-/*
- * Copyright (c) 2008,2010,2013-2014 Apple Inc. All Rights Reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
-
-#include <TargetConditionals.h>
-#if TARGET_OS_EMBEDDED
-
-#include "SecurityCommands.h"
-
-#include <AssertMacros.h>
-#include <mach-o/loader.h>
-#include <mach-o/fat.h>
-#include <CoreFoundation/CoreFoundation.h>
-#include <Security/SecCMS.h>
-#include <Security/SecPolicyPriv.h>
-#include <CommonCrypto/CommonDigest.h>
-#include <CommonCrypto/CommonDigestSPI.h>
-#include <utilities/SecCFRelease.h>
-
-/*
- * Magic numbers used by Code Signing
- */
-enum {
- CSMAGIC_REQUIREMENT = 0xfade0c00, /* single Requirement blob */
- CSMAGIC_REQUIREMENTS = 0xfade0c01, /* Requirements vector (internal requirements) */
- CSMAGIC_CODEDIRECTORY = 0xfade0c02, /* CodeDirectory blob */
- CSMAGIC_EMBEDDED_SIGNATURE = 0xfade0cc0, /* embedded form of signature data */
- CSMAGIC_DETACHED_SIGNATURE = 0xfade0cc1, /* multi-arch collection of embedded signatures */
-
- CSSLOT_CODEDIRECTORY = 0, /* slot index for CodeDirectory */
-};
-
-
-/*
- * Structure of an embedded-signature SuperBlob
- */
-typedef struct __BlobIndex {
- uint32_t type; /* type of entry */
- uint32_t offset; /* offset of entry */
-} CS_BlobIndex;
-
-typedef struct __SuperBlob {
- uint32_t magic; /* magic number */
- uint32_t length; /* total length of SuperBlob */
- uint32_t count; /* number of index entries following */
- CS_BlobIndex index[]; /* (count) entries */
- /* followed by Blobs in no particular order as indicated by offsets in index */
-} CS_SuperBlob;
-
-
-/*
- * C form of a CodeDirectory.
- */
-typedef struct __CodeDirectory {
- uint32_t magic; /* magic number (CSMAGIC_CODEDIRECTORY) */
- uint32_t length; /* total length of CodeDirectory blob */
- uint32_t version; /* compatibility version */
- uint32_t flags; /* setup and mode flags */
- uint32_t hashOffset; /* offset of hash slot element at index zero */
- uint32_t identOffset; /* offset of identifier string */
- uint32_t nSpecialSlots; /* number of special hash slots */
- uint32_t nCodeSlots; /* number of ordinary (code) hash slots */
- uint32_t codeLimit; /* limit to main image signature range */
- uint8_t hashSize; /* size of each hash in bytes */
- uint8_t hashType; /* type of hash (cdHashType* constants) */
- uint8_t spare1; /* unused (must be zero) */
- uint8_t pageSize; /* log2(page size in bytes); 0 => infinite */
- uint32_t spare2; /* unused (must be zero) */
- /* followed by dynamic content as located by offset fields above */
-} CS_CodeDirectory;
-
-
- //assert(page < ntohl(cd->nCodeSlots));
- //return base + ntohl(cd->hashOffset) + page * 20;
-
-#if 0
-static void debug_data(uint8_t *data, size_t length)
-{
- uint32_t i, j;
- for (i = 0; i < length; i+=16) {
- fprintf(stderr, "%p ", (void*)(data+i));
- for (j = 0; (j < 16) && (j+i < length); j++) {
- uint8_t byte = *(uint8_t*)(data+i+j);
- fprintf(stderr, "%.02x %c|", byte, isprint(byte) ? byte : '?');
- }
- fprintf(stderr, "\n");
- }
-}
-
-static void write_data(const char *path, uint8_t *data, size_t length)
-{
- int fd = open(path, O_RDWR|O_TRUNC|O_CREAT, 0644);
- require(fd>0, out);
- write(fd, data, length);
- close(fd);
-out:
- return;
-}
-#endif
-
-static void fprint_digest(FILE *file, unsigned char *digest, size_t length) {
- size_t ix;
- for (ix = 0; ix < length; ++ix) {
- fprintf(file, "%02x", digest[ix]);
- }
-}
-
-static CFMutableDictionaryRef lc_code_sig(uint8_t *lc_code_signature, size_t lc_code_signature_len)
-{
- CFMutableDictionaryRef code_signature =
- CFDictionaryCreateMutable(kCFAllocatorDefault, 0,
- &kCFTypeDictionaryKeyCallBacks,
- &kCFTypeDictionaryValueCallBacks);
- require(code_signature, out);
-
- CS_SuperBlob *sb = (CS_SuperBlob*)lc_code_signature;
- require(ntohl(sb->magic) == CSMAGIC_EMBEDDED_SIGNATURE, out);
- uint32_t count;
- for (count = 0; count < ntohl(sb->count); count++) {
- //uint32_t type = ntohl(sb->index[count].type);
- uint32_t offset = ntohl(sb->index[count].offset);
- uint8_t *bytes = lc_code_signature + offset;
- //fprintf(stderr, "blob[%d]: (type: 0x%.08x, offset: %p)\n", count, type, (void*)offset);
- uint32_t magic = ntohl(*(uint32_t*)bytes);
- uint32_t length = ntohl(*(uint32_t*)(bytes+4));
- //fprintf(stderr, " magic: 0x%.08x length: %d\n", magic, length);
- switch(magic) {
- case 0xfade0c01: //write_data("requirements", bytes, length);
- break;
- case 0xfade0c02: //write_data("codedir", bytes, length);
- {
- const CS_CodeDirectory *cd = (const CS_CodeDirectory *)bytes;
- CFDataRef codedir = CFDataCreate(kCFAllocatorDefault, bytes, length);
- require(codedir, out);
- CFDictionarySetValue(code_signature, CFSTR("CodeDirectory"), codedir);
- CFRelease(codedir);
- require_string(ntohl(cd->version) >= 0x20001, out, "incompatible version");
- require_string(ntohl(cd->version) <= 0x2F000, out, "incompatible version");
- require_string(cd->hashSize == 20, out, "unexpected hash size");
- require_string(cd->hashType == 1, out, "unexpected hash type");
-
- uint32_t hash_offset = ntohl(cd->hashOffset);
- uint32_t entitlement_slot = 5;
-
- if (ntohl(cd->nSpecialSlots) >= entitlement_slot) {
- CFDataRef message = CFDataCreate(kCFAllocatorDefault, bytes+hash_offset-entitlement_slot*cd->hashSize, cd->hashSize);
- require(message, out);
- CFDictionarySetValue(code_signature, CFSTR("EntitlementsCDHash"), message);
- CFRelease(message);
- } else
- fprintf(stderr, "no entitlements slot yet\n");
- }
- break;
- case 0xfade0b01: //write_data("signed", lc_code_signature, bytes-lc_code_signature);
- if (length != 8) {
- CFDataRef message = CFDataCreate(kCFAllocatorDefault, bytes+8, length-8);
- require(message, out);
- CFDictionarySetValue(code_signature, CFSTR("SignedData"), message);
- CFRelease(message);
- }
- break;
- case 0xfade7171:
- {
- unsigned char digest[CC_SHA1_DIGEST_LENGTH];
- CCDigest(kCCDigestSHA1, bytes, length, digest);
-
- CFDataRef message = CFDataCreate(kCFAllocatorDefault, digest, sizeof(digest));
- require(message, out);
- CFDictionarySetValue(code_signature, CFSTR("EntitlementsHash"), message);
- CFRelease(message);
- message = CFDataCreate(kCFAllocatorDefault, bytes+8, length-8);
- require(message, out);
- CFDictionarySetValue(code_signature, CFSTR("Entitlements"), message);
- CFRelease(message);
- break;
- }
- default:
- fprintf(stderr, "Skipping block with magic: 0x%x\n", magic);
- break;
- }
- }
- return code_signature;
-out:
- if (code_signature) CFRelease(code_signature);
- return NULL;
-}
-
-static FILE *
-open_bundle(const char * path, const char * mode)
-{
- char full_path[1024] = {};
- CFStringRef path_cfstring = NULL;
- CFURLRef path_url = NULL;
- CFBundleRef bundle = NULL;
- CFURLRef exec = NULL;
-
- path_cfstring = CFStringCreateWithFileSystemRepresentation(kCFAllocatorDefault, path);
- require_quiet(path_cfstring, out);
- path_url = CFURLCreateWithFileSystemPath(kCFAllocatorDefault, path_cfstring, kCFURLPOSIXPathStyle, true);
- require_quiet(path_url, out);
- bundle = CFBundleCreate(kCFAllocatorDefault, path_url);
- require_quiet(bundle, out);
- exec = CFBundleCopyExecutableURL(bundle);
- require(exec, out);
- require(CFURLGetFileSystemRepresentation(exec, true, (uint8_t*)full_path, sizeof(full_path)), out);
-out:
- CFReleaseSafe(path_cfstring);
- CFReleaseSafe(path_url);
- CFReleaseSafe(bundle);
- CFReleaseSafe(exec);
-
- return fopen(full_path, "r");
-}
-
-static CFMutableDictionaryRef load_code_signature(FILE *binary, size_t slice_offset)
-{
- bool signature_found = false;
- CFMutableDictionaryRef result = NULL;
- struct load_command lc;
- do {
- require(1 == fread(&lc, sizeof(lc), 1, binary), out);
- if (lc.cmd == LC_CODE_SIGNATURE) {
- struct { uint32_t offset; uint32_t size; } sig;
- require(1 == fread(&sig, sizeof(sig), 1, binary), out);
- require_noerr(fseek(binary, slice_offset+sig.offset, SEEK_SET), out);
- size_t length = sig.size;
- uint8_t *data = malloc(length);
- require(length && data, out);
- require(1 == fread(data, length, 1, binary), out);
- signature_found = true;
- result = lc_code_sig(data, length);
- free(data);
- break;
- }
- require_noerr(fseek(binary, lc.cmdsize-sizeof(lc), SEEK_CUR), out);
- } while(lc.cmd || lc.cmdsize); /* count lc */
-out:
- if (!signature_found)
- fprintf(stderr, "No LC_CODE_SIGNATURE segment found\n");
- return result;
-}
-
-static CF_RETURNS_RETAINED CFArrayRef load_code_signatures(const char *path)
-{
- bool fully_parsed_binary = false;
- CFMutableDictionaryRef result = NULL;
- CFMutableArrayRef results = CFArrayCreateMutable(kCFAllocatorDefault, 0, &kCFTypeArrayCallBacks);
-
- FILE *binary = open_bundle(path, "r");
- if (!binary) binary = fopen(path, "r");
- require(binary, out);
-
- struct mach_header header;
- require(1 == fread(&header, sizeof(header), 1, binary), out);
- if ((header.magic == MH_MAGIC) || (header.magic == MH_MAGIC_64)) {
- if (header.magic == MH_MAGIC_64)
- fseek(binary, sizeof(struct mach_header_64) - sizeof(struct mach_header), SEEK_CUR);
- result = load_code_signature(binary, 0 /*non fat*/);
- require(result, out);
- CFStringRef type = CFStringCreateWithFormat(kCFAllocatorDefault, NULL, CFSTR("CPU type: (%d,%d)"), header.cputype, header.cpusubtype);
- CFDictionarySetValue(result, CFSTR("ARCH"), type);
- CFRelease(type);
- CFArrayAppendValue(results, result);
- }
- else
- {
- struct fat_header fat;
- require(!fseek(binary, 0L, SEEK_SET), out);
- require(1 == fread(&fat, sizeof(fat), 1, binary), out);
- require(ntohl(fat.magic) == FAT_MAGIC, out);
- uint32_t slice, slices = ntohl(fat.nfat_arch);
- struct fat_arch *archs = calloc(slices, sizeof(struct fat_arch));
- require(slices == fread(archs, sizeof(struct fat_arch), slices, binary), out);
- for (slice = 0; slice < slices; slice++) {
- uint32_t slice_offset = ntohl(archs[slice].offset);
- require(!fseek(binary, slice_offset, SEEK_SET), out);
- require(1 == fread(&header, sizeof(header), 1, binary), out);
- require((header.magic == MH_MAGIC) || (header.magic == MH_MAGIC_64), out);
- if (header.magic == MH_MAGIC_64)
- fseek(binary, sizeof(struct mach_header_64) - sizeof(struct mach_header), SEEK_CUR);
- result = load_code_signature(binary, slice_offset);
- require(result, out);
- CFStringRef type = CFStringCreateWithFormat(kCFAllocatorDefault, NULL, CFSTR("CPU type: (%d,%d)"), header.cputype, header.cpusubtype);
- CFDictionarySetValue(result, CFSTR("ARCH"), type);
- CFRelease(type);
- CFArrayAppendValue(results, result);
- CFRelease(result);
- }
- }
- fully_parsed_binary = true;
-out:
- if (!fully_parsed_binary) {
- if (results) {
- CFRelease(results);
- results = NULL;
- }
- }
- if (binary)
- fclose(binary);
- return results;
-}
-
-
-extern int codesign_util(int argc, char * const *argv)
-{
- int result = 1, verbose = 0;
- char ch;
-
- while ((ch = getopt(argc, argv, "v")) != -1)
- {
- switch (ch)
- {
- case 'v':
- verbose++;
- break;
- default:
- return SHOW_USAGE_MESSAGE;
- }
- }
-
- argc -= optind;
- argv += optind;
-
- if (argc != 1)
- return SHOW_USAGE_MESSAGE;
-
- CFArrayRef sigs = load_code_signatures(argv[0]);
- require(sigs, out);
-
- if (verbose >= 2)
- CFShow(sigs);
-
- CFIndex i, count = CFArrayGetCount(sigs);
-
- for (i = 0; i < count; i++) {
- CFDictionaryRef signature = CFArrayGetValueAtIndex(sigs, i);
-
- CFDataRef code_dir = CFDictionaryGetValue(signature, CFSTR("CodeDirectory"));
- const CS_CodeDirectory *cd = (CS_CodeDirectory *)CFDataGetBytePtr(code_dir);
-
- CFDataRef signed_data = CFDictionaryGetValue(signature, CFSTR("SignedData"));
-
- CFDataRef entitlements = CFDictionaryGetValue(signature, CFSTR("Entitlements"));
- CFDataRef entitlements_cd_hash = CFDictionaryGetValue(signature, CFSTR("EntitlementsCDHash"));
- CFDataRef entitlements_hash = CFDictionaryGetValue(signature, CFSTR("EntitlementsHash"));
-
- CFStringRef arch = CFDictionaryGetValue(signature, CFSTR("ARCH"));
-
- CFShow(arch);
-
- SecPolicyRef policy = SecPolicyCreateiPhoneApplicationSigning();
-
- if (signed_data) {
- if (SecCMSVerify(signed_data, code_dir, policy, NULL, NULL)) {
- fprintf(stderr, "Failed to verify signature\n");
- result = -1;
- } else
- fprintf(stderr, "Signature ok\n");
-
- } else
- fprintf(stderr, "Ad-hoc signed binary\n");
-
- if (entitlements_cd_hash) {
- if (entitlements_hash && entitlements_cd_hash && CFEqual(entitlements_hash, entitlements_cd_hash))
- fprintf(stderr, "Entitlements ok\n");
- else
- fprintf(stderr, "Entitlements modified\n");
- }
-
- if (verbose >= 2) {
- fprintf(stderr, "magic: 0x%x length: %u(%lu)\n", ntohl(cd->magic), ntohl(cd->length), CFDataGetLength(code_dir));
- fprintf(stderr, "code directory version/flags: 0x%x/0x%x special/code hash slots: %u/%u\n"
- "codelimit: %u hash size/type: %u/%u hash/ident offset: %u/%u\n",
- ntohl(cd->version), ntohl(cd->flags), ntohl(cd->nSpecialSlots), ntohl(cd->nCodeSlots),
- ntohl(cd->codeLimit), cd->hashSize, cd->hashType, ntohl(cd->hashOffset), ntohl(cd->identOffset));
- fprintf(stderr, "ident: '%s'\n", CFDataGetBytePtr(code_dir) + ntohl(cd->identOffset));
-
- uint32_t ix;
- uint8_t *hashes = (uint8_t *)CFDataGetBytePtr(code_dir) + ntohl(cd->hashOffset);
- for (ix = 0; ix < ntohl(cd->nSpecialSlots); ++ix) {
- fprint_digest(stderr, hashes, cd->hashSize);
- fprintf(stderr, "\n");
- hashes += cd->hashSize;
- }
- }
-
- if (verbose >= 1) {
- if (entitlements)
- fprintf(stderr, "Entitlements\n%.*s", (int)CFDataGetLength(entitlements)-8, CFDataGetBytePtr(entitlements)+8);
- }
-
- if (verbose >= 2) {
- if (entitlements_hash) {
- fprintf(stderr, "digest: ");
- fprint_digest(stderr, (uint8_t *)CFDataGetBytePtr(entitlements_hash), CC_SHA1_DIGEST_LENGTH);
- fprintf(stderr, "\n");
- }
- }
- CFReleaseNull(policy);
- }
-
- CFReleaseSafe(sigs);
-
- return result;
-out:
- return -1;
-}
-
-#endif // TARGET_OS_EMBEDDED
projects / apple / security.git / blobdiff