/*-
* Copyright (c) 2004-2013 Tim Kientzle
* Copyright (c) 2011-2012,2014 Michihiro NAKAJIMA
* Copyright (c) 2013 Konrad Kleine
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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(S) 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 "archive_platform.h"
__FBSDID("$FreeBSD: head/lib/libarchive/archive_read_support_format_zip.c 201102 2009-12-28 03:11:36Z kientzle $");
/*
* The definitive documentation of the Zip file format is:
* http://www.pkware.com/documents/casestudies/APPNOTE.TXT
*
* The Info-Zip project has pioneered various extensions to better
* support Zip on Unix, including the 0x5455 "UT", 0x5855 "UX", 0x7855
* "Ux", and 0x7875 "ux" extensions for time and ownership
* information.
*
* History of this code: The streaming Zip reader was first added to
* libarchive in January 2005. Support for seekable input sources was
* added in Nov 2011. Zip64 support (including a significant code
* refactoring) was added in 2014.
*/
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_ZLIB_H
#include <zlib.h>
#endif
#include "archive.h"
#include "archive_digest_private.h"
#include "archive_cryptor_private.h"
#include "archive_endian.h"
#include "archive_entry.h"
#include "archive_entry_locale.h"
#include "archive_hmac_private.h"
#include "archive_private.h"
#include "archive_rb.h"
#include "archive_read_private.h"
#ifndef HAVE_ZLIB_H
#include "archive_crc32.h"
#endif
struct zip_entry {
struct archive_rb_node node;
struct zip_entry *next;
int64_t local_header_offset;
int64_t compressed_size;
int64_t uncompressed_size;
int64_t gid;
int64_t uid;
struct archive_string rsrcname;
time_t mtime;
time_t atime;
time_t ctime;
uint32_t crc32;
uint16_t mode;
uint16_t zip_flags; /* From GP Flags Field */
unsigned char compression;
unsigned char system; /* From "version written by" */
unsigned char flags; /* Our extra markers. */
unsigned char decdat;/* Used for Decryption check */
/* WinZip AES encryption extra field should be available
* when compression is 99. */
struct {
/* Vendor version: AE-1 - 0x0001, AE-2 - 0x0002 */
unsigned vendor;
#define AES_VENDOR_AE_1 0x0001
#define AES_VENDOR_AE_2 0x0002
/* AES encryption strength:
* 1 - 128 bits, 2 - 192 bits, 2 - 256 bits. */
unsigned strength;
/* Actual compression method. */
unsigned char compression;
} aes_extra;
};
struct trad_enc_ctx {
uint32_t keys[3];
};
/* Bits used in zip_flags. */
#define ZIP_ENCRYPTED (1 << 0)
#define ZIP_LENGTH_AT_END (1 << 3)
#define ZIP_STRONG_ENCRYPTED (1 << 6)
#define ZIP_UTF8_NAME (1 << 11)
/* See "7.2 Single Password Symmetric Encryption Method"
in http://www.pkware.com/documents/casestudies/APPNOTE.TXT */
#define ZIP_CENTRAL_DIRECTORY_ENCRYPTED (1 << 13)
/* Bits used in flags. */
#define LA_USED_ZIP64 (1 << 0)
#define LA_FROM_CENTRAL_DIRECTORY (1 << 1)
/*
* See "WinZip - AES Encryption Information"
* http://www.winzip.com/aes_info.htm
*/
/* Value used in compression method. */
#define WINZIP_AES_ENCRYPTION 99
/* Authentication code size. */
#define AUTH_CODE_SIZE 10
/**/
#define MAX_DERIVED_KEY_BUF_SIZE (AES_MAX_KEY_SIZE * 2 + 2)
struct zip {
/* Structural information about the archive. */
struct archive_string format_name;
int64_t central_directory_offset;
size_t central_directory_entries_total;
size_t central_directory_entries_on_this_disk;
int has_encrypted_entries;
/* List of entries (seekable Zip only) */
struct zip_entry *zip_entries;
struct archive_rb_tree tree;
struct archive_rb_tree tree_rsrc;
/* Bytes read but not yet consumed via __archive_read_consume() */
size_t unconsumed;
/* Information about entry we're currently reading. */
struct zip_entry *entry;
int64_t entry_bytes_remaining;
/* These count the number of bytes actually read for the entry. */
int64_t entry_compressed_bytes_read;
int64_t entry_uncompressed_bytes_read;
/* Running CRC32 of the decompressed data */
unsigned long entry_crc32;
unsigned long (*crc32func)(unsigned long, const void *,
size_t);
char ignore_crc32;
/* Flags to mark progress of decompression. */
char decompress_init;
char end_of_entry;
#ifdef HAVE_ZLIB_H
unsigned char *uncompressed_buffer;
size_t uncompressed_buffer_size;
z_stream stream;
char stream_valid;
#endif
struct archive_string_conv *sconv;
struct archive_string_conv *sconv_default;
struct archive_string_conv *sconv_utf8;
int init_default_conversion;
int process_mac_extensions;
char init_decryption;
/* Decryption buffer. */
/*
* The decrypted data starts at decrypted_ptr and
* extends for decrypted_bytes_remaining. Decryption
* adds new data to the end of this block, data is returned
* to clients from the beginning. When the block hits the
* end of decrypted_buffer, it has to be shuffled back to
* the beginning of the buffer.
*/
unsigned char *decrypted_buffer;
unsigned char *decrypted_ptr;
size_t decrypted_buffer_size;
size_t decrypted_bytes_remaining;
size_t decrypted_unconsumed_bytes;
/* Traditional PKWARE decryption. */
struct trad_enc_ctx tctx;
char tctx_valid;
/* WinZip AES decryption. */
/* Contexts used for AES decryption. */
archive_crypto_ctx cctx;
char cctx_valid;
archive_hmac_sha1_ctx hctx;
char hctx_valid;
/* Strong encryption's decryption header information. */
unsigned iv_size;
unsigned alg_id;
unsigned bit_len;
unsigned flags;
unsigned erd_size;
unsigned v_size;
unsigned v_crc32;
uint8_t *iv;
uint8_t *erd;
uint8_t *v_data;
};
/* Many systems define min or MIN, but not all. */
#define zipmin(a,b) ((a) < (b) ? (a) : (b))
/* ------------------------------------------------------------------------ */
/*
Traditional PKWARE Decryption functions.
*/
static void
trad_enc_update_keys(struct trad_enc_ctx *ctx, uint8_t c)
{
uint8_t t;
#define CRC32(c, b) (crc32(c ^ 0xffffffffUL, &b, 1) ^ 0xffffffffUL)
ctx->keys[0] = CRC32(ctx->keys[0], c);
ctx->keys[1] = (ctx->keys[1] + (ctx->keys[0] & 0xff)) * 134775813L + 1;
t = (ctx->keys[1] >> 24) & 0xff;
ctx->keys[2] = CRC32(ctx->keys[2], t);
#undef CRC32
}
static uint8_t
trad_enc_decrypt_byte(struct trad_enc_ctx *ctx)
{
unsigned temp = ctx->keys[2] | 2;
return (uint8_t)((temp * (temp ^ 1)) >> 8) & 0xff;
}
static void
trad_enc_decrypt_update(struct trad_enc_ctx *ctx, const uint8_t *in,
size_t in_len, uint8_t *out, size_t out_len)
{
unsigned i, max;
max = (unsigned)((in_len < out_len)? in_len: out_len);
for (i = 0; i < max; i++) {
uint8_t t = in[i] ^ trad_enc_decrypt_byte(ctx);
out[i] = t;
trad_enc_update_keys(ctx, t);
}
}
static int
trad_enc_init(struct trad_enc_ctx *ctx, const char *pw, size_t pw_len,
const uint8_t *key, size_t key_len, uint8_t *crcchk)
{
uint8_t header[12];
if (key_len < 12) {
*crcchk = 0xff;
return -1;
}
ctx->keys[0] = 305419896L;
ctx->keys[1] = 591751049L;
ctx->keys[2] = 878082192L;
for (;pw_len; --pw_len)
trad_enc_update_keys(ctx, *pw++);
trad_enc_decrypt_update(ctx, key, 12, header, 12);
/* Return the last byte for CRC check. */
*crcchk = header[11];
return 0;
}
#if 0
static void
crypt_derive_key_sha1(const void *p, int size, unsigned char *key,
int key_size)
{
#define MD_SIZE 20
archive_sha1_ctx ctx;
unsigned char md1[MD_SIZE];
unsigned char md2[MD_SIZE * 2];
unsigned char mkb[64];
int i;
archive_sha1_init(&ctx);
archive_sha1_update(&ctx, p, size);
archive_sha1_final(&ctx, md1);
memset(mkb, 0x36, sizeof(mkb));
for (i = 0; i < MD_SIZE; i++)
mkb[i] ^= md1[i];
archive_sha1_init(&ctx);
archive_sha1_update(&ctx, mkb, sizeof(mkb));
archive_sha1_final(&ctx, md2);
memset(mkb, 0x5C, sizeof(mkb));
for (i = 0; i < MD_SIZE; i++)
mkb[i] ^= md1[i];
archive_sha1_init(&ctx);
archive_sha1_update(&ctx, mkb, sizeof(mkb));
archive_sha1_final(&ctx, md2 + MD_SIZE);
if (key_size > 32)
key_size = 32;
memcpy(key, md2, key_size);
#undef MD_SIZE
}
#endif
/*
* Common code for streaming or seeking modes.
*
* Includes code to read local file headers, decompress data
* from entry bodies, and common API.
*/
static unsigned long
real_crc32(unsigned long crc, const void *buff, size_t len)
{
return crc32(crc, buff, (unsigned int)len);
}
/* Used by "ignorecrc32" option to speed up tests. */
static unsigned long
fake_crc32(unsigned long crc, const void *buff, size_t len)
{
(void)crc; /* UNUSED */
(void)buff; /* UNUSED */
(void)len; /* UNUSED */
return 0;
}
static const struct {
int id;
const char * name;
} compression_methods[] = {
{0, "uncompressed"}, /* The file is stored (no compression) */
{1, "shrinking"}, /* The file is Shrunk */
{2, "reduced-1"}, /* The file is Reduced with compression factor 1 */
{3, "reduced-2"}, /* The file is Reduced with compression factor 2 */
{4, "reduced-3"}, /* The file is Reduced with compression factor 3 */
{5, "reduced-4"}, /* The file is Reduced with compression factor 4 */
{6, "imploded"}, /* The file is Imploded */
{7, "reserved"}, /* Reserved for Tokenizing compression algorithm */
{8, "deflation"}, /* The file is Deflated */
{9, "deflation-64-bit"}, /* Enhanced Deflating using Deflate64(tm) */
{10, "ibm-terse"},/* PKWARE Data Compression Library Imploding
* (old IBM TERSE) */
{11, "reserved"}, /* Reserved by PKWARE */
{12, "bzip"}, /* File is compressed using BZIP2 algorithm */
{13, "reserved"}, /* Reserved by PKWARE */
{14, "lzma"}, /* LZMA (EFS) */
{15, "reserved"}, /* Reserved by PKWARE */
{16, "reserved"}, /* Reserved by PKWARE */
{17, "reserved"}, /* Reserved by PKWARE */
{18, "ibm-terse-new"}, /* File is compressed using IBM TERSE (new) */
{19, "ibm-lz777"},/* IBM LZ77 z Architecture (PFS) */
{97, "wav-pack"}, /* WavPack compressed data */
{98, "ppmd-1"}, /* PPMd version I, Rev 1 */
{99, "aes"} /* WinZip AES encryption */
};
static const char *
compression_name(const int compression)
{
static const int num_compression_methods =
sizeof(compression_methods)/sizeof(compression_methods[0]);
int i=0;
while(compression >= 0 && i < num_compression_methods) {
if (compression_methods[i].id == compression)
return compression_methods[i].name;
i++;
}
return "??";
}
/* Convert an MSDOS-style date/time into Unix-style time. */
static time_t
zip_time(const char *p)
{
int msTime, msDate;
struct tm ts;
msTime = (0xff & (unsigned)p[0]) + 256 * (0xff & (unsigned)p[1]);
msDate = (0xff & (unsigned)p[2]) + 256 * (0xff & (unsigned)p[3]);
memset(&ts, 0, sizeof(ts));
ts.tm_year = ((msDate >> 9) & 0x7f) + 80; /* Years since 1900. */
ts.tm_mon = ((msDate >> 5) & 0x0f) - 1; /* Month number. */
ts.tm_mday = msDate & 0x1f; /* Day of month. */
ts.tm_hour = (msTime >> 11) & 0x1f;
ts.tm_min = (msTime >> 5) & 0x3f;
ts.tm_sec = (msTime << 1) & 0x3e;
ts.tm_isdst = -1;
return mktime(&ts);
}
/*
* The extra data is stored as a list of
* id1+size1+data1 + id2+size2+data2 ...
* triplets. id and size are 2 bytes each.
*/
static int
process_extra(struct archive_read *a, const char *p, size_t extra_length, struct zip_entry* zip_entry)
{
unsigned offset = 0;
if (extra_length == 0) {
return ARCHIVE_OK;
}
if (extra_length < 4) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Too-small extra data: Need at least 4 bytes, but only found %d bytes", (int)extra_length);
return ARCHIVE_FAILED;
}
while (offset <= extra_length - 4) {
unsigned short headerid = archive_le16dec(p + offset);
unsigned short datasize = archive_le16dec(p + offset + 2);
offset += 4;
if (offset + datasize > extra_length) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Extra data overflow: Need %d bytes but only found %d bytes",
(int)datasize, (int)(extra_length - offset));
return ARCHIVE_FAILED;
}
#ifdef DEBUG
fprintf(stderr, "Header id 0x%04x, length %d\n",
headerid, datasize);
#endif
switch (headerid) {
case 0x0001:
/* Zip64 extended information extra field. */
zip_entry->flags |= LA_USED_ZIP64;
if (zip_entry->uncompressed_size == 0xffffffff) {
uint64_t t = 0;
if (datasize < 8
|| (t = archive_le64dec(p + offset)) > INT64_MAX) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Malformed 64-bit uncompressed size");
return ARCHIVE_FAILED;
}
zip_entry->uncompressed_size = t;
offset += 8;
datasize -= 8;
}
if (zip_entry->compressed_size == 0xffffffff) {
uint64_t t = 0;
if (datasize < 8
|| (t = archive_le64dec(p + offset)) > INT64_MAX) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Malformed 64-bit compressed size");
return ARCHIVE_FAILED;
}
zip_entry->compressed_size = t;
offset += 8;
datasize -= 8;
}
if (zip_entry->local_header_offset == 0xffffffff) {
uint64_t t = 0;
if (datasize < 8
|| (t = archive_le64dec(p + offset)) > INT64_MAX) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Malformed 64-bit local header offset");
return ARCHIVE_FAILED;
}
zip_entry->local_header_offset = t;
offset += 8;
datasize -= 8;
}
/* archive_le32dec(p + offset) gives disk
* on which file starts, but we don't handle
* multi-volume Zip files. */
break;
#ifdef DEBUG
case 0x0017:
{
/* Strong encryption field. */
if (archive_le16dec(p + offset) == 2) {
unsigned algId =
archive_le16dec(p + offset + 2);
unsigned bitLen =
archive_le16dec(p + offset + 4);
int flags =
archive_le16dec(p + offset + 6);
fprintf(stderr, "algId=0x%04x, bitLen=%u, "
"flgas=%d\n", algId, bitLen,flags);
}
break;
}
#endif
case 0x5455:
{
/* Extended time field "UT". */
int flags;
if (datasize == 0) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Incomplete extended time field");
return ARCHIVE_FAILED;
}
flags = p[offset];
offset++;
datasize--;
/* Flag bits indicate which dates are present. */
if (flags & 0x01)
{
#ifdef DEBUG
fprintf(stderr, "mtime: %lld -> %d\n",
(long long)zip_entry->mtime,
archive_le32dec(p + offset));
#endif
if (datasize < 4)
break;
zip_entry->mtime = archive_le32dec(p + offset);
offset += 4;
datasize -= 4;
}
if (flags & 0x02)
{
if (datasize < 4)
break;
zip_entry->atime = archive_le32dec(p + offset);
offset += 4;
datasize -= 4;
}
if (flags & 0x04)
{
if (datasize < 4)
break;
zip_entry->ctime = archive_le32dec(p + offset);
offset += 4;
datasize -= 4;
}
break;
}
case 0x5855:
{
/* Info-ZIP Unix Extra Field (old version) "UX". */
if (datasize >= 8) {
zip_entry->atime = archive_le32dec(p + offset);
zip_entry->mtime =
archive_le32dec(p + offset + 4);
}
if (datasize >= 12) {
zip_entry->uid =
archive_le16dec(p + offset + 8);
zip_entry->gid =
archive_le16dec(p + offset + 10);
}
break;
}
case 0x6c78:
{
/* Experimental 'xl' field */
/*
* Introduced Dec 2013 to provide a way to
* include external file attributes (and other
* fields that ordinarily appear only in
* central directory) in local file header.
* This provides file type and permission
* information necessary to support full
* streaming extraction. Currently being
* discussed with other Zip developers
* ... subject to change.
*
* Format:
* The field starts with a bitmap that specifies
* which additional fields are included. The
* bitmap is variable length and can be extended in
* the future.
*
* n bytes - feature bitmap: first byte has low-order
* 7 bits. If high-order bit is set, a subsequent
* byte holds the next 7 bits, etc.
*
* if bitmap & 1, 2 byte "version made by"
* if bitmap & 2, 2 byte "internal file attributes"
* if bitmap & 4, 4 byte "external file attributes"
* if bitmap & 8, 2 byte comment length + n byte comment
*/
int bitmap, bitmap_last;
if (datasize < 1)
break;
bitmap_last = bitmap = 0xff & p[offset];
offset += 1;
datasize -= 1;
/* We only support first 7 bits of bitmap; skip rest. */
while ((bitmap_last & 0x80) != 0
&& datasize >= 1) {
bitmap_last = p[offset];
offset += 1;
datasize -= 1;
}
if (bitmap & 1) {
/* 2 byte "version made by" */
if (datasize < 2)
break;
zip_entry->system
= archive_le16dec(p + offset) >> 8;
offset += 2;
datasize -= 2;
}
if (bitmap & 2) {
/* 2 byte "internal file attributes" */
uint32_t internal_attributes;
if (datasize < 2)
break;
internal_attributes
= archive_le16dec(p + offset);
/* Not used by libarchive at present. */
(void)internal_attributes; /* UNUSED */
offset += 2;
datasize -= 2;
}
if (bitmap & 4) {
/* 4 byte "external file attributes" */
uint32_t external_attributes;
if (datasize < 4)
break;
external_attributes
= archive_le32dec(p + offset);
if (zip_entry->system == 3) {
zip_entry->mode
= external_attributes >> 16;
} else if (zip_entry->system == 0) {
// Interpret MSDOS directory bit
if (0x10 == (external_attributes & 0x10)) {
zip_entry->mode = AE_IFDIR | 0775;
} else {
zip_entry->mode = AE_IFREG | 0664;
}
if (0x01 == (external_attributes & 0x01)) {
// Read-only bit; strip write permissions
zip_entry->mode &= 0555;
}
} else {
zip_entry->mode = 0;
}
offset += 4;
datasize -= 4;
}
if (bitmap & 8) {
/* 2 byte comment length + comment */
uint32_t comment_length;
if (datasize < 2)
break;
comment_length
= archive_le16dec(p + offset);
offset += 2;
datasize -= 2;
if (datasize < comment_length)
break;
/* Comment is not supported by libarchive */
offset += comment_length;
datasize -= comment_length;
}
break;
}
case 0x7855:
/* Info-ZIP Unix Extra Field (type 2) "Ux". */
#ifdef DEBUG
fprintf(stderr, "uid %d gid %d\n",
archive_le16dec(p + offset),
archive_le16dec(p + offset + 2));
#endif
if (datasize >= 2)
zip_entry->uid = archive_le16dec(p + offset);
if (datasize >= 4)
zip_entry->gid =
archive_le16dec(p + offset + 2);
break;
case 0x7875:
{
/* Info-Zip Unix Extra Field (type 3) "ux". */
int uidsize = 0, gidsize = 0;
/* TODO: support arbitrary uidsize/gidsize. */
if (datasize >= 1 && p[offset] == 1) {/* version=1 */
if (datasize >= 4) {
/* get a uid size. */
uidsize = 0xff & (int)p[offset+1];
if (uidsize == 2)
zip_entry->uid =
archive_le16dec(
p + offset + 2);
else if (uidsize == 4 && datasize >= 6)
zip_entry->uid =
archive_le32dec(
p + offset + 2);
}
if (datasize >= (2 + uidsize + 3)) {
/* get a gid size. */
gidsize = 0xff & (int)p[offset+2+uidsize];
if (gidsize == 2)
zip_entry->gid =
archive_le16dec(
p+offset+2+uidsize+1);
else if (gidsize == 4 &&
datasize >= (2 + uidsize + 5))
zip_entry->gid =
archive_le32dec(
p+offset+2+uidsize+1);
}
}
break;
}
case 0x9901:
/* WinZip AES extra data field. */
if (datasize < 6) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Incomplete AES field");
return ARCHIVE_FAILED;
}
if (p[offset + 2] == 'A' && p[offset + 3] == 'E') {
/* Vendor version. */
zip_entry->aes_extra.vendor =
archive_le16dec(p + offset);
/* AES encryption strength. */
zip_entry->aes_extra.strength = p[offset + 4];
/* Actual compression method. */
zip_entry->aes_extra.compression =
p[offset + 5];
}
break;
default:
break;
}
offset += datasize;
}
if (offset != extra_length) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Malformed extra data: Consumed %d bytes of %d bytes",
(int)offset, (int)extra_length);
return ARCHIVE_FAILED;
}
return ARCHIVE_OK;
}
/*
* Assumes file pointer is at beginning of local file header.
*/
static int
zip_read_local_file_header(struct archive_read *a, struct archive_entry *entry,
struct zip *zip)
{
const char *p;
const void *h;
const wchar_t *wp;
const char *cp;
size_t len, filename_length, extra_length;
struct archive_string_conv *sconv;
struct zip_entry *zip_entry = zip->entry;
struct zip_entry zip_entry_central_dir;
int ret = ARCHIVE_OK;
char version;
/* Save a copy of the original for consistency checks. */
zip_entry_central_dir = *zip_entry;
zip->decompress_init = 0;
zip->end_of_entry = 0;
zip->entry_uncompressed_bytes_read = 0;
zip->entry_compressed_bytes_read = 0;
zip->entry_crc32 = zip->crc32func(0, NULL, 0);
/* Setup default conversion. */
if (zip->sconv == NULL && !zip->init_default_conversion) {
zip->sconv_default =
archive_string_default_conversion_for_read(&(a->archive));
zip->init_default_conversion = 1;
}
if ((p = __archive_read_ahead(a, 30, NULL)) == NULL) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Truncated ZIP file header");
return (ARCHIVE_FATAL);
}
if (memcmp(p, "PK\003\004", 4) != 0) {
archive_set_error(&a->archive, -1, "Damaged Zip archive");
return ARCHIVE_FATAL;
}
version = p[4];
zip_entry->system = p[5];
zip_entry->zip_flags = archive_le16dec(p + 6);
if (zip_entry->zip_flags & (ZIP_ENCRYPTED | ZIP_STRONG_ENCRYPTED)) {
zip->has_encrypted_entries = 1;
archive_entry_set_is_data_encrypted(entry, 1);
if (zip_entry->zip_flags & ZIP_CENTRAL_DIRECTORY_ENCRYPTED &&
zip_entry->zip_flags & ZIP_ENCRYPTED &&
zip_entry->zip_flags & ZIP_STRONG_ENCRYPTED) {
archive_entry_set_is_metadata_encrypted(entry, 1);
return ARCHIVE_FATAL;
}
}
zip->init_decryption = (zip_entry->zip_flags & ZIP_ENCRYPTED);
zip_entry->compression = (char)archive_le16dec(p + 8);
zip_entry->mtime = zip_time(p + 10);
zip_entry->crc32 = archive_le32dec(p + 14);
if (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
zip_entry->decdat = p[11];
else
zip_entry->decdat = p[17];
zip_entry->compressed_size = archive_le32dec(p + 18);
zip_entry->uncompressed_size = archive_le32dec(p + 22);
filename_length = archive_le16dec(p + 26);
extra_length = archive_le16dec(p + 28);
__archive_read_consume(a, 30);
/* Read the filename. */
if ((h = __archive_read_ahead(a, filename_length, NULL)) == NULL) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Truncated ZIP file header");
return (ARCHIVE_FATAL);
}
if (zip_entry->zip_flags & ZIP_UTF8_NAME) {
/* The filename is stored to be UTF-8. */
if (zip->sconv_utf8 == NULL) {
zip->sconv_utf8 =
archive_string_conversion_from_charset(
&a->archive, "UTF-8", 1);
if (zip->sconv_utf8 == NULL)
return (ARCHIVE_FATAL);
}
sconv = zip->sconv_utf8;
} else if (zip->sconv != NULL)
sconv = zip->sconv;
else
sconv = zip->sconv_default;
if (archive_entry_copy_pathname_l(entry,
h, filename_length, sconv) != 0) {
if (errno == ENOMEM) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate memory for Pathname");
return (ARCHIVE_FATAL);
}
archive_set_error(&a->archive,
ARCHIVE_ERRNO_FILE_FORMAT,
"Pathname cannot be converted "
"from %s to current locale.",
archive_string_conversion_charset_name(sconv));
ret = ARCHIVE_WARN;
}
__archive_read_consume(a, filename_length);
/* Read the extra data. */
if ((h = __archive_read_ahead(a, extra_length, NULL)) == NULL) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Truncated ZIP file header");
return (ARCHIVE_FATAL);
}
if (ARCHIVE_OK != process_extra(a, h, extra_length, zip_entry)) {
return ARCHIVE_FATAL;
}
__archive_read_consume(a, extra_length);
/* Work around a bug in Info-Zip: When reading from a pipe, it
* stats the pipe instead of synthesizing a file entry. */
if ((zip_entry->mode & AE_IFMT) == AE_IFIFO) {
zip_entry->mode &= ~ AE_IFMT;
zip_entry->mode |= AE_IFREG;
}
/* If the mode is totally empty, set some sane default. */
if (zip_entry->mode == 0) {
zip_entry->mode |= 0664;
}
/* Windows archivers sometimes use backslash as the directory separator.
Normalize to slash. */
if (zip_entry->system == 0 &&
(wp = archive_entry_pathname_w(entry)) != NULL) {
if (wcschr(wp, L'/') == NULL && wcschr(wp, L'\\') != NULL) {
size_t i;
struct archive_wstring s;
archive_string_init(&s);
archive_wstrcpy(&s, wp);
for (i = 0; i < archive_strlen(&s); i++) {
if (s.s[i] == '\\')
s.s[i] = '/';
}
archive_entry_copy_pathname_w(entry, s.s);
archive_wstring_free(&s);
}
}
/* Make sure that entries with a trailing '/' are marked as directories
* even if the External File Attributes contains bogus values. If this
* is not a directory and there is no type, assume regularfile. */
if ((zip_entry->mode & AE_IFMT) != AE_IFDIR) {
int has_slash;
wp = archive_entry_pathname_w(entry);
if (wp != NULL) {
len = wcslen(wp);
has_slash = len > 0 && wp[len - 1] == L'/';
} else {
cp = archive_entry_pathname(entry);
len = (cp != NULL)?strlen(cp):0;
has_slash = len > 0 && cp[len - 1] == '/';
}
/* Correct file type as needed. */
if (has_slash) {
zip_entry->mode &= ~AE_IFMT;
zip_entry->mode |= AE_IFDIR;
zip_entry->mode |= 0111;
} else if ((zip_entry->mode & AE_IFMT) == 0) {
zip_entry->mode |= AE_IFREG;
}
}
/* Make sure directories end in '/' */
if ((zip_entry->mode & AE_IFMT) == AE_IFDIR) {
wp = archive_entry_pathname_w(entry);
if (wp != NULL) {
len = wcslen(wp);
if (len > 0 && wp[len - 1] != L'/') {
struct archive_wstring s;
archive_string_init(&s);
archive_wstrcat(&s, wp);
archive_wstrappend_wchar(&s, L'/');
archive_entry_copy_pathname_w(entry, s.s);
archive_wstring_free(&s);
}
} else {
cp = archive_entry_pathname(entry);
len = (cp != NULL)?strlen(cp):0;
if (len > 0 && cp[len - 1] != '/') {
struct archive_string s;
archive_string_init(&s);
archive_strcat(&s, cp);
archive_strappend_char(&s, '/');
archive_entry_set_pathname(entry, s.s);
archive_string_free(&s);
}
}
}
if (zip_entry->flags & LA_FROM_CENTRAL_DIRECTORY) {
/* If this came from the central dir, it's size info
* is definitive, so ignore the length-at-end flag. */
zip_entry->zip_flags &= ~ZIP_LENGTH_AT_END;
/* If local header is missing a value, use the one from
the central directory. If both have it, warn about
mismatches. */
if (zip_entry->crc32 == 0) {
zip_entry->crc32 = zip_entry_central_dir.crc32;
} else if (!zip->ignore_crc32
&& zip_entry->crc32 != zip_entry_central_dir.crc32) {
archive_set_error(&a->archive,
ARCHIVE_ERRNO_FILE_FORMAT,
"Inconsistent CRC32 values");
ret = ARCHIVE_WARN;
}
if (zip_entry->compressed_size == 0) {
zip_entry->compressed_size
= zip_entry_central_dir.compressed_size;
} else if (zip_entry->compressed_size
!= zip_entry_central_dir.compressed_size) {
archive_set_error(&a->archive,
ARCHIVE_ERRNO_FILE_FORMAT,
"Inconsistent compressed size: "
"%jd in central directory, %jd in local header",
(intmax_t)zip_entry_central_dir.compressed_size,
(intmax_t)zip_entry->compressed_size);
ret = ARCHIVE_WARN;
}
if (zip_entry->uncompressed_size == 0) {
zip_entry->uncompressed_size
= zip_entry_central_dir.uncompressed_size;
} else if (zip_entry->uncompressed_size
!= zip_entry_central_dir.uncompressed_size) {
archive_set_error(&a->archive,
ARCHIVE_ERRNO_FILE_FORMAT,
"Inconsistent uncompressed size: "
"%jd in central directory, %jd in local header",
(intmax_t)zip_entry_central_dir.uncompressed_size,
(intmax_t)zip_entry->uncompressed_size);
ret = ARCHIVE_WARN;
}
}
/* Populate some additional entry fields: */
archive_entry_set_mode(entry, zip_entry->mode);
archive_entry_set_uid(entry, zip_entry->uid);
archive_entry_set_gid(entry, zip_entry->gid);
archive_entry_set_mtime(entry, zip_entry->mtime, 0);
archive_entry_set_ctime(entry, zip_entry->ctime, 0);
archive_entry_set_atime(entry, zip_entry->atime, 0);
if ((zip->entry->mode & AE_IFMT) == AE_IFLNK) {
size_t linkname_length;
if (zip_entry->compressed_size > 64 * 1024) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Zip file with oversized link entry");
return ARCHIVE_FATAL;
}
linkname_length = (size_t)zip_entry->compressed_size;
archive_entry_set_size(entry, 0);
p = __archive_read_ahead(a, linkname_length, NULL);
if (p == NULL) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Truncated Zip file");
return ARCHIVE_FATAL;
}
sconv = zip->sconv;
if (sconv == NULL && (zip->entry->zip_flags & ZIP_UTF8_NAME))
sconv = zip->sconv_utf8;
if (sconv == NULL)
sconv = zip->sconv_default;
if (archive_entry_copy_symlink_l(entry, p, linkname_length,
sconv) != 0) {
if (errno != ENOMEM && sconv == zip->sconv_utf8 &&
(zip->entry->zip_flags & ZIP_UTF8_NAME))
archive_entry_copy_symlink_l(entry, p,
linkname_length, NULL);
if (errno == ENOMEM) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate memory for Symlink");
return (ARCHIVE_FATAL);
}
/*
* Since there is no character-set regulation for
* symlink name, do not report the conversion error
* in an automatic conversion.
*/
if (sconv != zip->sconv_utf8 ||
(zip->entry->zip_flags & ZIP_UTF8_NAME) == 0) {
archive_set_error(&a->archive,
ARCHIVE_ERRNO_FILE_FORMAT,
"Symlink cannot be converted "
"from %s to current locale.",
archive_string_conversion_charset_name(
sconv));
ret = ARCHIVE_WARN;
}
}
zip_entry->uncompressed_size = zip_entry->compressed_size = 0;
if (__archive_read_consume(a, linkname_length) < 0) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Read error skipping symlink target name");
return ARCHIVE_FATAL;
}
} else if (0 == (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
|| zip_entry->uncompressed_size > 0) {
/* Set the size only if it's meaningful. */
archive_entry_set_size(entry, zip_entry->uncompressed_size);
}
zip->entry_bytes_remaining = zip_entry->compressed_size;
/* If there's no body, force read_data() to return EOF immediately. */
if (0 == (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
&& zip->entry_bytes_remaining < 1)
zip->end_of_entry = 1;
/* Set up a more descriptive format name. */
archive_string_empty(&zip->format_name);
archive_string_sprintf(&zip->format_name, "ZIP %d.%d (%s)",
version / 10, version % 10,
compression_name(zip->entry->compression));
a->archive.archive_format_name = zip->format_name.s;
return (ret);
}
static int
check_authentication_code(struct archive_read *a, const void *_p)
{
struct zip *zip = (struct zip *)(a->format->data);
/* Check authentication code. */
if (zip->hctx_valid) {
const void *p;
uint8_t hmac[20];
size_t hmac_len = 20;
int cmp;
archive_hmac_sha1_final(&zip->hctx, hmac, &hmac_len);
if (_p == NULL) {
/* Read authentication code. */
p = __archive_read_ahead(a, AUTH_CODE_SIZE, NULL);
if (p == NULL) {
archive_set_error(&a->archive,
ARCHIVE_ERRNO_FILE_FORMAT,
"Truncated ZIP file data");
return (ARCHIVE_FATAL);
}
} else {
p = _p;
}
cmp = memcmp(hmac, p, AUTH_CODE_SIZE);
__archive_read_consume(a, AUTH_CODE_SIZE);
if (cmp != 0) {
archive_set_error(&a->archive,
ARCHIVE_ERRNO_MISC,
"ZIP bad Authentication code");
return (ARCHIVE_WARN);
}
}
return (ARCHIVE_OK);
}
/*
* Read "uncompressed" data. There are three cases:
* 1) We know the size of the data. This is always true for the
* seeking reader (we've examined the Central Directory already).
* 2) ZIP_LENGTH_AT_END was set, but only the CRC was deferred.
* Info-ZIP seems to do this; we know the size but have to grab
* the CRC from the data descriptor afterwards.
* 3) We're streaming and ZIP_LENGTH_AT_END was specified and
* we have no size information. In this case, we can do pretty
* well by watching for the data descriptor record. The data
* descriptor is 16 bytes and includes a computed CRC that should
* provide a strong check.
*
* TODO: Technically, the PK\007\010 signature is optional.
* In the original spec, the data descriptor contained CRC
* and size fields but had no leading signature. In practice,
* newer writers seem to provide the signature pretty consistently.
*
* For uncompressed data, the PK\007\010 marker seems essential
* to be sure we've actually seen the end of the entry.
*
* Returns ARCHIVE_OK if successful, ARCHIVE_FATAL otherwise, sets
* zip->end_of_entry if it consumes all of the data.
*/
static int
zip_read_data_none(struct archive_read *a, const void **_buff,
size_t *size, int64_t *offset)
{
struct zip *zip;
const char *buff;
ssize_t bytes_avail;
int r;
(void)offset; /* UNUSED */
zip = (struct zip *)(a->format->data);
if (zip->entry->zip_flags & ZIP_LENGTH_AT_END) {
const char *p;
ssize_t grabbing_bytes = 24;
if (zip->hctx_valid)
grabbing_bytes += AUTH_CODE_SIZE;
/* Grab at least 24 bytes. */
buff = __archive_read_ahead(a, grabbing_bytes, &bytes_avail);
if (bytes_avail < grabbing_bytes) {
/* Zip archives have end-of-archive markers
that are longer than this, so a failure to get at
least 24 bytes really does indicate a truncated
file. */
archive_set_error(&a->archive,
ARCHIVE_ERRNO_FILE_FORMAT,
"Truncated ZIP file data");
return (ARCHIVE_FATAL);
}
/* Check for a complete PK\007\010 signature, followed
* by the correct 4-byte CRC. */
p = buff;
if (zip->hctx_valid)
p += AUTH_CODE_SIZE;
if (p[0] == 'P' && p[1] == 'K'
&& p[2] == '\007' && p[3] == '\010'
&& (archive_le32dec(p + 4) == zip->entry_crc32
|| zip->ignore_crc32
|| (zip->hctx_valid
&& zip->entry->aes_extra.vendor == AES_VENDOR_AE_2))) {
if (zip->entry->flags & LA_USED_ZIP64) {
uint64_t compressed, uncompressed;
zip->entry->crc32 = archive_le32dec(p + 4);
compressed = archive_le64dec(p + 8);
uncompressed = archive_le64dec(p + 16);
if (compressed > INT64_MAX || uncompressed > INT64_MAX) {
archive_set_error(&a->archive,
ARCHIVE_ERRNO_FILE_FORMAT,
"Overflow of 64-bit file sizes");
return ARCHIVE_FAILED;
}
zip->entry->compressed_size = compressed;
zip->entry->uncompressed_size = uncompressed;
zip->unconsumed = 24;
} else {
zip->entry->crc32 = archive_le32dec(p + 4);
zip->entry->compressed_size =
archive_le32dec(p + 8);
zip->entry->uncompressed_size =
archive_le32dec(p + 12);
zip->unconsumed = 16;
}
if (zip->hctx_valid) {
r = check_authentication_code(a, buff);
if (r != ARCHIVE_OK)
return (r);
}
zip->end_of_entry = 1;
return (ARCHIVE_OK);
}
/* If not at EOF, ensure we consume at least one byte. */
++p;
/* Scan forward until we see where a PK\007\010 signature
* might be. */
/* Return bytes up until that point. On the next call,
* the code above will verify the data descriptor. */
while (p < buff + bytes_avail - 4) {
if (p[3] == 'P') { p += 3; }
else if (p[3] == 'K') { p += 2; }
else if (p[3] == '\007') { p += 1; }
else if (p[3] == '\010' && p[2] == '\007'
&& p[1] == 'K' && p[0] == 'P') {
if (zip->hctx_valid)
p -= AUTH_CODE_SIZE;
break;
} else { p += 4; }
}
bytes_avail = p - buff;
} else {
if (zip->entry_bytes_remaining == 0) {
zip->end_of_entry = 1;
if (zip->hctx_valid) {
r = check_authentication_code(a, NULL);
if (r != ARCHIVE_OK)
return (r);
}
return (ARCHIVE_OK);
}
/* Grab a bunch of bytes. */
buff = __archive_read_ahead(a, 1, &bytes_avail);
if (bytes_avail <= 0) {
archive_set_error(&a->archive,
ARCHIVE_ERRNO_FILE_FORMAT,
"Truncated ZIP file data");
return (ARCHIVE_FATAL);
}
if (bytes_avail > zip->entry_bytes_remaining)
bytes_avail = (ssize_t)zip->entry_bytes_remaining;
}
if (zip->tctx_valid || zip->cctx_valid) {
size_t dec_size = bytes_avail;
if (dec_size > zip->decrypted_buffer_size)
dec_size = zip->decrypted_buffer_size;
if (zip->tctx_valid) {
trad_enc_decrypt_update(&zip->tctx,
(const uint8_t *)buff, dec_size,
zip->decrypted_buffer, dec_size);
} else {
size_t dsize = dec_size;
archive_hmac_sha1_update(&zip->hctx,
(const uint8_t *)buff, dec_size);
archive_decrypto_aes_ctr_update(&zip->cctx,
(const uint8_t *)buff, dec_size,
zip->decrypted_buffer, &dsize);
}
bytes_avail = dec_size;
buff = (const char *)zip->decrypted_buffer;
}
*size = bytes_avail;
zip->entry_bytes_remaining -= bytes_avail;
zip->entry_uncompressed_bytes_read += bytes_avail;
zip->entry_compressed_bytes_read += bytes_avail;
zip->unconsumed += bytes_avail;
*_buff = buff;
return (ARCHIVE_OK);
}
#ifdef HAVE_ZLIB_H
static int
zip_deflate_init(struct archive_read *a, struct zip *zip)
{
int r;
/* If we haven't yet read any data, initialize the decompressor. */
if (!zip->decompress_init) {
if (zip->stream_valid)
r = inflateReset(&zip->stream);
else
r = inflateInit2(&zip->stream,
-15 /* Don't check for zlib header */);
if (r != Z_OK) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Can't initialize ZIP decompression.");
return (ARCHIVE_FATAL);
}
/* Stream structure has been set up. */
zip->stream_valid = 1;
/* We've initialized decompression for this stream. */
zip->decompress_init = 1;
}
return (ARCHIVE_OK);
}
static int
zip_read_data_deflate(struct archive_read *a, const void **buff,
size_t *size, int64_t *offset)
{
struct zip *zip;
ssize_t bytes_avail;
const void *compressed_buff, *sp;
int r;
(void)offset; /* UNUSED */
zip = (struct zip *)(a->format->data);
/* If the buffer hasn't been allocated, allocate it now. */
if (zip->uncompressed_buffer == NULL) {
zip->uncompressed_buffer_size = 256 * 1024;
zip->uncompressed_buffer
= (unsigned char *)malloc(zip->uncompressed_buffer_size);
if (zip->uncompressed_buffer == NULL) {
archive_set_error(&a->archive, ENOMEM,
"No memory for ZIP decompression");
return (ARCHIVE_FATAL);
}
}
r = zip_deflate_init(a, zip);
if (r != ARCHIVE_OK)
return (r);
/*
* Note: '1' here is a performance optimization.
* Recall that the decompression layer returns a count of
* available bytes; asking for more than that forces the
* decompressor to combine reads by copying data.
*/
compressed_buff = sp = __archive_read_ahead(a, 1, &bytes_avail);
if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
&& bytes_avail > zip->entry_bytes_remaining) {
bytes_avail = (ssize_t)zip->entry_bytes_remaining;
}
if (bytes_avail < 0) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Truncated ZIP file body");
return (ARCHIVE_FATAL);
}
if (zip->tctx_valid || zip->cctx_valid) {
if (zip->decrypted_bytes_remaining < (size_t)bytes_avail) {
size_t buff_remaining =
(zip->decrypted_buffer + zip->decrypted_buffer_size)
- (zip->decrypted_ptr + zip->decrypted_bytes_remaining);
if (buff_remaining > (size_t)bytes_avail)
buff_remaining = (size_t)bytes_avail;
if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) &&
zip->entry_bytes_remaining > 0) {
if ((int64_t)(zip->decrypted_bytes_remaining
+ buff_remaining)
> zip->entry_bytes_remaining) {
if (zip->entry_bytes_remaining <
(int64_t)zip->decrypted_bytes_remaining)
buff_remaining = 0;
else
buff_remaining =
(size_t)zip->entry_bytes_remaining
- zip->decrypted_bytes_remaining;
}
}
if (buff_remaining > 0) {
if (zip->tctx_valid) {
trad_enc_decrypt_update(&zip->tctx,
compressed_buff, buff_remaining,
zip->decrypted_ptr
+ zip->decrypted_bytes_remaining,
buff_remaining);
} else {
size_t dsize = buff_remaining;
archive_decrypto_aes_ctr_update(
&zip->cctx,
compressed_buff, buff_remaining,
zip->decrypted_ptr
+ zip->decrypted_bytes_remaining,
&dsize);
}
zip->decrypted_bytes_remaining += buff_remaining;
}
}
bytes_avail = zip->decrypted_bytes_remaining;
compressed_buff = (const char *)zip->decrypted_ptr;
}
/*
* A bug in zlib.h: stream.next_in should be marked 'const'
* but isn't (the library never alters data through the
* next_in pointer, only reads it). The result: this ugly
* cast to remove 'const'.
*/
zip->stream.next_in = (Bytef *)(uintptr_t)(const void *)compressed_buff;
zip->stream.avail_in = (uInt)bytes_avail;
zip->stream.total_in = 0;
zip->stream.next_out = zip->uncompressed_buffer;
zip->stream.avail_out = (uInt)zip->uncompressed_buffer_size;
zip->stream.total_out = 0;
r = inflate(&zip->stream, 0);
switch (r) {
case Z_OK:
break;
case Z_STREAM_END:
zip->end_of_entry = 1;
break;
case Z_MEM_ERROR:
archive_set_error(&a->archive, ENOMEM,
"Out of memory for ZIP decompression");
return (ARCHIVE_FATAL);
default:
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"ZIP decompression failed (%d)", r);
return (ARCHIVE_FATAL);
}
/* Consume as much as the compressor actually used. */
bytes_avail = zip->stream.total_in;
if (zip->tctx_valid || zip->cctx_valid) {
zip->decrypted_bytes_remaining -= bytes_avail;
if (zip->decrypted_bytes_remaining == 0)
zip->decrypted_ptr = zip->decrypted_buffer;
else
zip->decrypted_ptr += bytes_avail;
}
/* Calculate compressed data as much as we used.*/
if (zip->hctx_valid)
archive_hmac_sha1_update(&zip->hctx, sp, bytes_avail);
__archive_read_consume(a, bytes_avail);
zip->entry_bytes_remaining -= bytes_avail;
zip->entry_compressed_bytes_read += bytes_avail;
*size = zip->stream.total_out;
zip->entry_uncompressed_bytes_read += zip->stream.total_out;
*buff = zip->uncompressed_buffer;
if (zip->end_of_entry && zip->hctx_valid) {
r = check_authentication_code(a, NULL);
if (r != ARCHIVE_OK)
return (r);
}
if (zip->end_of_entry && (zip->entry->zip_flags & ZIP_LENGTH_AT_END)) {
const char *p;
if (NULL == (p = __archive_read_ahead(a, 24, NULL))) {
archive_set_error(&a->archive,
ARCHIVE_ERRNO_FILE_FORMAT,
"Truncated ZIP end-of-file record");
return (ARCHIVE_FATAL);
}
/* Consume the optional PK\007\010 marker. */
if (p[0] == 'P' && p[1] == 'K' &&
p[2] == '\007' && p[3] == '\010') {
p += 4;
zip->unconsumed = 4;
}
if (zip->entry->flags & LA_USED_ZIP64) {
uint64_t compressed, uncompressed;
zip->entry->crc32 = archive_le32dec(p);
compressed = archive_le64dec(p + 4);
uncompressed = archive_le64dec(p + 12);
if (compressed > INT64_MAX || uncompressed > INT64_MAX) {
archive_set_error(&a->archive,
ARCHIVE_ERRNO_FILE_FORMAT,
"Overflow of 64-bit file sizes");
return ARCHIVE_FAILED;
}
zip->entry->compressed_size = compressed;
zip->entry->uncompressed_size = uncompressed;
zip->unconsumed += 20;
} else {
zip->entry->crc32 = archive_le32dec(p);
zip->entry->compressed_size = archive_le32dec(p + 4);
zip->entry->uncompressed_size = archive_le32dec(p + 8);
zip->unconsumed += 12;
}
}
return (ARCHIVE_OK);
}
#endif
static int
read_decryption_header(struct archive_read *a)
{
struct zip *zip = (struct zip *)(a->format->data);
const char *p;
unsigned int remaining_size;
unsigned int ts;
/*
* Read an initialization vector data field.
*/
p = __archive_read_ahead(a, 2, NULL);
if (p == NULL)
goto truncated;
ts = zip->iv_size;
zip->iv_size = archive_le16dec(p);
__archive_read_consume(a, 2);
if (ts < zip->iv_size) {
free(zip->iv);
zip->iv = NULL;
}
p = __archive_read_ahead(a, zip->iv_size, NULL);
if (p == NULL)
goto truncated;
if (zip->iv == NULL) {
zip->iv = malloc(zip->iv_size);
if (zip->iv == NULL)
goto nomem;
}
memcpy(zip->iv, p, zip->iv_size);
__archive_read_consume(a, zip->iv_size);
/*
* Read a size of remaining decryption header field.
*/
p = __archive_read_ahead(a, 14, NULL);
if (p == NULL)
goto truncated;
remaining_size = archive_le32dec(p);
if (remaining_size < 16 || remaining_size > (1 << 18))
goto corrupted;
/* Check if format version is supported. */
if (archive_le16dec(p+4) != 3) {
archive_set_error(&a->archive,
ARCHIVE_ERRNO_FILE_FORMAT,
"Unsupported encryption format version: %u",
archive_le16dec(p+4));
return (ARCHIVE_FAILED);
}
/*
* Read an encryption algorithm field.
*/
zip->alg_id = archive_le16dec(p+6);
switch (zip->alg_id) {
case 0x6601:/* DES */
case 0x6602:/* RC2 */
case 0x6603:/* 3DES 168 */
case 0x6609:/* 3DES 112 */
case 0x660E:/* AES 128 */
case 0x660F:/* AES 192 */
case 0x6610:/* AES 256 */
case 0x6702:/* RC2 (version >= 5.2) */
case 0x6720:/* Blowfish */
case 0x6721:/* Twofish */
case 0x6801:/* RC4 */
/* Supported encryption algorithm. */
break;
default:
archive_set_error(&a->archive,
ARCHIVE_ERRNO_FILE_FORMAT,
"Unknown encryption algorithm: %u", zip->alg_id);
return (ARCHIVE_FAILED);
}
/*
* Read a bit length field.
*/
zip->bit_len = archive_le16dec(p+8);
/*
* Read a flags field.
*/
zip->flags = archive_le16dec(p+10);
switch (zip->flags & 0xf000) {
case 0x0001: /* Password is required to decrypt. */
case 0x0002: /* Certificates only. */
case 0x0003: /* Password or certificate required to decrypt. */
break;
default:
archive_set_error(&a->archive,
ARCHIVE_ERRNO_FILE_FORMAT,
"Unknown encryption flag: %u", zip->flags);
return (ARCHIVE_FAILED);
}
if ((zip->flags & 0xf000) == 0 ||
(zip->flags & 0xf000) == 0x4000) {
archive_set_error(&a->archive,
ARCHIVE_ERRNO_FILE_FORMAT,
"Unknown encryption flag: %u", zip->flags);
return (ARCHIVE_FAILED);
}
/*
* Read an encrypted random data field.
*/
ts = zip->erd_size;
zip->erd_size = archive_le16dec(p+12);
__archive_read_consume(a, 14);
if ((zip->erd_size & 0xf) != 0 ||
(zip->erd_size + 16) > remaining_size ||
(zip->erd_size + 16) < zip->erd_size)
goto corrupted;
if (ts < zip->erd_size) {
free(zip->erd);
zip->erd = NULL;
}
p = __archive_read_ahead(a, zip->erd_size, NULL);
if (p == NULL)
goto truncated;
if (zip->erd == NULL) {
zip->erd = malloc(zip->erd_size);
if (zip->erd == NULL)
goto nomem;
}
memcpy(zip->erd, p, zip->erd_size);
__archive_read_consume(a, zip->erd_size);
/*
* Read a reserved data field.
*/
p = __archive_read_ahead(a, 4, NULL);
if (p == NULL)
goto truncated;
/* Reserved data size should be zero. */
if (archive_le32dec(p) != 0)
goto corrupted;
__archive_read_consume(a, 4);
/*
* Read a password validation data field.
*/
p = __archive_read_ahead(a, 2, NULL);
if (p == NULL)
goto truncated;
ts = zip->v_size;
zip->v_size = archive_le16dec(p);
__archive_read_consume(a, 2);
if ((zip->v_size & 0x0f) != 0 ||
(zip->erd_size + zip->v_size + 16) > remaining_size ||
(zip->erd_size + zip->v_size + 16) < (zip->erd_size + zip->v_size))
goto corrupted;
if (ts < zip->v_size) {
free(zip->v_data);
zip->v_data = NULL;
}
p = __archive_read_ahead(a, zip->v_size, NULL);
if (p == NULL)
goto truncated;
if (zip->v_data == NULL) {
zip->v_data = malloc(zip->v_size);
if (zip->v_data == NULL)
goto nomem;
}
memcpy(zip->v_data, p, zip->v_size);
__archive_read_consume(a, zip->v_size);
p = __archive_read_ahead(a, 4, NULL);
if (p == NULL)
goto truncated;
zip->v_crc32 = archive_le32dec(p);
__archive_read_consume(a, 4);
/*return (ARCHIVE_OK);
* This is not fully implemented yet.*/
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Encrypted file is unsupported");
return (ARCHIVE_FAILED);
truncated:
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Truncated ZIP file data");
return (ARCHIVE_FATAL);
corrupted:
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Corrupted ZIP file data");
return (ARCHIVE_FATAL);
nomem:
archive_set_error(&a->archive, ENOMEM,
"No memory for ZIP decryption");
return (ARCHIVE_FATAL);
}
static int
zip_alloc_decryption_buffer(struct archive_read *a)
{
struct zip *zip = (struct zip *)(a->format->data);
size_t bs = 256 * 1024;
if (zip->decrypted_buffer == NULL) {
zip->decrypted_buffer_size = bs;
zip->decrypted_buffer = malloc(bs);
if (zip->decrypted_buffer == NULL) {
archive_set_error(&a->archive, ENOMEM,
"No memory for ZIP decryption");
return (ARCHIVE_FATAL);
}
}
zip->decrypted_ptr = zip->decrypted_buffer;
return (ARCHIVE_OK);
}
static int
init_traditional_PKWARE_decryption(struct archive_read *a)
{
struct zip *zip = (struct zip *)(a->format->data);
const void *p;
int retry;
int r;
if (zip->tctx_valid)
return (ARCHIVE_OK);
/*
Read the 12 bytes encryption header stored at
the start of the data area.
*/
#define ENC_HEADER_SIZE 12
if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
&& zip->entry_bytes_remaining < ENC_HEADER_SIZE) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Truncated Zip encrypted body: only %jd bytes available",
(intmax_t)zip->entry_bytes_remaining);
return (ARCHIVE_FATAL);
}
p = __archive_read_ahead(a, ENC_HEADER_SIZE, NULL);
if (p == NULL) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Truncated ZIP file data");
return (ARCHIVE_FATAL);
}
for (retry = 0;; retry++) {
const char *passphrase;
uint8_t crcchk;
passphrase = __archive_read_next_passphrase(a);
if (passphrase == NULL) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
(retry > 0)?
"Incorrect passphrase":
"Passphrase required for this entry");
return (ARCHIVE_FAILED);
}
/*
* Initialize ctx for Traditional PKWARE Decryption.
*/
r = trad_enc_init(&zip->tctx, passphrase, strlen(passphrase),
p, ENC_HEADER_SIZE, &crcchk);
if (r == 0 && crcchk == zip->entry->decdat)
break;/* The passphrase is OK. */
if (retry > 10000) {
/* Avoid infinity loop. */
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Too many incorrect passphrases");
return (ARCHIVE_FAILED);
}
}
__archive_read_consume(a, ENC_HEADER_SIZE);
zip->tctx_valid = 1;
if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)) {
zip->entry_bytes_remaining -= ENC_HEADER_SIZE;
}
/*zip->entry_uncompressed_bytes_read += ENC_HEADER_SIZE;*/
zip->entry_compressed_bytes_read += ENC_HEADER_SIZE;
zip->decrypted_bytes_remaining = 0;
return (zip_alloc_decryption_buffer(a));
#undef ENC_HEADER_SIZE
}
static int
init_WinZip_AES_decryption(struct archive_read *a)
{
struct zip *zip = (struct zip *)(a->format->data);
const void *p;
const uint8_t *pv;
size_t key_len, salt_len;
uint8_t derived_key[MAX_DERIVED_KEY_BUF_SIZE];
int retry;
int r;
if (zip->cctx_valid || zip->hctx_valid)
return (ARCHIVE_OK);
switch (zip->entry->aes_extra.strength) {
case 1: salt_len = 8; key_len = 16; break;
case 2: salt_len = 12; key_len = 24; break;
case 3: salt_len = 16; key_len = 32; break;
default: goto corrupted;
}
p = __archive_read_ahead(a, salt_len + 2, NULL);
if (p == NULL)
goto truncated;
for (retry = 0;; retry++) {
const char *passphrase;
passphrase = __archive_read_next_passphrase(a);
if (passphrase == NULL) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
(retry > 0)?
"Incorrect passphrase":
"Passphrase required for this entry");
return (ARCHIVE_FAILED);
}
memset(derived_key, 0, sizeof(derived_key));
r = archive_pbkdf2_sha1(passphrase, strlen(passphrase),
p, salt_len, 1000, derived_key, key_len * 2 + 2);
if (r != 0) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Decryption is unsupported due to lack of "
"crypto library");
return (ARCHIVE_FAILED);
}
/* Check password verification value. */
pv = ((const uint8_t *)p) + salt_len;
if (derived_key[key_len * 2] == pv[0] &&
derived_key[key_len * 2 + 1] == pv[1])
break;/* The passphrase is OK. */
if (retry > 10000) {
/* Avoid infinity loop. */
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Too many incorrect passphrases");
return (ARCHIVE_FAILED);
}
}
r = archive_decrypto_aes_ctr_init(&zip->cctx, derived_key, key_len);
if (r != 0) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Decryption is unsupported due to lack of crypto library");
return (ARCHIVE_FAILED);
}
r = archive_hmac_sha1_init(&zip->hctx, derived_key + key_len, key_len);
if (r != 0) {
archive_decrypto_aes_ctr_release(&zip->cctx);
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Failed to initialize HMAC-SHA1");
return (ARCHIVE_FAILED);
}
zip->cctx_valid = zip->hctx_valid = 1;
__archive_read_consume(a, salt_len + 2);
zip->entry_bytes_remaining -= salt_len + 2 + AUTH_CODE_SIZE;
if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
&& zip->entry_bytes_remaining < 0)
goto corrupted;
zip->entry_compressed_bytes_read += salt_len + 2 + AUTH_CODE_SIZE;
zip->decrypted_bytes_remaining = 0;
zip->entry->compression = zip->entry->aes_extra.compression;
return (zip_alloc_decryption_buffer(a));
truncated:
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Truncated ZIP file data");
return (ARCHIVE_FATAL);
corrupted:
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Corrupted ZIP file data");
return (ARCHIVE_FATAL);
}
static int
archive_read_format_zip_read_data(struct archive_read *a,
const void **buff, size_t *size, int64_t *offset)
{
int r;
struct zip *zip = (struct zip *)(a->format->data);
if (zip->has_encrypted_entries ==
ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) {
zip->has_encrypted_entries = 0;
}
*offset = zip->entry_uncompressed_bytes_read;
*size = 0;
*buff = NULL;
/* If we hit end-of-entry last time, return ARCHIVE_EOF. */
if (zip->end_of_entry)
return (ARCHIVE_EOF);
/* Return EOF immediately if this is a non-regular file. */
if (AE_IFREG != (zip->entry->mode & AE_IFMT))
return (ARCHIVE_EOF);
__archive_read_consume(a, zip->unconsumed);
zip->unconsumed = 0;
if (zip->init_decryption) {
zip->has_encrypted_entries = 1;
if (zip->entry->zip_flags & ZIP_STRONG_ENCRYPTED)
r = read_decryption_header(a);
else if (zip->entry->compression == WINZIP_AES_ENCRYPTION)
r = init_WinZip_AES_decryption(a);
else
r = init_traditional_PKWARE_decryption(a);
if (r != ARCHIVE_OK)
return (r);
zip->init_decryption = 0;
}
switch(zip->entry->compression) {
case 0: /* No compression. */
r = zip_read_data_none(a, buff, size, offset);
break;
#ifdef HAVE_ZLIB_H
case 8: /* Deflate compression. */
r = zip_read_data_deflate(a, buff, size, offset);
break;
#endif
default: /* Unsupported compression. */
/* Return a warning. */
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Unsupported ZIP compression method (%s)",
compression_name(zip->entry->compression));
/* We can't decompress this entry, but we will
* be able to skip() it and try the next entry. */
return (ARCHIVE_FAILED);
break;
}
if (r != ARCHIVE_OK)
return (r);
/* Update checksum */
if (*size)
zip->entry_crc32 = zip->crc32func(zip->entry_crc32, *buff,
(unsigned)*size);
/* If we hit the end, swallow any end-of-data marker. */
if (zip->end_of_entry) {
/* Check file size, CRC against these values. */
if (zip->entry->compressed_size !=
zip->entry_compressed_bytes_read) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"ZIP compressed data is wrong size "
"(read %jd, expected %jd)",
(intmax_t)zip->entry_compressed_bytes_read,
(intmax_t)zip->entry->compressed_size);
return (ARCHIVE_WARN);
}
/* Size field only stores the lower 32 bits of the actual
* size. */
if ((zip->entry->uncompressed_size & UINT32_MAX)
!= (zip->entry_uncompressed_bytes_read & UINT32_MAX)) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"ZIP uncompressed data is wrong size "
"(read %jd, expected %jd)\n",
(intmax_t)zip->entry_uncompressed_bytes_read,
(intmax_t)zip->entry->uncompressed_size);
return (ARCHIVE_WARN);
}
/* Check computed CRC against header */
if ((!zip->hctx_valid ||
zip->entry->aes_extra.vendor != AES_VENDOR_AE_2) &&
zip->entry->crc32 != zip->entry_crc32
&& !zip->ignore_crc32) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"ZIP bad CRC: 0x%lx should be 0x%lx",
(unsigned long)zip->entry_crc32,
(unsigned long)zip->entry->crc32);
return (ARCHIVE_WARN);
}
}
return (ARCHIVE_OK);
}
static int
archive_read_format_zip_cleanup(struct archive_read *a)
{
struct zip *zip;
struct zip_entry *zip_entry, *next_zip_entry;
zip = (struct zip *)(a->format->data);
#ifdef HAVE_ZLIB_H
if (zip->stream_valid)
inflateEnd(&zip->stream);
free(zip->uncompressed_buffer);
#endif
if (zip->zip_entries) {
zip_entry = zip->zip_entries;
while (zip_entry != NULL) {
next_zip_entry = zip_entry->next;
archive_string_free(&zip_entry->rsrcname);
free(zip_entry);
zip_entry = next_zip_entry;
}
}
free(zip->decrypted_buffer);
if (zip->cctx_valid)
archive_decrypto_aes_ctr_release(&zip->cctx);
if (zip->hctx_valid)
archive_hmac_sha1_cleanup(&zip->hctx);
free(zip->iv);
free(zip->erd);
free(zip->v_data);
archive_string_free(&zip->format_name);
free(zip);
(a->format->data) = NULL;
return (ARCHIVE_OK);
}
static int
archive_read_format_zip_has_encrypted_entries(struct archive_read *_a)
{
if (_a && _a->format) {
struct zip * zip = (struct zip *)_a->format->data;
if (zip) {
return zip->has_encrypted_entries;
}
}
return ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW;
}
static int
archive_read_format_zip_options(struct archive_read *a,
const char *key, const char *val)
{
struct zip *zip;
int ret = ARCHIVE_FAILED;
zip = (struct zip *)(a->format->data);
if (strcmp(key, "compat-2x") == 0) {
/* Handle filenames as libarchive 2.x */
zip->init_default_conversion = (val != NULL) ? 1 : 0;
return (ARCHIVE_OK);
} else if (strcmp(key, "hdrcharset") == 0) {
if (val == NULL || val[0] == 0)
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"zip: hdrcharset option needs a character-set name"
);
else {
zip->sconv = archive_string_conversion_from_charset(
&a->archive, val, 0);
if (zip->sconv != NULL) {
if (strcmp(val, "UTF-8") == 0)
zip->sconv_utf8 = zip->sconv;
ret = ARCHIVE_OK;
} else
ret = ARCHIVE_FATAL;
}
return (ret);
} else if (strcmp(key, "ignorecrc32") == 0) {
/* Mostly useful for testing. */
if (val == NULL || val[0] == 0) {
zip->crc32func = real_crc32;
zip->ignore_crc32 = 0;
} else {
zip->crc32func = fake_crc32;
zip->ignore_crc32 = 1;
}
return (ARCHIVE_OK);
} else if (strcmp(key, "mac-ext") == 0) {
zip->process_mac_extensions = (val != NULL && val[0] != 0);
return (ARCHIVE_OK);
}
/* Note: The "warn" return is just to inform the options
* supervisor that we didn't handle it. It will generate
* a suitable error if no one used this option. */
return (ARCHIVE_WARN);
}
int
archive_read_support_format_zip(struct archive *a)
{
int r;
r = archive_read_support_format_zip_streamable(a);
if (r != ARCHIVE_OK)
return r;
return (archive_read_support_format_zip_seekable(a));
}
/* ------------------------------------------------------------------------ */
/*
* Streaming-mode support
*/
static int
archive_read_support_format_zip_capabilities_streamable(struct archive_read * a)
{
(void)a; /* UNUSED */
return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA |
ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA);
}
static int
archive_read_format_zip_streamable_bid(struct archive_read *a, int best_bid)
{
const char *p;
(void)best_bid; /* UNUSED */
if ((p = __archive_read_ahead(a, 4, NULL)) == NULL)
return (-1);
/*
* Bid of 29 here comes from:
* + 16 bits for "PK",
* + next 16-bit field has 6 options so contributes
* about 16 - log_2(6) ~= 16 - 2.6 ~= 13 bits
*
* So we've effectively verified ~29 total bits of check data.
*/
if (p[0] == 'P' && p[1] == 'K') {
if ((p[2] == '\001' && p[3] == '\002')
|| (p[2] == '\003' && p[3] == '\004')
|| (p[2] == '\005' && p[3] == '\006')
|| (p[2] == '\006' && p[3] == '\006')
|| (p[2] == '\007' && p[3] == '\010')
|| (p[2] == '0' && p[3] == '0'))
return (29);
}
/* TODO: It's worth looking ahead a little bit for a valid
* PK signature. In particular, that would make it possible
* to read some UUEncoded SFX files or SFX files coming from
* a network socket. */
return (0);
}
static int
archive_read_format_zip_streamable_read_header(struct archive_read *a,
struct archive_entry *entry)
{
struct zip *zip;
a->archive.archive_format = ARCHIVE_FORMAT_ZIP;
if (a->archive.archive_format_name == NULL)
a->archive.archive_format_name = "ZIP";
zip = (struct zip *)(a->format->data);
/*
* It should be sufficient to call archive_read_next_header() for
* a reader to determine if an entry is encrypted or not. If the
* encryption of an entry is only detectable when calling
* archive_read_data(), so be it. We'll do the same check there
* as well.
*/
if (zip->has_encrypted_entries ==
ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW)
zip->has_encrypted_entries = 0;
/* Make sure we have a zip_entry structure to use. */
if (zip->zip_entries == NULL) {
zip->zip_entries = malloc(sizeof(struct zip_entry));
if (zip->zip_entries == NULL) {
archive_set_error(&a->archive, ENOMEM,
"Out of memory");
return ARCHIVE_FATAL;
}
}
zip->entry = zip->zip_entries;
memset(zip->entry, 0, sizeof(struct zip_entry));
if (zip->cctx_valid)
archive_decrypto_aes_ctr_release(&zip->cctx);
if (zip->hctx_valid)
archive_hmac_sha1_cleanup(&zip->hctx);
zip->tctx_valid = zip->cctx_valid = zip->hctx_valid = 0;
__archive_read_reset_passphrase(a);
/* Search ahead for the next local file header. */
__archive_read_consume(a, zip->unconsumed);
zip->unconsumed = 0;
for (;;) {
int64_t skipped = 0;
const char *p, *end;
ssize_t bytes;
p = __archive_read_ahead(a, 4, &bytes);
if (p == NULL)
return (ARCHIVE_FATAL);
end = p + bytes;
while (p + 4 <= end) {
if (p[0] == 'P' && p[1] == 'K') {
if (p[2] == '\003' && p[3] == '\004') {
/* Regular file entry. */
__archive_read_consume(a, skipped);
return zip_read_local_file_header(a,
entry, zip);
}
/*
* TODO: We cannot restore permissions
* based only on the local file headers.
* Consider scanning the central
* directory and returning additional
* entries for at least directories.
* This would allow us to properly set
* directory permissions.
*
* This won't help us fix symlinks
* and may not help with regular file
* permissions, either. <sigh>
*/
if (p[2] == '\001' && p[3] == '\002') {
return (ARCHIVE_EOF);
}
/* End of central directory? Must be an
* empty archive. */
if ((p[2] == '\005' && p[3] == '\006')
|| (p[2] == '\006' && p[3] == '\006'))
return (ARCHIVE_EOF);
}
++p;
++skipped;
}
__archive_read_consume(a, skipped);
}
}
static int
archive_read_format_zip_read_data_skip_streamable(struct archive_read *a)
{
struct zip *zip;
int64_t bytes_skipped;
zip = (struct zip *)(a->format->data);
bytes_skipped = __archive_read_consume(a, zip->unconsumed);
zip->unconsumed = 0;
if (bytes_skipped < 0)
return (ARCHIVE_FATAL);
/* If we've already read to end of data, we're done. */
if (zip->end_of_entry)
return (ARCHIVE_OK);
/* So we know we're streaming... */
if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
|| zip->entry->compressed_size > 0) {
/* We know the compressed length, so we can just skip. */
bytes_skipped = __archive_read_consume(a,
zip->entry_bytes_remaining);
if (bytes_skipped < 0)
return (ARCHIVE_FATAL);
return (ARCHIVE_OK);
}
if (zip->init_decryption) {
int r;
zip->has_encrypted_entries = 1;
if (zip->entry->zip_flags & ZIP_STRONG_ENCRYPTED)
r = read_decryption_header(a);
else if (zip->entry->compression == WINZIP_AES_ENCRYPTION)
r = init_WinZip_AES_decryption(a);
else
r = init_traditional_PKWARE_decryption(a);
if (r != ARCHIVE_OK)
return (r);
zip->init_decryption = 0;
}
/* We're streaming and we don't know the length. */
/* If the body is compressed and we know the format, we can
* find an exact end-of-entry by decompressing it. */
switch (zip->entry->compression) {
#ifdef HAVE_ZLIB_H
case 8: /* Deflate compression. */
while (!zip->end_of_entry) {
int64_t offset = 0;
const void *buff = NULL;
size_t size = 0;
int r;
r = zip_read_data_deflate(a, &buff, &size, &offset);
if (r != ARCHIVE_OK)
return (r);
}
return ARCHIVE_OK;
#endif
default: /* Uncompressed or unknown. */
/* Scan for a PK\007\010 signature. */
for (;;) {
const char *p, *buff;
ssize_t bytes_avail;
buff = __archive_read_ahead(a, 16, &bytes_avail);
if (bytes_avail < 16) {
archive_set_error(&a->archive,
ARCHIVE_ERRNO_FILE_FORMAT,
"Truncated ZIP file data");
return (ARCHIVE_FATAL);
}
p = buff;
while (p <= buff + bytes_avail - 16) {
if (p[3] == 'P') { p += 3; }
else if (p[3] == 'K') { p += 2; }
else if (p[3] == '\007') { p += 1; }
else if (p[3] == '\010' && p[2] == '\007'
&& p[1] == 'K' && p[0] == 'P') {
if (zip->entry->flags & LA_USED_ZIP64)
__archive_read_consume(a,
p - buff + 24);
else
__archive_read_consume(a,
p - buff + 16);
return ARCHIVE_OK;
} else { p += 4; }
}
__archive_read_consume(a, p - buff);
}
}
}
int
archive_read_support_format_zip_streamable(struct archive *_a)
{
struct archive_read *a = (struct archive_read *)_a;
struct zip *zip;
int r;
archive_check_magic(_a, ARCHIVE_READ_MAGIC,
ARCHIVE_STATE_NEW, "archive_read_support_format_zip");
zip = (struct zip *)calloc(1, sizeof(*zip));
if (zip == NULL) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate zip data");
return (ARCHIVE_FATAL);
}
/* Streamable reader doesn't support mac extensions. */
zip->process_mac_extensions = 0;
/*
* Until enough data has been read, we cannot tell about
* any encrypted entries yet.
*/
zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW;
zip->crc32func = real_crc32;
r = __archive_read_register_format(a,
zip,
"zip",
archive_read_format_zip_streamable_bid,
archive_read_format_zip_options,
archive_read_format_zip_streamable_read_header,
archive_read_format_zip_read_data,
archive_read_format_zip_read_data_skip_streamable,
NULL,
archive_read_format_zip_cleanup,
archive_read_support_format_zip_capabilities_streamable,
archive_read_format_zip_has_encrypted_entries);
if (r != ARCHIVE_OK)
free(zip);
return (ARCHIVE_OK);
}
/* ------------------------------------------------------------------------ */
/*
* Seeking-mode support
*/
static int
archive_read_support_format_zip_capabilities_seekable(struct archive_read * a)
{
(void)a; /* UNUSED */
return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA |
ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA);
}
/*
* TODO: This is a performance sink because it forces the read core to
* drop buffered data from the start of file, which will then have to
* be re-read again if this bidder loses.
*
* We workaround this a little by passing in the best bid so far so
* that later bidders can do nothing if they know they'll never
* outbid. But we can certainly do better...
*/
static int
read_eocd(struct zip *zip, const char *p, int64_t current_offset)
{
/* Sanity-check the EOCD we've found. */
/* This must be the first volume. */
if (archive_le16dec(p + 4) != 0)
return 0;
/* Central directory must be on this volume. */
if (archive_le16dec(p + 4) != archive_le16dec(p + 6))
return 0;
/* All central directory entries must be on this volume. */
if (archive_le16dec(p + 10) != archive_le16dec(p + 8))
return 0;
/* Central directory can't extend beyond start of EOCD record. */
if (archive_le32dec(p + 16) + archive_le32dec(p + 12)
> current_offset)
return 0;
/* Save the central directory location for later use. */
zip->central_directory_offset = archive_le32dec(p + 16);
/* This is just a tiny bit higher than the maximum
returned by the streaming Zip bidder. This ensures
that the more accurate seeking Zip parser wins
whenever seek is available. */
return 32;
}
/*
* Examine Zip64 EOCD locator: If it's valid, store the information
* from it.
*/
static int
read_zip64_eocd(struct archive_read *a, struct zip *zip, const char *p)
{
int64_t eocd64_offset;
int64_t eocd64_size;
/* Sanity-check the locator record. */
/* Central dir must be on first volume. */
if (archive_le32dec(p + 4) != 0)
return 0;
/* Must be only a single volume. */
if (archive_le32dec(p + 16) != 1)
return 0;
/* Find the Zip64 EOCD record. */
eocd64_offset = archive_le64dec(p + 8);
if (__archive_read_seek(a, eocd64_offset, SEEK_SET) < 0)
return 0;
if ((p = __archive_read_ahead(a, 56, NULL)) == NULL)
return 0;
/* Make sure we can read all of it. */
eocd64_size = archive_le64dec(p + 4) + 12;
if (eocd64_size < 56 || eocd64_size > 16384)
return 0;
if ((p = __archive_read_ahead(a, (size_t)eocd64_size, NULL)) == NULL)
return 0;
/* Sanity-check the EOCD64 */
if (archive_le32dec(p + 16) != 0) /* Must be disk #0 */
return 0;
if (archive_le32dec(p + 20) != 0) /* CD must be on disk #0 */
return 0;
/* CD can't be split. */
if (archive_le64dec(p + 24) != archive_le64dec(p + 32))
return 0;
/* Save the central directory offset for later use. */
zip->central_directory_offset = archive_le64dec(p + 48);
return 32;
}
static int
archive_read_format_zip_seekable_bid(struct archive_read *a, int best_bid)
{
struct zip *zip = (struct zip *)a->format->data;
int64_t file_size, current_offset;
const char *p;
int i, tail;
/* If someone has already bid more than 32, then avoid
trashing the look-ahead buffers with a seek. */
if (best_bid > 32)
return (-1);
file_size = __archive_read_seek(a, 0, SEEK_END);
if (file_size <= 0)
return 0;
/* Search last 16k of file for end-of-central-directory
* record (which starts with PK\005\006) */
tail = (int)zipmin(1024 * 16, file_size);
current_offset = __archive_read_seek(a, -tail, SEEK_END);
if (current_offset < 0)
return 0;
if ((p = __archive_read_ahead(a, (size_t)tail, NULL)) == NULL)
return 0;
/* Boyer-Moore search backwards from the end, since we want
* to match the last EOCD in the file (there can be more than
* one if there is an uncompressed Zip archive as a member
* within this Zip archive). */
for (i = tail - 22; i > 0;) {
switch (p[i]) {
case 'P':
if (memcmp(p + i, "PK\005\006", 4) == 0) {
int ret = read_eocd(zip, p + i,
current_offset + i);
/* Zip64 EOCD locator precedes
* regular EOCD if present. */
if (i >= 20 && memcmp(p + i - 20, "PK\006\007", 4) == 0) {
int ret_zip64 = read_zip64_eocd(a, zip, p + i - 20);
if (ret_zip64 > ret)
ret = ret_zip64;
}
return (ret);
}
i -= 4;
break;
case 'K': i -= 1; break;
case 005: i -= 2; break;
case 006: i -= 3; break;
default: i -= 4; break;
}
}
return 0;
}
/* The red-black trees are only used in seeking mode to manage
* the in-memory copy of the central directory. */
static int
cmp_node(const struct archive_rb_node *n1, const struct archive_rb_node *n2)
{
const struct zip_entry *e1 = (const struct zip_entry *)n1;
const struct zip_entry *e2 = (const struct zip_entry *)n2;
if (e1->local_header_offset > e2->local_header_offset)
return -1;
if (e1->local_header_offset < e2->local_header_offset)
return 1;
return 0;
}
static int
cmp_key(const struct archive_rb_node *n, const void *key)
{
/* This function won't be called */
(void)n; /* UNUSED */
(void)key; /* UNUSED */
return 1;
}
static const struct archive_rb_tree_ops rb_ops = {
&cmp_node, &cmp_key
};
static int
rsrc_cmp_node(const struct archive_rb_node *n1,
const struct archive_rb_node *n2)
{
const struct zip_entry *e1 = (const struct zip_entry *)n1;
const struct zip_entry *e2 = (const struct zip_entry *)n2;
return (strcmp(e2->rsrcname.s, e1->rsrcname.s));
}
static int
rsrc_cmp_key(const struct archive_rb_node *n, const void *key)
{
const struct zip_entry *e = (const struct zip_entry *)n;
return (strcmp((const char *)key, e->rsrcname.s));
}
static const struct archive_rb_tree_ops rb_rsrc_ops = {
&rsrc_cmp_node, &rsrc_cmp_key
};
static const char *
rsrc_basename(const char *name, size_t name_length)
{
const char *s, *r;
r = s = name;
for (;;) {
s = memchr(s, '/', name_length - (s - name));
if (s == NULL)
break;
r = ++s;
}
return (r);
}
static void
expose_parent_dirs(struct zip *zip, const char *name, size_t name_length)
{
struct archive_string str;
struct zip_entry *dir;
char *s;
archive_string_init(&str);
archive_strncpy(&str, name, name_length);
for (;;) {
s = strrchr(str.s, '/');
if (s == NULL)
break;
*s = '\0';
/* Transfer the parent directory from zip->tree_rsrc RB
* tree to zip->tree RB tree to expose. */
dir = (struct zip_entry *)
__archive_rb_tree_find_node(&zip->tree_rsrc, str.s);
if (dir == NULL)
break;
__archive_rb_tree_remove_node(&zip->tree_rsrc, &dir->node);
archive_string_free(&dir->rsrcname);
__archive_rb_tree_insert_node(&zip->tree, &dir->node);
}
archive_string_free(&str);
}
static int
slurp_central_directory(struct archive_read *a, struct zip *zip)
{
ssize_t i;
unsigned found;
int64_t correction;
ssize_t bytes_avail;
const char *p;
/*
* Find the start of the central directory. The end-of-CD
* record has our starting point, but there are lots of
* Zip archives which have had other data prepended to the
* file, which makes the recorded offsets all too small.
* So we search forward from the specified offset until we
* find the real start of the central directory. Then we
* know the correction we need to apply to account for leading
* padding.
*/
if (__archive_read_seek(a, zip->central_directory_offset, SEEK_SET) < 0)
return ARCHIVE_FATAL;
found = 0;
while (!found) {
if ((p = __archive_read_ahead(a, 20, &bytes_avail)) == NULL)
return ARCHIVE_FATAL;
for (found = 0, i = 0; !found && i < bytes_avail - 4;) {
switch (p[i + 3]) {
case 'P': i += 3; break;
case 'K': i += 2; break;
case 001: i += 1; break;
case 002:
if (memcmp(p + i, "PK\001\002", 4) == 0) {
p += i;
found = 1;
} else
i += 4;
break;
case 005: i += 1; break;
case 006:
if (memcmp(p + i, "PK\005\006", 4) == 0) {
p += i;
found = 1;
} else if (memcmp(p + i, "PK\006\006", 4) == 0) {
p += i;
found = 1;
} else
i += 1;
break;
default: i += 4; break;
}
}
__archive_read_consume(a, i);
}
correction = archive_filter_bytes(&a->archive, 0)
- zip->central_directory_offset;
__archive_rb_tree_init(&zip->tree, &rb_ops);
__archive_rb_tree_init(&zip->tree_rsrc, &rb_rsrc_ops);
zip->central_directory_entries_total = 0;
while (1) {
struct zip_entry *zip_entry;
size_t filename_length, extra_length, comment_length;
uint32_t external_attributes;
const char *name, *r;
if ((p = __archive_read_ahead(a, 4, NULL)) == NULL)
return ARCHIVE_FATAL;
if (memcmp(p, "PK\006\006", 4) == 0
|| memcmp(p, "PK\005\006", 4) == 0) {
break;
} else if (memcmp(p, "PK\001\002", 4) != 0) {
archive_set_error(&a->archive,
-1, "Invalid central directory signature");
return ARCHIVE_FATAL;
}
if ((p = __archive_read_ahead(a, 46, NULL)) == NULL)
return ARCHIVE_FATAL;
zip_entry = calloc(1, sizeof(struct zip_entry));
zip_entry->next = zip->zip_entries;
zip_entry->flags |= LA_FROM_CENTRAL_DIRECTORY;
zip->zip_entries = zip_entry;
zip->central_directory_entries_total++;
/* version = p[4]; */
zip_entry->system = p[5];
/* version_required = archive_le16dec(p + 6); */
zip_entry->zip_flags = archive_le16dec(p + 8);
if (zip_entry->zip_flags
& (ZIP_ENCRYPTED | ZIP_STRONG_ENCRYPTED)){
zip->has_encrypted_entries = 1;
}
zip_entry->compression = (char)archive_le16dec(p + 10);
zip_entry->mtime = zip_time(p + 12);
zip_entry->crc32 = archive_le32dec(p + 16);
if (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
zip_entry->decdat = p[13];
else
zip_entry->decdat = p[19];
zip_entry->compressed_size = archive_le32dec(p + 20);
zip_entry->uncompressed_size = archive_le32dec(p + 24);
filename_length = archive_le16dec(p + 28);
extra_length = archive_le16dec(p + 30);
comment_length = archive_le16dec(p + 32);
/* disk_start = archive_le16dec(p + 34); */ /* Better be zero. */
/* internal_attributes = archive_le16dec(p + 36); */ /* text bit */
external_attributes = archive_le32dec(p + 38);
zip_entry->local_header_offset =
archive_le32dec(p + 42) + correction;
/* If we can't guess the mode, leave it zero here;
when we read the local file header we might get
more information. */
if (zip_entry->system == 3) {
zip_entry->mode = external_attributes >> 16;
} else if (zip_entry->system == 0) {
// Interpret MSDOS directory bit
if (0x10 == (external_attributes & 0x10)) {
zip_entry->mode = AE_IFDIR | 0775;
} else {
zip_entry->mode = AE_IFREG | 0664;
}
if (0x01 == (external_attributes & 0x01)) {
// Read-only bit; strip write permissions
zip_entry->mode &= 0555;
}
} else {
zip_entry->mode = 0;
}
/* We're done with the regular data; get the filename and
* extra data. */
__archive_read_consume(a, 46);
p = __archive_read_ahead(a, filename_length + extra_length,
NULL);
if (p == NULL) {
archive_set_error(&a->archive,
ARCHIVE_ERRNO_FILE_FORMAT,
"Truncated ZIP file header");
return ARCHIVE_FATAL;
}
if (ARCHIVE_OK != process_extra(a, p + filename_length, extra_length, zip_entry)) {
return ARCHIVE_FATAL;
}
/*
* Mac resource fork files are stored under the
* "__MACOSX/" directory, so we should check if
* it is.
*/
if (!zip->process_mac_extensions) {
/* Treat every entry as a regular entry. */
__archive_rb_tree_insert_node(&zip->tree,
&zip_entry->node);
} else {
name = p;
r = rsrc_basename(name, filename_length);
if (filename_length >= 9 &&
strncmp("__MACOSX/", name, 9) == 0) {
/* If this file is not a resource fork nor
* a directory. We should treat it as a non
* resource fork file to expose it. */
if (name[filename_length-1] != '/' &&
(r - name < 3 || r[0] != '.' || r[1] != '_')) {
__archive_rb_tree_insert_node(
&zip->tree, &zip_entry->node);
/* Expose its parent directories. */
expose_parent_dirs(zip, name,
filename_length);
} else {
/* This file is a resource fork file or
* a directory. */
archive_strncpy(&(zip_entry->rsrcname),
name, filename_length);
__archive_rb_tree_insert_node(
&zip->tree_rsrc, &zip_entry->node);
}
} else {
/* Generate resource fork name to find its
* resource file at zip->tree_rsrc. */
archive_strcpy(&(zip_entry->rsrcname),
"__MACOSX/");
archive_strncat(&(zip_entry->rsrcname),
name, r - name);
archive_strcat(&(zip_entry->rsrcname), "._");
archive_strncat(&(zip_entry->rsrcname),
name + (r - name),
filename_length - (r - name));
/* Register an entry to RB tree to sort it by
* file offset. */
__archive_rb_tree_insert_node(&zip->tree,
&zip_entry->node);
}
}
/* Skip the comment too ... */
__archive_read_consume(a,
filename_length + extra_length + comment_length);
}
return ARCHIVE_OK;
}
static ssize_t
zip_get_local_file_header_size(struct archive_read *a, size_t extra)
{
const char *p;
ssize_t filename_length, extra_length;
if ((p = __archive_read_ahead(a, extra + 30, NULL)) == NULL) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Truncated ZIP file header");
return (ARCHIVE_WARN);
}
p += extra;
if (memcmp(p, "PK\003\004", 4) != 0) {
archive_set_error(&a->archive, -1, "Damaged Zip archive");
return ARCHIVE_WARN;
}
filename_length = archive_le16dec(p + 26);
extra_length = archive_le16dec(p + 28);
return (30 + filename_length + extra_length);
}
static int
zip_read_mac_metadata(struct archive_read *a, struct archive_entry *entry,
struct zip_entry *rsrc)
{
struct zip *zip = (struct zip *)a->format->data;
unsigned char *metadata, *mp;
int64_t offset = archive_filter_bytes(&a->archive, 0);
size_t remaining_bytes, metadata_bytes;
ssize_t hsize;
int ret = ARCHIVE_OK, eof;
switch(rsrc->compression) {
case 0: /* No compression. */
if (rsrc->uncompressed_size != rsrc->compressed_size) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Malformed OS X metadata entry: inconsistent size");
return (ARCHIVE_FATAL);
}
#ifdef HAVE_ZLIB_H
case 8: /* Deflate compression. */
#endif
break;
default: /* Unsupported compression. */
/* Return a warning. */
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Unsupported ZIP compression method (%s)",
compression_name(rsrc->compression));
/* We can't decompress this entry, but we will
* be able to skip() it and try the next entry. */
return (ARCHIVE_WARN);
}
if (rsrc->uncompressed_size > (4 * 1024 * 1024)) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Mac metadata is too large: %jd > 4M bytes",
(intmax_t)rsrc->uncompressed_size);
return (ARCHIVE_WARN);
}
if (rsrc->compressed_size > (4 * 1024 * 1024)) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Mac metadata is too large: %jd > 4M bytes",
(intmax_t)rsrc->compressed_size);
return (ARCHIVE_WARN);
}
metadata = malloc((size_t)rsrc->uncompressed_size);
if (metadata == NULL) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate memory for Mac metadata");
return (ARCHIVE_FATAL);
}
if (offset < rsrc->local_header_offset)
__archive_read_consume(a, rsrc->local_header_offset - offset);
else if (offset != rsrc->local_header_offset) {
__archive_read_seek(a, rsrc->local_header_offset, SEEK_SET);
}
hsize = zip_get_local_file_header_size(a, 0);
__archive_read_consume(a, hsize);
remaining_bytes = (size_t)rsrc->compressed_size;
metadata_bytes = (size_t)rsrc->uncompressed_size;
mp = metadata;
eof = 0;
while (!eof && remaining_bytes) {
const unsigned char *p;
ssize_t bytes_avail;
size_t bytes_used;
p = __archive_read_ahead(a, 1, &bytes_avail);
if (p == NULL) {
archive_set_error(&a->archive,
ARCHIVE_ERRNO_FILE_FORMAT,
"Truncated ZIP file header");
ret = ARCHIVE_WARN;
goto exit_mac_metadata;
}
if ((size_t)bytes_avail > remaining_bytes)
bytes_avail = remaining_bytes;
switch(rsrc->compression) {
case 0: /* No compression. */
if ((size_t)bytes_avail > metadata_bytes)
bytes_avail = metadata_bytes;
memcpy(mp, p, bytes_avail);
bytes_used = (size_t)bytes_avail;
metadata_bytes -= bytes_used;
mp += bytes_used;
if (metadata_bytes == 0)
eof = 1;
break;
#ifdef HAVE_ZLIB_H
case 8: /* Deflate compression. */
{
int r;
ret = zip_deflate_init(a, zip);
if (ret != ARCHIVE_OK)
goto exit_mac_metadata;
zip->stream.next_in =
(Bytef *)(uintptr_t)(const void *)p;
zip->stream.avail_in = (uInt)bytes_avail;
zip->stream.total_in = 0;
zip->stream.next_out = mp;
zip->stream.avail_out = (uInt)metadata_bytes;
zip->stream.total_out = 0;
r = inflate(&zip->stream, 0);
switch (r) {
case Z_OK:
break;
case Z_STREAM_END:
eof = 1;
break;
case Z_MEM_ERROR:
archive_set_error(&a->archive, ENOMEM,
"Out of memory for ZIP decompression");
ret = ARCHIVE_FATAL;
goto exit_mac_metadata;
default:
archive_set_error(&a->archive,
ARCHIVE_ERRNO_MISC,
"ZIP decompression failed (%d)", r);
ret = ARCHIVE_FATAL;
goto exit_mac_metadata;
}
bytes_used = zip->stream.total_in;
metadata_bytes -= zip->stream.total_out;
mp += zip->stream.total_out;
break;
}
#endif
default:
bytes_used = 0;
break;
}
__archive_read_consume(a, bytes_used);
remaining_bytes -= bytes_used;
}
archive_entry_copy_mac_metadata(entry, metadata,
(size_t)rsrc->uncompressed_size - metadata_bytes);
exit_mac_metadata:
__archive_read_seek(a, offset, SEEK_SET);
zip->decompress_init = 0;
free(metadata);
return (ret);
}
static int
archive_read_format_zip_seekable_read_header(struct archive_read *a,
struct archive_entry *entry)
{
struct zip *zip = (struct zip *)a->format->data;
struct zip_entry *rsrc;
int64_t offset;
int r, ret = ARCHIVE_OK;
/*
* It should be sufficient to call archive_read_next_header() for
* a reader to determine if an entry is encrypted or not. If the
* encryption of an entry is only detectable when calling
* archive_read_data(), so be it. We'll do the same check there
* as well.
*/
if (zip->has_encrypted_entries ==
ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW)
zip->has_encrypted_entries = 0;
a->archive.archive_format = ARCHIVE_FORMAT_ZIP;
if (a->archive.archive_format_name == NULL)
a->archive.archive_format_name = "ZIP";
if (zip->zip_entries == NULL) {
r = slurp_central_directory(a, zip);
if (r != ARCHIVE_OK)
return r;
/* Get first entry whose local header offset is lower than
* other entries in the archive file. */
zip->entry =
(struct zip_entry *)ARCHIVE_RB_TREE_MIN(&zip->tree);
} else if (zip->entry != NULL) {
/* Get next entry in local header offset order. */
zip->entry = (struct zip_entry *)__archive_rb_tree_iterate(
&zip->tree, &zip->entry->node, ARCHIVE_RB_DIR_RIGHT);
}
if (zip->entry == NULL)
return ARCHIVE_EOF;
if (zip->entry->rsrcname.s)
rsrc = (struct zip_entry *)__archive_rb_tree_find_node(
&zip->tree_rsrc, zip->entry->rsrcname.s);
else
rsrc = NULL;
if (zip->cctx_valid)
archive_decrypto_aes_ctr_release(&zip->cctx);
if (zip->hctx_valid)
archive_hmac_sha1_cleanup(&zip->hctx);
zip->tctx_valid = zip->cctx_valid = zip->hctx_valid = 0;
__archive_read_reset_passphrase(a);
/* File entries are sorted by the header offset, we should mostly
* use __archive_read_consume to advance a read point to avoid redundant
* data reading. */
offset = archive_filter_bytes(&a->archive, 0);
if (offset < zip->entry->local_header_offset)
__archive_read_consume(a,
zip->entry->local_header_offset - offset);
else if (offset != zip->entry->local_header_offset) {
__archive_read_seek(a, zip->entry->local_header_offset,
SEEK_SET);
}
zip->unconsumed = 0;
r = zip_read_local_file_header(a, entry, zip);
if (r != ARCHIVE_OK)
return r;
if (rsrc) {
int ret2 = zip_read_mac_metadata(a, entry, rsrc);
if (ret2 < ret)
ret = ret2;
}
return (ret);
}
/*
* We're going to seek for the next header anyway, so we don't
* need to bother doing anything here.
*/
static int
archive_read_format_zip_read_data_skip_seekable(struct archive_read *a)
{
struct zip *zip;
zip = (struct zip *)(a->format->data);
zip->unconsumed = 0;
return (ARCHIVE_OK);
}
int
archive_read_support_format_zip_seekable(struct archive *_a)
{
struct archive_read *a = (struct archive_read *)_a;
struct zip *zip;
int r;
archive_check_magic(_a, ARCHIVE_READ_MAGIC,
ARCHIVE_STATE_NEW, "archive_read_support_format_zip_seekable");
zip = (struct zip *)calloc(1, sizeof(*zip));
if (zip == NULL) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate zip data");
return (ARCHIVE_FATAL);
}
#ifdef HAVE_COPYFILE_H
/* Set this by default on Mac OS. */
zip->process_mac_extensions = 1;
#endif
/*
* Until enough data has been read, we cannot tell about
* any encrypted entries yet.
*/
zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW;
zip->crc32func = real_crc32;
r = __archive_read_register_format(a,
zip,
"zip",
archive_read_format_zip_seekable_bid,
archive_read_format_zip_options,
archive_read_format_zip_seekable_read_header,
archive_read_format_zip_read_data,
archive_read_format_zip_read_data_skip_seekable,
NULL,
archive_read_format_zip_cleanup,
archive_read_support_format_zip_capabilities_seekable,
archive_read_format_zip_has_encrypted_entries);
if (r != ARCHIVE_OK)
free(zip);
return (ARCHIVE_OK);
}