Filza 27.2 worse_query: public and developer builds
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#include "CSBlob.h"
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#include "CodeDirectory.h"
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#include "MachO.h"
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#include "MachOByteOrder.h"
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#include "BufferedStream.h"
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#include "MemoryStream.h"
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#include "Util.h"
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#include <mach-o/loader.h>
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#include <stddef.h>
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#include <stdint.h>
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const char *cs_blob_magic_to_string(uint32_t magic)
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{
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switch (magic) {
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case CSMAGIC_REQUIREMENT:
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return "Requirement blob";
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case CSMAGIC_REQUIREMENTS:
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return "Requirements blob";
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case CSMAGIC_CODEDIRECTORY:
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return "Code directory blob";
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case CSMAGIC_EMBEDDED_SIGNATURE:
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return "Embedded signature blob";
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case CSMAGIC_EMBEDDED_SIGNATURE_OLD:
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return "Embedded signature blob (old)";
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case CSMAGIC_EMBEDDED_ENTITLEMENTS:
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return "Entitlements blob";
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case CSMAGIC_EMBEDDED_DER_ENTITLEMENTS:
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return "DER entitlements blob";
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case CSMAGIC_DETACHED_SIGNATURE:
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return "Detached signature blob";
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case CSMAGIC_BLOBWRAPPER:
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return "Signature blob";
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case CSMAGIC_EMBEDDED_LAUNCH_CONSTRAINT:
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return "Launchd contraint blob";
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default:
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return "Unknown blob type";
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}
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}
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const char *cs_slot_type_to_string(uint32_t slotType)
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{
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if (slotType & CSSLOT_ALTERNATE_CODEDIRECTORIES) {
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int num = slotType & 0xfff;
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switch (num) {
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case 0:
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return "Alternate code directory slot (1)";
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case 1:
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return "Alternate code directory slot (2)";
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case 2:
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return "Alternate code directory slot (3)";
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case 3:
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return "Alternate code directory slot (4)";
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case 4:
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return "Alternate code directory slot (5)";
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default:
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return "Alternate code directory slot (invalid)";
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}
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}
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switch (slotType) {
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case CSSLOT_CODEDIRECTORY:
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return "Code directory slot";
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case CSSLOT_INFOSLOT:
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return "Info slot";
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case CSSLOT_REQUIREMENTS:
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return "Requirements slot";
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case CSSLOT_RESOURCEDIR:
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return "Resource Dir slot";
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case CSSLOT_APPLICATION:
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return "Application slot";
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case CSSLOT_ENTITLEMENTS:
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return "Entitlements slot";
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case CSSLOT_DER_ENTITLEMENTS:
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return "DER entitlements slot";
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case CSSLOT_LAUNCH_CONSTRAINT_SELF:
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return "Launch constraint slot (self)";
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case CSSLOT_LAUNCH_CONSTRAINT_PARENT:
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return "Launch constraint slot (parent)";
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case CSSLOT_LAUNCH_CONSTRAINT_RESPONSIBLE:
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return "Launch constraint slot (responsible)";
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case CSSLOT_LIBRARY_CONSTRAINT:
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return "Library constraint slot";
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case CSSLOT_SIGNATURESLOT:
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return "Signature slot";
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case CSSLOT_IDENTIFICATIONSLOT:
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return "Identification slot";
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case CSSLOT_TICKETSLOT:
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return "Ticket slot";
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default:
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return "Unknown blob type";
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}
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}
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int macho_parse_signature_blob_to_der_encoded_data(MachO *macho, uint32_t signatureBlobOffset, uint32_t signatureBlobLength, void *outputDER)
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{
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return macho_read_at_offset(macho, signatureBlobOffset + 8, signatureBlobLength - 8, outputDER);
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}
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int macho_find_code_signature_bounds(MachO *macho, uint32_t *offsetOut, uint32_t *sizeOut)
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{
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__block int r = -1;
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macho_enumerate_load_commands(macho, ^(struct load_command loadCommand, uint64_t offset, void *cmd, bool *stop) {
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if (loadCommand.cmd == LC_CODE_SIGNATURE) {
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struct linkedit_data_command *csLoadCommand = ((struct linkedit_data_command *)cmd);
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LINKEDIT_DATA_COMMAND_APPLY_BYTE_ORDER(csLoadCommand, LITTLE_TO_HOST_APPLIER);
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if (offsetOut) *offsetOut = csLoadCommand->dataoff;
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if (sizeOut) *sizeOut = csLoadCommand->datasize;
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*stop = true;
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r = 0;
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}
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});
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return r;
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}
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CS_SuperBlob *macho_read_code_signature(MachO *macho)
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{
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uint32_t offset = 0, size = 0;
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if (macho_find_code_signature_bounds(macho, &offset, &size) == 0) {
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CS_SuperBlob *dataOut = malloc(size);
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if (macho_read_at_offset(macho, offset, size, dataOut) == 0) {
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return dataOut;
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}
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else {
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free(dataOut);
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}
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}
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return NULL;
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}
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int macho_replace_code_signature(MachO *macho, CS_SuperBlob *superblob)
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{
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uint32_t csSegmentOffset = 0, csSegmentSize = 0;
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macho_find_code_signature_bounds(macho, &csSegmentOffset, &csSegmentSize);
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uint32_t sizeOfCodeSignature = 0;
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memory_stream_read(macho->stream, csSegmentOffset + offsetof(CS_SuperBlob, length), sizeof(sizeOfCodeSignature), &sizeOfCodeSignature);
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sizeOfCodeSignature = BIG_TO_HOST(sizeOfCodeSignature);
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uint64_t newCodeSignatureSize = BIG_TO_HOST(superblob->length);
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// See how much space we have to write the new code signature
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uint64_t entireFileSize = memory_stream_get_size(macho->stream);
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uint64_t freeSpace = entireFileSize - csSegmentOffset;
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uint64_t paddingSize = freeSpace - sizeOfCodeSignature;
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if (newCodeSignatureSize >= freeSpace) {
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macho_write_at_offset(macho, csSegmentOffset, newCodeSignatureSize, superblob);
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uint8_t padding[paddingSize];
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memset(padding, 0, paddingSize);
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macho_write_at_offset(macho, csSegmentOffset + newCodeSignatureSize, paddingSize, padding);
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} else if (newCodeSignatureSize < freeSpace) {
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memory_stream_trim(macho_get_stream(macho), 0, entireFileSize - csSegmentOffset);
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macho_write_at_offset(macho, csSegmentOffset, newCodeSignatureSize, superblob);
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uint8_t padding[paddingSize];
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memset(padding, 0, paddingSize);
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macho_write_at_offset(macho, csSegmentOffset + newCodeSignatureSize, paddingSize, padding);
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}
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return 0;
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}
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int macho_extract_cs_to_file(MachO *macho, CS_SuperBlob *superblob)
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{
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FILE *csDataFile = fopen("Code_Signature-Data", "wb+");
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fwrite(superblob, BIG_TO_HOST(superblob->length), 1, csDataFile);
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fclose(csDataFile);
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return 0;
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}
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CS_DecodedBlob *csd_blob_init(uint32_t type, CS_GenericBlob *blobData)
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{
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CS_DecodedBlob *blob = malloc(sizeof(CS_DecodedBlob));
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if (!blob) return NULL;
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memset(blob, 0, sizeof(CS_DecodedBlob));
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blob->type = type;
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blob->stream = buffered_stream_init_from_buffer(blobData, BIG_TO_HOST(blobData->length), BUFFERED_STREAM_FLAG_AUTO_EXPAND);
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return blob;
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}
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int csd_blob_read(CS_DecodedBlob *blob, uint64_t offset, size_t size, void *outBuf)
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{
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return memory_stream_read(blob->stream, offset, size, outBuf);
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}
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static void _csd_blob_fix_length(CS_DecodedBlob *blob)
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{
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uint32_t curSize = HOST_TO_BIG((uint32_t)memory_stream_get_size(blob->stream));
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memory_stream_write(blob->stream, offsetof(CS_GenericBlob, length), sizeof(curSize), &curSize);
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}
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int csd_blob_write(CS_DecodedBlob *blob, uint64_t offset, size_t size, const void *inBuf)
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{
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int r = memory_stream_write(blob->stream, offset, size, inBuf);
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if (r == 0) _csd_blob_fix_length(blob);
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return r;
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}
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int csd_blob_insert(CS_DecodedBlob *blob, uint64_t offset, size_t size, const void *inBuf)
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{
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int r = memory_stream_insert(blob->stream, offset, size, inBuf);
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if (r == 0) _csd_blob_fix_length(blob);
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return r;
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}
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int csd_blob_delete(CS_DecodedBlob *blob, uint64_t offset, size_t size)
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{
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int r = memory_stream_delete(blob->stream, offset, size);
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if (r == 0) _csd_blob_fix_length(blob);
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return r;
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}
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int csd_blob_read_string(CS_DecodedBlob *blob, uint64_t offset, char **outString)
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{
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return memory_stream_read_string(blob->stream, offset, outString);
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}
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int csd_blob_write_string(CS_DecodedBlob *blob, uint64_t offset, const char *string)
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{
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int r = memory_stream_write_string(blob->stream, offset, string);
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if (r == 0) _csd_blob_fix_length(blob);
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return r;
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}
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size_t csd_blob_get_size(CS_DecodedBlob *blob)
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{
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return memory_stream_get_size(blob->stream);
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}
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uint32_t csd_blob_get_type(CS_DecodedBlob *blob)
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{
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return blob->type;
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}
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void csd_blob_set_type(CS_DecodedBlob *blob, uint32_t type)
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{
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blob->type = type;
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}
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void csd_blob_free(CS_DecodedBlob *blob)
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{
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if (blob->stream) {
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memory_stream_free(blob->stream);
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}
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free(blob);
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}
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CS_DecodedSuperBlob *csd_superblob_init(void)
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{
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CS_DecodedSuperBlob *decodedSuperblob = malloc(sizeof(CS_DecodedSuperBlob));
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if (!decodedSuperblob) return NULL;
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memset(decodedSuperblob, 0, sizeof(CS_DecodedSuperBlob));
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return decodedSuperblob;
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}
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CS_DecodedSuperBlob *csd_superblob_decode(CS_SuperBlob *superblob)
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{
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uint32_t magic = BIG_TO_HOST(superblob->magic);
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if (magic != CSMAGIC_EMBEDDED_SIGNATURE && magic != CSMAGIC_DETACHED_SIGNATURE) return NULL;
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CS_DecodedSuperBlob *decodedSuperblob = csd_superblob_init();
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if (!decodedSuperblob) return NULL;
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CS_DecodedBlob **nextBlob = &decodedSuperblob->firstBlob;
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decodedSuperblob->magic = magic;
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for (uint32_t i = 0; i < BIG_TO_HOST(superblob->count); i++) {
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CS_BlobIndex curIndex = superblob->index[i];
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BLOB_INDEX_APPLY_BYTE_ORDER(&curIndex, BIG_TO_HOST_APPLIER);
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//printf("decoding %u (type: %x, offset: 0x%x)\n", i, curIndex.type, curIndex.offset);
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CS_GenericBlob *curBlobData = (CS_GenericBlob *)(((uint8_t*)superblob) + curIndex.offset);
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*nextBlob = csd_blob_init(curIndex.type, curBlobData);
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nextBlob = &(*nextBlob)->next;
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}
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return decodedSuperblob;
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}
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CS_SuperBlob *csd_superblob_encode(CS_DecodedSuperBlob *decodedSuperblob)
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{
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uint32_t blobCount = 0, blobSize = 0;
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// Determine amount and size of contained blobs
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CS_DecodedBlob *nextBlob = decodedSuperblob->firstBlob;
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while (nextBlob) {
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blobCount++;
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blobSize += csd_blob_get_size(nextBlob);
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nextBlob = nextBlob->next;
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}
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uint32_t superblobLength = sizeof(CS_SuperBlob) + (sizeof(CS_BlobIndex) * blobCount) + blobSize;
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CS_SuperBlob *superblob = malloc(superblobLength);
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// Populate superblob fields
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superblob->count = blobCount;
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superblob->length = superblobLength;
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superblob->magic = decodedSuperblob->magic;
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SUPERBLOB_APPLY_BYTE_ORDER(superblob, HOST_TO_BIG_APPLIER)
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// Populate indexes and write actual backing data
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uint32_t idx = 0;
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uint32_t dataStartOffset = sizeof(CS_SuperBlob) + (sizeof(CS_BlobIndex) * blobCount);
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uint8_t *superblobData = ((uint8_t*)superblob) + dataStartOffset;
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uint8_t *superblobDataCur = superblobData;
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nextBlob = decodedSuperblob->firstBlob;
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while (nextBlob) {
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// Populate blob data
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uint32_t curSize = csd_blob_get_size(nextBlob);
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csd_blob_read(nextBlob, 0, curSize, superblobDataCur);
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// Populate index
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CS_BlobIndex *curIndex = &superblob->index[idx];
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curIndex->offset = dataStartOffset + (superblobDataCur - superblobData);
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curIndex->type = nextBlob->type;
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BLOB_INDEX_APPLY_BYTE_ORDER(curIndex, HOST_TO_BIG_APPLIER);
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superblobDataCur += curSize;
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idx++;
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nextBlob = nextBlob->next;
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}
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return superblob;
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}
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CS_DecodedBlob *csd_superblob_find_blob(CS_DecodedSuperBlob *superblob, uint32_t type, uint32_t *indexOut)
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{
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CS_DecodedBlob *blob = superblob->firstBlob;
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uint32_t i = 0;
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while (blob) {
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if (blob->type == type) {
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if (indexOut) *indexOut = i;
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return blob;
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}
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blob = blob->next;
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i++;
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}
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return NULL;
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}
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CS_DecodedBlob *csd_superblob_find_blob_by_magic(CS_DecodedSuperBlob *superblob, uint32_t magic, uint32_t *indexOut)
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{
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CS_DecodedBlob *blob = superblob->firstBlob;
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uint32_t i = 0;
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while (blob) {
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uint32_t blobMagic = 0;
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memory_stream_read(blob->stream, 0, sizeof(uint32_t), &blobMagic);
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if (BIG_TO_HOST(blobMagic) == magic) {
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if (indexOut) *indexOut = i;
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return blob;
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}
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blob = blob->next;
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i++;
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}
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return NULL;
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}
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int csd_superblob_insert_blob_after_blob(CS_DecodedSuperBlob *superblob, CS_DecodedBlob *blobToInsert, CS_DecodedBlob *afterBlob)
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{
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blobToInsert->next = afterBlob->next;
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afterBlob->next = blobToInsert;
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return 0;
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}
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int csd_superblob_insert_blob_at_index(CS_DecodedSuperBlob *superblob, CS_DecodedBlob *blobToInsert, uint32_t atIndex)
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{
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if (atIndex == 0) {
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blobToInsert->next = superblob->firstBlob;
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superblob->firstBlob = blobToInsert;
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return 0;
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}
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else {
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uint32_t i = 0;
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CS_DecodedBlob *blobAtIndex = superblob->firstBlob;
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while (blobAtIndex && i < atIndex) {
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blobAtIndex = blobAtIndex->next;
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i++;
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}
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if (blobAtIndex) {
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return csd_superblob_insert_blob_after_blob(superblob, blobToInsert, blobAtIndex);
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}
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return -1;
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}
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}
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int csd_superblob_append_blob(CS_DecodedSuperBlob *superblob, CS_DecodedBlob *blobToAppend)
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{
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if (!superblob->firstBlob) {
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superblob->firstBlob = blobToAppend;
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return 0;
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}
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CS_DecodedBlob *lastBlob = superblob->firstBlob;
|
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while (lastBlob->next) {
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lastBlob = lastBlob->next;
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}
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return csd_superblob_insert_blob_after_blob(superblob, blobToAppend, lastBlob);
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}
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int csd_superblob_replace_blob(CS_DecodedSuperBlob *superblob, CS_DecodedBlob *newBlob)
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{
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uint32_t index = 0;
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CS_DecodedBlob *blob = csd_superblob_find_blob(superblob, newBlob->type, &index);
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if (blob) {
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csd_superblob_remove_blob_at_index(superblob, index);
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csd_superblob_insert_blob_at_index(superblob, newBlob, index);
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} else {
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csd_superblob_append_blob(superblob, newBlob);
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}
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return 0;
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}
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int csd_superblob_remove_blob(CS_DecodedSuperBlob *superblob, CS_DecodedBlob *blobToRemove)
|
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{
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CS_DecodedBlob *blob = superblob->firstBlob;
|
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if (blob == blobToRemove) {
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superblob->firstBlob = blobToRemove->next;
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return 0;
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}
|
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while (blob) {
|
||||
if (blob->next == blobToRemove) {
|
||||
blob->next = blobToRemove->next;
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||||
return 0;
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||||
}
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blob = blob->next;
|
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}
|
||||
return -1;
|
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}
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||||
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int csd_superblob_remove_blob_at_index(CS_DecodedSuperBlob *superblob, uint32_t atIndex)
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||||
{
|
||||
if (atIndex == 0) {
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return csd_superblob_remove_blob(superblob, superblob->firstBlob);
|
||||
}
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||||
else {
|
||||
uint32_t i = 0;
|
||||
CS_DecodedBlob *blobAtIndex = superblob->firstBlob;
|
||||
while (blobAtIndex && i < atIndex) {
|
||||
blobAtIndex = blobAtIndex->next;
|
||||
i++;
|
||||
}
|
||||
if (blobAtIndex) {
|
||||
int r = csd_superblob_remove_blob(superblob, blobAtIndex);
|
||||
if (r == 0) csd_blob_free(blobAtIndex);
|
||||
return r;
|
||||
}
|
||||
return -1;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
CS_DecodedBlob *csd_superblob_find_best_code_directory(CS_DecodedSuperBlob *decodedSuperblob)
|
||||
{
|
||||
CS_DecodedBlob *bestCDBlob = NULL;
|
||||
unsigned bestCDBlobRank = 0;
|
||||
|
||||
CS_DecodedBlob *blob = decodedSuperblob->firstBlob;
|
||||
while (blob) {
|
||||
if (blob->type == CSSLOT_CODEDIRECTORY || ((CSSLOT_ALTERNATE_CODEDIRECTORIES <= blob->type && blob->type < CSSLOT_ALTERNATE_CODEDIRECTORY_LIMIT))) {
|
||||
unsigned CDBlobRank = csd_code_directory_calculate_rank(blob);
|
||||
if (CDBlobRank > bestCDBlobRank) {
|
||||
bestCDBlob = blob;
|
||||
bestCDBlobRank = CDBlobRank;
|
||||
}
|
||||
}
|
||||
blob = blob->next;
|
||||
}
|
||||
|
||||
return bestCDBlob;
|
||||
}
|
||||
|
||||
int csd_superblob_calculate_best_cdhash(CS_DecodedSuperBlob *decodedSuperblob, void *cdhashOut, int *cdhashTypeOut)
|
||||
{
|
||||
if (!cdhashOut) return -1;
|
||||
CS_DecodedBlob *bestCDBlob = csd_superblob_find_best_code_directory(decodedSuperblob);
|
||||
if (cdhashTypeOut) *cdhashTypeOut = csd_code_directory_get_hash_type(bestCDBlob);
|
||||
return csd_code_directory_calculate_hash(bestCDBlob, cdhashOut);
|
||||
}
|
||||
|
||||
int csd_superblob_print_content(CS_DecodedSuperBlob *decodedSuperblob, MachO *macho, bool printAllSlots, bool verifySlots)
|
||||
{
|
||||
CS_DecodedBlob *currentBlob = decodedSuperblob->firstBlob;
|
||||
int count = 0;
|
||||
uint32_t offset = 0;
|
||||
while (currentBlob) {
|
||||
uint32_t blobType = currentBlob->type;
|
||||
printf("Slot %d: %s (offset 0x%x, type: 0x%x).\n", count++, cs_slot_type_to_string(blobType), offset, blobType);
|
||||
|
||||
if (blobType == CSSLOT_CODEDIRECTORY || blobType == CSSLOT_ALTERNATE_CODEDIRECTORIES) {
|
||||
csd_code_directory_print_content(currentBlob, macho, printAllSlots, verifySlots);
|
||||
}
|
||||
else if (blobType == CSSLOT_SIGNATURESLOT) {
|
||||
CS_GenericBlob *cms_blob = malloc(sizeof(CS_GenericBlob));
|
||||
memset(cms_blob, 0, sizeof(CS_GenericBlob));
|
||||
memory_stream_read(currentBlob->stream, 0, sizeof(CS_GenericBlob), cms_blob);
|
||||
GENERIC_BLOB_APPLY_BYTE_ORDER(cms_blob, BIG_TO_HOST_APPLIER);
|
||||
printf("This is the %s, magic %#x.\n", cs_blob_magic_to_string(cms_blob->magic), cms_blob->magic);
|
||||
}
|
||||
else {
|
||||
CS_GenericBlob *generic_blob = malloc(sizeof(CS_GenericBlob));
|
||||
memset(generic_blob, 0, sizeof(CS_GenericBlob));
|
||||
memory_stream_read(currentBlob->stream, 0, sizeof(CS_GenericBlob), generic_blob);
|
||||
GENERIC_BLOB_APPLY_BYTE_ORDER(generic_blob, BIG_TO_HOST_APPLIER);
|
||||
printf("This is the %s, magic %#x.\n", cs_blob_magic_to_string(generic_blob->magic), generic_blob->magic);
|
||||
}
|
||||
|
||||
offset += csd_blob_get_size(currentBlob);
|
||||
currentBlob = currentBlob->next;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
void csd_superblob_free(CS_DecodedSuperBlob *decodedSuperblob)
|
||||
{
|
||||
CS_DecodedBlob *nextBlob = decodedSuperblob->firstBlob;
|
||||
while (nextBlob) {
|
||||
CS_DecodedBlob *prevBlob = nextBlob;
|
||||
nextBlob = nextBlob->next;
|
||||
csd_blob_free(prevBlob);
|
||||
}
|
||||
free(decodedSuperblob);
|
||||
}
|
||||
Reference in new issue
Block a user