 0, _not(size_t), &size_, false);
	187	fat_header fat_header = reinterpret_cast<struct fat_header >(base_);
	188
	189	if (Swap(fat_header->magic) == FAT_CIGAM) {
	190	swapped_ = !swapped_;
	191	goto fat;
	192	} else if (Swap(fat_header->magic) != FAT_MAGIC)
	193	mach_header_ = (mach_header *) base_;
	194	else fat: {
	195	size_t fat_narch = Swap(fat_header->nfat_arch);
	196	fat_arch fat_arch = reinterpret_cast<struct fat_arch >(fat_header + 1);
	197	size_t arch;
	198	for (arch = 0; arch != fat_narch; ++arch) {
	199	uint32_t arch_offset = Swap(fat_arch->offset);
	200	mach_header_ = (mach_header ) ((uint8_t ) base_ + arch_offset);
	201	goto found;
	202	++fat_arch;
	203	}
	204
	205	_assert(false);
	206	}
	207
	208	found:
	209	if (Swap(mach_header_->magic) == MH_CIGAM)
	210	swapped_ = !swapped_;
	211	else _assert(Swap(mach_header_->magic) == MH_MAGIC);
	212
	213	_assert(
	214	Swap(mach_header_->filetype) == MH_EXECUTE \|\|
	215	Swap(mach_header_->filetype) == MH_DYLIB \|\|
	216	Swap(mach_header_->filetype) == MH_BUNDLE
	217	);
	218	}
	219
	220	void *GetBase() {
	221	return base_;
	222	}
	223
	224	size_t GetSize() {
	225	return size_;
	226	}
	227
	228	std::vector<struct load_command *> GetLoadCommands() {
	229	std::vector<struct load_command *> load_commands;
	230
	231	struct load_command load_command = reinterpret_cast<struct load_command >(mach_header_ + 1);
	232	for (uint32_t cmd = 0; cmd != Swap(mach_header_->ncmds); ++cmd) {
	233	load_commands.push_back(load_command);
	234	load_command = (struct load_command ) ((uint8_t ) load_command + Swap(load_command->cmdsize));
	235	}
	236
	237	return load_commands;
	238	}
	239	};
	240
fdb119ef JF	241	#define CSMAGIC_CODEDIRECTORY 0xfade0c02
	242	#define CSMAGIC_EMBEDDED_SIGNATURE 0xfade0cc0
	243	#define CSSLOT_CODEDIRECTORY 0
	244
	245	struct BlobIndex {
	246	uint32_t type;
	247	uint32_t offset;
	248	};
	249
	250	struct SuperBlob {
	251	uint32_t magic;
	252	uint32_t length;
	253	uint32_t count;
	254	struct BlobIndex index[];
	255	};
	256
	257	struct CodeDirectory {
	258	uint32_t magic;
	259	uint32_t length;
	260	uint32_t version;
	261	uint32_t flags;
	262	uint32_t hashOffset;
	263	uint32_t identOffset;
	264	uint32_t nSpecialSlots;
	265	uint32_t nCodeSlots;
	266	uint32_t codeLimit;
	267	uint8_t hashSize;
	268	uint8_t hashType;
	269	uint8_t spare1;
	270	uint8_t pageSize;
	271	uint32_t spare2;
	272	};
	273
a362a82f JF	274	extern "C" uint32_t hash(uint8_t *k, uint32_t length, uint32_t initval);
a362a82f JF	275
fdb119ef JF	276	#define CODESIGN_ALLOCATE "arm-apple-darwin9-codesign_allocate"
	277
	278	void sha1(uint8_t hash, uint8_t data, size_t size) {
	279	SHA1Context context;
	280	SHA1Reset(&context);
	281	SHA1Input(&context, data, size);
	282	SHA1Result(&context, hash);
	283	}
	284
a362a82f JF	285	int main(int argc, const char *argv[]) {
	286	bool flag_R(false);
	287	bool flag_t(false);
	288	bool flag_p(false);
	289	bool flag_u(false);
	290
	291	bool flag_T(false);
fdb119ef	292	bool flag_S(false);
a362a82f JF	293
	294	bool timeh(false);
	295	uint32_t timev(0);
	296
	297	std::vector<std::string> files;
	298
	299	_assert(argc != 0);
	300	for (int argi(1); argi != argc; ++argi)
	301	if (argv[argi][0] != '-')
	302	files.push_back(argv[argi]);
	303	else switch (argv[argi][1]) {
	304	case 'R': flag_R = true; break;
	305	case 't': flag_t = true; break;
	306	case 'u': flag_u = true; break;
	307	case 'p': flag_p = true; break;
fdb119ef	308	case 'S': flag_S = true; break;
a362a82f JF	309
	310	case 'T': {
	311	flag_T = true;
	312	if (argv[argi][2] == '-')
	313	timeh = true;
	314	else {
	315	char *arge;
	316	timev = strtoul(argv[argi] + 2, &arge, 0);
	317	_assert(arge == argv[argi] + strlen(argv[argi]));
	318	}
	319	} break;
	320
	321	default:
	322	goto usage;
	323	break;
	324	}
	325
	326	if (files.empty()) usage: {
	327	exit(0);
	328	}
	329
	330	size_t filei(0), filee(0);
	331	_foreach (file, files) try {
fdb119ef JF	332	const char *path(file->c_str());
	333	const char *base = strrchr(path, '/');
	334	char temp(NULL), dir;
	335
	336	if (base != NULL)
	337	dir = strndup(path, base++ - path + 1);
	338	else {
	339	dir = strdup("");
	340	base = path;
	341	}
	342
	343	if (flag_S) {
	344	asprintf(&temp, "%s.%s.cs", dir, base);
	345	const char *allocate = getenv("CODESIGN_ALLOCATE");
	346	if (allocate == NULL)
	347	allocate = "codesign_allocate";
	348
	349	size_t size; {
	350	Framework framework(path);
	351	size = framework.GetSize();
	352	}
	353
	354	pid_t pid = fork();
	355	_syscall(pid);
	356	if (pid == 0) {
	357	char *ssize;
	358	asprintf(&ssize, "%u", (sizeof(struct SuperBlob) + sizeof(struct BlobIndex) + sizeof(struct CodeDirectory) + strlen(base) + 1 + (size + 0x1000 - 1) / 0x1000 * 0x14 + 15) / 16 * 16);
	359	printf("%s\n", ssize);
	360	execlp(allocate, allocate, "-i", path, "-a", "arm", ssize, "-o", temp, NULL);
	361	_assert(false);
	362	}
	363
	364	int status;
	365	_syscall(waitpid(pid, &status, 0));
	366	_assert(WIFEXITED(status));
	367	_assert(WEXITSTATUS(status) == 0);
	368	}
	369
	370	Framework framework(temp == NULL ? path : temp);
	371	struct linkedit_data_command *signature(NULL);
a362a82f JF	372
	373	if (flag_p)
	374	printf("path%zu='%s'\n", filei, file->c_str());
	375
	376	_foreach (load_command, framework.GetLoadCommands()) {
	377	uint32_t cmd(framework.Swap((*load_command)->cmd));
	378
	379	if (flag_R && cmd == LC_REEXPORT_DYLIB)
	380	(*load_command)->cmd = framework.Swap(LC_LOAD_DYLIB);
fdb119ef JF	381	else if (cmd == LC_CODE_SIGNATURE)
fdb119ef JF	382	signature = reinterpret_cast<struct linkedit_data_command >(load_command);
a362a82f JF	383	else if (cmd == LC_UUID) {
	384	volatile struct uuid_command uuid_command(reinterpret_cast<struct uuid_command >(*load_command));
	385
	386	if (flag_u) {
	387	printf("uuid%zu=%.2x%.2x%.2x%.2x-%.2x%.2x-%.2x%.2x-%.2x%.2x-%.2x%.2x%.2x%.2x%.2x%.2x\n", filei,
	388	uuid_command->uuid[ 0], uuid_command->uuid[ 1], uuid_command->uuid[ 2], uuid_command->uuid[ 3],
	389	uuid_command->uuid[ 4], uuid_command->uuid[ 5], uuid_command->uuid[ 6], uuid_command->uuid[ 7],
	390	uuid_command->uuid[ 8], uuid_command->uuid[ 9], uuid_command->uuid[10], uuid_command->uuid[11],
	391	uuid_command->uuid[12], uuid_command->uuid[13], uuid_command->uuid[14], uuid_command->uuid[15]
	392	);
	393	}
	394	} else if (cmd == LC_ID_DYLIB) {
	395	volatile struct dylib_command dylib_command(reinterpret_cast<struct dylib_command >(*load_command));
	396
	397	if (flag_t)
	398	printf("time%zu=0x%.8x\n", filei, framework.Swap(dylib_command->dylib.timestamp));
	399
	400	if (flag_T) {
	401	uint32_t timed;
	402
	403	if (!timeh)
	404	timed = timev;
	405	else {
	406	dylib_command->dylib.timestamp = 0;
	407	timed = hash(reinterpret_cast<uint8_t *>(framework.GetBase()), framework.GetSize(), timev);
	408	}
	409
	410	dylib_command->dylib.timestamp = framework.Swap(timed);
	411	}
	412	}
	413	}
	414
fdb119ef JF	415	if (flag_S) {
	416	_assert(signature != NULL);
	417
	418	uint32_t data = framework.Swap(signature->dataoff);
	419	uint32_t size = framework.Swap(signature->datasize);
	420
	421	uint8_t top = reinterpret_cast<uint8_t >(framework.GetBase());
	422	uint8_t *blob = top + data;
	423	struct SuperBlob super = reinterpret_cast<struct SuperBlob >(blob);
	424	super->magic = Swap(CSMAGIC_EMBEDDED_SIGNATURE);
	425
	426	uint32_t count = 1;
	427	uint32_t offset = sizeof(struct SuperBlob) + count * sizeof(struct BlobIndex);
	428
	429	super->index[0].type = Swap(CSSLOT_CODEDIRECTORY);
	430	super->index[0].offset = Swap(offset);
	431
	432	uint32_t begin = offset;
	433	struct CodeDirectory directory = reinterpret_cast<struct CodeDirectory >(blob + begin);
	434	offset += sizeof(struct CodeDirectory);
	435
	436	directory->magic = Swap(CSMAGIC_CODEDIRECTORY);
	437	directory->version = Swap(0x00020001);
	438	directory->flags = Swap(0);
	439	directory->codeLimit = Swap(data);
	440	directory->hashSize = 0x14;
	441	directory->hashType = 0x01;
	442	directory->spare1 = 0x00;
	443	directory->pageSize = 0x0c;
	444	directory->spare2 = Swap(0);
	445
	446	directory->identOffset = Swap(offset - begin);
	447	strcpy(reinterpret_cast<char *>(blob + offset), base);
	448	offset += strlen(base) + 1;
	449
	450	uint8_t (hashes)[20] = reinterpret_cast<uint8_t ()[20]>(blob + offset);
	451	uint32_t special = 0;
	452
	453	uint32_t pages = (data + 0x1000 - 1) / 0x1000;
	454	directory->nSpecialSlots = Swap(special);
	455	directory->nCodeSlots = Swap(pages);
	456
	457	if (pages != 1)
	458	for (size_t i = 0; i != pages - 1; ++i)
	459	sha1(hashes[special + i], top + 0x1000 * i, 0x1000);
	460	if (pages != 0)
	461	sha1(hashes[special + pages - 1], top + 0x1000 * (pages - 1), data % 0x1000);
	462
	463	directory->hashOffset = Swap(offset - begin);
	464	offset += sizeof(hashes) (special + pages);
	465	directory->length = Swap(offset - begin);
	466
	467	super->count = Swap(count);
	468	super->length = Swap(offset);
	469
	470	_assert(offset < size);
	471	memset(blob + offset, 0, size - offset);
	472	}
	473
	474	if (temp) {
	475	_syscall(unlink(path));
	476	_syscall(rename(temp, path));
	477	free(temp);
	478	}
479
480	free(dir);
a362a82f JF	481	++filei;
	482	} catch (const char *) {
	483	++filee;
	484	++filei;
	485	}
	486
	487	return filee;
	488	}