archive_read_support_format_zip.c revision 368707
1/*- 2 * Copyright (c) 2004-2013 Tim Kientzle 3 * Copyright (c) 2011-2012,2014 Michihiro NAKAJIMA 4 * Copyright (c) 2013 Konrad Kleine 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28#include "archive_platform.h" 29__FBSDID("$FreeBSD: stable/11/contrib/libarchive/libarchive/archive_read_support_format_zip.c 368707 2020-12-16 22:25:20Z mm $"); 30 31/* 32 * The definitive documentation of the Zip file format is: 33 * http://www.pkware.com/documents/casestudies/APPNOTE.TXT 34 * 35 * The Info-Zip project has pioneered various extensions to better 36 * support Zip on Unix, including the 0x5455 "UT", 0x5855 "UX", 0x7855 37 * "Ux", and 0x7875 "ux" extensions for time and ownership 38 * information. 39 * 40 * History of this code: The streaming Zip reader was first added to 41 * libarchive in January 2005. Support for seekable input sources was 42 * added in Nov 2011. Zip64 support (including a significant code 43 * refactoring) was added in 2014. 44 */ 45 46#ifdef HAVE_ERRNO_H 47#include <errno.h> 48#endif 49#ifdef HAVE_STDLIB_H 50#include <stdlib.h> 51#endif 52#ifdef HAVE_ZLIB_H 53#include <zlib.h> 54#endif 55#ifdef HAVE_BZLIB_H 56#include <bzlib.h> 57#endif 58#ifdef HAVE_LZMA_H 59#include <lzma.h> 60#endif 61 62#include "archive.h" 63#include "archive_digest_private.h" 64#include "archive_cryptor_private.h" 65#include "archive_endian.h" 66#include "archive_entry.h" 67#include "archive_entry_locale.h" 68#include "archive_hmac_private.h" 69#include "archive_private.h" 70#include "archive_rb.h" 71#include "archive_read_private.h" 72#include "archive_ppmd8_private.h" 73 74#ifndef HAVE_ZLIB_H 75#include "archive_crc32.h" 76#endif 77 78struct zip_entry { 79 struct archive_rb_node node; 80 struct zip_entry *next; 81 int64_t local_header_offset; 82 int64_t compressed_size; 83 int64_t uncompressed_size; 84 int64_t gid; 85 int64_t uid; 86 struct archive_string rsrcname; 87 time_t mtime; 88 time_t atime; 89 time_t ctime; 90 uint32_t crc32; 91 uint16_t mode; 92 uint16_t zip_flags; /* From GP Flags Field */ 93 unsigned char compression; 94 unsigned char system; /* From "version written by" */ 95 unsigned char flags; /* Our extra markers. */ 96 unsigned char decdat;/* Used for Decryption check */ 97 98 /* WinZip AES encryption extra field should be available 99 * when compression is 99. */ 100 struct { 101 /* Vendor version: AE-1 - 0x0001, AE-2 - 0x0002 */ 102 unsigned vendor; 103#define AES_VENDOR_AE_1 0x0001 104#define AES_VENDOR_AE_2 0x0002 105 /* AES encryption strength: 106 * 1 - 128 bits, 2 - 192 bits, 2 - 256 bits. */ 107 unsigned strength; 108 /* Actual compression method. */ 109 unsigned char compression; 110 } aes_extra; 111}; 112 113struct trad_enc_ctx { 114 uint32_t keys[3]; 115}; 116 117/* Bits used in zip_flags. */ 118#define ZIP_ENCRYPTED (1 << 0) 119#define ZIP_LENGTH_AT_END (1 << 3) 120#define ZIP_STRONG_ENCRYPTED (1 << 6) 121#define ZIP_UTF8_NAME (1 << 11) 122/* See "7.2 Single Password Symmetric Encryption Method" 123 in http://www.pkware.com/documents/casestudies/APPNOTE.TXT */ 124#define ZIP_CENTRAL_DIRECTORY_ENCRYPTED (1 << 13) 125 126/* Bits used in flags. */ 127#define LA_USED_ZIP64 (1 << 0) 128#define LA_FROM_CENTRAL_DIRECTORY (1 << 1) 129 130/* 131 * See "WinZip - AES Encryption Information" 132 * http://www.winzip.com/aes_info.htm 133 */ 134/* Value used in compression method. */ 135#define WINZIP_AES_ENCRYPTION 99 136/* Authentication code size. */ 137#define AUTH_CODE_SIZE 10 138/**/ 139#define MAX_DERIVED_KEY_BUF_SIZE (AES_MAX_KEY_SIZE * 2 + 2) 140 141struct zip { 142 /* Structural information about the archive. */ 143 struct archive_string format_name; 144 int64_t central_directory_offset; 145 size_t central_directory_entries_total; 146 size_t central_directory_entries_on_this_disk; 147 int has_encrypted_entries; 148 149 /* List of entries (seekable Zip only) */ 150 struct zip_entry *zip_entries; 151 struct archive_rb_tree tree; 152 struct archive_rb_tree tree_rsrc; 153 154 /* Bytes read but not yet consumed via __archive_read_consume() */ 155 size_t unconsumed; 156 157 /* Information about entry we're currently reading. */ 158 struct zip_entry *entry; 159 int64_t entry_bytes_remaining; 160 161 /* These count the number of bytes actually read for the entry. */ 162 int64_t entry_compressed_bytes_read; 163 int64_t entry_uncompressed_bytes_read; 164 165 /* Running CRC32 of the decompressed data */ 166 unsigned long entry_crc32; 167 unsigned long (*crc32func)(unsigned long, const void *, 168 size_t); 169 char ignore_crc32; 170 171 /* Flags to mark progress of decompression. */ 172 char decompress_init; 173 char end_of_entry; 174 175 unsigned char *uncompressed_buffer; 176 size_t uncompressed_buffer_size; 177 178#ifdef HAVE_ZLIB_H 179 z_stream stream; 180 char stream_valid; 181#endif 182 183#if HAVE_LZMA_H && HAVE_LIBLZMA 184 lzma_stream zipx_lzma_stream; 185 char zipx_lzma_valid; 186#endif 187 188#ifdef HAVE_BZLIB_H 189 bz_stream bzstream; 190 char bzstream_valid; 191#endif 192 193 IByteIn zipx_ppmd_stream; 194 ssize_t zipx_ppmd_read_compressed; 195 CPpmd8 ppmd8; 196 char ppmd8_valid; 197 char ppmd8_stream_failed; 198 199 struct archive_string_conv *sconv; 200 struct archive_string_conv *sconv_default; 201 struct archive_string_conv *sconv_utf8; 202 int init_default_conversion; 203 int process_mac_extensions; 204 205 char init_decryption; 206 207 /* Decryption buffer. */ 208 /* 209 * The decrypted data starts at decrypted_ptr and 210 * extends for decrypted_bytes_remaining. Decryption 211 * adds new data to the end of this block, data is returned 212 * to clients from the beginning. When the block hits the 213 * end of decrypted_buffer, it has to be shuffled back to 214 * the beginning of the buffer. 215 */ 216 unsigned char *decrypted_buffer; 217 unsigned char *decrypted_ptr; 218 size_t decrypted_buffer_size; 219 size_t decrypted_bytes_remaining; 220 size_t decrypted_unconsumed_bytes; 221 222 /* Traditional PKWARE decryption. */ 223 struct trad_enc_ctx tctx; 224 char tctx_valid; 225 226 /* WinZip AES decryption. */ 227 /* Contexts used for AES decryption. */ 228 archive_crypto_ctx cctx; 229 char cctx_valid; 230 archive_hmac_sha1_ctx hctx; 231 char hctx_valid; 232 233 /* Strong encryption's decryption header information. */ 234 unsigned iv_size; 235 unsigned alg_id; 236 unsigned bit_len; 237 unsigned flags; 238 unsigned erd_size; 239 unsigned v_size; 240 unsigned v_crc32; 241 uint8_t *iv; 242 uint8_t *erd; 243 uint8_t *v_data; 244}; 245 246/* Many systems define min or MIN, but not all. */ 247#define zipmin(a,b) ((a) < (b) ? (a) : (b)) 248 249/* This function is used by Ppmd8_DecodeSymbol during decompression of Ppmd8 250 * streams inside ZIP files. It has 2 purposes: one is to fetch the next 251 * compressed byte from the stream, second one is to increase the counter how 252 * many compressed bytes were read. */ 253static Byte 254ppmd_read(void* p) { 255 /* Get the handle to current decompression context. */ 256 struct archive_read *a = ((IByteIn*)p)->a; 257 struct zip *zip = (struct zip*) a->format->data; 258 ssize_t bytes_avail = 0; 259 260 /* Fetch next byte. */ 261 const uint8_t* data = __archive_read_ahead(a, 1, &bytes_avail); 262 if(bytes_avail < 1) { 263 zip->ppmd8_stream_failed = 1; 264 return 0; 265 } 266 267 __archive_read_consume(a, 1); 268 269 /* Increment the counter. */ 270 ++zip->zipx_ppmd_read_compressed; 271 272 /* Return the next compressed byte. */ 273 return data[0]; 274} 275 276/* ------------------------------------------------------------------------ */ 277 278/* 279 Traditional PKWARE Decryption functions. 280 */ 281 282static void 283trad_enc_update_keys(struct trad_enc_ctx *ctx, uint8_t c) 284{ 285 uint8_t t; 286#define CRC32(c, b) (crc32(c ^ 0xffffffffUL, &b, 1) ^ 0xffffffffUL) 287 288 ctx->keys[0] = CRC32(ctx->keys[0], c); 289 ctx->keys[1] = (ctx->keys[1] + (ctx->keys[0] & 0xff)) * 134775813L + 1; 290 t = (ctx->keys[1] >> 24) & 0xff; 291 ctx->keys[2] = CRC32(ctx->keys[2], t); 292#undef CRC32 293} 294 295static uint8_t 296trad_enc_decrypt_byte(struct trad_enc_ctx *ctx) 297{ 298 unsigned temp = ctx->keys[2] | 2; 299 return (uint8_t)((temp * (temp ^ 1)) >> 8) & 0xff; 300} 301 302static void 303trad_enc_decrypt_update(struct trad_enc_ctx *ctx, const uint8_t *in, 304 size_t in_len, uint8_t *out, size_t out_len) 305{ 306 unsigned i, max; 307 308 max = (unsigned)((in_len < out_len)? in_len: out_len); 309 310 for (i = 0; i < max; i++) { 311 uint8_t t = in[i] ^ trad_enc_decrypt_byte(ctx); 312 out[i] = t; 313 trad_enc_update_keys(ctx, t); 314 } 315} 316 317static int 318trad_enc_init(struct trad_enc_ctx *ctx, const char *pw, size_t pw_len, 319 const uint8_t *key, size_t key_len, uint8_t *crcchk) 320{ 321 uint8_t header[12]; 322 323 if (key_len < 12) { 324 *crcchk = 0xff; 325 return -1; 326 } 327 328 ctx->keys[0] = 305419896L; 329 ctx->keys[1] = 591751049L; 330 ctx->keys[2] = 878082192L; 331 332 for (;pw_len; --pw_len) 333 trad_enc_update_keys(ctx, *pw++); 334 335 trad_enc_decrypt_update(ctx, key, 12, header, 12); 336 /* Return the last byte for CRC check. */ 337 *crcchk = header[11]; 338 return 0; 339} 340 341#if 0 342static void 343crypt_derive_key_sha1(const void *p, int size, unsigned char *key, 344 int key_size) 345{ 346#define MD_SIZE 20 347 archive_sha1_ctx ctx; 348 unsigned char md1[MD_SIZE]; 349 unsigned char md2[MD_SIZE * 2]; 350 unsigned char mkb[64]; 351 int i; 352 353 archive_sha1_init(&ctx); 354 archive_sha1_update(&ctx, p, size); 355 archive_sha1_final(&ctx, md1); 356 357 memset(mkb, 0x36, sizeof(mkb)); 358 for (i = 0; i < MD_SIZE; i++) 359 mkb[i] ^= md1[i]; 360 archive_sha1_init(&ctx); 361 archive_sha1_update(&ctx, mkb, sizeof(mkb)); 362 archive_sha1_final(&ctx, md2); 363 364 memset(mkb, 0x5C, sizeof(mkb)); 365 for (i = 0; i < MD_SIZE; i++) 366 mkb[i] ^= md1[i]; 367 archive_sha1_init(&ctx); 368 archive_sha1_update(&ctx, mkb, sizeof(mkb)); 369 archive_sha1_final(&ctx, md2 + MD_SIZE); 370 371 if (key_size > 32) 372 key_size = 32; 373 memcpy(key, md2, key_size); 374#undef MD_SIZE 375} 376#endif 377 378/* 379 * Common code for streaming or seeking modes. 380 * 381 * Includes code to read local file headers, decompress data 382 * from entry bodies, and common API. 383 */ 384 385static unsigned long 386real_crc32(unsigned long crc, const void *buff, size_t len) 387{ 388 return crc32(crc, buff, (unsigned int)len); 389} 390 391/* Used by "ignorecrc32" option to speed up tests. */ 392static unsigned long 393fake_crc32(unsigned long crc, const void *buff, size_t len) 394{ 395 (void)crc; /* UNUSED */ 396 (void)buff; /* UNUSED */ 397 (void)len; /* UNUSED */ 398 return 0; 399} 400 401static const struct { 402 int id; 403 const char * name; 404} compression_methods[] = { 405 {0, "uncompressed"}, /* The file is stored (no compression) */ 406 {1, "shrinking"}, /* The file is Shrunk */ 407 {2, "reduced-1"}, /* The file is Reduced with compression factor 1 */ 408 {3, "reduced-2"}, /* The file is Reduced with compression factor 2 */ 409 {4, "reduced-3"}, /* The file is Reduced with compression factor 3 */ 410 {5, "reduced-4"}, /* The file is Reduced with compression factor 4 */ 411 {6, "imploded"}, /* The file is Imploded */ 412 {7, "reserved"}, /* Reserved for Tokenizing compression algorithm */ 413 {8, "deflation"}, /* The file is Deflated */ 414 {9, "deflation-64-bit"}, /* Enhanced Deflating using Deflate64(tm) */ 415 {10, "ibm-terse"},/* PKWARE Data Compression Library Imploding 416 * (old IBM TERSE) */ 417 {11, "reserved"}, /* Reserved by PKWARE */ 418 {12, "bzip"}, /* File is compressed using BZIP2 algorithm */ 419 {13, "reserved"}, /* Reserved by PKWARE */ 420 {14, "lzma"}, /* LZMA (EFS) */ 421 {15, "reserved"}, /* Reserved by PKWARE */ 422 {16, "reserved"}, /* Reserved by PKWARE */ 423 {17, "reserved"}, /* Reserved by PKWARE */ 424 {18, "ibm-terse-new"}, /* File is compressed using IBM TERSE (new) */ 425 {19, "ibm-lz777"},/* IBM LZ77 z Architecture (PFS) */ 426 {95, "xz"}, /* XZ compressed data */ 427 {96, "jpeg"}, /* JPEG compressed data */ 428 {97, "wav-pack"}, /* WavPack compressed data */ 429 {98, "ppmd-1"}, /* PPMd version I, Rev 1 */ 430 {99, "aes"} /* WinZip AES encryption */ 431}; 432 433static const char * 434compression_name(const int compression) 435{ 436 static const int num_compression_methods = 437 sizeof(compression_methods)/sizeof(compression_methods[0]); 438 int i=0; 439 440 while(compression >= 0 && i < num_compression_methods) { 441 if (compression_methods[i].id == compression) 442 return compression_methods[i].name; 443 i++; 444 } 445 return "??"; 446} 447 448/* Convert an MSDOS-style date/time into Unix-style time. */ 449static time_t 450zip_time(const char *p) 451{ 452 int msTime, msDate; 453 struct tm ts; 454 455 msTime = (0xff & (unsigned)p[0]) + 256 * (0xff & (unsigned)p[1]); 456 msDate = (0xff & (unsigned)p[2]) + 256 * (0xff & (unsigned)p[3]); 457 458 memset(&ts, 0, sizeof(ts)); 459 ts.tm_year = ((msDate >> 9) & 0x7f) + 80; /* Years since 1900. */ 460 ts.tm_mon = ((msDate >> 5) & 0x0f) - 1; /* Month number. */ 461 ts.tm_mday = msDate & 0x1f; /* Day of month. */ 462 ts.tm_hour = (msTime >> 11) & 0x1f; 463 ts.tm_min = (msTime >> 5) & 0x3f; 464 ts.tm_sec = (msTime << 1) & 0x3e; 465 ts.tm_isdst = -1; 466 return mktime(&ts); 467} 468 469/* 470 * The extra data is stored as a list of 471 * id1+size1+data1 + id2+size2+data2 ... 472 * triplets. id and size are 2 bytes each. 473 */ 474static int 475process_extra(struct archive_read *a, struct archive_entry *entry, 476 const char *p, size_t extra_length, struct zip_entry* zip_entry) 477{ 478 unsigned offset = 0; 479 struct zip *zip = (struct zip *)(a->format->data); 480 481 if (extra_length == 0) { 482 return ARCHIVE_OK; 483 } 484 485 if (extra_length < 4) { 486 size_t i = 0; 487 /* Some ZIP files may have trailing 0 bytes. Let's check they 488 * are all 0 and ignore them instead of returning an error. 489 * 490 * This is not technically correct, but some ZIP files look 491 * like this and other tools support those files - so let's 492 * also support them. 493 */ 494 for (; i < extra_length; i++) { 495 if (p[i] != 0) { 496 archive_set_error(&a->archive, 497 ARCHIVE_ERRNO_FILE_FORMAT, 498 "Too-small extra data: " 499 "Need at least 4 bytes, " 500 "but only found %d bytes", 501 (int)extra_length); 502 return ARCHIVE_FAILED; 503 } 504 } 505 506 return ARCHIVE_OK; 507 } 508 509 while (offset <= extra_length - 4) { 510 unsigned short headerid = archive_le16dec(p + offset); 511 unsigned short datasize = archive_le16dec(p + offset + 2); 512 513 offset += 4; 514 if (offset + datasize > extra_length) { 515 archive_set_error(&a->archive, 516 ARCHIVE_ERRNO_FILE_FORMAT, "Extra data overflow: " 517 "Need %d bytes but only found %d bytes", 518 (int)datasize, (int)(extra_length - offset)); 519 return ARCHIVE_FAILED; 520 } 521#ifdef DEBUG 522 fprintf(stderr, "Header id 0x%04x, length %d\n", 523 headerid, datasize); 524#endif 525 switch (headerid) { 526 case 0x0001: 527 /* Zip64 extended information extra field. */ 528 zip_entry->flags |= LA_USED_ZIP64; 529 if (zip_entry->uncompressed_size == 0xffffffff) { 530 uint64_t t = 0; 531 if (datasize < 8 532 || (t = archive_le64dec(p + offset)) > 533 INT64_MAX) { 534 archive_set_error(&a->archive, 535 ARCHIVE_ERRNO_FILE_FORMAT, 536 "Malformed 64-bit " 537 "uncompressed size"); 538 return ARCHIVE_FAILED; 539 } 540 zip_entry->uncompressed_size = t; 541 offset += 8; 542 datasize -= 8; 543 } 544 if (zip_entry->compressed_size == 0xffffffff) { 545 uint64_t t = 0; 546 if (datasize < 8 547 || (t = archive_le64dec(p + offset)) > 548 INT64_MAX) { 549 archive_set_error(&a->archive, 550 ARCHIVE_ERRNO_FILE_FORMAT, 551 "Malformed 64-bit " 552 "compressed size"); 553 return ARCHIVE_FAILED; 554 } 555 zip_entry->compressed_size = t; 556 offset += 8; 557 datasize -= 8; 558 } 559 if (zip_entry->local_header_offset == 0xffffffff) { 560 uint64_t t = 0; 561 if (datasize < 8 562 || (t = archive_le64dec(p + offset)) > 563 INT64_MAX) { 564 archive_set_error(&a->archive, 565 ARCHIVE_ERRNO_FILE_FORMAT, 566 "Malformed 64-bit " 567 "local header offset"); 568 return ARCHIVE_FAILED; 569 } 570 zip_entry->local_header_offset = t; 571 offset += 8; 572 datasize -= 8; 573 } 574 /* archive_le32dec(p + offset) gives disk 575 * on which file starts, but we don't handle 576 * multi-volume Zip files. */ 577 break; 578#ifdef DEBUG 579 case 0x0017: 580 { 581 /* Strong encryption field. */ 582 if (archive_le16dec(p + offset) == 2) { 583 unsigned algId = 584 archive_le16dec(p + offset + 2); 585 unsigned bitLen = 586 archive_le16dec(p + offset + 4); 587 int flags = 588 archive_le16dec(p + offset + 6); 589 fprintf(stderr, "algId=0x%04x, bitLen=%u, " 590 "flgas=%d\n", algId, bitLen,flags); 591 } 592 break; 593 } 594#endif 595 case 0x5455: 596 { 597 /* Extended time field "UT". */ 598 int flags; 599 if (datasize == 0) { 600 archive_set_error(&a->archive, 601 ARCHIVE_ERRNO_FILE_FORMAT, 602 "Incomplete extended time field"); 603 return ARCHIVE_FAILED; 604 } 605 flags = p[offset]; 606 offset++; 607 datasize--; 608 /* Flag bits indicate which dates are present. */ 609 if (flags & 0x01) 610 { 611#ifdef DEBUG 612 fprintf(stderr, "mtime: %lld -> %d\n", 613 (long long)zip_entry->mtime, 614 archive_le32dec(p + offset)); 615#endif 616 if (datasize < 4) 617 break; 618 zip_entry->mtime = archive_le32dec(p + offset); 619 offset += 4; 620 datasize -= 4; 621 } 622 if (flags & 0x02) 623 { 624 if (datasize < 4) 625 break; 626 zip_entry->atime = archive_le32dec(p + offset); 627 offset += 4; 628 datasize -= 4; 629 } 630 if (flags & 0x04) 631 { 632 if (datasize < 4) 633 break; 634 zip_entry->ctime = archive_le32dec(p + offset); 635 offset += 4; 636 datasize -= 4; 637 } 638 break; 639 } 640 case 0x5855: 641 { 642 /* Info-ZIP Unix Extra Field (old version) "UX". */ 643 if (datasize >= 8) { 644 zip_entry->atime = archive_le32dec(p + offset); 645 zip_entry->mtime = 646 archive_le32dec(p + offset + 4); 647 } 648 if (datasize >= 12) { 649 zip_entry->uid = 650 archive_le16dec(p + offset + 8); 651 zip_entry->gid = 652 archive_le16dec(p + offset + 10); 653 } 654 break; 655 } 656 case 0x6c78: 657 { 658 /* Experimental 'xl' field */ 659 /* 660 * Introduced Dec 2013 to provide a way to 661 * include external file attributes (and other 662 * fields that ordinarily appear only in 663 * central directory) in local file header. 664 * This provides file type and permission 665 * information necessary to support full 666 * streaming extraction. Currently being 667 * discussed with other Zip developers 668 * ... subject to change. 669 * 670 * Format: 671 * The field starts with a bitmap that specifies 672 * which additional fields are included. The 673 * bitmap is variable length and can be extended in 674 * the future. 675 * 676 * n bytes - feature bitmap: first byte has low-order 677 * 7 bits. If high-order bit is set, a subsequent 678 * byte holds the next 7 bits, etc. 679 * 680 * if bitmap & 1, 2 byte "version made by" 681 * if bitmap & 2, 2 byte "internal file attributes" 682 * if bitmap & 4, 4 byte "external file attributes" 683 * if bitmap & 8, 2 byte comment length + n byte 684 * comment 685 */ 686 int bitmap, bitmap_last; 687 688 if (datasize < 1) 689 break; 690 bitmap_last = bitmap = 0xff & p[offset]; 691 offset += 1; 692 datasize -= 1; 693 694 /* We only support first 7 bits of bitmap; skip rest. */ 695 while ((bitmap_last & 0x80) != 0 696 && datasize >= 1) { 697 bitmap_last = p[offset]; 698 offset += 1; 699 datasize -= 1; 700 } 701 702 if (bitmap & 1) { 703 /* 2 byte "version made by" */ 704 if (datasize < 2) 705 break; 706 zip_entry->system 707 = archive_le16dec(p + offset) >> 8; 708 offset += 2; 709 datasize -= 2; 710 } 711 if (bitmap & 2) { 712 /* 2 byte "internal file attributes" */ 713 uint32_t internal_attributes; 714 if (datasize < 2) 715 break; 716 internal_attributes 717 = archive_le16dec(p + offset); 718 /* Not used by libarchive at present. */ 719 (void)internal_attributes; /* UNUSED */ 720 offset += 2; 721 datasize -= 2; 722 } 723 if (bitmap & 4) { 724 /* 4 byte "external file attributes" */ 725 uint32_t external_attributes; 726 if (datasize < 4) 727 break; 728 external_attributes 729 = archive_le32dec(p + offset); 730 if (zip_entry->system == 3) { 731 zip_entry->mode 732 = external_attributes >> 16; 733 } else if (zip_entry->system == 0) { 734 // Interpret MSDOS directory bit 735 if (0x10 == (external_attributes & 736 0x10)) { 737 zip_entry->mode = 738 AE_IFDIR | 0775; 739 } else { 740 zip_entry->mode = 741 AE_IFREG | 0664; 742 } 743 if (0x01 == (external_attributes & 744 0x01)) { 745 /* Read-only bit; 746 * strip write permissions */ 747 zip_entry->mode &= 0555; 748 } 749 } else { 750 zip_entry->mode = 0; 751 } 752 offset += 4; 753 datasize -= 4; 754 } 755 if (bitmap & 8) { 756 /* 2 byte comment length + comment */ 757 uint32_t comment_length; 758 if (datasize < 2) 759 break; 760 comment_length 761 = archive_le16dec(p + offset); 762 offset += 2; 763 datasize -= 2; 764 765 if (datasize < comment_length) 766 break; 767 /* Comment is not supported by libarchive */ 768 offset += comment_length; 769 datasize -= comment_length; 770 } 771 break; 772 } 773 case 0x7075: 774 { 775 /* Info-ZIP Unicode Path Extra Field. */ 776 if (datasize < 5 || entry == NULL) 777 break; 778 offset += 5; 779 datasize -= 5; 780 781 /* The path name in this field is always encoded 782 * in UTF-8. */ 783 if (zip->sconv_utf8 == NULL) { 784 zip->sconv_utf8 = 785 archive_string_conversion_from_charset( 786 &a->archive, "UTF-8", 1); 787 /* If the converter from UTF-8 is not 788 * available, then the path name from the main 789 * field will more likely be correct. */ 790 if (zip->sconv_utf8 == NULL) 791 break; 792 } 793 794 /* Make sure the CRC32 of the filename matches. */ 795 if (!zip->ignore_crc32) { 796 const char *cp = archive_entry_pathname(entry); 797 if (cp) { 798 unsigned long file_crc = 799 zip->crc32func(0, cp, strlen(cp)); 800 unsigned long utf_crc = 801 archive_le32dec(p + offset - 4); 802 if (file_crc != utf_crc) { 803#ifdef DEBUG 804 fprintf(stderr, 805 "CRC filename mismatch; " 806 "CDE is %lx, but UTF8 " 807 "is outdated with %lx\n", 808 file_crc, utf_crc); 809#endif 810 break; 811 } 812 } 813 } 814 815 if (archive_entry_copy_pathname_l(entry, 816 p + offset, datasize, zip->sconv_utf8) != 0) { 817 /* Ignore the error, and fallback to the path 818 * name from the main field. */ 819#ifdef DEBUG 820 fprintf(stderr, "Failed to read the ZIP " 821 "0x7075 extra field path.\n"); 822#endif 823 } 824 break; 825 } 826 case 0x7855: 827 /* Info-ZIP Unix Extra Field (type 2) "Ux". */ 828#ifdef DEBUG 829 fprintf(stderr, "uid %d gid %d\n", 830 archive_le16dec(p + offset), 831 archive_le16dec(p + offset + 2)); 832#endif 833 if (datasize >= 2) 834 zip_entry->uid = archive_le16dec(p + offset); 835 if (datasize >= 4) 836 zip_entry->gid = 837 archive_le16dec(p + offset + 2); 838 break; 839 case 0x7875: 840 { 841 /* Info-Zip Unix Extra Field (type 3) "ux". */ 842 int uidsize = 0, gidsize = 0; 843 844 /* TODO: support arbitrary uidsize/gidsize. */ 845 if (datasize >= 1 && p[offset] == 1) {/* version=1 */ 846 if (datasize >= 4) { 847 /* get a uid size. */ 848 uidsize = 0xff & (int)p[offset+1]; 849 if (uidsize == 2) 850 zip_entry->uid = 851 archive_le16dec( 852 p + offset + 2); 853 else if (uidsize == 4 && datasize >= 6) 854 zip_entry->uid = 855 archive_le32dec( 856 p + offset + 2); 857 } 858 if (datasize >= (2 + uidsize + 3)) { 859 /* get a gid size. */ 860 gidsize = 0xff & 861 (int)p[offset+2+uidsize]; 862 if (gidsize == 2) 863 zip_entry->gid = 864 archive_le16dec( 865 p+offset+2+uidsize+1); 866 else if (gidsize == 4 && 867 datasize >= (2 + uidsize + 5)) 868 zip_entry->gid = 869 archive_le32dec( 870 p+offset+2+uidsize+1); 871 } 872 } 873 break; 874 } 875 case 0x9901: 876 /* WinZip AES extra data field. */ 877 if (datasize < 6) { 878 archive_set_error(&a->archive, 879 ARCHIVE_ERRNO_FILE_FORMAT, 880 "Incomplete AES field"); 881 return ARCHIVE_FAILED; 882 } 883 if (p[offset + 2] == 'A' && p[offset + 3] == 'E') { 884 /* Vendor version. */ 885 zip_entry->aes_extra.vendor = 886 archive_le16dec(p + offset); 887 /* AES encryption strength. */ 888 zip_entry->aes_extra.strength = p[offset + 4]; 889 /* Actual compression method. */ 890 zip_entry->aes_extra.compression = 891 p[offset + 5]; 892 } 893 break; 894 default: 895 break; 896 } 897 offset += datasize; 898 } 899 return ARCHIVE_OK; 900} 901 902#if HAVE_LZMA_H && HAVE_LIBLZMA 903/* 904 * Auxiliary function to uncompress data chunk from zipx archive 905 * (zip with lzma compression). 906 */ 907static int 908zipx_lzma_uncompress_buffer(const char *compressed_buffer, 909 size_t compressed_buffer_size, 910 char *uncompressed_buffer, 911 size_t uncompressed_buffer_size) 912{ 913 int status = ARCHIVE_FATAL; 914 // length of 'lzma properties data' in lzma compressed 915 // data segment (stream) inside zip archive 916 const size_t lzma_params_length = 5; 917 // offset of 'lzma properties data' from the beginning of lzma stream 918 const size_t lzma_params_offset = 4; 919 // end position of 'lzma properties data' in lzma stream 920 const size_t lzma_params_end = lzma_params_offset + lzma_params_length; 921 if (compressed_buffer == NULL || 922 compressed_buffer_size < lzma_params_end || 923 uncompressed_buffer == NULL) 924 return status; 925 926 // prepare header for lzma_alone_decoder to replace zipx header 927 // (see comments in 'zipx_lzma_alone_init' for justification) 928#pragma pack(push) 929#pragma pack(1) 930 struct _alone_header 931 { 932 uint8_t bytes[5]; // lzma_params_length 933 uint64_t uncompressed_size; 934 } alone_header; 935#pragma pack(pop) 936 // copy 'lzma properties data' blob 937 memcpy(&alone_header.bytes[0], compressed_buffer + lzma_params_offset, 938 lzma_params_length); 939 alone_header.uncompressed_size = UINT64_MAX; 940 941 // prepare new compressed buffer, see 'zipx_lzma_alone_init' for details 942 const size_t lzma_alone_buffer_size = 943 compressed_buffer_size - lzma_params_end + sizeof(alone_header); 944 unsigned char *lzma_alone_compressed_buffer = 945 (unsigned char*) malloc(lzma_alone_buffer_size); 946 if (lzma_alone_compressed_buffer == NULL) 947 return status; 948 // copy lzma_alone header into new buffer 949 memcpy(lzma_alone_compressed_buffer, (void*) &alone_header, 950 sizeof(alone_header)); 951 // copy compressed data into new buffer 952 memcpy(lzma_alone_compressed_buffer + sizeof(alone_header), 953 compressed_buffer + lzma_params_end, 954 compressed_buffer_size - lzma_params_end); 955 956 // create and fill in lzma_alone_decoder stream 957 lzma_stream stream = LZMA_STREAM_INIT; 958 lzma_ret ret = lzma_alone_decoder(&stream, UINT64_MAX); 959 if (ret == LZMA_OK) 960 { 961 stream.next_in = lzma_alone_compressed_buffer; 962 stream.avail_in = lzma_alone_buffer_size; 963 stream.total_in = 0; 964 stream.next_out = (unsigned char*)uncompressed_buffer; 965 stream.avail_out = uncompressed_buffer_size; 966 stream.total_out = 0; 967 ret = lzma_code(&stream, LZMA_RUN); 968 if (ret == LZMA_OK || ret == LZMA_STREAM_END) 969 status = ARCHIVE_OK; 970 } 971 lzma_end(&stream); 972 free(lzma_alone_compressed_buffer); 973 return status; 974} 975#endif 976 977/* 978 * Assumes file pointer is at beginning of local file header. 979 */ 980static int 981zip_read_local_file_header(struct archive_read *a, struct archive_entry *entry, 982 struct zip *zip) 983{ 984 const char *p; 985 const void *h; 986 const wchar_t *wp; 987 const char *cp; 988 size_t len, filename_length, extra_length; 989 struct archive_string_conv *sconv; 990 struct zip_entry *zip_entry = zip->entry; 991 struct zip_entry zip_entry_central_dir; 992 int ret = ARCHIVE_OK; 993 char version; 994 995 /* Save a copy of the original for consistency checks. */ 996 zip_entry_central_dir = *zip_entry; 997 998 zip->decompress_init = 0; 999 zip->end_of_entry = 0; 1000 zip->entry_uncompressed_bytes_read = 0; 1001 zip->entry_compressed_bytes_read = 0; 1002 zip->entry_crc32 = zip->crc32func(0, NULL, 0); 1003 1004 /* Setup default conversion. */ 1005 if (zip->sconv == NULL && !zip->init_default_conversion) { 1006 zip->sconv_default = 1007 archive_string_default_conversion_for_read(&(a->archive)); 1008 zip->init_default_conversion = 1; 1009 } 1010 1011 if ((p = __archive_read_ahead(a, 30, NULL)) == NULL) { 1012 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1013 "Truncated ZIP file header"); 1014 return (ARCHIVE_FATAL); 1015 } 1016 1017 if (memcmp(p, "PK\003\004", 4) != 0) { 1018 archive_set_error(&a->archive, -1, "Damaged Zip archive"); 1019 return ARCHIVE_FATAL; 1020 } 1021 version = p[4]; 1022 zip_entry->system = p[5]; 1023 zip_entry->zip_flags = archive_le16dec(p + 6); 1024 if (zip_entry->zip_flags & (ZIP_ENCRYPTED | ZIP_STRONG_ENCRYPTED)) { 1025 zip->has_encrypted_entries = 1; 1026 archive_entry_set_is_data_encrypted(entry, 1); 1027 if (zip_entry->zip_flags & ZIP_CENTRAL_DIRECTORY_ENCRYPTED && 1028 zip_entry->zip_flags & ZIP_ENCRYPTED && 1029 zip_entry->zip_flags & ZIP_STRONG_ENCRYPTED) { 1030 archive_entry_set_is_metadata_encrypted(entry, 1); 1031 return ARCHIVE_FATAL; 1032 } 1033 } 1034 zip->init_decryption = (zip_entry->zip_flags & ZIP_ENCRYPTED); 1035 zip_entry->compression = (char)archive_le16dec(p + 8); 1036 zip_entry->mtime = zip_time(p + 10); 1037 zip_entry->crc32 = archive_le32dec(p + 14); 1038 if (zip_entry->zip_flags & ZIP_LENGTH_AT_END) 1039 zip_entry->decdat = p[11]; 1040 else 1041 zip_entry->decdat = p[17]; 1042 zip_entry->compressed_size = archive_le32dec(p + 18); 1043 zip_entry->uncompressed_size = archive_le32dec(p + 22); 1044 filename_length = archive_le16dec(p + 26); 1045 extra_length = archive_le16dec(p + 28); 1046 1047 __archive_read_consume(a, 30); 1048 1049 /* Read the filename. */ 1050 if ((h = __archive_read_ahead(a, filename_length, NULL)) == NULL) { 1051 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1052 "Truncated ZIP file header"); 1053 return (ARCHIVE_FATAL); 1054 } 1055 if (zip_entry->zip_flags & ZIP_UTF8_NAME) { 1056 /* The filename is stored to be UTF-8. */ 1057 if (zip->sconv_utf8 == NULL) { 1058 zip->sconv_utf8 = 1059 archive_string_conversion_from_charset( 1060 &a->archive, "UTF-8", 1); 1061 if (zip->sconv_utf8 == NULL) 1062 return (ARCHIVE_FATAL); 1063 } 1064 sconv = zip->sconv_utf8; 1065 } else if (zip->sconv != NULL) 1066 sconv = zip->sconv; 1067 else 1068 sconv = zip->sconv_default; 1069 1070 if (archive_entry_copy_pathname_l(entry, 1071 h, filename_length, sconv) != 0) { 1072 if (errno == ENOMEM) { 1073 archive_set_error(&a->archive, ENOMEM, 1074 "Can't allocate memory for Pathname"); 1075 return (ARCHIVE_FATAL); 1076 } 1077 archive_set_error(&a->archive, 1078 ARCHIVE_ERRNO_FILE_FORMAT, 1079 "Pathname cannot be converted " 1080 "from %s to current locale.", 1081 archive_string_conversion_charset_name(sconv)); 1082 ret = ARCHIVE_WARN; 1083 } 1084 __archive_read_consume(a, filename_length); 1085 1086 /* Read the extra data. */ 1087 if ((h = __archive_read_ahead(a, extra_length, NULL)) == NULL) { 1088 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1089 "Truncated ZIP file header"); 1090 return (ARCHIVE_FATAL); 1091 } 1092 1093 if (ARCHIVE_OK != process_extra(a, entry, h, extra_length, 1094 zip_entry)) { 1095 return ARCHIVE_FATAL; 1096 } 1097 __archive_read_consume(a, extra_length); 1098 1099 /* Work around a bug in Info-Zip: When reading from a pipe, it 1100 * stats the pipe instead of synthesizing a file entry. */ 1101 if ((zip_entry->mode & AE_IFMT) == AE_IFIFO) { 1102 zip_entry->mode &= ~ AE_IFMT; 1103 zip_entry->mode |= AE_IFREG; 1104 } 1105 1106 /* If the mode is totally empty, set some sane default. */ 1107 if (zip_entry->mode == 0) { 1108 zip_entry->mode |= 0664; 1109 } 1110 1111 /* Windows archivers sometimes use backslash as the directory 1112 * separator. Normalize to slash. */ 1113 if (zip_entry->system == 0 && 1114 (wp = archive_entry_pathname_w(entry)) != NULL) { 1115 if (wcschr(wp, L'/') == NULL && wcschr(wp, L'\\') != NULL) { 1116 size_t i; 1117 struct archive_wstring s; 1118 archive_string_init(&s); 1119 archive_wstrcpy(&s, wp); 1120 for (i = 0; i < archive_strlen(&s); i++) { 1121 if (s.s[i] == '\\') 1122 s.s[i] = '/'; 1123 } 1124 archive_entry_copy_pathname_w(entry, s.s); 1125 archive_wstring_free(&s); 1126 } 1127 } 1128 1129 /* Make sure that entries with a trailing '/' are marked as directories 1130 * even if the External File Attributes contains bogus values. If this 1131 * is not a directory and there is no type, assume a regular file. */ 1132 if ((zip_entry->mode & AE_IFMT) != AE_IFDIR) { 1133 int has_slash; 1134 1135 wp = archive_entry_pathname_w(entry); 1136 if (wp != NULL) { 1137 len = wcslen(wp); 1138 has_slash = len > 0 && wp[len - 1] == L'/'; 1139 } else { 1140 cp = archive_entry_pathname(entry); 1141 len = (cp != NULL)?strlen(cp):0; 1142 has_slash = len > 0 && cp[len - 1] == '/'; 1143 } 1144 /* Correct file type as needed. */ 1145 if (has_slash) { 1146 zip_entry->mode &= ~AE_IFMT; 1147 zip_entry->mode |= AE_IFDIR; 1148 zip_entry->mode |= 0111; 1149 } else if ((zip_entry->mode & AE_IFMT) == 0) { 1150 zip_entry->mode |= AE_IFREG; 1151 } 1152 } 1153 1154 /* Make sure directories end in '/' */ 1155 if ((zip_entry->mode & AE_IFMT) == AE_IFDIR) { 1156 wp = archive_entry_pathname_w(entry); 1157 if (wp != NULL) { 1158 len = wcslen(wp); 1159 if (len > 0 && wp[len - 1] != L'/') { 1160 struct archive_wstring s; 1161 archive_string_init(&s); 1162 archive_wstrcat(&s, wp); 1163 archive_wstrappend_wchar(&s, L'/'); 1164 archive_entry_copy_pathname_w(entry, s.s); 1165 archive_wstring_free(&s); 1166 } 1167 } else { 1168 cp = archive_entry_pathname(entry); 1169 len = (cp != NULL)?strlen(cp):0; 1170 if (len > 0 && cp[len - 1] != '/') { 1171 struct archive_string s; 1172 archive_string_init(&s); 1173 archive_strcat(&s, cp); 1174 archive_strappend_char(&s, '/'); 1175 archive_entry_set_pathname(entry, s.s); 1176 archive_string_free(&s); 1177 } 1178 } 1179 } 1180 1181 if (zip_entry->flags & LA_FROM_CENTRAL_DIRECTORY) { 1182 /* If this came from the central dir, its size info 1183 * is definitive, so ignore the length-at-end flag. */ 1184 zip_entry->zip_flags &= ~ZIP_LENGTH_AT_END; 1185 /* If local header is missing a value, use the one from 1186 the central directory. If both have it, warn about 1187 mismatches. */ 1188 if (zip_entry->crc32 == 0) { 1189 zip_entry->crc32 = zip_entry_central_dir.crc32; 1190 } else if (!zip->ignore_crc32 1191 && zip_entry->crc32 != zip_entry_central_dir.crc32) { 1192 archive_set_error(&a->archive, 1193 ARCHIVE_ERRNO_FILE_FORMAT, 1194 "Inconsistent CRC32 values"); 1195 ret = ARCHIVE_WARN; 1196 } 1197 if (zip_entry->compressed_size == 0) { 1198 zip_entry->compressed_size 1199 = zip_entry_central_dir.compressed_size; 1200 } else if (zip_entry->compressed_size 1201 != zip_entry_central_dir.compressed_size) { 1202 archive_set_error(&a->archive, 1203 ARCHIVE_ERRNO_FILE_FORMAT, 1204 "Inconsistent compressed size: " 1205 "%jd in central directory, %jd in local header", 1206 (intmax_t)zip_entry_central_dir.compressed_size, 1207 (intmax_t)zip_entry->compressed_size); 1208 ret = ARCHIVE_WARN; 1209 } 1210 if (zip_entry->uncompressed_size == 0) { 1211 zip_entry->uncompressed_size 1212 = zip_entry_central_dir.uncompressed_size; 1213 } else if (zip_entry->uncompressed_size 1214 != zip_entry_central_dir.uncompressed_size) { 1215 archive_set_error(&a->archive, 1216 ARCHIVE_ERRNO_FILE_FORMAT, 1217 "Inconsistent uncompressed size: " 1218 "%jd in central directory, %jd in local header", 1219 (intmax_t)zip_entry_central_dir.uncompressed_size, 1220 (intmax_t)zip_entry->uncompressed_size); 1221 ret = ARCHIVE_WARN; 1222 } 1223 } 1224 1225 /* Populate some additional entry fields: */ 1226 archive_entry_set_mode(entry, zip_entry->mode); 1227 archive_entry_set_uid(entry, zip_entry->uid); 1228 archive_entry_set_gid(entry, zip_entry->gid); 1229 archive_entry_set_mtime(entry, zip_entry->mtime, 0); 1230 archive_entry_set_ctime(entry, zip_entry->ctime, 0); 1231 archive_entry_set_atime(entry, zip_entry->atime, 0); 1232 1233 if ((zip->entry->mode & AE_IFMT) == AE_IFLNK) { 1234 size_t linkname_length; 1235 1236 if (zip_entry->compressed_size > 64 * 1024) { 1237 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1238 "Zip file with oversized link entry"); 1239 return ARCHIVE_FATAL; 1240 } 1241 1242 linkname_length = (size_t)zip_entry->compressed_size; 1243 1244 archive_entry_set_size(entry, 0); 1245 p = __archive_read_ahead(a, linkname_length, NULL); 1246 if (p == NULL) { 1247 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1248 "Truncated Zip file"); 1249 return ARCHIVE_FATAL; 1250 } 1251 // take into account link compression if any 1252 size_t linkname_full_length = linkname_length; 1253 if (zip->entry->compression != 0) 1254 { 1255 // symlink target string appeared to be compressed 1256 int status = ARCHIVE_FATAL; 1257 char *uncompressed_buffer = 1258 (char*) malloc(zip_entry->uncompressed_size); 1259 if (uncompressed_buffer == NULL) 1260 { 1261 archive_set_error(&a->archive, ENOMEM, 1262 "No memory for lzma decompression"); 1263 return status; 1264 } 1265 1266 switch (zip->entry->compression) 1267 { 1268#if HAVE_LZMA_H && HAVE_LIBLZMA 1269 case 14: /* ZIPx LZMA compression. */ 1270 /*(see zip file format specification, section 4.4.5)*/ 1271 status = zipx_lzma_uncompress_buffer(p, 1272 linkname_length, 1273 uncompressed_buffer, 1274 (size_t)zip_entry->uncompressed_size); 1275 break; 1276#endif 1277 default: /* Unsupported compression. */ 1278 break; 1279 } 1280 if (status == ARCHIVE_OK) 1281 { 1282 p = uncompressed_buffer; 1283 linkname_full_length = 1284 (size_t)zip_entry->uncompressed_size; 1285 } 1286 else 1287 { 1288 archive_set_error(&a->archive, 1289 ARCHIVE_ERRNO_FILE_FORMAT, 1290 "Unsupported ZIP compression method " 1291 "during decompression of link entry (%d: %s)", 1292 zip->entry->compression, 1293 compression_name(zip->entry->compression)); 1294 return ARCHIVE_FAILED; 1295 } 1296 } 1297 1298 sconv = zip->sconv; 1299 if (sconv == NULL && (zip->entry->zip_flags & ZIP_UTF8_NAME)) 1300 sconv = zip->sconv_utf8; 1301 if (sconv == NULL) 1302 sconv = zip->sconv_default; 1303 if (archive_entry_copy_symlink_l(entry, p, linkname_full_length, 1304 sconv) != 0) { 1305 if (errno != ENOMEM && sconv == zip->sconv_utf8 && 1306 (zip->entry->zip_flags & ZIP_UTF8_NAME)) 1307 archive_entry_copy_symlink_l(entry, p, 1308 linkname_full_length, NULL); 1309 if (errno == ENOMEM) { 1310 archive_set_error(&a->archive, ENOMEM, 1311 "Can't allocate memory for Symlink"); 1312 return (ARCHIVE_FATAL); 1313 } 1314 /* 1315 * Since there is no character-set regulation for 1316 * symlink name, do not report the conversion error 1317 * in an automatic conversion. 1318 */ 1319 if (sconv != zip->sconv_utf8 || 1320 (zip->entry->zip_flags & ZIP_UTF8_NAME) == 0) { 1321 archive_set_error(&a->archive, 1322 ARCHIVE_ERRNO_FILE_FORMAT, 1323 "Symlink cannot be converted " 1324 "from %s to current locale.", 1325 archive_string_conversion_charset_name( 1326 sconv)); 1327 ret = ARCHIVE_WARN; 1328 } 1329 } 1330 zip_entry->uncompressed_size = zip_entry->compressed_size = 0; 1331 1332 if (__archive_read_consume(a, linkname_length) < 0) { 1333 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1334 "Read error skipping symlink target name"); 1335 return ARCHIVE_FATAL; 1336 } 1337 } else if (0 == (zip_entry->zip_flags & ZIP_LENGTH_AT_END) 1338 || zip_entry->uncompressed_size > 0) { 1339 /* Set the size only if it's meaningful. */ 1340 archive_entry_set_size(entry, zip_entry->uncompressed_size); 1341 } 1342 zip->entry_bytes_remaining = zip_entry->compressed_size; 1343 1344 /* If there's no body, force read_data() to return EOF immediately. */ 1345 if (0 == (zip_entry->zip_flags & ZIP_LENGTH_AT_END) 1346 && zip->entry_bytes_remaining < 1) 1347 zip->end_of_entry = 1; 1348 1349 /* Set up a more descriptive format name. */ 1350 archive_string_empty(&zip->format_name); 1351 archive_string_sprintf(&zip->format_name, "ZIP %d.%d (%s)", 1352 version / 10, version % 10, 1353 compression_name(zip->entry->compression)); 1354 a->archive.archive_format_name = zip->format_name.s; 1355 1356 return (ret); 1357} 1358 1359static int 1360check_authentication_code(struct archive_read *a, const void *_p) 1361{ 1362 struct zip *zip = (struct zip *)(a->format->data); 1363 1364 /* Check authentication code. */ 1365 if (zip->hctx_valid) { 1366 const void *p; 1367 uint8_t hmac[20]; 1368 size_t hmac_len = 20; 1369 int cmp; 1370 1371 archive_hmac_sha1_final(&zip->hctx, hmac, &hmac_len); 1372 if (_p == NULL) { 1373 /* Read authentication code. */ 1374 p = __archive_read_ahead(a, AUTH_CODE_SIZE, NULL); 1375 if (p == NULL) { 1376 archive_set_error(&a->archive, 1377 ARCHIVE_ERRNO_FILE_FORMAT, 1378 "Truncated ZIP file data"); 1379 return (ARCHIVE_FATAL); 1380 } 1381 } else { 1382 p = _p; 1383 } 1384 cmp = memcmp(hmac, p, AUTH_CODE_SIZE); 1385 __archive_read_consume(a, AUTH_CODE_SIZE); 1386 if (cmp != 0) { 1387 archive_set_error(&a->archive, 1388 ARCHIVE_ERRNO_MISC, 1389 "ZIP bad Authentication code"); 1390 return (ARCHIVE_WARN); 1391 } 1392 } 1393 return (ARCHIVE_OK); 1394} 1395 1396/* 1397 * Read "uncompressed" data. There are three cases: 1398 * 1) We know the size of the data. This is always true for the 1399 * seeking reader (we've examined the Central Directory already). 1400 * 2) ZIP_LENGTH_AT_END was set, but only the CRC was deferred. 1401 * Info-ZIP seems to do this; we know the size but have to grab 1402 * the CRC from the data descriptor afterwards. 1403 * 3) We're streaming and ZIP_LENGTH_AT_END was specified and 1404 * we have no size information. In this case, we can do pretty 1405 * well by watching for the data descriptor record. The data 1406 * descriptor is 16 bytes and includes a computed CRC that should 1407 * provide a strong check. 1408 * 1409 * TODO: Technically, the PK\007\010 signature is optional. 1410 * In the original spec, the data descriptor contained CRC 1411 * and size fields but had no leading signature. In practice, 1412 * newer writers seem to provide the signature pretty consistently. 1413 * 1414 * For uncompressed data, the PK\007\010 marker seems essential 1415 * to be sure we've actually seen the end of the entry. 1416 * 1417 * Returns ARCHIVE_OK if successful, ARCHIVE_FATAL otherwise, sets 1418 * zip->end_of_entry if it consumes all of the data. 1419 */ 1420static int 1421zip_read_data_none(struct archive_read *a, const void **_buff, 1422 size_t *size, int64_t *offset) 1423{ 1424 struct zip *zip; 1425 const char *buff; 1426 ssize_t bytes_avail; 1427 int r; 1428 1429 (void)offset; /* UNUSED */ 1430 1431 zip = (struct zip *)(a->format->data); 1432 1433 if (zip->entry->zip_flags & ZIP_LENGTH_AT_END) { 1434 const char *p; 1435 ssize_t grabbing_bytes = 24; 1436 1437 if (zip->hctx_valid) 1438 grabbing_bytes += AUTH_CODE_SIZE; 1439 /* Grab at least 24 bytes. */ 1440 buff = __archive_read_ahead(a, grabbing_bytes, &bytes_avail); 1441 if (bytes_avail < grabbing_bytes) { 1442 /* Zip archives have end-of-archive markers 1443 that are longer than this, so a failure to get at 1444 least 24 bytes really does indicate a truncated 1445 file. */ 1446 archive_set_error(&a->archive, 1447 ARCHIVE_ERRNO_FILE_FORMAT, 1448 "Truncated ZIP file data"); 1449 return (ARCHIVE_FATAL); 1450 } 1451 /* Check for a complete PK\007\010 signature, followed 1452 * by the correct 4-byte CRC. */ 1453 p = buff; 1454 if (zip->hctx_valid) 1455 p += AUTH_CODE_SIZE; 1456 if (p[0] == 'P' && p[1] == 'K' 1457 && p[2] == '\007' && p[3] == '\010' 1458 && (archive_le32dec(p + 4) == zip->entry_crc32 1459 || zip->ignore_crc32 1460 || (zip->hctx_valid 1461 && zip->entry->aes_extra.vendor == AES_VENDOR_AE_2))) { 1462 if (zip->entry->flags & LA_USED_ZIP64) { 1463 uint64_t compressed, uncompressed; 1464 zip->entry->crc32 = archive_le32dec(p + 4); 1465 compressed = archive_le64dec(p + 8); 1466 uncompressed = archive_le64dec(p + 16); 1467 if (compressed > INT64_MAX || uncompressed > 1468 INT64_MAX) { 1469 archive_set_error(&a->archive, 1470 ARCHIVE_ERRNO_FILE_FORMAT, 1471 "Overflow of 64-bit file sizes"); 1472 return ARCHIVE_FAILED; 1473 } 1474 zip->entry->compressed_size = compressed; 1475 zip->entry->uncompressed_size = uncompressed; 1476 zip->unconsumed = 24; 1477 } else { 1478 zip->entry->crc32 = archive_le32dec(p + 4); 1479 zip->entry->compressed_size = 1480 archive_le32dec(p + 8); 1481 zip->entry->uncompressed_size = 1482 archive_le32dec(p + 12); 1483 zip->unconsumed = 16; 1484 } 1485 if (zip->hctx_valid) { 1486 r = check_authentication_code(a, buff); 1487 if (r != ARCHIVE_OK) 1488 return (r); 1489 } 1490 zip->end_of_entry = 1; 1491 return (ARCHIVE_OK); 1492 } 1493 /* If not at EOF, ensure we consume at least one byte. */ 1494 ++p; 1495 1496 /* Scan forward until we see where a PK\007\010 signature 1497 * might be. */ 1498 /* Return bytes up until that point. On the next call, 1499 * the code above will verify the data descriptor. */ 1500 while (p < buff + bytes_avail - 4) { 1501 if (p[3] == 'P') { p += 3; } 1502 else if (p[3] == 'K') { p += 2; } 1503 else if (p[3] == '\007') { p += 1; } 1504 else if (p[3] == '\010' && p[2] == '\007' 1505 && p[1] == 'K' && p[0] == 'P') { 1506 if (zip->hctx_valid) 1507 p -= AUTH_CODE_SIZE; 1508 break; 1509 } else { p += 4; } 1510 } 1511 bytes_avail = p - buff; 1512 } else { 1513 if (zip->entry_bytes_remaining == 0) { 1514 zip->end_of_entry = 1; 1515 if (zip->hctx_valid) { 1516 r = check_authentication_code(a, NULL); 1517 if (r != ARCHIVE_OK) 1518 return (r); 1519 } 1520 return (ARCHIVE_OK); 1521 } 1522 /* Grab a bunch of bytes. */ 1523 buff = __archive_read_ahead(a, 1, &bytes_avail); 1524 if (bytes_avail <= 0) { 1525 archive_set_error(&a->archive, 1526 ARCHIVE_ERRNO_FILE_FORMAT, 1527 "Truncated ZIP file data"); 1528 return (ARCHIVE_FATAL); 1529 } 1530 if (bytes_avail > zip->entry_bytes_remaining) 1531 bytes_avail = (ssize_t)zip->entry_bytes_remaining; 1532 } 1533 if (zip->tctx_valid || zip->cctx_valid) { 1534 size_t dec_size = bytes_avail; 1535 1536 if (dec_size > zip->decrypted_buffer_size) 1537 dec_size = zip->decrypted_buffer_size; 1538 if (zip->tctx_valid) { 1539 trad_enc_decrypt_update(&zip->tctx, 1540 (const uint8_t *)buff, dec_size, 1541 zip->decrypted_buffer, dec_size); 1542 } else { 1543 size_t dsize = dec_size; 1544 archive_hmac_sha1_update(&zip->hctx, 1545 (const uint8_t *)buff, dec_size); 1546 archive_decrypto_aes_ctr_update(&zip->cctx, 1547 (const uint8_t *)buff, dec_size, 1548 zip->decrypted_buffer, &dsize); 1549 } 1550 bytes_avail = dec_size; 1551 buff = (const char *)zip->decrypted_buffer; 1552 } 1553 *size = bytes_avail; 1554 zip->entry_bytes_remaining -= bytes_avail; 1555 zip->entry_uncompressed_bytes_read += bytes_avail; 1556 zip->entry_compressed_bytes_read += bytes_avail; 1557 zip->unconsumed += bytes_avail; 1558 *_buff = buff; 1559 return (ARCHIVE_OK); 1560} 1561 1562static int 1563consume_optional_marker(struct archive_read *a, struct zip *zip) 1564{ 1565 if (zip->end_of_entry && (zip->entry->zip_flags & ZIP_LENGTH_AT_END)) { 1566 const char *p; 1567 1568 if (NULL == (p = __archive_read_ahead(a, 24, NULL))) { 1569 archive_set_error(&a->archive, 1570 ARCHIVE_ERRNO_FILE_FORMAT, 1571 "Truncated ZIP end-of-file record"); 1572 return (ARCHIVE_FATAL); 1573 } 1574 /* Consume the optional PK\007\010 marker. */ 1575 if (p[0] == 'P' && p[1] == 'K' && 1576 p[2] == '\007' && p[3] == '\010') { 1577 p += 4; 1578 zip->unconsumed = 4; 1579 } 1580 if (zip->entry->flags & LA_USED_ZIP64) { 1581 uint64_t compressed, uncompressed; 1582 zip->entry->crc32 = archive_le32dec(p); 1583 compressed = archive_le64dec(p + 4); 1584 uncompressed = archive_le64dec(p + 12); 1585 if (compressed > INT64_MAX || 1586 uncompressed > INT64_MAX) { 1587 archive_set_error(&a->archive, 1588 ARCHIVE_ERRNO_FILE_FORMAT, 1589 "Overflow of 64-bit file sizes"); 1590 return ARCHIVE_FAILED; 1591 } 1592 zip->entry->compressed_size = compressed; 1593 zip->entry->uncompressed_size = uncompressed; 1594 zip->unconsumed += 20; 1595 } else { 1596 zip->entry->crc32 = archive_le32dec(p); 1597 zip->entry->compressed_size = archive_le32dec(p + 4); 1598 zip->entry->uncompressed_size = archive_le32dec(p + 8); 1599 zip->unconsumed += 12; 1600 } 1601 } 1602 1603 return (ARCHIVE_OK); 1604} 1605 1606#if HAVE_LZMA_H && HAVE_LIBLZMA 1607static int 1608zipx_xz_init(struct archive_read *a, struct zip *zip) 1609{ 1610 lzma_ret r; 1611 1612 if(zip->zipx_lzma_valid) { 1613 lzma_end(&zip->zipx_lzma_stream); 1614 zip->zipx_lzma_valid = 0; 1615 } 1616 1617 memset(&zip->zipx_lzma_stream, 0, sizeof(zip->zipx_lzma_stream)); 1618 r = lzma_stream_decoder(&zip->zipx_lzma_stream, UINT64_MAX, 0); 1619 if (r != LZMA_OK) { 1620 archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC, 1621 "xz initialization failed(%d)", 1622 r); 1623 1624 return (ARCHIVE_FAILED); 1625 } 1626 1627 zip->zipx_lzma_valid = 1; 1628 1629 free(zip->uncompressed_buffer); 1630 1631 zip->uncompressed_buffer_size = 256 * 1024; 1632 zip->uncompressed_buffer = 1633 (uint8_t*) malloc(zip->uncompressed_buffer_size); 1634 if (zip->uncompressed_buffer == NULL) { 1635 archive_set_error(&a->archive, ENOMEM, 1636 "No memory for xz decompression"); 1637 return (ARCHIVE_FATAL); 1638 } 1639 1640 zip->decompress_init = 1; 1641 return (ARCHIVE_OK); 1642} 1643 1644static int 1645zipx_lzma_alone_init(struct archive_read *a, struct zip *zip) 1646{ 1647 lzma_ret r; 1648 const uint8_t* p; 1649 1650#pragma pack(push) 1651#pragma pack(1) 1652 struct _alone_header { 1653 uint8_t bytes[5]; 1654 uint64_t uncompressed_size; 1655 } alone_header; 1656#pragma pack(pop) 1657 1658 if(zip->zipx_lzma_valid) { 1659 lzma_end(&zip->zipx_lzma_stream); 1660 zip->zipx_lzma_valid = 0; 1661 } 1662 1663 /* To unpack ZIPX's "LZMA" (id 14) stream we can use standard liblzma 1664 * that is a part of XZ Utils. The stream format stored inside ZIPX 1665 * file is a modified "lzma alone" file format, that was used by the 1666 * `lzma` utility which was later deprecated in favour of `xz` utility. * Since those formats are nearly the same, we can use a standard 1667 * "lzma alone" decoder from XZ Utils. */ 1668 1669 memset(&zip->zipx_lzma_stream, 0, sizeof(zip->zipx_lzma_stream)); 1670 r = lzma_alone_decoder(&zip->zipx_lzma_stream, UINT64_MAX); 1671 if (r != LZMA_OK) { 1672 archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC, 1673 "lzma initialization failed(%d)", r); 1674 1675 return (ARCHIVE_FAILED); 1676 } 1677 1678 /* Flag the cleanup function that we want our lzma-related structures 1679 * to be freed later. */ 1680 zip->zipx_lzma_valid = 1; 1681 1682 /* The "lzma alone" file format and the stream format inside ZIPx are 1683 * almost the same. Here's an example of a structure of "lzma alone" 1684 * format: 1685 * 1686 * $ cat /bin/ls | lzma | xxd | head -n 1 1687 * 00000000: 5d00 0080 00ff ffff ffff ffff ff00 2814 1688 * 1689 * 5 bytes 8 bytes n bytes 1690 * <lzma_params><uncompressed_size><data...> 1691 * 1692 * lzma_params is a 5-byte blob that has to be decoded to extract 1693 * parameters of this LZMA stream. The uncompressed_size field is an 1694 * uint64_t value that contains information about the size of the 1695 * uncompressed file, or UINT64_MAX if this value is unknown. 1696 * The <data...> part is the actual lzma-compressed data stream. 1697 * 1698 * Now here's the structure of the stream inside the ZIPX file: 1699 * 1700 * $ cat stream_inside_zipx | xxd | head -n 1 1701 * 00000000: 0914 0500 5d00 8000 0000 2814 .... .... 1702 * 1703 * 2byte 2byte 5 bytes n bytes 1704 * <magic1><magic2><lzma_params><data...> 1705 * 1706 * This means that the ZIPX file contains an additional magic1 and 1707 * magic2 headers, the lzma_params field contains the same parameter 1708 * set as in the "lzma alone" format, and the <data...> field is the 1709 * same as in the "lzma alone" format as well. Note that also the zipx 1710 * format is missing the uncompressed_size field. 1711 * 1712 * So, in order to use the "lzma alone" decoder for the zipx lzma 1713 * stream, we simply need to shuffle around some fields, prepare a new 1714 * lzma alone header, feed it into lzma alone decoder so it will 1715 * initialize itself properly, and then we can start feeding normal 1716 * zipx lzma stream into the decoder. 1717 */ 1718 1719 /* Read magic1,magic2,lzma_params from the ZIPX stream. */ 1720 if((p = __archive_read_ahead(a, 9, NULL)) == NULL) { 1721 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1722 "Truncated lzma data"); 1723 return (ARCHIVE_FATAL); 1724 } 1725 1726 if(p[2] != 0x05 || p[3] != 0x00) { 1727 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1728 "Invalid lzma data"); 1729 return (ARCHIVE_FATAL); 1730 } 1731 1732 /* Prepare an lzma alone header: copy the lzma_params blob into 1733 * a proper place into the lzma alone header. */ 1734 memcpy(&alone_header.bytes[0], p + 4, 5); 1735 1736 /* Initialize the 'uncompressed size' field to unknown; we'll manually 1737 * monitor how many bytes there are still to be uncompressed. */ 1738 alone_header.uncompressed_size = UINT64_MAX; 1739 1740 if(!zip->uncompressed_buffer) { 1741 zip->uncompressed_buffer_size = 256 * 1024; 1742 zip->uncompressed_buffer = 1743 (uint8_t*) malloc(zip->uncompressed_buffer_size); 1744 1745 if (zip->uncompressed_buffer == NULL) { 1746 archive_set_error(&a->archive, ENOMEM, 1747 "No memory for lzma decompression"); 1748 return (ARCHIVE_FATAL); 1749 } 1750 } 1751 1752 zip->zipx_lzma_stream.next_in = (void*) &alone_header; 1753 zip->zipx_lzma_stream.avail_in = sizeof(alone_header); 1754 zip->zipx_lzma_stream.total_in = 0; 1755 zip->zipx_lzma_stream.next_out = zip->uncompressed_buffer; 1756 zip->zipx_lzma_stream.avail_out = zip->uncompressed_buffer_size; 1757 zip->zipx_lzma_stream.total_out = 0; 1758 1759 /* Feed only the header into the lzma alone decoder. This will 1760 * effectively initialize the decoder, and will not produce any 1761 * output bytes yet. */ 1762 r = lzma_code(&zip->zipx_lzma_stream, LZMA_RUN); 1763 if (r != LZMA_OK) { 1764 archive_set_error(&a->archive, ARCHIVE_ERRNO_PROGRAMMER, 1765 "lzma stream initialization error"); 1766 return ARCHIVE_FATAL; 1767 } 1768 1769 /* We've already consumed some bytes, so take this into account. */ 1770 __archive_read_consume(a, 9); 1771 zip->entry_bytes_remaining -= 9; 1772 zip->entry_compressed_bytes_read += 9; 1773 1774 zip->decompress_init = 1; 1775 return (ARCHIVE_OK); 1776} 1777 1778static int 1779zip_read_data_zipx_xz(struct archive_read *a, const void **buff, 1780 size_t *size, int64_t *offset) 1781{ 1782 struct zip* zip = (struct zip *)(a->format->data); 1783 int ret; 1784 lzma_ret lz_ret; 1785 const void* compressed_buf; 1786 ssize_t bytes_avail, in_bytes, to_consume = 0; 1787 1788 (void) offset; /* UNUSED */ 1789 1790 /* Initialize decompressor if not yet initialized. */ 1791 if (!zip->decompress_init) { 1792 ret = zipx_xz_init(a, zip); 1793 if (ret != ARCHIVE_OK) 1794 return (ret); 1795 } 1796 1797 compressed_buf = __archive_read_ahead(a, 1, &bytes_avail); 1798 if (bytes_avail < 0) { 1799 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1800 "Truncated xz file body"); 1801 return (ARCHIVE_FATAL); 1802 } 1803 1804 in_bytes = zipmin(zip->entry_bytes_remaining, bytes_avail); 1805 zip->zipx_lzma_stream.next_in = compressed_buf; 1806 zip->zipx_lzma_stream.avail_in = in_bytes; 1807 zip->zipx_lzma_stream.total_in = 0; 1808 zip->zipx_lzma_stream.next_out = zip->uncompressed_buffer; 1809 zip->zipx_lzma_stream.avail_out = zip->uncompressed_buffer_size; 1810 zip->zipx_lzma_stream.total_out = 0; 1811 1812 /* Perform the decompression. */ 1813 lz_ret = lzma_code(&zip->zipx_lzma_stream, LZMA_RUN); 1814 switch(lz_ret) { 1815 case LZMA_DATA_ERROR: 1816 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1817 "xz data error (error %d)", (int) lz_ret); 1818 return (ARCHIVE_FATAL); 1819 1820 case LZMA_NO_CHECK: 1821 case LZMA_OK: 1822 break; 1823 1824 default: 1825 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1826 "xz unknown error %d", (int) lz_ret); 1827 return (ARCHIVE_FATAL); 1828 1829 case LZMA_STREAM_END: 1830 lzma_end(&zip->zipx_lzma_stream); 1831 zip->zipx_lzma_valid = 0; 1832 1833 if((int64_t) zip->zipx_lzma_stream.total_in != 1834 zip->entry_bytes_remaining) 1835 { 1836 archive_set_error(&a->archive, 1837 ARCHIVE_ERRNO_MISC, 1838 "xz premature end of stream"); 1839 return (ARCHIVE_FATAL); 1840 } 1841 1842 zip->end_of_entry = 1; 1843 break; 1844 } 1845 1846 to_consume = zip->zipx_lzma_stream.total_in; 1847 1848 __archive_read_consume(a, to_consume); 1849 zip->entry_bytes_remaining -= to_consume; 1850 zip->entry_compressed_bytes_read += to_consume; 1851 zip->entry_uncompressed_bytes_read += zip->zipx_lzma_stream.total_out; 1852 1853 *size = zip->zipx_lzma_stream.total_out; 1854 *buff = zip->uncompressed_buffer; 1855 1856 ret = consume_optional_marker(a, zip); 1857 if (ret != ARCHIVE_OK) 1858 return (ret); 1859 1860 return (ARCHIVE_OK); 1861} 1862 1863static int 1864zip_read_data_zipx_lzma_alone(struct archive_read *a, const void **buff, 1865 size_t *size, int64_t *offset) 1866{ 1867 struct zip* zip = (struct zip *)(a->format->data); 1868 int ret; 1869 lzma_ret lz_ret; 1870 const void* compressed_buf; 1871 ssize_t bytes_avail, in_bytes, to_consume; 1872 1873 (void) offset; /* UNUSED */ 1874 1875 /* Initialize decompressor if not yet initialized. */ 1876 if (!zip->decompress_init) { 1877 ret = zipx_lzma_alone_init(a, zip); 1878 if (ret != ARCHIVE_OK) 1879 return (ret); 1880 } 1881 1882 /* Fetch more compressed data. The same note as in deflate handler 1883 * applies here as well: 1884 * 1885 * Note: '1' here is a performance optimization. Recall that the 1886 * decompression layer returns a count of available bytes; asking for 1887 * more than that forces the decompressor to combine reads by copying 1888 * data. 1889 */ 1890 compressed_buf = __archive_read_ahead(a, 1, &bytes_avail); 1891 if (bytes_avail < 0) { 1892 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1893 "Truncated lzma file body"); 1894 return (ARCHIVE_FATAL); 1895 } 1896 1897 /* Set decompressor parameters. */ 1898 in_bytes = zipmin(zip->entry_bytes_remaining, bytes_avail); 1899 1900 zip->zipx_lzma_stream.next_in = compressed_buf; 1901 zip->zipx_lzma_stream.avail_in = in_bytes; 1902 zip->zipx_lzma_stream.total_in = 0; 1903 zip->zipx_lzma_stream.next_out = zip->uncompressed_buffer; 1904 zip->zipx_lzma_stream.avail_out = 1905 /* These lzma_alone streams lack end of stream marker, so let's 1906 * make sure the unpacker won't try to unpack more than it's 1907 * supposed to. */ 1908 zipmin((int64_t) zip->uncompressed_buffer_size, 1909 zip->entry->uncompressed_size - 1910 zip->entry_uncompressed_bytes_read); 1911 zip->zipx_lzma_stream.total_out = 0; 1912 1913 /* Perform the decompression. */ 1914 lz_ret = lzma_code(&zip->zipx_lzma_stream, LZMA_RUN); 1915 switch(lz_ret) { 1916 case LZMA_DATA_ERROR: 1917 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1918 "lzma data error (error %d)", (int) lz_ret); 1919 return (ARCHIVE_FATAL); 1920 1921 /* This case is optional in lzma alone format. It can happen, 1922 * but most of the files don't have it. (GitHub #1257) */ 1923 case LZMA_STREAM_END: 1924 lzma_end(&zip->zipx_lzma_stream); 1925 zip->zipx_lzma_valid = 0; 1926 if((int64_t) zip->zipx_lzma_stream.total_in != 1927 zip->entry_bytes_remaining) 1928 { 1929 archive_set_error(&a->archive, 1930 ARCHIVE_ERRNO_MISC, 1931 "lzma alone premature end of stream"); 1932 return (ARCHIVE_FATAL); 1933 } 1934 1935 zip->end_of_entry = 1; 1936 break; 1937 1938 case LZMA_OK: 1939 break; 1940 1941 default: 1942 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1943 "lzma unknown error %d", (int) lz_ret); 1944 return (ARCHIVE_FATAL); 1945 } 1946 1947 to_consume = zip->zipx_lzma_stream.total_in; 1948 1949 /* Update pointers. */ 1950 __archive_read_consume(a, to_consume); 1951 zip->entry_bytes_remaining -= to_consume; 1952 zip->entry_compressed_bytes_read += to_consume; 1953 zip->entry_uncompressed_bytes_read += zip->zipx_lzma_stream.total_out; 1954 1955 if(zip->entry_bytes_remaining == 0) { 1956 zip->end_of_entry = 1; 1957 } 1958 1959 /* Return values. */ 1960 *size = zip->zipx_lzma_stream.total_out; 1961 *buff = zip->uncompressed_buffer; 1962 1963 /* Behave the same way as during deflate decompression. */ 1964 ret = consume_optional_marker(a, zip); 1965 if (ret != ARCHIVE_OK) 1966 return (ret); 1967 1968 /* Free lzma decoder handle because we'll no longer need it. */ 1969 if(zip->end_of_entry) { 1970 lzma_end(&zip->zipx_lzma_stream); 1971 zip->zipx_lzma_valid = 0; 1972 } 1973 1974 /* If we're here, then we're good! */ 1975 return (ARCHIVE_OK); 1976} 1977#endif /* HAVE_LZMA_H && HAVE_LIBLZMA */ 1978 1979static int 1980zipx_ppmd8_init(struct archive_read *a, struct zip *zip) 1981{ 1982 const void* p; 1983 uint32_t val; 1984 uint32_t order; 1985 uint32_t mem; 1986 uint32_t restore_method; 1987 1988 /* Remove previous decompression context if it exists. */ 1989 if(zip->ppmd8_valid) { 1990 __archive_ppmd8_functions.Ppmd8_Free(&zip->ppmd8); 1991 zip->ppmd8_valid = 0; 1992 } 1993 1994 /* Create a new decompression context. */ 1995 __archive_ppmd8_functions.Ppmd8_Construct(&zip->ppmd8); 1996 zip->ppmd8_stream_failed = 0; 1997 1998 /* Setup function pointers required by Ppmd8 decompressor. The 1999 * 'ppmd_read' function will feed new bytes to the decompressor, 2000 * and will increment the 'zip->zipx_ppmd_read_compressed' counter. */ 2001 zip->ppmd8.Stream.In = &zip->zipx_ppmd_stream; 2002 zip->zipx_ppmd_stream.a = a; 2003 zip->zipx_ppmd_stream.Read = &ppmd_read; 2004 2005 /* Reset number of read bytes to 0. */ 2006 zip->zipx_ppmd_read_compressed = 0; 2007 2008 /* Read Ppmd8 header (2 bytes). */ 2009 p = __archive_read_ahead(a, 2, NULL); 2010 if(!p) { 2011 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2012 "Truncated file data in PPMd8 stream"); 2013 return (ARCHIVE_FATAL); 2014 } 2015 __archive_read_consume(a, 2); 2016 2017 /* Decode the stream's compression parameters. */ 2018 val = archive_le16dec(p); 2019 order = (val & 15) + 1; 2020 mem = ((val >> 4) & 0xff) + 1; 2021 restore_method = (val >> 12); 2022 2023 if(order < 2 || restore_method > 2) { 2024 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2025 "Invalid parameter set in PPMd8 stream (order=%" PRId32 ", " 2026 "restore=%" PRId32 ")", order, restore_method); 2027 return (ARCHIVE_FAILED); 2028 } 2029 2030 /* Allocate the memory needed to properly decompress the file. */ 2031 if(!__archive_ppmd8_functions.Ppmd8_Alloc(&zip->ppmd8, mem << 20)) { 2032 archive_set_error(&a->archive, ENOMEM, 2033 "Unable to allocate memory for PPMd8 stream: %" PRId32 " bytes", 2034 mem << 20); 2035 return (ARCHIVE_FATAL); 2036 } 2037 2038 /* Signal the cleanup function to release Ppmd8 context in the 2039 * cleanup phase. */ 2040 zip->ppmd8_valid = 1; 2041 2042 /* Perform further Ppmd8 initialization. */ 2043 if(!__archive_ppmd8_functions.Ppmd8_RangeDec_Init(&zip->ppmd8)) { 2044 archive_set_error(&a->archive, ARCHIVE_ERRNO_PROGRAMMER, 2045 "PPMd8 stream range decoder initialization error"); 2046 return (ARCHIVE_FATAL); 2047 } 2048 2049 __archive_ppmd8_functions.Ppmd8_Init(&zip->ppmd8, order, 2050 restore_method); 2051 2052 /* Allocate the buffer that will hold uncompressed data. */ 2053 free(zip->uncompressed_buffer); 2054 2055 zip->uncompressed_buffer_size = 256 * 1024; 2056 zip->uncompressed_buffer = 2057 (uint8_t*) malloc(zip->uncompressed_buffer_size); 2058 2059 if(zip->uncompressed_buffer == NULL) { 2060 archive_set_error(&a->archive, ENOMEM, 2061 "No memory for PPMd8 decompression"); 2062 return ARCHIVE_FATAL; 2063 } 2064 2065 /* Ppmd8 initialization is done. */ 2066 zip->decompress_init = 1; 2067 2068 /* We've already read 2 bytes in the output stream. Additionally, 2069 * Ppmd8 initialization code could read some data as well. So we 2070 * are advancing the stream by 2 bytes plus whatever number of 2071 * bytes Ppmd8 init function used. */ 2072 zip->entry_compressed_bytes_read += 2 + zip->zipx_ppmd_read_compressed; 2073 2074 return ARCHIVE_OK; 2075} 2076 2077static int 2078zip_read_data_zipx_ppmd(struct archive_read *a, const void **buff, 2079 size_t *size, int64_t *offset) 2080{ 2081 struct zip* zip = (struct zip *)(a->format->data); 2082 int ret; 2083 size_t consumed_bytes = 0; 2084 ssize_t bytes_avail = 0; 2085 2086 (void) offset; /* UNUSED */ 2087 2088 /* If we're here for the first time, initialize Ppmd8 decompression 2089 * context first. */ 2090 if(!zip->decompress_init) { 2091 ret = zipx_ppmd8_init(a, zip); 2092 if(ret != ARCHIVE_OK) 2093 return ret; 2094 } 2095 2096 /* Fetch for more data. We're reading 1 byte here, but libarchive 2097 * should prefetch more bytes. */ 2098 (void) __archive_read_ahead(a, 1, &bytes_avail); 2099 if(bytes_avail < 0) { 2100 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2101 "Truncated PPMd8 file body"); 2102 return (ARCHIVE_FATAL); 2103 } 2104 2105 /* This counter will be updated inside ppmd_read(), which at one 2106 * point will be called by Ppmd8_DecodeSymbol. */ 2107 zip->zipx_ppmd_read_compressed = 0; 2108 2109 /* Decompression loop. */ 2110 do { 2111 int sym = __archive_ppmd8_functions.Ppmd8_DecodeSymbol( 2112 &zip->ppmd8); 2113 if(sym < 0) { 2114 zip->end_of_entry = 1; 2115 break; 2116 } 2117 2118 /* This field is set by ppmd_read() when there was no more data 2119 * to be read. */ 2120 if(zip->ppmd8_stream_failed) { 2121 archive_set_error(&a->archive, 2122 ARCHIVE_ERRNO_FILE_FORMAT, 2123 "Truncated PPMd8 file body"); 2124 return (ARCHIVE_FATAL); 2125 } 2126 2127 zip->uncompressed_buffer[consumed_bytes] = (uint8_t) sym; 2128 ++consumed_bytes; 2129 } while(consumed_bytes < zip->uncompressed_buffer_size); 2130 2131 /* Update pointers for libarchive. */ 2132 *buff = zip->uncompressed_buffer; 2133 *size = consumed_bytes; 2134 2135 /* Update pointers so we can continue decompression in another call. */ 2136 zip->entry_bytes_remaining -= zip->zipx_ppmd_read_compressed; 2137 zip->entry_compressed_bytes_read += zip->zipx_ppmd_read_compressed; 2138 zip->entry_uncompressed_bytes_read += consumed_bytes; 2139 2140 /* If we're at the end of stream, deinitialize Ppmd8 context. */ 2141 if(zip->end_of_entry) { 2142 __archive_ppmd8_functions.Ppmd8_Free(&zip->ppmd8); 2143 zip->ppmd8_valid = 0; 2144 } 2145 2146 /* Seek for optional marker, same way as in each zip entry. */ 2147 ret = consume_optional_marker(a, zip); 2148 if (ret != ARCHIVE_OK) 2149 return ret; 2150 2151 return ARCHIVE_OK; 2152} 2153 2154#ifdef HAVE_BZLIB_H 2155static int 2156zipx_bzip2_init(struct archive_read *a, struct zip *zip) 2157{ 2158 int r; 2159 2160 /* Deallocate already existing BZ2 decompression context if it 2161 * exists. */ 2162 if(zip->bzstream_valid) { 2163 BZ2_bzDecompressEnd(&zip->bzstream); 2164 zip->bzstream_valid = 0; 2165 } 2166 2167 /* Allocate a new BZ2 decompression context. */ 2168 memset(&zip->bzstream, 0, sizeof(bz_stream)); 2169 r = BZ2_bzDecompressInit(&zip->bzstream, 0, 1); 2170 if(r != BZ_OK) { 2171 archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC, 2172 "bzip2 initialization failed(%d)", 2173 r); 2174 2175 return ARCHIVE_FAILED; 2176 } 2177 2178 /* Mark the bzstream field to be released in cleanup phase. */ 2179 zip->bzstream_valid = 1; 2180 2181 /* (Re)allocate the buffer that will contain decompressed bytes. */ 2182 free(zip->uncompressed_buffer); 2183 2184 zip->uncompressed_buffer_size = 256 * 1024; 2185 zip->uncompressed_buffer = 2186 (uint8_t*) malloc(zip->uncompressed_buffer_size); 2187 if (zip->uncompressed_buffer == NULL) { 2188 archive_set_error(&a->archive, ENOMEM, 2189 "No memory for bzip2 decompression"); 2190 return ARCHIVE_FATAL; 2191 } 2192 2193 /* Initialization done. */ 2194 zip->decompress_init = 1; 2195 return ARCHIVE_OK; 2196} 2197 2198static int 2199zip_read_data_zipx_bzip2(struct archive_read *a, const void **buff, 2200 size_t *size, int64_t *offset) 2201{ 2202 struct zip *zip = (struct zip *)(a->format->data); 2203 ssize_t bytes_avail = 0, in_bytes, to_consume; 2204 const void *compressed_buff; 2205 int r; 2206 uint64_t total_out; 2207 2208 (void) offset; /* UNUSED */ 2209 2210 /* Initialize decompression context if we're here for the first time. */ 2211 if(!zip->decompress_init) { 2212 r = zipx_bzip2_init(a, zip); 2213 if(r != ARCHIVE_OK) 2214 return r; 2215 } 2216 2217 /* Fetch more compressed bytes. */ 2218 compressed_buff = __archive_read_ahead(a, 1, &bytes_avail); 2219 if(bytes_avail < 0) { 2220 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2221 "Truncated bzip2 file body"); 2222 return (ARCHIVE_FATAL); 2223 } 2224 2225 in_bytes = zipmin(zip->entry_bytes_remaining, bytes_avail); 2226 if(in_bytes < 1) { 2227 /* libbz2 doesn't complain when caller feeds avail_in == 0. 2228 * It will actually return success in this case, which is 2229 * undesirable. This is why we need to make this check 2230 * manually. */ 2231 2232 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2233 "Truncated bzip2 file body"); 2234 return (ARCHIVE_FATAL); 2235 } 2236 2237 /* Setup buffer boundaries. */ 2238 zip->bzstream.next_in = (char*)(uintptr_t) compressed_buff; 2239 zip->bzstream.avail_in = in_bytes; 2240 zip->bzstream.total_in_hi32 = 0; 2241 zip->bzstream.total_in_lo32 = 0; 2242 zip->bzstream.next_out = (char*) zip->uncompressed_buffer; 2243 zip->bzstream.avail_out = zip->uncompressed_buffer_size; 2244 zip->bzstream.total_out_hi32 = 0; 2245 zip->bzstream.total_out_lo32 = 0; 2246 2247 /* Perform the decompression. */ 2248 r = BZ2_bzDecompress(&zip->bzstream); 2249 switch(r) { 2250 case BZ_STREAM_END: 2251 /* If we're at the end of the stream, deinitialize the 2252 * decompression context now. */ 2253 switch(BZ2_bzDecompressEnd(&zip->bzstream)) { 2254 case BZ_OK: 2255 break; 2256 default: 2257 archive_set_error(&a->archive, 2258 ARCHIVE_ERRNO_MISC, 2259 "Failed to clean up bzip2 " 2260 "decompressor"); 2261 return ARCHIVE_FATAL; 2262 } 2263 2264 zip->end_of_entry = 1; 2265 break; 2266 case BZ_OK: 2267 /* The decompressor has successfully decoded this 2268 * chunk of data, but more data is still in queue. */ 2269 break; 2270 default: 2271 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2272 "bzip2 decompression failed"); 2273 return ARCHIVE_FATAL; 2274 } 2275 2276 /* Update the pointers so decompressor can continue decoding. */ 2277 to_consume = zip->bzstream.total_in_lo32; 2278 __archive_read_consume(a, to_consume); 2279 2280 total_out = ((uint64_t) zip->bzstream.total_out_hi32 << 32) + 2281 zip->bzstream.total_out_lo32; 2282 2283 zip->entry_bytes_remaining -= to_consume; 2284 zip->entry_compressed_bytes_read += to_consume; 2285 zip->entry_uncompressed_bytes_read += total_out; 2286 2287 /* Give libarchive its due. */ 2288 *size = total_out; 2289 *buff = zip->uncompressed_buffer; 2290 2291 /* Seek for optional marker, like in other entries. */ 2292 r = consume_optional_marker(a, zip); 2293 if(r != ARCHIVE_OK) 2294 return r; 2295 2296 return ARCHIVE_OK; 2297} 2298 2299#endif 2300 2301#ifdef HAVE_ZLIB_H 2302static int 2303zip_deflate_init(struct archive_read *a, struct zip *zip) 2304{ 2305 int r; 2306 2307 /* If we haven't yet read any data, initialize the decompressor. */ 2308 if (!zip->decompress_init) { 2309 if (zip->stream_valid) 2310 r = inflateReset(&zip->stream); 2311 else 2312 r = inflateInit2(&zip->stream, 2313 -15 /* Don't check for zlib header */); 2314 if (r != Z_OK) { 2315 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2316 "Can't initialize ZIP decompression."); 2317 return (ARCHIVE_FATAL); 2318 } 2319 /* Stream structure has been set up. */ 2320 zip->stream_valid = 1; 2321 /* We've initialized decompression for this stream. */ 2322 zip->decompress_init = 1; 2323 } 2324 return (ARCHIVE_OK); 2325} 2326 2327static int 2328zip_read_data_deflate(struct archive_read *a, const void **buff, 2329 size_t *size, int64_t *offset) 2330{ 2331 struct zip *zip; 2332 ssize_t bytes_avail; 2333 const void *compressed_buff, *sp; 2334 int r; 2335 2336 (void)offset; /* UNUSED */ 2337 2338 zip = (struct zip *)(a->format->data); 2339 2340 /* If the buffer hasn't been allocated, allocate it now. */ 2341 if (zip->uncompressed_buffer == NULL) { 2342 zip->uncompressed_buffer_size = 256 * 1024; 2343 zip->uncompressed_buffer 2344 = (unsigned char *)malloc(zip->uncompressed_buffer_size); 2345 if (zip->uncompressed_buffer == NULL) { 2346 archive_set_error(&a->archive, ENOMEM, 2347 "No memory for ZIP decompression"); 2348 return (ARCHIVE_FATAL); 2349 } 2350 } 2351 2352 r = zip_deflate_init(a, zip); 2353 if (r != ARCHIVE_OK) 2354 return (r); 2355 2356 /* 2357 * Note: '1' here is a performance optimization. 2358 * Recall that the decompression layer returns a count of 2359 * available bytes; asking for more than that forces the 2360 * decompressor to combine reads by copying data. 2361 */ 2362 compressed_buff = sp = __archive_read_ahead(a, 1, &bytes_avail); 2363 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) 2364 && bytes_avail > zip->entry_bytes_remaining) { 2365 bytes_avail = (ssize_t)zip->entry_bytes_remaining; 2366 } 2367 if (bytes_avail < 0) { 2368 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2369 "Truncated ZIP file body"); 2370 return (ARCHIVE_FATAL); 2371 } 2372 2373 if (zip->tctx_valid || zip->cctx_valid) { 2374 if (zip->decrypted_bytes_remaining < (size_t)bytes_avail) { 2375 size_t buff_remaining = 2376 (zip->decrypted_buffer + 2377 zip->decrypted_buffer_size) 2378 - (zip->decrypted_ptr + 2379 zip->decrypted_bytes_remaining); 2380 2381 if (buff_remaining > (size_t)bytes_avail) 2382 buff_remaining = (size_t)bytes_avail; 2383 2384 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) && 2385 zip->entry_bytes_remaining > 0) { 2386 if ((int64_t)(zip->decrypted_bytes_remaining 2387 + buff_remaining) 2388 > zip->entry_bytes_remaining) { 2389 if (zip->entry_bytes_remaining < 2390 (int64_t)zip->decrypted_bytes_remaining) 2391 buff_remaining = 0; 2392 else 2393 buff_remaining = 2394 (size_t)zip->entry_bytes_remaining 2395 - zip->decrypted_bytes_remaining; 2396 } 2397 } 2398 if (buff_remaining > 0) { 2399 if (zip->tctx_valid) { 2400 trad_enc_decrypt_update(&zip->tctx, 2401 compressed_buff, buff_remaining, 2402 zip->decrypted_ptr 2403 + zip->decrypted_bytes_remaining, 2404 buff_remaining); 2405 } else { 2406 size_t dsize = buff_remaining; 2407 archive_decrypto_aes_ctr_update( 2408 &zip->cctx, 2409 compressed_buff, buff_remaining, 2410 zip->decrypted_ptr 2411 + zip->decrypted_bytes_remaining, 2412 &dsize); 2413 } 2414 zip->decrypted_bytes_remaining += 2415 buff_remaining; 2416 } 2417 } 2418 bytes_avail = zip->decrypted_bytes_remaining; 2419 compressed_buff = (const char *)zip->decrypted_ptr; 2420 } 2421 2422 /* 2423 * A bug in zlib.h: stream.next_in should be marked 'const' 2424 * but isn't (the library never alters data through the 2425 * next_in pointer, only reads it). The result: this ugly 2426 * cast to remove 'const'. 2427 */ 2428 zip->stream.next_in = (Bytef *)(uintptr_t)(const void *)compressed_buff; 2429 zip->stream.avail_in = (uInt)bytes_avail; 2430 zip->stream.total_in = 0; 2431 zip->stream.next_out = zip->uncompressed_buffer; 2432 zip->stream.avail_out = (uInt)zip->uncompressed_buffer_size; 2433 zip->stream.total_out = 0; 2434 2435 r = inflate(&zip->stream, 0); 2436 switch (r) { 2437 case Z_OK: 2438 break; 2439 case Z_STREAM_END: 2440 zip->end_of_entry = 1; 2441 break; 2442 case Z_MEM_ERROR: 2443 archive_set_error(&a->archive, ENOMEM, 2444 "Out of memory for ZIP decompression"); 2445 return (ARCHIVE_FATAL); 2446 default: 2447 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2448 "ZIP decompression failed (%d)", r); 2449 return (ARCHIVE_FATAL); 2450 } 2451 2452 /* Consume as much as the compressor actually used. */ 2453 bytes_avail = zip->stream.total_in; 2454 if (zip->tctx_valid || zip->cctx_valid) { 2455 zip->decrypted_bytes_remaining -= bytes_avail; 2456 if (zip->decrypted_bytes_remaining == 0) 2457 zip->decrypted_ptr = zip->decrypted_buffer; 2458 else 2459 zip->decrypted_ptr += bytes_avail; 2460 } 2461 /* Calculate compressed data as much as we used.*/ 2462 if (zip->hctx_valid) 2463 archive_hmac_sha1_update(&zip->hctx, sp, bytes_avail); 2464 __archive_read_consume(a, bytes_avail); 2465 zip->entry_bytes_remaining -= bytes_avail; 2466 zip->entry_compressed_bytes_read += bytes_avail; 2467 2468 *size = zip->stream.total_out; 2469 zip->entry_uncompressed_bytes_read += zip->stream.total_out; 2470 *buff = zip->uncompressed_buffer; 2471 2472 if (zip->end_of_entry && zip->hctx_valid) { 2473 r = check_authentication_code(a, NULL); 2474 if (r != ARCHIVE_OK) 2475 return (r); 2476 } 2477 2478 r = consume_optional_marker(a, zip); 2479 if (r != ARCHIVE_OK) 2480 return (r); 2481 2482 return (ARCHIVE_OK); 2483} 2484#endif 2485 2486static int 2487read_decryption_header(struct archive_read *a) 2488{ 2489 struct zip *zip = (struct zip *)(a->format->data); 2490 const char *p; 2491 unsigned int remaining_size; 2492 unsigned int ts; 2493 2494 /* 2495 * Read an initialization vector data field. 2496 */ 2497 p = __archive_read_ahead(a, 2, NULL); 2498 if (p == NULL) 2499 goto truncated; 2500 ts = zip->iv_size; 2501 zip->iv_size = archive_le16dec(p); 2502 __archive_read_consume(a, 2); 2503 if (ts < zip->iv_size) { 2504 free(zip->iv); 2505 zip->iv = NULL; 2506 } 2507 p = __archive_read_ahead(a, zip->iv_size, NULL); 2508 if (p == NULL) 2509 goto truncated; 2510 if (zip->iv == NULL) { 2511 zip->iv = malloc(zip->iv_size); 2512 if (zip->iv == NULL) 2513 goto nomem; 2514 } 2515 memcpy(zip->iv, p, zip->iv_size); 2516 __archive_read_consume(a, zip->iv_size); 2517 2518 /* 2519 * Read a size of remaining decryption header field. 2520 */ 2521 p = __archive_read_ahead(a, 14, NULL); 2522 if (p == NULL) 2523 goto truncated; 2524 remaining_size = archive_le32dec(p); 2525 if (remaining_size < 16 || remaining_size > (1 << 18)) 2526 goto corrupted; 2527 2528 /* Check if format version is supported. */ 2529 if (archive_le16dec(p+4) != 3) { 2530 archive_set_error(&a->archive, 2531 ARCHIVE_ERRNO_FILE_FORMAT, 2532 "Unsupported encryption format version: %u", 2533 archive_le16dec(p+4)); 2534 return (ARCHIVE_FAILED); 2535 } 2536 2537 /* 2538 * Read an encryption algorithm field. 2539 */ 2540 zip->alg_id = archive_le16dec(p+6); 2541 switch (zip->alg_id) { 2542 case 0x6601:/* DES */ 2543 case 0x6602:/* RC2 */ 2544 case 0x6603:/* 3DES 168 */ 2545 case 0x6609:/* 3DES 112 */ 2546 case 0x660E:/* AES 128 */ 2547 case 0x660F:/* AES 192 */ 2548 case 0x6610:/* AES 256 */ 2549 case 0x6702:/* RC2 (version >= 5.2) */ 2550 case 0x6720:/* Blowfish */ 2551 case 0x6721:/* Twofish */ 2552 case 0x6801:/* RC4 */ 2553 /* Supported encryption algorithm. */ 2554 break; 2555 default: 2556 archive_set_error(&a->archive, 2557 ARCHIVE_ERRNO_FILE_FORMAT, 2558 "Unknown encryption algorithm: %u", zip->alg_id); 2559 return (ARCHIVE_FAILED); 2560 } 2561 2562 /* 2563 * Read a bit length field. 2564 */ 2565 zip->bit_len = archive_le16dec(p+8); 2566 2567 /* 2568 * Read a flags field. 2569 */ 2570 zip->flags = archive_le16dec(p+10); 2571 switch (zip->flags & 0xf000) { 2572 case 0x0001: /* Password is required to decrypt. */ 2573 case 0x0002: /* Certificates only. */ 2574 case 0x0003: /* Password or certificate required to decrypt. */ 2575 break; 2576 default: 2577 archive_set_error(&a->archive, 2578 ARCHIVE_ERRNO_FILE_FORMAT, 2579 "Unknown encryption flag: %u", zip->flags); 2580 return (ARCHIVE_FAILED); 2581 } 2582 if ((zip->flags & 0xf000) == 0 || 2583 (zip->flags & 0xf000) == 0x4000) { 2584 archive_set_error(&a->archive, 2585 ARCHIVE_ERRNO_FILE_FORMAT, 2586 "Unknown encryption flag: %u", zip->flags); 2587 return (ARCHIVE_FAILED); 2588 } 2589 2590 /* 2591 * Read an encrypted random data field. 2592 */ 2593 ts = zip->erd_size; 2594 zip->erd_size = archive_le16dec(p+12); 2595 __archive_read_consume(a, 14); 2596 if ((zip->erd_size & 0xf) != 0 || 2597 (zip->erd_size + 16) > remaining_size || 2598 (zip->erd_size + 16) < zip->erd_size) 2599 goto corrupted; 2600 2601 if (ts < zip->erd_size) { 2602 free(zip->erd); 2603 zip->erd = NULL; 2604 } 2605 p = __archive_read_ahead(a, zip->erd_size, NULL); 2606 if (p == NULL) 2607 goto truncated; 2608 if (zip->erd == NULL) { 2609 zip->erd = malloc(zip->erd_size); 2610 if (zip->erd == NULL) 2611 goto nomem; 2612 } 2613 memcpy(zip->erd, p, zip->erd_size); 2614 __archive_read_consume(a, zip->erd_size); 2615 2616 /* 2617 * Read a reserved data field. 2618 */ 2619 p = __archive_read_ahead(a, 4, NULL); 2620 if (p == NULL) 2621 goto truncated; 2622 /* Reserved data size should be zero. */ 2623 if (archive_le32dec(p) != 0) 2624 goto corrupted; 2625 __archive_read_consume(a, 4); 2626 2627 /* 2628 * Read a password validation data field. 2629 */ 2630 p = __archive_read_ahead(a, 2, NULL); 2631 if (p == NULL) 2632 goto truncated; 2633 ts = zip->v_size; 2634 zip->v_size = archive_le16dec(p); 2635 __archive_read_consume(a, 2); 2636 if ((zip->v_size & 0x0f) != 0 || 2637 (zip->erd_size + zip->v_size + 16) > remaining_size || 2638 (zip->erd_size + zip->v_size + 16) < (zip->erd_size + zip->v_size)) 2639 goto corrupted; 2640 if (ts < zip->v_size) { 2641 free(zip->v_data); 2642 zip->v_data = NULL; 2643 } 2644 p = __archive_read_ahead(a, zip->v_size, NULL); 2645 if (p == NULL) 2646 goto truncated; 2647 if (zip->v_data == NULL) { 2648 zip->v_data = malloc(zip->v_size); 2649 if (zip->v_data == NULL) 2650 goto nomem; 2651 } 2652 memcpy(zip->v_data, p, zip->v_size); 2653 __archive_read_consume(a, zip->v_size); 2654 2655 p = __archive_read_ahead(a, 4, NULL); 2656 if (p == NULL) 2657 goto truncated; 2658 zip->v_crc32 = archive_le32dec(p); 2659 __archive_read_consume(a, 4); 2660 2661 /*return (ARCHIVE_OK); 2662 * This is not fully implemented yet.*/ 2663 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2664 "Encrypted file is unsupported"); 2665 return (ARCHIVE_FAILED); 2666truncated: 2667 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2668 "Truncated ZIP file data"); 2669 return (ARCHIVE_FATAL); 2670corrupted: 2671 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2672 "Corrupted ZIP file data"); 2673 return (ARCHIVE_FATAL); 2674nomem: 2675 archive_set_error(&a->archive, ENOMEM, 2676 "No memory for ZIP decryption"); 2677 return (ARCHIVE_FATAL); 2678} 2679 2680static int 2681zip_alloc_decryption_buffer(struct archive_read *a) 2682{ 2683 struct zip *zip = (struct zip *)(a->format->data); 2684 size_t bs = 256 * 1024; 2685 2686 if (zip->decrypted_buffer == NULL) { 2687 zip->decrypted_buffer_size = bs; 2688 zip->decrypted_buffer = malloc(bs); 2689 if (zip->decrypted_buffer == NULL) { 2690 archive_set_error(&a->archive, ENOMEM, 2691 "No memory for ZIP decryption"); 2692 return (ARCHIVE_FATAL); 2693 } 2694 } 2695 zip->decrypted_ptr = zip->decrypted_buffer; 2696 return (ARCHIVE_OK); 2697} 2698 2699static int 2700init_traditional_PKWARE_decryption(struct archive_read *a) 2701{ 2702 struct zip *zip = (struct zip *)(a->format->data); 2703 const void *p; 2704 int retry; 2705 int r; 2706 2707 if (zip->tctx_valid) 2708 return (ARCHIVE_OK); 2709 2710 /* 2711 Read the 12 bytes encryption header stored at 2712 the start of the data area. 2713 */ 2714#define ENC_HEADER_SIZE 12 2715 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) 2716 && zip->entry_bytes_remaining < ENC_HEADER_SIZE) { 2717 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2718 "Truncated Zip encrypted body: only %jd bytes available", 2719 (intmax_t)zip->entry_bytes_remaining); 2720 return (ARCHIVE_FATAL); 2721 } 2722 2723 p = __archive_read_ahead(a, ENC_HEADER_SIZE, NULL); 2724 if (p == NULL) { 2725 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2726 "Truncated ZIP file data"); 2727 return (ARCHIVE_FATAL); 2728 } 2729 2730 for (retry = 0;; retry++) { 2731 const char *passphrase; 2732 uint8_t crcchk; 2733 2734 passphrase = __archive_read_next_passphrase(a); 2735 if (passphrase == NULL) { 2736 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2737 (retry > 0)? 2738 "Incorrect passphrase": 2739 "Passphrase required for this entry"); 2740 return (ARCHIVE_FAILED); 2741 } 2742 2743 /* 2744 * Initialize ctx for Traditional PKWARE Decryption. 2745 */ 2746 r = trad_enc_init(&zip->tctx, passphrase, strlen(passphrase), 2747 p, ENC_HEADER_SIZE, &crcchk); 2748 if (r == 0 && crcchk == zip->entry->decdat) 2749 break;/* The passphrase is OK. */ 2750 if (retry > 10000) { 2751 /* Avoid infinity loop. */ 2752 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2753 "Too many incorrect passphrases"); 2754 return (ARCHIVE_FAILED); 2755 } 2756 } 2757 2758 __archive_read_consume(a, ENC_HEADER_SIZE); 2759 zip->tctx_valid = 1; 2760 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)) { 2761 zip->entry_bytes_remaining -= ENC_HEADER_SIZE; 2762 } 2763 /*zip->entry_uncompressed_bytes_read += ENC_HEADER_SIZE;*/ 2764 zip->entry_compressed_bytes_read += ENC_HEADER_SIZE; 2765 zip->decrypted_bytes_remaining = 0; 2766 2767 return (zip_alloc_decryption_buffer(a)); 2768#undef ENC_HEADER_SIZE 2769} 2770 2771static int 2772init_WinZip_AES_decryption(struct archive_read *a) 2773{ 2774 struct zip *zip = (struct zip *)(a->format->data); 2775 const void *p; 2776 const uint8_t *pv; 2777 size_t key_len, salt_len; 2778 uint8_t derived_key[MAX_DERIVED_KEY_BUF_SIZE]; 2779 int retry; 2780 int r; 2781 2782 if (zip->cctx_valid || zip->hctx_valid) 2783 return (ARCHIVE_OK); 2784 2785 switch (zip->entry->aes_extra.strength) { 2786 case 1: salt_len = 8; key_len = 16; break; 2787 case 2: salt_len = 12; key_len = 24; break; 2788 case 3: salt_len = 16; key_len = 32; break; 2789 default: goto corrupted; 2790 } 2791 p = __archive_read_ahead(a, salt_len + 2, NULL); 2792 if (p == NULL) 2793 goto truncated; 2794 2795 for (retry = 0;; retry++) { 2796 const char *passphrase; 2797 2798 passphrase = __archive_read_next_passphrase(a); 2799 if (passphrase == NULL) { 2800 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2801 (retry > 0)? 2802 "Incorrect passphrase": 2803 "Passphrase required for this entry"); 2804 return (ARCHIVE_FAILED); 2805 } 2806 memset(derived_key, 0, sizeof(derived_key)); 2807 r = archive_pbkdf2_sha1(passphrase, strlen(passphrase), 2808 p, salt_len, 1000, derived_key, key_len * 2 + 2); 2809 if (r != 0) { 2810 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2811 "Decryption is unsupported due to lack of " 2812 "crypto library"); 2813 return (ARCHIVE_FAILED); 2814 } 2815 2816 /* Check password verification value. */ 2817 pv = ((const uint8_t *)p) + salt_len; 2818 if (derived_key[key_len * 2] == pv[0] && 2819 derived_key[key_len * 2 + 1] == pv[1]) 2820 break;/* The passphrase is OK. */ 2821 if (retry > 10000) { 2822 /* Avoid infinity loop. */ 2823 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2824 "Too many incorrect passphrases"); 2825 return (ARCHIVE_FAILED); 2826 } 2827 } 2828 2829 r = archive_decrypto_aes_ctr_init(&zip->cctx, derived_key, key_len); 2830 if (r != 0) { 2831 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2832 "Decryption is unsupported due to lack of crypto library"); 2833 return (ARCHIVE_FAILED); 2834 } 2835 r = archive_hmac_sha1_init(&zip->hctx, derived_key + key_len, key_len); 2836 if (r != 0) { 2837 archive_decrypto_aes_ctr_release(&zip->cctx); 2838 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2839 "Failed to initialize HMAC-SHA1"); 2840 return (ARCHIVE_FAILED); 2841 } 2842 zip->cctx_valid = zip->hctx_valid = 1; 2843 __archive_read_consume(a, salt_len + 2); 2844 zip->entry_bytes_remaining -= salt_len + 2 + AUTH_CODE_SIZE; 2845 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) 2846 && zip->entry_bytes_remaining < 0) 2847 goto corrupted; 2848 zip->entry_compressed_bytes_read += salt_len + 2 + AUTH_CODE_SIZE; 2849 zip->decrypted_bytes_remaining = 0; 2850 2851 zip->entry->compression = zip->entry->aes_extra.compression; 2852 return (zip_alloc_decryption_buffer(a)); 2853 2854truncated: 2855 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2856 "Truncated ZIP file data"); 2857 return (ARCHIVE_FATAL); 2858corrupted: 2859 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2860 "Corrupted ZIP file data"); 2861 return (ARCHIVE_FATAL); 2862} 2863 2864static int 2865archive_read_format_zip_read_data(struct archive_read *a, 2866 const void **buff, size_t *size, int64_t *offset) 2867{ 2868 int r; 2869 struct zip *zip = (struct zip *)(a->format->data); 2870 2871 if (zip->has_encrypted_entries == 2872 ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) { 2873 zip->has_encrypted_entries = 0; 2874 } 2875 2876 *offset = zip->entry_uncompressed_bytes_read; 2877 *size = 0; 2878 *buff = NULL; 2879 2880 /* If we hit end-of-entry last time, return ARCHIVE_EOF. */ 2881 if (zip->end_of_entry) 2882 return (ARCHIVE_EOF); 2883 2884 /* Return EOF immediately if this is a non-regular file. */ 2885 if (AE_IFREG != (zip->entry->mode & AE_IFMT)) 2886 return (ARCHIVE_EOF); 2887 2888 __archive_read_consume(a, zip->unconsumed); 2889 zip->unconsumed = 0; 2890 2891 if (zip->init_decryption) { 2892 zip->has_encrypted_entries = 1; 2893 if (zip->entry->zip_flags & ZIP_STRONG_ENCRYPTED) 2894 r = read_decryption_header(a); 2895 else if (zip->entry->compression == WINZIP_AES_ENCRYPTION) 2896 r = init_WinZip_AES_decryption(a); 2897 else 2898 r = init_traditional_PKWARE_decryption(a); 2899 if (r != ARCHIVE_OK) 2900 return (r); 2901 zip->init_decryption = 0; 2902 } 2903 2904 switch(zip->entry->compression) { 2905 case 0: /* No compression. */ 2906 r = zip_read_data_none(a, buff, size, offset); 2907 break; 2908#ifdef HAVE_BZLIB_H 2909 case 12: /* ZIPx bzip2 compression. */ 2910 r = zip_read_data_zipx_bzip2(a, buff, size, offset); 2911 break; 2912#endif 2913#if HAVE_LZMA_H && HAVE_LIBLZMA 2914 case 14: /* ZIPx LZMA compression. */ 2915 r = zip_read_data_zipx_lzma_alone(a, buff, size, offset); 2916 break; 2917 case 95: /* ZIPx XZ compression. */ 2918 r = zip_read_data_zipx_xz(a, buff, size, offset); 2919 break; 2920#endif 2921 /* PPMd support is built-in, so we don't need any #if guards. */ 2922 case 98: /* ZIPx PPMd compression. */ 2923 r = zip_read_data_zipx_ppmd(a, buff, size, offset); 2924 break; 2925 2926#ifdef HAVE_ZLIB_H 2927 case 8: /* Deflate compression. */ 2928 r = zip_read_data_deflate(a, buff, size, offset); 2929 break; 2930#endif 2931 default: /* Unsupported compression. */ 2932 /* Return a warning. */ 2933 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2934 "Unsupported ZIP compression method (%d: %s)", 2935 zip->entry->compression, compression_name(zip->entry->compression)); 2936 /* We can't decompress this entry, but we will 2937 * be able to skip() it and try the next entry. */ 2938 return (ARCHIVE_FAILED); 2939 break; 2940 } 2941 if (r != ARCHIVE_OK) 2942 return (r); 2943 /* Update checksum */ 2944 if (*size) 2945 zip->entry_crc32 = zip->crc32func(zip->entry_crc32, *buff, 2946 (unsigned)*size); 2947 /* If we hit the end, swallow any end-of-data marker. */ 2948 if (zip->end_of_entry) { 2949 /* Check file size, CRC against these values. */ 2950 if (zip->entry->compressed_size != 2951 zip->entry_compressed_bytes_read) { 2952 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2953 "ZIP compressed data is wrong size " 2954 "(read %jd, expected %jd)", 2955 (intmax_t)zip->entry_compressed_bytes_read, 2956 (intmax_t)zip->entry->compressed_size); 2957 return (ARCHIVE_WARN); 2958 } 2959 /* Size field only stores the lower 32 bits of the actual 2960 * size. */ 2961 if ((zip->entry->uncompressed_size & UINT32_MAX) 2962 != (zip->entry_uncompressed_bytes_read & UINT32_MAX)) { 2963 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2964 "ZIP uncompressed data is wrong size " 2965 "(read %jd, expected %jd)\n", 2966 (intmax_t)zip->entry_uncompressed_bytes_read, 2967 (intmax_t)zip->entry->uncompressed_size); 2968 return (ARCHIVE_WARN); 2969 } 2970 /* Check computed CRC against header */ 2971 if ((!zip->hctx_valid || 2972 zip->entry->aes_extra.vendor != AES_VENDOR_AE_2) && 2973 zip->entry->crc32 != zip->entry_crc32 2974 && !zip->ignore_crc32) { 2975 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2976 "ZIP bad CRC: 0x%lx should be 0x%lx", 2977 (unsigned long)zip->entry_crc32, 2978 (unsigned long)zip->entry->crc32); 2979 return (ARCHIVE_WARN); 2980 } 2981 } 2982 2983 return (ARCHIVE_OK); 2984} 2985 2986static int 2987archive_read_format_zip_cleanup(struct archive_read *a) 2988{ 2989 struct zip *zip; 2990 struct zip_entry *zip_entry, *next_zip_entry; 2991 2992 zip = (struct zip *)(a->format->data); 2993 2994#ifdef HAVE_ZLIB_H 2995 if (zip->stream_valid) 2996 inflateEnd(&zip->stream); 2997#endif 2998 2999#if HAVE_LZMA_H && HAVE_LIBLZMA 3000 if (zip->zipx_lzma_valid) { 3001 lzma_end(&zip->zipx_lzma_stream); 3002 } 3003#endif 3004 3005#ifdef HAVE_BZLIB_H 3006 if (zip->bzstream_valid) { 3007 BZ2_bzDecompressEnd(&zip->bzstream); 3008 } 3009#endif 3010 3011 free(zip->uncompressed_buffer); 3012 3013 if (zip->ppmd8_valid) 3014 __archive_ppmd8_functions.Ppmd8_Free(&zip->ppmd8); 3015 3016 if (zip->zip_entries) { 3017 zip_entry = zip->zip_entries; 3018 while (zip_entry != NULL) { 3019 next_zip_entry = zip_entry->next; 3020 archive_string_free(&zip_entry->rsrcname); 3021 free(zip_entry); 3022 zip_entry = next_zip_entry; 3023 } 3024 } 3025 free(zip->decrypted_buffer); 3026 if (zip->cctx_valid) 3027 archive_decrypto_aes_ctr_release(&zip->cctx); 3028 if (zip->hctx_valid) 3029 archive_hmac_sha1_cleanup(&zip->hctx); 3030 free(zip->iv); 3031 free(zip->erd); 3032 free(zip->v_data); 3033 archive_string_free(&zip->format_name); 3034 free(zip); 3035 (a->format->data) = NULL; 3036 return (ARCHIVE_OK); 3037} 3038 3039static int 3040archive_read_format_zip_has_encrypted_entries(struct archive_read *_a) 3041{ 3042 if (_a && _a->format) { 3043 struct zip * zip = (struct zip *)_a->format->data; 3044 if (zip) { 3045 return zip->has_encrypted_entries; 3046 } 3047 } 3048 return ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW; 3049} 3050 3051static int 3052archive_read_format_zip_options(struct archive_read *a, 3053 const char *key, const char *val) 3054{ 3055 struct zip *zip; 3056 int ret = ARCHIVE_FAILED; 3057 3058 zip = (struct zip *)(a->format->data); 3059 if (strcmp(key, "compat-2x") == 0) { 3060 /* Handle filenames as libarchive 2.x */ 3061 zip->init_default_conversion = (val != NULL) ? 1 : 0; 3062 return (ARCHIVE_OK); 3063 } else if (strcmp(key, "hdrcharset") == 0) { 3064 if (val == NULL || val[0] == 0) 3065 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 3066 "zip: hdrcharset option needs a character-set name" 3067 ); 3068 else { 3069 zip->sconv = archive_string_conversion_from_charset( 3070 &a->archive, val, 0); 3071 if (zip->sconv != NULL) { 3072 if (strcmp(val, "UTF-8") == 0) 3073 zip->sconv_utf8 = zip->sconv; 3074 ret = ARCHIVE_OK; 3075 } else 3076 ret = ARCHIVE_FATAL; 3077 } 3078 return (ret); 3079 } else if (strcmp(key, "ignorecrc32") == 0) { 3080 /* Mostly useful for testing. */ 3081 if (val == NULL || val[0] == 0) { 3082 zip->crc32func = real_crc32; 3083 zip->ignore_crc32 = 0; 3084 } else { 3085 zip->crc32func = fake_crc32; 3086 zip->ignore_crc32 = 1; 3087 } 3088 return (ARCHIVE_OK); 3089 } else if (strcmp(key, "mac-ext") == 0) { 3090 zip->process_mac_extensions = (val != NULL && val[0] != 0); 3091 return (ARCHIVE_OK); 3092 } 3093 3094 /* Note: The "warn" return is just to inform the options 3095 * supervisor that we didn't handle it. It will generate 3096 * a suitable error if no one used this option. */ 3097 return (ARCHIVE_WARN); 3098} 3099 3100int 3101archive_read_support_format_zip(struct archive *a) 3102{ 3103 int r; 3104 r = archive_read_support_format_zip_streamable(a); 3105 if (r != ARCHIVE_OK) 3106 return r; 3107 return (archive_read_support_format_zip_seekable(a)); 3108} 3109 3110/* ------------------------------------------------------------------------ */ 3111 3112/* 3113 * Streaming-mode support 3114 */ 3115 3116 3117static int 3118archive_read_support_format_zip_capabilities_streamable(struct archive_read * a) 3119{ 3120 (void)a; /* UNUSED */ 3121 return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA | 3122 ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA); 3123} 3124 3125static int 3126archive_read_format_zip_streamable_bid(struct archive_read *a, int best_bid) 3127{ 3128 const char *p; 3129 3130 (void)best_bid; /* UNUSED */ 3131 3132 if ((p = __archive_read_ahead(a, 4, NULL)) == NULL) 3133 return (-1); 3134 3135 /* 3136 * Bid of 29 here comes from: 3137 * + 16 bits for "PK", 3138 * + next 16-bit field has 6 options so contributes 3139 * about 16 - log_2(6) ~= 16 - 2.6 ~= 13 bits 3140 * 3141 * So we've effectively verified ~29 total bits of check data. 3142 */ 3143 if (p[0] == 'P' && p[1] == 'K') { 3144 if ((p[2] == '\001' && p[3] == '\002') 3145 || (p[2] == '\003' && p[3] == '\004') 3146 || (p[2] == '\005' && p[3] == '\006') 3147 || (p[2] == '\006' && p[3] == '\006') 3148 || (p[2] == '\007' && p[3] == '\010') 3149 || (p[2] == '0' && p[3] == '0')) 3150 return (29); 3151 } 3152 3153 /* TODO: It's worth looking ahead a little bit for a valid 3154 * PK signature. In particular, that would make it possible 3155 * to read some UUEncoded SFX files or SFX files coming from 3156 * a network socket. */ 3157 3158 return (0); 3159} 3160 3161static int 3162archive_read_format_zip_streamable_read_header(struct archive_read *a, 3163 struct archive_entry *entry) 3164{ 3165 struct zip *zip; 3166 3167 a->archive.archive_format = ARCHIVE_FORMAT_ZIP; 3168 if (a->archive.archive_format_name == NULL) 3169 a->archive.archive_format_name = "ZIP"; 3170 3171 zip = (struct zip *)(a->format->data); 3172 3173 /* 3174 * It should be sufficient to call archive_read_next_header() for 3175 * a reader to determine if an entry is encrypted or not. If the 3176 * encryption of an entry is only detectable when calling 3177 * archive_read_data(), so be it. We'll do the same check there 3178 * as well. 3179 */ 3180 if (zip->has_encrypted_entries == 3181 ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) 3182 zip->has_encrypted_entries = 0; 3183 3184 /* Make sure we have a zip_entry structure to use. */ 3185 if (zip->zip_entries == NULL) { 3186 zip->zip_entries = malloc(sizeof(struct zip_entry)); 3187 if (zip->zip_entries == NULL) { 3188 archive_set_error(&a->archive, ENOMEM, 3189 "Out of memory"); 3190 return ARCHIVE_FATAL; 3191 } 3192 } 3193 zip->entry = zip->zip_entries; 3194 memset(zip->entry, 0, sizeof(struct zip_entry)); 3195 3196 if (zip->cctx_valid) 3197 archive_decrypto_aes_ctr_release(&zip->cctx); 3198 if (zip->hctx_valid) 3199 archive_hmac_sha1_cleanup(&zip->hctx); 3200 zip->tctx_valid = zip->cctx_valid = zip->hctx_valid = 0; 3201 __archive_read_reset_passphrase(a); 3202 3203 /* Search ahead for the next local file header. */ 3204 __archive_read_consume(a, zip->unconsumed); 3205 zip->unconsumed = 0; 3206 for (;;) { 3207 int64_t skipped = 0; 3208 const char *p, *end; 3209 ssize_t bytes; 3210 3211 p = __archive_read_ahead(a, 4, &bytes); 3212 if (p == NULL) 3213 return (ARCHIVE_FATAL); 3214 end = p + bytes; 3215 3216 while (p + 4 <= end) { 3217 if (p[0] == 'P' && p[1] == 'K') { 3218 if (p[2] == '\003' && p[3] == '\004') { 3219 /* Regular file entry. */ 3220 __archive_read_consume(a, skipped); 3221 return zip_read_local_file_header(a, 3222 entry, zip); 3223 } 3224 3225 /* 3226 * TODO: We cannot restore permissions 3227 * based only on the local file headers. 3228 * Consider scanning the central 3229 * directory and returning additional 3230 * entries for at least directories. 3231 * This would allow us to properly set 3232 * directory permissions. 3233 * 3234 * This won't help us fix symlinks 3235 * and may not help with regular file 3236 * permissions, either. <sigh> 3237 */ 3238 if (p[2] == '\001' && p[3] == '\002') { 3239 return (ARCHIVE_EOF); 3240 } 3241 3242 /* End of central directory? Must be an 3243 * empty archive. */ 3244 if ((p[2] == '\005' && p[3] == '\006') 3245 || (p[2] == '\006' && p[3] == '\006')) 3246 return (ARCHIVE_EOF); 3247 } 3248 ++p; 3249 ++skipped; 3250 } 3251 __archive_read_consume(a, skipped); 3252 } 3253} 3254 3255static int 3256archive_read_format_zip_read_data_skip_streamable(struct archive_read *a) 3257{ 3258 struct zip *zip; 3259 int64_t bytes_skipped; 3260 3261 zip = (struct zip *)(a->format->data); 3262 bytes_skipped = __archive_read_consume(a, zip->unconsumed); 3263 zip->unconsumed = 0; 3264 if (bytes_skipped < 0) 3265 return (ARCHIVE_FATAL); 3266 3267 /* If we've already read to end of data, we're done. */ 3268 if (zip->end_of_entry) 3269 return (ARCHIVE_OK); 3270 3271 /* So we know we're streaming... */ 3272 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) 3273 || zip->entry->compressed_size > 0) { 3274 /* We know the compressed length, so we can just skip. */ 3275 bytes_skipped = __archive_read_consume(a, 3276 zip->entry_bytes_remaining); 3277 if (bytes_skipped < 0) 3278 return (ARCHIVE_FATAL); 3279 return (ARCHIVE_OK); 3280 } 3281 3282 if (zip->init_decryption) { 3283 int r; 3284 3285 zip->has_encrypted_entries = 1; 3286 if (zip->entry->zip_flags & ZIP_STRONG_ENCRYPTED) 3287 r = read_decryption_header(a); 3288 else if (zip->entry->compression == WINZIP_AES_ENCRYPTION) 3289 r = init_WinZip_AES_decryption(a); 3290 else 3291 r = init_traditional_PKWARE_decryption(a); 3292 if (r != ARCHIVE_OK) 3293 return (r); 3294 zip->init_decryption = 0; 3295 } 3296 3297 /* We're streaming and we don't know the length. */ 3298 /* If the body is compressed and we know the format, we can 3299 * find an exact end-of-entry by decompressing it. */ 3300 switch (zip->entry->compression) { 3301#ifdef HAVE_ZLIB_H 3302 case 8: /* Deflate compression. */ 3303 while (!zip->end_of_entry) { 3304 int64_t offset = 0; 3305 const void *buff = NULL; 3306 size_t size = 0; 3307 int r; 3308 r = zip_read_data_deflate(a, &buff, &size, &offset); 3309 if (r != ARCHIVE_OK) 3310 return (r); 3311 } 3312 return ARCHIVE_OK; 3313#endif 3314 default: /* Uncompressed or unknown. */ 3315 /* Scan for a PK\007\010 signature. */ 3316 for (;;) { 3317 const char *p, *buff; 3318 ssize_t bytes_avail; 3319 buff = __archive_read_ahead(a, 16, &bytes_avail); 3320 if (bytes_avail < 16) { 3321 archive_set_error(&a->archive, 3322 ARCHIVE_ERRNO_FILE_FORMAT, 3323 "Truncated ZIP file data"); 3324 return (ARCHIVE_FATAL); 3325 } 3326 p = buff; 3327 while (p <= buff + bytes_avail - 16) { 3328 if (p[3] == 'P') { p += 3; } 3329 else if (p[3] == 'K') { p += 2; } 3330 else if (p[3] == '\007') { p += 1; } 3331 else if (p[3] == '\010' && p[2] == '\007' 3332 && p[1] == 'K' && p[0] == 'P') { 3333 if (zip->entry->flags & LA_USED_ZIP64) 3334 __archive_read_consume(a, 3335 p - buff + 24); 3336 else 3337 __archive_read_consume(a, 3338 p - buff + 16); 3339 return ARCHIVE_OK; 3340 } else { p += 4; } 3341 } 3342 __archive_read_consume(a, p - buff); 3343 } 3344 } 3345} 3346 3347int 3348archive_read_support_format_zip_streamable(struct archive *_a) 3349{ 3350 struct archive_read *a = (struct archive_read *)_a; 3351 struct zip *zip; 3352 int r; 3353 3354 archive_check_magic(_a, ARCHIVE_READ_MAGIC, 3355 ARCHIVE_STATE_NEW, "archive_read_support_format_zip"); 3356 3357 zip = (struct zip *)calloc(1, sizeof(*zip)); 3358 if (zip == NULL) { 3359 archive_set_error(&a->archive, ENOMEM, 3360 "Can't allocate zip data"); 3361 return (ARCHIVE_FATAL); 3362 } 3363 3364 /* Streamable reader doesn't support mac extensions. */ 3365 zip->process_mac_extensions = 0; 3366 3367 /* 3368 * Until enough data has been read, we cannot tell about 3369 * any encrypted entries yet. 3370 */ 3371 zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW; 3372 zip->crc32func = real_crc32; 3373 3374 r = __archive_read_register_format(a, 3375 zip, 3376 "zip", 3377 archive_read_format_zip_streamable_bid, 3378 archive_read_format_zip_options, 3379 archive_read_format_zip_streamable_read_header, 3380 archive_read_format_zip_read_data, 3381 archive_read_format_zip_read_data_skip_streamable, 3382 NULL, 3383 archive_read_format_zip_cleanup, 3384 archive_read_support_format_zip_capabilities_streamable, 3385 archive_read_format_zip_has_encrypted_entries); 3386 3387 if (r != ARCHIVE_OK) 3388 free(zip); 3389 return (ARCHIVE_OK); 3390} 3391 3392/* ------------------------------------------------------------------------ */ 3393 3394/* 3395 * Seeking-mode support 3396 */ 3397 3398static int 3399archive_read_support_format_zip_capabilities_seekable(struct archive_read * a) 3400{ 3401 (void)a; /* UNUSED */ 3402 return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA | 3403 ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA); 3404} 3405 3406/* 3407 * TODO: This is a performance sink because it forces the read core to 3408 * drop buffered data from the start of file, which will then have to 3409 * be re-read again if this bidder loses. 3410 * 3411 * We workaround this a little by passing in the best bid so far so 3412 * that later bidders can do nothing if they know they'll never 3413 * outbid. But we can certainly do better... 3414 */ 3415static int 3416read_eocd(struct zip *zip, const char *p, int64_t current_offset) 3417{ 3418 /* Sanity-check the EOCD we've found. */ 3419 3420 /* This must be the first volume. */ 3421 if (archive_le16dec(p + 4) != 0) 3422 return 0; 3423 /* Central directory must be on this volume. */ 3424 if (archive_le16dec(p + 4) != archive_le16dec(p + 6)) 3425 return 0; 3426 /* All central directory entries must be on this volume. */ 3427 if (archive_le16dec(p + 10) != archive_le16dec(p + 8)) 3428 return 0; 3429 /* Central directory can't extend beyond start of EOCD record. */ 3430 if (archive_le32dec(p + 16) + archive_le32dec(p + 12) 3431 > current_offset) 3432 return 0; 3433 3434 /* Save the central directory location for later use. */ 3435 zip->central_directory_offset = archive_le32dec(p + 16); 3436 3437 /* This is just a tiny bit higher than the maximum 3438 returned by the streaming Zip bidder. This ensures 3439 that the more accurate seeking Zip parser wins 3440 whenever seek is available. */ 3441 return 32; 3442} 3443 3444/* 3445 * Examine Zip64 EOCD locator: If it's valid, store the information 3446 * from it. 3447 */ 3448static int 3449read_zip64_eocd(struct archive_read *a, struct zip *zip, const char *p) 3450{ 3451 int64_t eocd64_offset; 3452 int64_t eocd64_size; 3453 3454 /* Sanity-check the locator record. */ 3455 3456 /* Central dir must be on first volume. */ 3457 if (archive_le32dec(p + 4) != 0) 3458 return 0; 3459 /* Must be only a single volume. */ 3460 if (archive_le32dec(p + 16) != 1) 3461 return 0; 3462 3463 /* Find the Zip64 EOCD record. */ 3464 eocd64_offset = archive_le64dec(p + 8); 3465 if (__archive_read_seek(a, eocd64_offset, SEEK_SET) < 0) 3466 return 0; 3467 if ((p = __archive_read_ahead(a, 56, NULL)) == NULL) 3468 return 0; 3469 /* Make sure we can read all of it. */ 3470 eocd64_size = archive_le64dec(p + 4) + 12; 3471 if (eocd64_size < 56 || eocd64_size > 16384) 3472 return 0; 3473 if ((p = __archive_read_ahead(a, (size_t)eocd64_size, NULL)) == NULL) 3474 return 0; 3475 3476 /* Sanity-check the EOCD64 */ 3477 if (archive_le32dec(p + 16) != 0) /* Must be disk #0 */ 3478 return 0; 3479 if (archive_le32dec(p + 20) != 0) /* CD must be on disk #0 */ 3480 return 0; 3481 /* CD can't be split. */ 3482 if (archive_le64dec(p + 24) != archive_le64dec(p + 32)) 3483 return 0; 3484 3485 /* Save the central directory offset for later use. */ 3486 zip->central_directory_offset = archive_le64dec(p + 48); 3487 3488 return 32; 3489} 3490 3491static int 3492archive_read_format_zip_seekable_bid(struct archive_read *a, int best_bid) 3493{ 3494 struct zip *zip = (struct zip *)a->format->data; 3495 int64_t file_size, current_offset; 3496 const char *p; 3497 int i, tail; 3498 3499 /* If someone has already bid more than 32, then avoid 3500 trashing the look-ahead buffers with a seek. */ 3501 if (best_bid > 32) 3502 return (-1); 3503 3504 file_size = __archive_read_seek(a, 0, SEEK_END); 3505 if (file_size <= 0) 3506 return 0; 3507 3508 /* Search last 16k of file for end-of-central-directory 3509 * record (which starts with PK\005\006) */ 3510 tail = (int)zipmin(1024 * 16, file_size); 3511 current_offset = __archive_read_seek(a, -tail, SEEK_END); 3512 if (current_offset < 0) 3513 return 0; 3514 if ((p = __archive_read_ahead(a, (size_t)tail, NULL)) == NULL) 3515 return 0; 3516 /* Boyer-Moore search backwards from the end, since we want 3517 * to match the last EOCD in the file (there can be more than 3518 * one if there is an uncompressed Zip archive as a member 3519 * within this Zip archive). */ 3520 for (i = tail - 22; i > 0;) { 3521 switch (p[i]) { 3522 case 'P': 3523 if (memcmp(p + i, "PK\005\006", 4) == 0) { 3524 int ret = read_eocd(zip, p + i, 3525 current_offset + i); 3526 /* Zip64 EOCD locator precedes 3527 * regular EOCD if present. */ 3528 if (i >= 20 && memcmp(p + i - 20, "PK\006\007", 4) == 0) { 3529 int ret_zip64 = read_zip64_eocd(a, zip, p + i - 20); 3530 if (ret_zip64 > ret) 3531 ret = ret_zip64; 3532 } 3533 return (ret); 3534 } 3535 i -= 4; 3536 break; 3537 case 'K': i -= 1; break; 3538 case 005: i -= 2; break; 3539 case 006: i -= 3; break; 3540 default: i -= 4; break; 3541 } 3542 } 3543 return 0; 3544} 3545 3546/* The red-black trees are only used in seeking mode to manage 3547 * the in-memory copy of the central directory. */ 3548 3549static int 3550cmp_node(const struct archive_rb_node *n1, const struct archive_rb_node *n2) 3551{ 3552 const struct zip_entry *e1 = (const struct zip_entry *)n1; 3553 const struct zip_entry *e2 = (const struct zip_entry *)n2; 3554 3555 if (e1->local_header_offset > e2->local_header_offset) 3556 return -1; 3557 if (e1->local_header_offset < e2->local_header_offset) 3558 return 1; 3559 return 0; 3560} 3561 3562static int 3563cmp_key(const struct archive_rb_node *n, const void *key) 3564{ 3565 /* This function won't be called */ 3566 (void)n; /* UNUSED */ 3567 (void)key; /* UNUSED */ 3568 return 1; 3569} 3570 3571static const struct archive_rb_tree_ops rb_ops = { 3572 &cmp_node, &cmp_key 3573}; 3574 3575static int 3576rsrc_cmp_node(const struct archive_rb_node *n1, 3577 const struct archive_rb_node *n2) 3578{ 3579 const struct zip_entry *e1 = (const struct zip_entry *)n1; 3580 const struct zip_entry *e2 = (const struct zip_entry *)n2; 3581 3582 return (strcmp(e2->rsrcname.s, e1->rsrcname.s)); 3583} 3584 3585static int 3586rsrc_cmp_key(const struct archive_rb_node *n, const void *key) 3587{ 3588 const struct zip_entry *e = (const struct zip_entry *)n; 3589 return (strcmp((const char *)key, e->rsrcname.s)); 3590} 3591 3592static const struct archive_rb_tree_ops rb_rsrc_ops = { 3593 &rsrc_cmp_node, &rsrc_cmp_key 3594}; 3595 3596static const char * 3597rsrc_basename(const char *name, size_t name_length) 3598{ 3599 const char *s, *r; 3600 3601 r = s = name; 3602 for (;;) { 3603 s = memchr(s, '/', name_length - (s - name)); 3604 if (s == NULL) 3605 break; 3606 r = ++s; 3607 } 3608 return (r); 3609} 3610 3611static void 3612expose_parent_dirs(struct zip *zip, const char *name, size_t name_length) 3613{ 3614 struct archive_string str; 3615 struct zip_entry *dir; 3616 char *s; 3617 3618 archive_string_init(&str); 3619 archive_strncpy(&str, name, name_length); 3620 for (;;) { 3621 s = strrchr(str.s, '/'); 3622 if (s == NULL) 3623 break; 3624 *s = '\0'; 3625 /* Transfer the parent directory from zip->tree_rsrc RB 3626 * tree to zip->tree RB tree to expose. */ 3627 dir = (struct zip_entry *) 3628 __archive_rb_tree_find_node(&zip->tree_rsrc, str.s); 3629 if (dir == NULL) 3630 break; 3631 __archive_rb_tree_remove_node(&zip->tree_rsrc, &dir->node); 3632 archive_string_free(&dir->rsrcname); 3633 __archive_rb_tree_insert_node(&zip->tree, &dir->node); 3634 } 3635 archive_string_free(&str); 3636} 3637 3638static int 3639slurp_central_directory(struct archive_read *a, struct archive_entry* entry, 3640 struct zip *zip) 3641{ 3642 ssize_t i; 3643 unsigned found; 3644 int64_t correction; 3645 ssize_t bytes_avail; 3646 const char *p; 3647 3648 /* 3649 * Find the start of the central directory. The end-of-CD 3650 * record has our starting point, but there are lots of 3651 * Zip archives which have had other data prepended to the 3652 * file, which makes the recorded offsets all too small. 3653 * So we search forward from the specified offset until we 3654 * find the real start of the central directory. Then we 3655 * know the correction we need to apply to account for leading 3656 * padding. 3657 */ 3658 if (__archive_read_seek(a, zip->central_directory_offset, SEEK_SET) < 0) 3659 return ARCHIVE_FATAL; 3660 3661 found = 0; 3662 while (!found) { 3663 if ((p = __archive_read_ahead(a, 20, &bytes_avail)) == NULL) 3664 return ARCHIVE_FATAL; 3665 for (found = 0, i = 0; !found && i < bytes_avail - 4;) { 3666 switch (p[i + 3]) { 3667 case 'P': i += 3; break; 3668 case 'K': i += 2; break; 3669 case 001: i += 1; break; 3670 case 002: 3671 if (memcmp(p + i, "PK\001\002", 4) == 0) { 3672 p += i; 3673 found = 1; 3674 } else 3675 i += 4; 3676 break; 3677 case 005: i += 1; break; 3678 case 006: 3679 if (memcmp(p + i, "PK\005\006", 4) == 0) { 3680 p += i; 3681 found = 1; 3682 } else if (memcmp(p + i, "PK\006\006", 4) == 0) { 3683 p += i; 3684 found = 1; 3685 } else 3686 i += 1; 3687 break; 3688 default: i += 4; break; 3689 } 3690 } 3691 __archive_read_consume(a, i); 3692 } 3693 correction = archive_filter_bytes(&a->archive, 0) 3694 - zip->central_directory_offset; 3695 3696 __archive_rb_tree_init(&zip->tree, &rb_ops); 3697 __archive_rb_tree_init(&zip->tree_rsrc, &rb_rsrc_ops); 3698 3699 zip->central_directory_entries_total = 0; 3700 while (1) { 3701 struct zip_entry *zip_entry; 3702 size_t filename_length, extra_length, comment_length; 3703 uint32_t external_attributes; 3704 const char *name, *r; 3705 3706 if ((p = __archive_read_ahead(a, 4, NULL)) == NULL) 3707 return ARCHIVE_FATAL; 3708 if (memcmp(p, "PK\006\006", 4) == 0 3709 || memcmp(p, "PK\005\006", 4) == 0) { 3710 break; 3711 } else if (memcmp(p, "PK\001\002", 4) != 0) { 3712 archive_set_error(&a->archive, 3713 -1, "Invalid central directory signature"); 3714 return ARCHIVE_FATAL; 3715 } 3716 if ((p = __archive_read_ahead(a, 46, NULL)) == NULL) 3717 return ARCHIVE_FATAL; 3718 3719 zip_entry = calloc(1, sizeof(struct zip_entry)); 3720 if (zip_entry == NULL) { 3721 archive_set_error(&a->archive, ENOMEM, 3722 "Can't allocate zip entry"); 3723 return ARCHIVE_FATAL; 3724 } 3725 zip_entry->next = zip->zip_entries; 3726 zip_entry->flags |= LA_FROM_CENTRAL_DIRECTORY; 3727 zip->zip_entries = zip_entry; 3728 zip->central_directory_entries_total++; 3729 3730 /* version = p[4]; */ 3731 zip_entry->system = p[5]; 3732 /* version_required = archive_le16dec(p + 6); */ 3733 zip_entry->zip_flags = archive_le16dec(p + 8); 3734 if (zip_entry->zip_flags 3735 & (ZIP_ENCRYPTED | ZIP_STRONG_ENCRYPTED)){ 3736 zip->has_encrypted_entries = 1; 3737 } 3738 zip_entry->compression = (char)archive_le16dec(p + 10); 3739 zip_entry->mtime = zip_time(p + 12); 3740 zip_entry->crc32 = archive_le32dec(p + 16); 3741 if (zip_entry->zip_flags & ZIP_LENGTH_AT_END) 3742 zip_entry->decdat = p[13]; 3743 else 3744 zip_entry->decdat = p[19]; 3745 zip_entry->compressed_size = archive_le32dec(p + 20); 3746 zip_entry->uncompressed_size = archive_le32dec(p + 24); 3747 filename_length = archive_le16dec(p + 28); 3748 extra_length = archive_le16dec(p + 30); 3749 comment_length = archive_le16dec(p + 32); 3750 /* disk_start = archive_le16dec(p + 34); 3751 * Better be zero. 3752 * internal_attributes = archive_le16dec(p + 36); 3753 * text bit */ 3754 external_attributes = archive_le32dec(p + 38); 3755 zip_entry->local_header_offset = 3756 archive_le32dec(p + 42) + correction; 3757 3758 /* If we can't guess the mode, leave it zero here; 3759 when we read the local file header we might get 3760 more information. */ 3761 if (zip_entry->system == 3) { 3762 zip_entry->mode = external_attributes >> 16; 3763 } else if (zip_entry->system == 0) { 3764 // Interpret MSDOS directory bit 3765 if (0x10 == (external_attributes & 0x10)) { 3766 zip_entry->mode = AE_IFDIR | 0775; 3767 } else { 3768 zip_entry->mode = AE_IFREG | 0664; 3769 } 3770 if (0x01 == (external_attributes & 0x01)) { 3771 // Read-only bit; strip write permissions 3772 zip_entry->mode &= 0555; 3773 } 3774 } else { 3775 zip_entry->mode = 0; 3776 } 3777 3778 /* We're done with the regular data; get the filename and 3779 * extra data. */ 3780 __archive_read_consume(a, 46); 3781 p = __archive_read_ahead(a, filename_length + extra_length, 3782 NULL); 3783 if (p == NULL) { 3784 archive_set_error(&a->archive, 3785 ARCHIVE_ERRNO_FILE_FORMAT, 3786 "Truncated ZIP file header"); 3787 return ARCHIVE_FATAL; 3788 } 3789 if (ARCHIVE_OK != process_extra(a, entry, p + filename_length, 3790 extra_length, zip_entry)) { 3791 return ARCHIVE_FATAL; 3792 } 3793 3794 /* 3795 * Mac resource fork files are stored under the 3796 * "__MACOSX/" directory, so we should check if 3797 * it is. 3798 */ 3799 if (!zip->process_mac_extensions) { 3800 /* Treat every entry as a regular entry. */ 3801 __archive_rb_tree_insert_node(&zip->tree, 3802 &zip_entry->node); 3803 } else { 3804 name = p; 3805 r = rsrc_basename(name, filename_length); 3806 if (filename_length >= 9 && 3807 strncmp("__MACOSX/", name, 9) == 0) { 3808 /* If this file is not a resource fork nor 3809 * a directory. We should treat it as a non 3810 * resource fork file to expose it. */ 3811 if (name[filename_length-1] != '/' && 3812 (r - name < 3 || r[0] != '.' || 3813 r[1] != '_')) { 3814 __archive_rb_tree_insert_node( 3815 &zip->tree, &zip_entry->node); 3816 /* Expose its parent directories. */ 3817 expose_parent_dirs(zip, name, 3818 filename_length); 3819 } else { 3820 /* This file is a resource fork file or 3821 * a directory. */ 3822 archive_strncpy(&(zip_entry->rsrcname), 3823 name, filename_length); 3824 __archive_rb_tree_insert_node( 3825 &zip->tree_rsrc, &zip_entry->node); 3826 } 3827 } else { 3828 /* Generate resource fork name to find its 3829 * resource file at zip->tree_rsrc. */ 3830 archive_strcpy(&(zip_entry->rsrcname), 3831 "__MACOSX/"); 3832 archive_strncat(&(zip_entry->rsrcname), 3833 name, r - name); 3834 archive_strcat(&(zip_entry->rsrcname), "._"); 3835 archive_strncat(&(zip_entry->rsrcname), 3836 name + (r - name), 3837 filename_length - (r - name)); 3838 /* Register an entry to RB tree to sort it by 3839 * file offset. */ 3840 __archive_rb_tree_insert_node(&zip->tree, 3841 &zip_entry->node); 3842 } 3843 } 3844 3845 /* Skip the comment too ... */ 3846 __archive_read_consume(a, 3847 filename_length + extra_length + comment_length); 3848 } 3849 3850 return ARCHIVE_OK; 3851} 3852 3853static ssize_t 3854zip_get_local_file_header_size(struct archive_read *a, size_t extra) 3855{ 3856 const char *p; 3857 ssize_t filename_length, extra_length; 3858 3859 if ((p = __archive_read_ahead(a, extra + 30, NULL)) == NULL) { 3860 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 3861 "Truncated ZIP file header"); 3862 return (ARCHIVE_WARN); 3863 } 3864 p += extra; 3865 3866 if (memcmp(p, "PK\003\004", 4) != 0) { 3867 archive_set_error(&a->archive, -1, "Damaged Zip archive"); 3868 return ARCHIVE_WARN; 3869 } 3870 filename_length = archive_le16dec(p + 26); 3871 extra_length = archive_le16dec(p + 28); 3872 3873 return (30 + filename_length + extra_length); 3874} 3875 3876static int 3877zip_read_mac_metadata(struct archive_read *a, struct archive_entry *entry, 3878 struct zip_entry *rsrc) 3879{ 3880 struct zip *zip = (struct zip *)a->format->data; 3881 unsigned char *metadata, *mp; 3882 int64_t offset = archive_filter_bytes(&a->archive, 0); 3883 size_t remaining_bytes, metadata_bytes; 3884 ssize_t hsize; 3885 int ret = ARCHIVE_OK, eof; 3886 3887 switch(rsrc->compression) { 3888 case 0: /* No compression. */ 3889 if (rsrc->uncompressed_size != rsrc->compressed_size) { 3890 archive_set_error(&a->archive, 3891 ARCHIVE_ERRNO_FILE_FORMAT, 3892 "Malformed OS X metadata entry: " 3893 "inconsistent size"); 3894 return (ARCHIVE_FATAL); 3895 } 3896#ifdef HAVE_ZLIB_H 3897 case 8: /* Deflate compression. */ 3898#endif 3899 break; 3900 default: /* Unsupported compression. */ 3901 /* Return a warning. */ 3902 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 3903 "Unsupported ZIP compression method (%s)", 3904 compression_name(rsrc->compression)); 3905 /* We can't decompress this entry, but we will 3906 * be able to skip() it and try the next entry. */ 3907 return (ARCHIVE_WARN); 3908 } 3909 3910 if (rsrc->uncompressed_size > (4 * 1024 * 1024)) { 3911 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 3912 "Mac metadata is too large: %jd > 4M bytes", 3913 (intmax_t)rsrc->uncompressed_size); 3914 return (ARCHIVE_WARN); 3915 } 3916 if (rsrc->compressed_size > (4 * 1024 * 1024)) { 3917 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 3918 "Mac metadata is too large: %jd > 4M bytes", 3919 (intmax_t)rsrc->compressed_size); 3920 return (ARCHIVE_WARN); 3921 } 3922 3923 metadata = malloc((size_t)rsrc->uncompressed_size); 3924 if (metadata == NULL) { 3925 archive_set_error(&a->archive, ENOMEM, 3926 "Can't allocate memory for Mac metadata"); 3927 return (ARCHIVE_FATAL); 3928 } 3929 3930 if (offset < rsrc->local_header_offset) 3931 __archive_read_consume(a, rsrc->local_header_offset - offset); 3932 else if (offset != rsrc->local_header_offset) { 3933 __archive_read_seek(a, rsrc->local_header_offset, SEEK_SET); 3934 } 3935 3936 hsize = zip_get_local_file_header_size(a, 0); 3937 __archive_read_consume(a, hsize); 3938 3939 remaining_bytes = (size_t)rsrc->compressed_size; 3940 metadata_bytes = (size_t)rsrc->uncompressed_size; 3941 mp = metadata; 3942 eof = 0; 3943 while (!eof && remaining_bytes) { 3944 const unsigned char *p; 3945 ssize_t bytes_avail; 3946 size_t bytes_used; 3947 3948 p = __archive_read_ahead(a, 1, &bytes_avail); 3949 if (p == NULL) { 3950 archive_set_error(&a->archive, 3951 ARCHIVE_ERRNO_FILE_FORMAT, 3952 "Truncated ZIP file header"); 3953 ret = ARCHIVE_WARN; 3954 goto exit_mac_metadata; 3955 } 3956 if ((size_t)bytes_avail > remaining_bytes) 3957 bytes_avail = remaining_bytes; 3958 switch(rsrc->compression) { 3959 case 0: /* No compression. */ 3960 if ((size_t)bytes_avail > metadata_bytes) 3961 bytes_avail = metadata_bytes; 3962 memcpy(mp, p, bytes_avail); 3963 bytes_used = (size_t)bytes_avail; 3964 metadata_bytes -= bytes_used; 3965 mp += bytes_used; 3966 if (metadata_bytes == 0) 3967 eof = 1; 3968 break; 3969#ifdef HAVE_ZLIB_H 3970 case 8: /* Deflate compression. */ 3971 { 3972 int r; 3973 3974 ret = zip_deflate_init(a, zip); 3975 if (ret != ARCHIVE_OK) 3976 goto exit_mac_metadata; 3977 zip->stream.next_in = 3978 (Bytef *)(uintptr_t)(const void *)p; 3979 zip->stream.avail_in = (uInt)bytes_avail; 3980 zip->stream.total_in = 0; 3981 zip->stream.next_out = mp; 3982 zip->stream.avail_out = (uInt)metadata_bytes; 3983 zip->stream.total_out = 0; 3984 3985 r = inflate(&zip->stream, 0); 3986 switch (r) { 3987 case Z_OK: 3988 break; 3989 case Z_STREAM_END: 3990 eof = 1; 3991 break; 3992 case Z_MEM_ERROR: 3993 archive_set_error(&a->archive, ENOMEM, 3994 "Out of memory for ZIP decompression"); 3995 ret = ARCHIVE_FATAL; 3996 goto exit_mac_metadata; 3997 default: 3998 archive_set_error(&a->archive, 3999 ARCHIVE_ERRNO_MISC, 4000 "ZIP decompression failed (%d)", r); 4001 ret = ARCHIVE_FATAL; 4002 goto exit_mac_metadata; 4003 } 4004 bytes_used = zip->stream.total_in; 4005 metadata_bytes -= zip->stream.total_out; 4006 mp += zip->stream.total_out; 4007 break; 4008 } 4009#endif 4010 default: 4011 bytes_used = 0; 4012 break; 4013 } 4014 __archive_read_consume(a, bytes_used); 4015 remaining_bytes -= bytes_used; 4016 } 4017 archive_entry_copy_mac_metadata(entry, metadata, 4018 (size_t)rsrc->uncompressed_size - metadata_bytes); 4019 4020exit_mac_metadata: 4021 __archive_read_seek(a, offset, SEEK_SET); 4022 zip->decompress_init = 0; 4023 free(metadata); 4024 return (ret); 4025} 4026 4027static int 4028archive_read_format_zip_seekable_read_header(struct archive_read *a, 4029 struct archive_entry *entry) 4030{ 4031 struct zip *zip = (struct zip *)a->format->data; 4032 struct zip_entry *rsrc; 4033 int64_t offset; 4034 int r, ret = ARCHIVE_OK; 4035 4036 /* 4037 * It should be sufficient to call archive_read_next_header() for 4038 * a reader to determine if an entry is encrypted or not. If the 4039 * encryption of an entry is only detectable when calling 4040 * archive_read_data(), so be it. We'll do the same check there 4041 * as well. 4042 */ 4043 if (zip->has_encrypted_entries == 4044 ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) 4045 zip->has_encrypted_entries = 0; 4046 4047 a->archive.archive_format = ARCHIVE_FORMAT_ZIP; 4048 if (a->archive.archive_format_name == NULL) 4049 a->archive.archive_format_name = "ZIP"; 4050 4051 if (zip->zip_entries == NULL) { 4052 r = slurp_central_directory(a, entry, zip); 4053 if (r != ARCHIVE_OK) 4054 return r; 4055 /* Get first entry whose local header offset is lower than 4056 * other entries in the archive file. */ 4057 zip->entry = 4058 (struct zip_entry *)ARCHIVE_RB_TREE_MIN(&zip->tree); 4059 } else if (zip->entry != NULL) { 4060 /* Get next entry in local header offset order. */ 4061 zip->entry = (struct zip_entry *)__archive_rb_tree_iterate( 4062 &zip->tree, &zip->entry->node, ARCHIVE_RB_DIR_RIGHT); 4063 } 4064 4065 if (zip->entry == NULL) 4066 return ARCHIVE_EOF; 4067 4068 if (zip->entry->rsrcname.s) 4069 rsrc = (struct zip_entry *)__archive_rb_tree_find_node( 4070 &zip->tree_rsrc, zip->entry->rsrcname.s); 4071 else 4072 rsrc = NULL; 4073 4074 if (zip->cctx_valid) 4075 archive_decrypto_aes_ctr_release(&zip->cctx); 4076 if (zip->hctx_valid) 4077 archive_hmac_sha1_cleanup(&zip->hctx); 4078 zip->tctx_valid = zip->cctx_valid = zip->hctx_valid = 0; 4079 __archive_read_reset_passphrase(a); 4080 4081 /* File entries are sorted by the header offset, we should mostly 4082 * use __archive_read_consume to advance a read point to avoid 4083 * redundant data reading. */ 4084 offset = archive_filter_bytes(&a->archive, 0); 4085 if (offset < zip->entry->local_header_offset) 4086 __archive_read_consume(a, 4087 zip->entry->local_header_offset - offset); 4088 else if (offset != zip->entry->local_header_offset) { 4089 __archive_read_seek(a, zip->entry->local_header_offset, 4090 SEEK_SET); 4091 } 4092 zip->unconsumed = 0; 4093 r = zip_read_local_file_header(a, entry, zip); 4094 if (r != ARCHIVE_OK) 4095 return r; 4096 if (rsrc) { 4097 int ret2 = zip_read_mac_metadata(a, entry, rsrc); 4098 if (ret2 < ret) 4099 ret = ret2; 4100 } 4101 return (ret); 4102} 4103 4104/* 4105 * We're going to seek for the next header anyway, so we don't 4106 * need to bother doing anything here. 4107 */ 4108static int 4109archive_read_format_zip_read_data_skip_seekable(struct archive_read *a) 4110{ 4111 struct zip *zip; 4112 zip = (struct zip *)(a->format->data); 4113 4114 zip->unconsumed = 0; 4115 return (ARCHIVE_OK); 4116} 4117 4118int 4119archive_read_support_format_zip_seekable(struct archive *_a) 4120{ 4121 struct archive_read *a = (struct archive_read *)_a; 4122 struct zip *zip; 4123 int r; 4124 4125 archive_check_magic(_a, ARCHIVE_READ_MAGIC, 4126 ARCHIVE_STATE_NEW, "archive_read_support_format_zip_seekable"); 4127 4128 zip = (struct zip *)calloc(1, sizeof(*zip)); 4129 if (zip == NULL) { 4130 archive_set_error(&a->archive, ENOMEM, 4131 "Can't allocate zip data"); 4132 return (ARCHIVE_FATAL); 4133 } 4134 4135#ifdef HAVE_COPYFILE_H 4136 /* Set this by default on Mac OS. */ 4137 zip->process_mac_extensions = 1; 4138#endif 4139 4140 /* 4141 * Until enough data has been read, we cannot tell about 4142 * any encrypted entries yet. 4143 */ 4144 zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW; 4145 zip->crc32func = real_crc32; 4146 4147 r = __archive_read_register_format(a, 4148 zip, 4149 "zip", 4150 archive_read_format_zip_seekable_bid, 4151 archive_read_format_zip_options, 4152 archive_read_format_zip_seekable_read_header, 4153 archive_read_format_zip_read_data, 4154 archive_read_format_zip_read_data_skip_seekable, 4155 NULL, 4156 archive_read_format_zip_cleanup, 4157 archive_read_support_format_zip_capabilities_seekable, 4158 archive_read_format_zip_has_encrypted_entries); 4159 4160 if (r != ARCHIVE_OK) 4161 free(zip); 4162 return (ARCHIVE_OK); 4163} 4164 4165/*# vim:set noet:*/ 4166