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appx.c
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appx.c
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/*
* APPX file support library
* https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT
*
* Copyright (C) Maciej Panek <maciej.panek_malpa_punxworks.com>
* Copyright (C) 2023 Michał Trojnara <[email protected]>
* Author: Małgorzata Olszówka <[email protected]>
*
* APPX files do not support nesting (multiple signature)
*/
#define _FILE_OFFSET_BITS 64
#include "osslsigncode.h"
#include "helpers.h"
#include <zlib.h>
#include <inttypes.h>
#ifndef PRIX64
#if defined(_MSC_VER)
#define PRIX64 "I64X"
#else /* _MSC_VER */
#if ULONG_MAX == 0xFFFFFFFFFFFFFFFF
#define PRIX64 "lX"
#else /* ULONG_MAX == 0xFFFFFFFFFFFFFFFF */
#define PRIX64 "llX"
#endif /* ULONG_MAX == 0xFFFFFFFFFFFFFFFF */
#endif /* _MSC_VER */
#endif /* PRIX64 */
#if defined(_MSC_VER)
#define fseeko _fseeki64
#define ftello _ftelli64
#endif /* _MSC_VER */
#define EOCDR_SIZE 22
#define ZIP64_EOCD_LOCATOR_SIZE 20
#define ZIP64_HEADER 0x01
#define COMPRESSION_NONE 0
#define COMPRESSION_DEFLATE 8
#define DATA_DESCRIPTOR_BIT (1 << 3)
static const char PKZIP_LH_SIGNATURE[4] = { 'P', 'K', 3, 4 };
static const char PKZIP_CD_SIGNATURE[4] = { 'P', 'K', 1, 2 };
static const char PKZIP_EOCDR_SIGNATURE[4] = { 'P', 'K', 5, 6 };
static const char PKZIP_DATA_DESCRIPTOR_SIGNATURE[4] = { 'P', 'K', 7, 8 };
static const char PKZIP64_EOCD_LOCATOR_SIGNATURE[4] = { 'P', 'K', 6, 7 };
static const char PKZIP64_EOCDR_SIGNATURE[4] = { 'P', 'K', 6, 6 };
static const char *APP_SIGNATURE_FILENAME = "AppxSignature.p7x";
static const char *CONTENT_TYPES_FILENAME = "[Content_Types].xml";
static const char *BLOCK_MAP_FILENAME = "AppxBlockMap.xml";
static const char *APPXBUNDLE_MANIFEST_FILENAME = "AppxMetadata/AppxBundleManifest.xml";
static const char *CODE_INTEGRITY_FILENAME = "AppxMetadata/CodeIntegrity.cat";
static const char *SIGNATURE_CONTENT_TYPES_ENTRY = "<Override PartName=\"/AppxSignature.p7x\" ContentType=\"application/vnd.ms-appx.signature\"/>";
static const char *SIGNATURE_CONTENT_TYPES_CLOSING_TAG = "</Types>";
static const u_char APPX_UUID[] = { 0x4B, 0xDF, 0xC5, 0x0A, 0x07, 0xCE, 0xE2, 0x4D, 0xB7, 0x6E, 0x23, 0xC8, 0x39, 0xA0, 0x9F, 0xD1 };
static const u_char APPXBUNDLE_UUID[] = { 0xB3, 0x58, 0x5F, 0x0F, 0xDE, 0xAA, 0x9A, 0x4B, 0xA4, 0x34, 0x95, 0x74, 0x2D, 0x92, 0xEC, 0xEB };
static const char PKCX_SIGNATURE[4] = { 'P', 'K', 'C', 'X' }; /* P7X format header */
static const char APPX_SIGNATURE[4] = { 'A', 'P', 'P', 'X' }; /* APPX header */
static const char AXPC_SIGNATURE[4] = { 'A', 'X', 'P', 'C' }; /* digest of zip file records */
static const char AXCD_SIGNATURE[4] = { 'A', 'X', 'C', 'D' }; /* digest zip file central directory */
static const char AXCT_SIGNATURE[4] = { 'A', 'X', 'C', 'T' }; /* digest of uncompressed [ContentTypes].xml */
static const char AXBM_SIGNATURE[4] = { 'A', 'X', 'B', 'M' }; /* digest of uncompressed AppxBlockMap.xml */
static const char AXCI_SIGNATURE[4] = { 'A', 'X', 'C', 'I' }; /* digest of uncompressed AppxMetadata/CodeIntegrity.cat (optional) */
static const char *HASH_METHOD_TAG = "HashMethod";
static const char *HASH_METHOD_SHA256 = "http:https://www.w3.org/2001/04/xmlenc#sha256";
static const char *HASH_METHOD_SHA384 = "http:https://www.w3.org/2001/04/xmldsig-more#sha384";
static const char *HASH_METHOD_SHA512 = "http:https://www.w3.org/2001/04/xmlenc#sha512";
/*
* Overall .ZIP file format:
*
* [local file header 1]
* [encryption header 1]
* [file data 1]
* [data descriptor 1]
* .
* .
* .
* [local file header n]
* [encryption header n]
* [file data n]
* [data descriptor n]
* [archive decryption header]
* [archive extra data record]
* [central directory header 1]
* .
* .
* .
* [central directory header n]
* [zip64 end of central directory record]
* [zip64 end of central directory locator]
* [end of central directory record]
*/
/* Local file header */
typedef struct {
uint16_t version;
uint16_t flags;
uint16_t compression;
uint16_t modTime;
uint16_t modDate;
uint32_t crc32;
uint64_t compressedSize;
uint64_t uncompressedSize;
uint16_t fileNameLen;
uint16_t extraFieldLen;
char *fileName;
uint8_t *extraField;
int compressedSizeInZip64;
int uncompressedSizeInZip64;
} ZIP_LOCAL_HEADER;
/* Data descriptor */
typedef struct {
uint32_t crc32;
uint64_t compressedSize;
uint64_t uncompressedSize;
uint8_t *data;
} ZIP_OVERRIDE_DATA;
/* Central directory structure */
typedef struct zipCentralDirectoryEntry_struct {
uint16_t creatorVersion;
uint16_t viewerVersion;
uint16_t flags;
uint16_t compression;
uint16_t modTime;
uint16_t modDate;
uint32_t crc32;
uint64_t compressedSize;
uint64_t uncompressedSize;
uint16_t fileNameLen;
uint16_t extraFieldLen;
uint16_t fileCommentLen;
uint32_t diskNoStart;
uint16_t internalAttr;
uint32_t externalAttr;
uint64_t offsetOfLocalHeader;
char *fileName;
uint8_t *extraField;
char *fileComment;
int64_t fileOffset;
int64_t entryLen;
int compressedSizeInZip64;
int uncompressedSizeInZip64;
int offsetInZip64;
int diskNoInZip64;
ZIP_OVERRIDE_DATA *overrideData;
struct zipCentralDirectoryEntry_struct *next;
} ZIP_CENTRAL_DIRECTORY_ENTRY;
DEFINE_STACK_OF(ZIP_CENTRAL_DIRECTORY_ENTRY)
/* Zip64 end of central directory record */
typedef struct {
uint64_t eocdrSize;
uint16_t creatorVersion;
uint16_t viewerVersion;
uint32_t diskNumber;
uint32_t diskWithCentralDirectory;
uint64_t diskEntries;
uint64_t totalEntries;
uint64_t centralDirectorySize;
uint64_t centralDirectoryOffset;
uint64_t commentLen;
char *comment;
} ZIP64_EOCDR;
/* Zip64 end of central directory locator */
typedef struct {
uint32_t diskWithEOCD;
uint64_t eocdOffset;
uint32_t totalNumberOfDisks;
} ZIP64_EOCD_LOCATOR;
/* End of central directory record */
typedef struct {
uint16_t diskNumber;
uint16_t centralDirectoryDiskNumber;
uint16_t diskEntries;
uint16_t totalEntries;
uint32_t centralDirectorySize;
uint32_t centralDirectoryOffset;
uint16_t commentLen;
char *comment;
} ZIP_EOCDR;
typedef struct {
FILE *file;
ZIP_CENTRAL_DIRECTORY_ENTRY *centralDirectoryHead;
uint64_t centralDirectorySize;
uint64_t centralDirectoryOffset;
uint64_t centralDirectoryRecordCount;
uint64_t eocdrOffset;
int64_t eocdrLen;
int64_t fileSize;
int isZip64;
/* this will come handy to rewrite the eocdr */
ZIP_EOCDR eocdr;
ZIP64_EOCD_LOCATOR locator;
ZIP64_EOCDR eocdr64;
} ZIP_FILE;
typedef struct {
ASN1_INTEGER *a;
ASN1_OCTET_STRING *string;
ASN1_INTEGER *b;
ASN1_INTEGER *c;
ASN1_INTEGER *d;
ASN1_INTEGER *e;
ASN1_INTEGER *f;
} AppxSpcSipInfo;
DECLARE_ASN1_FUNCTIONS(AppxSpcSipInfo)
ASN1_SEQUENCE(AppxSpcSipInfo) = {
ASN1_SIMPLE(AppxSpcSipInfo, a, ASN1_INTEGER),
ASN1_SIMPLE(AppxSpcSipInfo, string, ASN1_OCTET_STRING),
ASN1_SIMPLE(AppxSpcSipInfo, b, ASN1_INTEGER),
ASN1_SIMPLE(AppxSpcSipInfo, c, ASN1_INTEGER),
ASN1_SIMPLE(AppxSpcSipInfo, d, ASN1_INTEGER),
ASN1_SIMPLE(AppxSpcSipInfo, e, ASN1_INTEGER),
ASN1_SIMPLE(AppxSpcSipInfo, f, ASN1_INTEGER),
} ASN1_SEQUENCE_END(AppxSpcSipInfo)
IMPLEMENT_ASN1_FUNCTIONS(AppxSpcSipInfo)
struct appx_ctx_st {
ZIP_FILE *zip;
u_char *calculatedBMHash;
u_char *calculatedCTHash;
u_char *calculatedCDHash;
u_char *calculatedDataHash;
u_char *calculatedCIHash;
u_char *existingBMHash;
u_char *existingCTHash;
u_char *existingCDHash;
u_char *existingDataHash;
u_char *existingCIHash;
int isBundle;
const EVP_MD *md;
int hashlen;
} appx_ctx_t;
/* FILE_FORMAT method prototypes */
static FILE_FORMAT_CTX *appx_ctx_new(GLOBAL_OPTIONS *options, BIO *hash, BIO *outdata);
static const EVP_MD *appx_md_get(FILE_FORMAT_CTX *ctx);
static ASN1_OBJECT *appx_spc_sip_info_get(u_char **p, int *plen, FILE_FORMAT_CTX *ctx);
static PKCS7 *appx_pkcs7_contents_get(FILE_FORMAT_CTX *ctx, BIO *hash, const EVP_MD *md);
static int appx_hash_length_get(FILE_FORMAT_CTX *ctx);
static int appx_verify_digests(FILE_FORMAT_CTX *ctx, PKCS7 *p7);
static PKCS7 *appx_pkcs7_extract(FILE_FORMAT_CTX *ctx);
static int appx_remove_pkcs7(FILE_FORMAT_CTX *ctx, BIO *hash, BIO *outdata);
static int appx_process_data(FILE_FORMAT_CTX *ctx, BIO *hash, BIO *outdata);
static PKCS7 *appx_pkcs7_signature_new(FILE_FORMAT_CTX *ctx, BIO *hash);
static int appx_append_pkcs7(FILE_FORMAT_CTX *ctx, BIO *outdata, PKCS7 *p7);
static void appx_bio_free(BIO *hash, BIO *outdata);
static void appx_ctx_cleanup(FILE_FORMAT_CTX *ctx);
FILE_FORMAT file_format_appx = {
.ctx_new = appx_ctx_new,
.md_get = appx_md_get,
.data_blob_get = appx_spc_sip_info_get,
.pkcs7_contents_get = appx_pkcs7_contents_get,
.hash_length_get = appx_hash_length_get,
.verify_digests = appx_verify_digests,
.pkcs7_extract = appx_pkcs7_extract,
.remove_pkcs7 = appx_remove_pkcs7,
.process_data = appx_process_data,
.pkcs7_signature_new = appx_pkcs7_signature_new,
.append_pkcs7 = appx_append_pkcs7,
.bio_free = appx_bio_free,
.ctx_cleanup = appx_ctx_cleanup,
};
/* Prototypes */
static BIO *appx_calculate_hashes(FILE_FORMAT_CTX *ctx);
static BIO *appx_hash_blob_get(FILE_FORMAT_CTX *ctx);
static uint8_t *appx_calc_zip_central_directory_hash(ZIP_FILE *zip, const EVP_MD *md, uint64_t cdOffset);
static int appx_write_central_directory(BIO *bio, ZIP_FILE *zip, int removeSignature, uint64_t cdOffset);
static uint8_t *appx_calc_zip_data_hash(uint64_t *cdOffset, ZIP_FILE *zip, const EVP_MD *md);
static int appx_extract_hashes(FILE_FORMAT_CTX *ctx, SpcIndirectDataContent *content);
static int appx_compare_hashes(FILE_FORMAT_CTX *ctx);
static int appx_remove_ct_signature_entry(ZIP_FILE *zip, ZIP_CENTRAL_DIRECTORY_ENTRY *entry);
static int appx_append_ct_signature_entry(ZIP_FILE *zip, ZIP_CENTRAL_DIRECTORY_ENTRY *entry);
static const EVP_MD *appx_get_md(ZIP_FILE *zip);
static ZIP_CENTRAL_DIRECTORY_ENTRY *zipGetCDEntryByName(ZIP_FILE *zip, const char *name);
static void zipWriteCentralDirectoryEntry(BIO *bio, uint64_t *sizeOnDisk, ZIP_CENTRAL_DIRECTORY_ENTRY *entry, uint64_t offsetDiff);
static int zipAppendSignatureFile(BIO *bio, ZIP_FILE *zip, uint8_t *data, uint64_t dataSize);
static int zipOverrideFileData(ZIP_CENTRAL_DIRECTORY_ENTRY *entry, uint8_t *data, uint64_t dataSize);
static int zipRewriteData(ZIP_FILE *zip, ZIP_CENTRAL_DIRECTORY_ENTRY *entry, BIO *bio, uint64_t *sizeOnDisk);
static void zipWriteLocalHeader(BIO *bio, uint64_t *sizeonDisk, ZIP_LOCAL_HEADER *heade);
static int zipEntryExist(ZIP_FILE *zip, const char *name);
static u_char *zipCalcDigest(ZIP_FILE *zip, const char *fileName, const EVP_MD *md);
static size_t zipReadFileDataByName(uint8_t **pData, ZIP_FILE *zip, const char *name);
static size_t zipReadFileData(ZIP_FILE *zip, uint8_t **pData, ZIP_CENTRAL_DIRECTORY_ENTRY *entry);
static int zipReadLocalHeader(ZIP_LOCAL_HEADER *header, ZIP_FILE *zip, uint64_t compressedSize);
static int zipInflate(uint8_t *dest, uint64_t *destLen, uint8_t *source, uLong *sourceLen);
static int zipDeflate(uint8_t *dest, uint64_t *destLen, uint8_t *source, uLong sourceLen);
static ZIP_FILE *openZip(const char *filename);
static void freeZip(ZIP_FILE *zip);
static ZIP_FILE *zipSortCentralDirectory(ZIP_FILE *zip);
static void zipPrintCentralDirectory(ZIP_FILE *zip);
static int zipReadCentralDirectory(ZIP_FILE *zip, FILE *file);
static ZIP_CENTRAL_DIRECTORY_ENTRY *zipReadNextCentralDirectoryEntry(FILE *file);
static void freeZipCentralDirectoryEntry(ZIP_CENTRAL_DIRECTORY_ENTRY *entry);
static int readZipEOCDR(ZIP_EOCDR *eocdr, FILE *file);
static int readZip64EOCDLocator(ZIP64_EOCD_LOCATOR *locator, FILE *file);
static int readZip64EOCDR(ZIP64_EOCDR *eocdr, FILE *file, uint64_t offset);
static int get_current_position(BIO *bio, uint64_t *offset);
static uint64_t fileGetU64(FILE *file);
static uint32_t fileGetU32(FILE *file);
static uint16_t fileGetU16(FILE *file);
static uint64_t bufferGetU64(uint8_t *buffer, uint64_t *pos);
static uint32_t bufferGetU32(uint8_t *buffer, uint64_t *pos);
static uint16_t bufferGetU16(uint8_t *buffer, uint64_t *pos);
static void bioAddU64(BIO *bio, uint64_t v);
static void bioAddU32(BIO *bio, uint32_t v);
static void bioAddU16(BIO *bio, uint16_t v);
/*
* FILE_FORMAT method definitions
*/
/*
* Allocate and return a PE file format context.
* [in, out] options: structure holds the input data
* [out] hash: message digest BIO
* [in] outdata: outdata file BIO
* [returns] pointer to PE file format context
*/
static FILE_FORMAT_CTX *appx_ctx_new(GLOBAL_OPTIONS *options, BIO *hash, BIO *outdata)
{
FILE_FORMAT_CTX *ctx;
const EVP_MD *md;
ZIP_FILE *zip = openZip(options->infile);
/* squash unused parameter warnings */
(void)hash;
(void)outdata;
if (!zip) {
return NULL; /* FAILED */
}
if (options->verbose) {
zipPrintCentralDirectory(zip);
}
md = appx_get_md(zip);
if (!md) {
freeZip(zip);
return NULL; /* FAILED */
}
ctx = OPENSSL_malloc(sizeof(FILE_FORMAT_CTX));
ctx->appx_ctx = OPENSSL_zalloc(sizeof(appx_ctx_t));
ctx->appx_ctx->zip = zip;
ctx->format = &file_format_appx;
ctx->options = options;
ctx->appx_ctx->md = md;
if (zipGetCDEntryByName(zip, APPXBUNDLE_MANIFEST_FILENAME)) {
ctx->appx_ctx->isBundle = 1;
}
if (options->cmd == CMD_SIGN || options->cmd==CMD_ATTACH
|| options->cmd==CMD_ADD || options->cmd == CMD_EXTRACT_DATA) {
printf("Warning: Ignore -h option, use the hash algorithm specified in AppxBlockMap.xml\n");
}
if (options->pagehash == 1)
printf("Warning: -ph option is only valid for PE files\n");
if (options->jp >= 0)
printf("Warning: -jp option is only valid for CAB files\n");
if (options->add_msi_dse == 1)
printf("Warning: -add-msi-dse option is only valid for MSI files\n");
return ctx;
}
/*
* Return a hash algorithm specified in the AppxBlockMap.xml file.
* [in] ctx: structure holds input and output data
* [returns] hash algorithm
*/
static const EVP_MD *appx_md_get(FILE_FORMAT_CTX *ctx)
{
return ctx->appx_ctx->md;
}
/*
* Allocate and return SpcSipInfo object.
* [out] p: SpcSipInfo data
* [out] plen: SpcSipInfo data length
* [in] ctx: structure holds input and output data
* [returns] pointer to ASN1_OBJECT structure corresponding to SPC_SIPINFO_OBJID
*/
static ASN1_OBJECT *appx_spc_sip_info_get(u_char **p, int *plen, FILE_FORMAT_CTX *ctx)
{
ASN1_OBJECT *dtype;
AppxSpcSipInfo *si = AppxSpcSipInfo_new();
ASN1_INTEGER_set(si->a, 0x01010000);
ASN1_INTEGER_set(si->b, 0);
ASN1_INTEGER_set(si->c, 0);
ASN1_INTEGER_set(si->d, 0);
ASN1_INTEGER_set(si->e, 0);
ASN1_INTEGER_set(si->f, 0);
if (ctx->appx_ctx->isBundle) {
printf("Signing as a bundle\n");
ASN1_OCTET_STRING_set(si->string, APPXBUNDLE_UUID, sizeof(APPXBUNDLE_UUID));
} else {
printf("Signing as a package\n");
ASN1_OCTET_STRING_set(si->string, APPX_UUID, sizeof(APPX_UUID));
}
*plen = i2d_AppxSpcSipInfo(si, NULL);
*p = OPENSSL_malloc((size_t)*plen);
i2d_AppxSpcSipInfo(si, p);
*p -= *plen;
dtype = OBJ_txt2obj(SPC_SIPINFO_OBJID, 1);
AppxSpcSipInfo_free(si);
return dtype; /* OK */
}
/*
* Allocate and return a data content to be signed.
* [in] ctx: structure holds input and output data
* [in] hash: message digest BIO
* [in] md: message digest algorithm
* [returns] data content
*/
static PKCS7 *appx_pkcs7_contents_get(FILE_FORMAT_CTX *ctx, BIO *hash, const EVP_MD *md)
{
ASN1_OCTET_STRING *content;
ZIP_CENTRAL_DIRECTORY_ENTRY *entry;
BIO *bhash;
/* squash unused parameter warnings */
(void)md;
(void)hash;
/* Create and append a new signature content types entry */
entry = zipGetCDEntryByName(ctx->appx_ctx->zip, CONTENT_TYPES_FILENAME);
if (!entry) {
fprintf(stderr, "Not a valid .appx file: content types file missing\n");
return NULL; /* FAILED */
}
if (!appx_append_ct_signature_entry(ctx->appx_ctx->zip, entry)) {
return NULL; /* FAILED */
}
bhash = appx_calculate_hashes(ctx);
if (!bhash) {
return NULL; /* FAILED */
}
content = spc_indirect_data_content_get(bhash, ctx);
BIO_free_all(bhash);
return pkcs7_set_content(content);
}
/*
* Get concatenated hashes length.
* [in] ctx: structure holds input and output data
* [returns] the length of concatenated hashes
*/
static int appx_hash_length_get(FILE_FORMAT_CTX *ctx)
{
return ctx->appx_ctx->hashlen;
}
/*
* Calculate message digest and compare to value retrieved from PKCS#7 signedData.
* [in] ctx: structure holds input and output data
* [in] p7: PKCS#7 signature
* [returns] 0 on error or 1 on success
*/
static int appx_verify_digests(FILE_FORMAT_CTX *ctx, PKCS7 *p7)
{
if (is_content_type(p7, SPC_INDIRECT_DATA_OBJID)) {
ASN1_STRING *content_val = p7->d.sign->contents->d.other->value.sequence;
const u_char *p = content_val->data;
SpcIndirectDataContent *idc = d2i_SpcIndirectDataContent(NULL, &p, content_val->length);
if (idc) {
BIO *hashes;
if (!appx_extract_hashes(ctx, idc)) {
fprintf(stderr, "Failed to extract hashes from the signature\n");
SpcIndirectDataContent_free(idc);
return 0; /* FAILED */
}
hashes = appx_calculate_hashes(ctx);
if (!hashes) {
SpcIndirectDataContent_free(idc);
return 0; /* FAILED */
}
BIO_free_all(hashes);
if (!appx_compare_hashes(ctx)) {
fprintf(stderr, "Signature hash verification failed\n");
SpcIndirectDataContent_free(idc);
return 0; /* FAILED */
}
SpcIndirectDataContent_free(idc);
}
}
return 1; /* OK */
}
/*
* Extract existing signature in DER format.
* [in] ctx: structure holds input and output data
* [returns] pointer to PKCS#7 structure
*/
static PKCS7 *appx_pkcs7_extract(FILE_FORMAT_CTX *ctx)
{
PKCS7 *p7;
uint8_t *data = NULL;
const u_char *blob;
size_t dataSize;
/* Check if the signature exists */
if (!zipEntryExist(ctx->appx_ctx->zip, APP_SIGNATURE_FILENAME)) {
fprintf(stderr, "%s does not exist\n", APP_SIGNATURE_FILENAME);
return NULL; /* FAILED */
}
dataSize = zipReadFileDataByName(&data, ctx->appx_ctx->zip, APP_SIGNATURE_FILENAME);
if (dataSize <= 0) {
return NULL; /* FAILED */
}
/* P7X format is just 0x504B4358 (PKCX) followed by PKCS#7 data in the DER format */
if (memcmp(data, PKCX_SIGNATURE, 4)) {
fprintf(stderr, "Invalid PKCX header\n");
OPENSSL_free(data);
return NULL; /* FAILED */
}
blob = (u_char *)data + 4;
p7 = d2i_PKCS7(NULL, &blob, (int)dataSize - 4);
OPENSSL_free(data);
return p7;
}
/*
* Remove existing signature.
* [in, out] ctx: structure holds input and output data
* [out] hash: message digest BIO
* [out] outdata: outdata file BIO
* [returns] 1 on error or 0 on success
*/
static int appx_remove_pkcs7(FILE_FORMAT_CTX *ctx, BIO *hash, BIO *outdata)
{
uint8_t *data = NULL;
size_t dataSize;
uint64_t cdOffset, noEntries = 0;
ZIP_FILE *zip = ctx->appx_ctx->zip;
ZIP_CENTRAL_DIRECTORY_ENTRY *entry = zipGetCDEntryByName(zip, CONTENT_TYPES_FILENAME);
/* squash the unused parameter warning */
(void)hash;
if (!entry) {
fprintf(stderr, "Not a valid .appx file: content types file missing\n");
return 1; /* FAILED */
}
/* read signature data */
dataSize = zipReadFileDataByName(&data, ctx->appx_ctx->zip, APP_SIGNATURE_FILENAME);
if (dataSize <= 0) {
return 1; /* FAILED, no signature */
}
OPENSSL_free(data);
if (!appx_remove_ct_signature_entry(zip, entry)) {
fprintf(stderr, "Failed to remove signature entry\n");
return 1; /* FAILED */
}
for (entry = zip->centralDirectoryHead; entry != NULL; entry = entry->next) {
if (noEntries == zip->centralDirectoryRecordCount) {
fprintf(stderr, "Corrupted central directory structure\n");
return 1; /* FAILED */
}
noEntries++;
if (!entry->fileName || (entry->fileNameLen == 0)) {
fprintf(stderr, "Corrupted file name\n");
return 1; /* FAILED */
}
if (strcmp(entry->fileName, APP_SIGNATURE_FILENAME)) {
uint64_t dummy;
if (!zipRewriteData(zip, entry, outdata, &dummy)) {
return 1; /* FAILED */
}
}
}
if (!get_current_position(outdata, &cdOffset)) {
fprintf(stderr, "Unable to get offset\n");
return 1; /* FAILED */
}
if (!appx_write_central_directory(outdata, zip, 1, cdOffset)) {
fprintf(stderr, "Unable to write central directory\n");
return 1; /* FAILED */
}
return 0; /* OK */
}
/*
* Modify specific type data.
* [in, out] ctx: structure holds input and output data
* [out] hash: message digest BIO (unused)
* [out] outdata: outdata file BIO (unused)
* [returns] 1 on error or 0 on success
*/
static int appx_process_data(FILE_FORMAT_CTX *ctx, BIO *hash, BIO *outdata)
{
ZIP_CENTRAL_DIRECTORY_ENTRY *entry;
/* squash unused parameter warnings */
(void)outdata;
(void)hash;
/* Create and append a new signature content types entry */
entry = zipGetCDEntryByName(ctx->appx_ctx->zip, CONTENT_TYPES_FILENAME);
if (!entry) {
fprintf(stderr, "Not a valid .appx file: content types file missing\n");
return 0; /* FAILED */
}
if (!appx_append_ct_signature_entry(ctx->appx_ctx->zip, entry)) {
return 0; /* FAILED */
}
return 1; /* OK */
}
/*
* Create a new PKCS#7 signature.
* [in, out] ctx: structure holds input and output data
* [out] hash: message digest BIO (unused)
* [returns] pointer to PKCS#7 structure
*/
static PKCS7 *appx_pkcs7_signature_new(FILE_FORMAT_CTX *ctx, BIO *hash)
{
ASN1_OCTET_STRING *content;
PKCS7 *p7 = NULL;
BIO *hashes;
/* squash unused parameter warnings */
(void)hash;
/* Create hash blob from concatenated APPX hashes */
hashes = appx_calculate_hashes(ctx);
if (!hashes) {
return NULL; /* FAILED */
}
p7 = pkcs7_create(ctx);
if (!p7) {
fprintf(stderr, "Creating a new signature failed\n");
BIO_free_all(hashes);
return NULL; /* FAILED */
}
if (!add_indirect_data_object(p7)) {
fprintf(stderr, "Adding SPC_INDIRECT_DATA_OBJID failed\n");
PKCS7_free(p7);
BIO_free_all(hashes);
return NULL; /* FAILED */
}
content = spc_indirect_data_content_get(hashes, ctx);
BIO_free_all(hashes);
if (!content) {
fprintf(stderr, "Failed to get spcIndirectDataContent\n");
PKCS7_free(p7);
return NULL; /* FAILED */
}
if (!sign_spc_indirect_data_content(p7, content)) {
fprintf(stderr, "Failed to set signed content\n");
PKCS7_free(p7);
ASN1_OCTET_STRING_free(content);
return NULL; /* FAILED */
}
ASN1_OCTET_STRING_free(content);
return p7; /* OK */
}
/*
* Append signature to the outfile.
* [in, out] ctx: structure holds input and output data
* [out] outdata: outdata file BIO
* [in] p7: PKCS#7 signature
* [returns] 1 on error or 0 on success
*/
static int appx_append_pkcs7(FILE_FORMAT_CTX *ctx, BIO *outdata, PKCS7 *p7)
{
ZIP_FILE *zip = ctx->appx_ctx->zip;
ZIP_CENTRAL_DIRECTORY_ENTRY *prev = NULL;
ZIP_CENTRAL_DIRECTORY_ENTRY *last = NULL;
ZIP_CENTRAL_DIRECTORY_ENTRY *entry;
u_char *blob, *der = NULL;
int len;
uint64_t cdOffset, noEntries = 0;
for (entry = zip->centralDirectoryHead; entry != NULL;) {
if (noEntries >= zip->centralDirectoryRecordCount) {
fprintf(stderr, "Corrupted central directory structure\n");
return 1; /* FAILED */
}
noEntries++;
last = entry;
if (!entry->fileName || (entry->fileNameLen == 0)) {
fprintf(stderr, "Corrupted file name\n");
return 1; /* FAILED */
}
if (strcmp(entry->fileName, APP_SIGNATURE_FILENAME)) {
uint64_t dummy = 0;
if (!zipRewriteData(zip, entry, outdata, &dummy)) {
return 1; /* FAILED */
}
prev = entry;
entry = entry->next;
} else {
/* remove the entry
* actually this code is pretty naive - if you remove the entry that was not at the end
* everything will go south - the offsets in the CD will not match the local header offsets.
* that can be fixed here or left as is - signtool and this tool always appends the signature file at the end.
* Might be a problem when someone decides to unpack & repack the .appx zip file */
ZIP_CENTRAL_DIRECTORY_ENTRY *current = entry;
entry = entry->next;
if (prev) {
prev->next = entry;
}
freeZipCentralDirectoryEntry(current);
}
}
if (!last) {
/* not really possible unless an empty zip file, but who knows */
return 1; /* FAILED */
}
/* create the signature entry */
if (((len = i2d_PKCS7(p7, NULL)) <= 0) ||
(der = OPENSSL_malloc((size_t)len)) == NULL)
return 1; /* FAILED */
i2d_PKCS7(p7, &der);
der -= len;
blob = OPENSSL_malloc((size_t)(len + 4));
memcpy(blob, PKCX_SIGNATURE, 4);
memcpy(blob + 4, der, (size_t)len);
len += 4;
if (!zipAppendSignatureFile(outdata, zip, blob, (uint64_t)len)) {
OPENSSL_free(blob);
fprintf(stderr, "Failed to append zip file\n");
return 1; /* FAILED */
}
OPENSSL_free(der);
OPENSSL_free(blob);
if (!get_current_position(outdata, &cdOffset)) {
fprintf(stderr, "Unable to get offset\n");
return 1; /* FAILED */
}
if (!appx_write_central_directory(outdata, zip, 0, cdOffset)) {
fprintf(stderr, "Unable to write central directory\n");
return 1; /* FAILED */
}
return 0; /* OK */
}
/*
* Free up an entire message digest BIO chain.
* [out] hash: message digest BIO
* [out] outdata: outdata file BIO
* [returns] none
*/
static void appx_bio_free(BIO *hash, BIO *outdata)
{
BIO_free_all(outdata);
BIO_free_all(hash);
}
/*
* Deallocate a FILE_FORMAT_CTX structure and PE format specific structure.
* [out] ctx: structure holds input and output data
* [out] hash: message digest BIO
* [in] outdata: outdata file BIO
* [returns] none
*/
static void appx_ctx_cleanup(FILE_FORMAT_CTX *ctx)
{
freeZip(ctx->appx_ctx->zip);
OPENSSL_free(ctx->appx_ctx->calculatedBMHash);
OPENSSL_free(ctx->appx_ctx->calculatedCTHash);
OPENSSL_free(ctx->appx_ctx->calculatedCDHash);
OPENSSL_free(ctx->appx_ctx->calculatedDataHash);
OPENSSL_free(ctx->appx_ctx->calculatedCIHash);
OPENSSL_free(ctx->appx_ctx->existingBMHash);
OPENSSL_free(ctx->appx_ctx->existingCTHash);
OPENSSL_free(ctx->appx_ctx->existingCDHash);
OPENSSL_free(ctx->appx_ctx->existingDataHash);
OPENSSL_free(ctx->appx_ctx->existingCIHash);
OPENSSL_free(ctx->appx_ctx);
OPENSSL_free(ctx);
}
/*
* APPX helper functions
*/
/*
* Calculate ZIP hashes.
* [in, out] ctx: structure holds input and output data
* [returns] pointer to BIO with calculated APPX hashes
*/
static BIO *appx_calculate_hashes(FILE_FORMAT_CTX *ctx)
{
uint64_t cdOffset = 0;
ctx->appx_ctx->calculatedBMHash = zipCalcDigest(ctx->appx_ctx->zip, BLOCK_MAP_FILENAME, ctx->appx_ctx->md);
ctx->appx_ctx->calculatedCTHash = zipCalcDigest(ctx->appx_ctx->zip, CONTENT_TYPES_FILENAME, ctx->appx_ctx->md);
ctx->appx_ctx->calculatedDataHash = appx_calc_zip_data_hash(&cdOffset, ctx->appx_ctx->zip, ctx->appx_ctx->md);
ctx->appx_ctx->calculatedCDHash = appx_calc_zip_central_directory_hash(ctx->appx_ctx->zip, ctx->appx_ctx->md, cdOffset);
ctx->appx_ctx->calculatedCIHash = zipCalcDigest(ctx->appx_ctx->zip, CODE_INTEGRITY_FILENAME, ctx->appx_ctx->md);
if (!ctx->appx_ctx->calculatedBMHash || !ctx->appx_ctx->calculatedCTHash
|| !ctx->appx_ctx->calculatedCDHash || !ctx->appx_ctx->calculatedDataHash) {
fprintf(stderr, "One or more hashes calculation failed\n");
return NULL; /* FAILED */
}
if (zipEntryExist(ctx->appx_ctx->zip, CODE_INTEGRITY_FILENAME) && !ctx->appx_ctx->calculatedCIHash) {
fprintf(stderr, "Code integrity file exists, but CI hash calculation failed\n");
return NULL; /* FAILED */
}
return appx_hash_blob_get(ctx);
}
/*
* Create hash blob from concatenated APPX hashes.
* [in] ctx: structure holds input and output data
* [returns] pointer to BIO with calculated APPX hashes
*/
static BIO *appx_hash_blob_get(FILE_FORMAT_CTX *ctx)
{
int mdlen = EVP_MD_size(ctx->appx_ctx->md);
int dataSize = ctx->appx_ctx->calculatedCIHash ? 4 + 5 * (mdlen + 4) : 4 + 4 * (mdlen + 4);
u_char *data = OPENSSL_malloc((size_t)dataSize);
int pos = 0;
BIO *hashes = BIO_new(BIO_s_mem());
memcpy(data + pos, APPX_SIGNATURE, 4);
pos += 4;
memcpy(data + pos, AXPC_SIGNATURE, 4);
pos += 4;
memcpy(data + pos, ctx->appx_ctx->calculatedDataHash, (size_t)mdlen);
pos += mdlen;
memcpy(data + pos, AXCD_SIGNATURE, 4);
pos += 4;
memcpy(data + pos, ctx->appx_ctx->calculatedCDHash, (size_t)mdlen);
pos += mdlen;
memcpy(data + pos, AXCT_SIGNATURE, 4);
pos += 4;
memcpy(data + pos, ctx->appx_ctx->calculatedCTHash, (size_t)mdlen);
pos += mdlen;
memcpy(data + pos, AXBM_SIGNATURE, 4);
pos += 4;
memcpy(data + pos, ctx->appx_ctx->calculatedBMHash, (size_t)mdlen);
pos += mdlen;
if (ctx->appx_ctx->calculatedCIHash) {
memcpy(data + pos, AXCI_SIGNATURE, 4);
pos += 4;
memcpy(data + pos, ctx->appx_ctx->calculatedCIHash, (size_t)mdlen);
pos += mdlen;
}
if (ctx->options->verbose) {
print_hash("Hash of file: ", "\n", data, pos);
}
ctx->appx_ctx->hashlen = BIO_write(hashes, data, pos);
OPENSSL_free(data);
return hashes;
}
/*
* Calculate ZIP central directory hash.
* [in] zip: structure holds specific ZIP data
* [in] md: message digest algorithm type
* [in] cdOffset: central directory offset
* [returns] hash
*/
static uint8_t *appx_calc_zip_central_directory_hash(ZIP_FILE *zip, const EVP_MD *md, uint64_t cdOffset)
{
u_char *mdbuf = NULL;
BIO *bhash = BIO_new(BIO_f_md());
if (!BIO_set_md(bhash, md)) {
fprintf(stderr, "Unable to set the message digest of BIO\n");
BIO_free_all(bhash);
return NULL; /* FAILED */
}
BIO_push(bhash, BIO_new(BIO_s_null()));
if (!appx_write_central_directory(bhash, zip, 1, cdOffset)) {
fprintf(stderr, "Unable to write central directory\n");
BIO_free_all(bhash);
return NULL; /* FAILED */
}
mdbuf = OPENSSL_malloc((size_t)EVP_MD_size(md));
BIO_gets(bhash, (char*)mdbuf, EVP_MD_size(md));
BIO_free_all(bhash);
return mdbuf;
}
/*
* Write central directory structure.
* [out] bio: outdata file BIO
* [in] zip: structure holds specific ZIP data
* [in] removeSignature: remove signature switch
* [in] cdOffset: central directory offset
* [returns] 0 on error or 1 on success
*/
static int appx_write_central_directory(BIO *bio, ZIP_FILE *zip, int removeSignature, uint64_t cdOffset)
{
ZIP_CENTRAL_DIRECTORY_ENTRY *entry;
uint64_t offsetDiff = 0, cdSize = 0;
uint16_t noEntries = 0;
for (entry = zip->centralDirectoryHead; entry != NULL; entry = entry->next) {
/* the signature file is considered non existent for hashing purposes */
uint64_t sizeOnDisk = 0;
if (noEntries > zip->centralDirectoryRecordCount) {
fprintf(stderr, "Corrupted central directory structure\n");
return 0; /* FAILED */
}
if (!entry->fileName || (entry->fileNameLen == 0)) {
fprintf(stderr, "Corrupted file name\n");
return 0; /* FAILED */
}
if (removeSignature && !strcmp(entry->fileName, APP_SIGNATURE_FILENAME)) {
continue;
}
/* APP_SIGNATURE is nt 'tainted' by offset shift after replacing the contents of [content_types] */
zipWriteCentralDirectoryEntry(bio, &sizeOnDisk, entry, strcmp(entry->fileName, APP_SIGNATURE_FILENAME) ? offsetDiff : 0);
cdSize += sizeOnDisk;
if (entry->overrideData) {
offsetDiff += entry->overrideData->compressedSize - entry->compressedSize;
}
noEntries++;
}
if (zip->isZip64) {
/* eocdr */
BIO_write(bio, PKZIP64_EOCDR_SIGNATURE, 4);
bioAddU64(bio, zip->eocdr64.eocdrSize);
bioAddU16(bio, zip->eocdr64.creatorVersion);
bioAddU16(bio, zip->eocdr64.viewerVersion);
bioAddU32(bio, zip->eocdr64.diskNumber);
bioAddU32(bio, zip->eocdr64.diskWithCentralDirectory);
bioAddU64(bio, (uint64_t)noEntries);
bioAddU64(bio, (uint64_t)noEntries);
bioAddU64(bio, cdSize);
bioAddU64(bio, cdOffset);
if (zip->eocdr64.commentLen > 0) {
size_t check;
if (!BIO_write_ex(bio, zip->eocdr64.comment, zip->eocdr64.commentLen, &check)
|| check != zip->eocdr64.commentLen) {
return 0; /* FAILED */
}
}
/* eocdr locator */
BIO_write(bio, PKZIP64_EOCD_LOCATOR_SIGNATURE, 4);
bioAddU32(bio, zip->locator.diskWithEOCD);
bioAddU64(bio, cdOffset + cdSize);
bioAddU32(bio, zip->locator.totalNumberOfDisks);
}
BIO_write(bio, PKZIP_EOCDR_SIGNATURE, 4);
/* those need to be 0s even though packaging tool writes FFFFs here
* it will fail verification if not zeros */
bioAddU16(bio, 0);
bioAddU16(bio, 0);
if (zip->eocdr.diskEntries != UINT16_MAX) {
bioAddU16(bio, noEntries);
} else {
bioAddU16(bio, UINT16_MAX);
}
if (zip->eocdr.totalEntries != UINT16_MAX) {
bioAddU16(bio, noEntries);
} else {
bioAddU16(bio, UINT16_MAX);
}
if (zip->eocdr.centralDirectorySize != UINT32_MAX) {
bioAddU32(bio, (uint32_t)cdSize);
} else {
bioAddU32(bio, UINT32_MAX);
}
if (zip->eocdr.centralDirectoryOffset != UINT32_MAX) {
bioAddU32(bio, (uint32_t)cdOffset);
} else {
bioAddU32(bio, UINT32_MAX);
}
bioAddU16(bio, zip->eocdr.commentLen);
if (zip->eocdr.commentLen > 0) {
BIO_write(bio, zip->eocdr.comment, zip->eocdr.commentLen);
}
return 1; /* OK */
}
/*
* Calculate ZIP data hash.
* [out] cdOffset: central directory offset
* [in] zip: structure holds specific ZIP data
* [in] md: message digest algorithm type
* [returns] hash
*/