| /*- |
| * 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 <cm_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); |
| } |