archive_read_support_format_zip.c revision 368708
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/10/contrib/libarchive/libarchive/archive_read_support_format_zip.c 368708 2020-12-16 22:25:40Z 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/* 903 * Auxiliary function to uncompress data chunk from zipx archive 904 * (zip with lzma compression). 905 */ 906static int 907zipx_lzma_uncompress_buffer(const char *compressed_buffer, 908 size_t compressed_buffer_size, 909 char *uncompressed_buffer, 910 size_t uncompressed_buffer_size) 911{ 912 int status = ARCHIVE_FATAL; 913 // length of 'lzma properties data' in lzma compressed 914 // data segment (stream) inside zip archive 915 const size_t lzma_params_length = 5; 916 // offset of 'lzma properties data' from the beginning of lzma stream 917 const size_t lzma_params_offset = 4; 918 // end position of 'lzma properties data' in lzma stream 919 const size_t lzma_params_end = lzma_params_offset + lzma_params_length; 920 if (compressed_buffer == NULL || 921 compressed_buffer_size < lzma_params_end || 922 uncompressed_buffer == NULL) 923 return status; 924 925 // prepare header for lzma_alone_decoder to replace zipx header 926 // (see comments in 'zipx_lzma_alone_init' for justification) 927#pragma pack(push) 928#pragma pack(1) 929 struct _alone_header 930 { 931 uint8_t bytes[5]; // lzma_params_length 932 uint64_t uncompressed_size; 933 } alone_header; 934#pragma pack(pop) 935 // copy 'lzma properties data' blob 936 memcpy(&alone_header.bytes[0], compressed_buffer + lzma_params_offset, 937 lzma_params_length); 938 alone_header.uncompressed_size = UINT64_MAX; 939 940 // prepare new compressed buffer, see 'zipx_lzma_alone_init' for details 941 const size_t lzma_alone_buffer_size = 942 compressed_buffer_size - lzma_params_end + sizeof(alone_header); 943 unsigned char *lzma_alone_compressed_buffer = 944 (unsigned char*) malloc(lzma_alone_buffer_size); 945 if (lzma_alone_compressed_buffer == NULL) 946 return status; 947 // copy lzma_alone header into new buffer 948 memcpy(lzma_alone_compressed_buffer, (void*) &alone_header, 949 sizeof(alone_header)); 950 // copy compressed data into new buffer 951 memcpy(lzma_alone_compressed_buffer + sizeof(alone_header), 952 compressed_buffer + lzma_params_end, 953 compressed_buffer_size - lzma_params_end); 954 955 // create and fill in lzma_alone_decoder stream 956 lzma_stream stream = LZMA_STREAM_INIT; 957 lzma_ret ret = lzma_alone_decoder(&stream, UINT64_MAX); 958 if (ret == LZMA_OK) 959 { 960 stream.next_in = lzma_alone_compressed_buffer; 961 stream.avail_in = lzma_alone_buffer_size; 962 stream.total_in = 0; 963 stream.next_out = (unsigned char*)uncompressed_buffer; 964 stream.avail_out = uncompressed_buffer_size; 965 stream.total_out = 0; 966 ret = lzma_code(&stream, LZMA_RUN); 967 if (ret == LZMA_OK || ret == LZMA_STREAM_END) 968 status = ARCHIVE_OK; 969 } 970 lzma_end(&stream); 971 free(lzma_alone_compressed_buffer); 972 return status; 973} 974 975/* 976 * Assumes file pointer is at beginning of local file header. 977 */ 978static int 979zip_read_local_file_header(struct archive_read *a, struct archive_entry *entry, 980 struct zip *zip) 981{ 982 const char *p; 983 const void *h; 984 const wchar_t *wp; 985 const char *cp; 986 size_t len, filename_length, extra_length; 987 struct archive_string_conv *sconv; 988 struct zip_entry *zip_entry = zip->entry; 989 struct zip_entry zip_entry_central_dir; 990 int ret = ARCHIVE_OK; 991 char version; 992 993 /* Save a copy of the original for consistency checks. */ 994 zip_entry_central_dir = *zip_entry; 995 996 zip->decompress_init = 0; 997 zip->end_of_entry = 0; 998 zip->entry_uncompressed_bytes_read = 0; 999 zip->entry_compressed_bytes_read = 0; 1000 zip->entry_crc32 = zip->crc32func(0, NULL, 0); 1001 1002 /* Setup default conversion. */ 1003 if (zip->sconv == NULL && !zip->init_default_conversion) { 1004 zip->sconv_default = 1005 archive_string_default_conversion_for_read(&(a->archive)); 1006 zip->init_default_conversion = 1; 1007 } 1008 1009 if ((p = __archive_read_ahead(a, 30, NULL)) == NULL) { 1010 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1011 "Truncated ZIP file header"); 1012 return (ARCHIVE_FATAL); 1013 } 1014 1015 if (memcmp(p, "PK\003\004", 4) != 0) { 1016 archive_set_error(&a->archive, -1, "Damaged Zip archive"); 1017 return ARCHIVE_FATAL; 1018 } 1019 version = p[4]; 1020 zip_entry->system = p[5]; 1021 zip_entry->zip_flags = archive_le16dec(p + 6); 1022 if (zip_entry->zip_flags & (ZIP_ENCRYPTED | ZIP_STRONG_ENCRYPTED)) { 1023 zip->has_encrypted_entries = 1; 1024 archive_entry_set_is_data_encrypted(entry, 1); 1025 if (zip_entry->zip_flags & ZIP_CENTRAL_DIRECTORY_ENCRYPTED && 1026 zip_entry->zip_flags & ZIP_ENCRYPTED && 1027 zip_entry->zip_flags & ZIP_STRONG_ENCRYPTED) { 1028 archive_entry_set_is_metadata_encrypted(entry, 1); 1029 return ARCHIVE_FATAL; 1030 } 1031 } 1032 zip->init_decryption = (zip_entry->zip_flags & ZIP_ENCRYPTED); 1033 zip_entry->compression = (char)archive_le16dec(p + 8); 1034 zip_entry->mtime = zip_time(p + 10); 1035 zip_entry->crc32 = archive_le32dec(p + 14); 1036 if (zip_entry->zip_flags & ZIP_LENGTH_AT_END) 1037 zip_entry->decdat = p[11]; 1038 else 1039 zip_entry->decdat = p[17]; 1040 zip_entry->compressed_size = archive_le32dec(p + 18); 1041 zip_entry->uncompressed_size = archive_le32dec(p + 22); 1042 filename_length = archive_le16dec(p + 26); 1043 extra_length = archive_le16dec(p + 28); 1044 1045 __archive_read_consume(a, 30); 1046 1047 /* Read the filename. */ 1048 if ((h = __archive_read_ahead(a, filename_length, NULL)) == NULL) { 1049 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1050 "Truncated ZIP file header"); 1051 return (ARCHIVE_FATAL); 1052 } 1053 if (zip_entry->zip_flags & ZIP_UTF8_NAME) { 1054 /* The filename is stored to be UTF-8. */ 1055 if (zip->sconv_utf8 == NULL) { 1056 zip->sconv_utf8 = 1057 archive_string_conversion_from_charset( 1058 &a->archive, "UTF-8", 1); 1059 if (zip->sconv_utf8 == NULL) 1060 return (ARCHIVE_FATAL); 1061 } 1062 sconv = zip->sconv_utf8; 1063 } else if (zip->sconv != NULL) 1064 sconv = zip->sconv; 1065 else 1066 sconv = zip->sconv_default; 1067 1068 if (archive_entry_copy_pathname_l(entry, 1069 h, filename_length, sconv) != 0) { 1070 if (errno == ENOMEM) { 1071 archive_set_error(&a->archive, ENOMEM, 1072 "Can't allocate memory for Pathname"); 1073 return (ARCHIVE_FATAL); 1074 } 1075 archive_set_error(&a->archive, 1076 ARCHIVE_ERRNO_FILE_FORMAT, 1077 "Pathname cannot be converted " 1078 "from %s to current locale.", 1079 archive_string_conversion_charset_name(sconv)); 1080 ret = ARCHIVE_WARN; 1081 } 1082 __archive_read_consume(a, filename_length); 1083 1084 /* Read the extra data. */ 1085 if ((h = __archive_read_ahead(a, extra_length, NULL)) == NULL) { 1086 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1087 "Truncated ZIP file header"); 1088 return (ARCHIVE_FATAL); 1089 } 1090 1091 if (ARCHIVE_OK != process_extra(a, entry, h, extra_length, 1092 zip_entry)) { 1093 return ARCHIVE_FATAL; 1094 } 1095 __archive_read_consume(a, extra_length); 1096 1097 /* Work around a bug in Info-Zip: When reading from a pipe, it 1098 * stats the pipe instead of synthesizing a file entry. */ 1099 if ((zip_entry->mode & AE_IFMT) == AE_IFIFO) { 1100 zip_entry->mode &= ~ AE_IFMT; 1101 zip_entry->mode |= AE_IFREG; 1102 } 1103 1104 /* If the mode is totally empty, set some sane default. */ 1105 if (zip_entry->mode == 0) { 1106 zip_entry->mode |= 0664; 1107 } 1108 1109 /* Windows archivers sometimes use backslash as the directory 1110 * separator. Normalize to slash. */ 1111 if (zip_entry->system == 0 && 1112 (wp = archive_entry_pathname_w(entry)) != NULL) { 1113 if (wcschr(wp, L'/') == NULL && wcschr(wp, L'\\') != NULL) { 1114 size_t i; 1115 struct archive_wstring s; 1116 archive_string_init(&s); 1117 archive_wstrcpy(&s, wp); 1118 for (i = 0; i < archive_strlen(&s); i++) { 1119 if (s.s[i] == '\\') 1120 s.s[i] = '/'; 1121 } 1122 archive_entry_copy_pathname_w(entry, s.s); 1123 archive_wstring_free(&s); 1124 } 1125 } 1126 1127 /* Make sure that entries with a trailing '/' are marked as directories 1128 * even if the External File Attributes contains bogus values. If this 1129 * is not a directory and there is no type, assume a regular file. */ 1130 if ((zip_entry->mode & AE_IFMT) != AE_IFDIR) { 1131 int has_slash; 1132 1133 wp = archive_entry_pathname_w(entry); 1134 if (wp != NULL) { 1135 len = wcslen(wp); 1136 has_slash = len > 0 && wp[len - 1] == L'/'; 1137 } else { 1138 cp = archive_entry_pathname(entry); 1139 len = (cp != NULL)?strlen(cp):0; 1140 has_slash = len > 0 && cp[len - 1] == '/'; 1141 } 1142 /* Correct file type as needed. */ 1143 if (has_slash) { 1144 zip_entry->mode &= ~AE_IFMT; 1145 zip_entry->mode |= AE_IFDIR; 1146 zip_entry->mode |= 0111; 1147 } else if ((zip_entry->mode & AE_IFMT) == 0) { 1148 zip_entry->mode |= AE_IFREG; 1149 } 1150 } 1151 1152 /* Make sure directories end in '/' */ 1153 if ((zip_entry->mode & AE_IFMT) == AE_IFDIR) { 1154 wp = archive_entry_pathname_w(entry); 1155 if (wp != NULL) { 1156 len = wcslen(wp); 1157 if (len > 0 && wp[len - 1] != L'/') { 1158 struct archive_wstring s; 1159 archive_string_init(&s); 1160 archive_wstrcat(&s, wp); 1161 archive_wstrappend_wchar(&s, L'/'); 1162 archive_entry_copy_pathname_w(entry, s.s); 1163 archive_wstring_free(&s); 1164 } 1165 } else { 1166 cp = archive_entry_pathname(entry); 1167 len = (cp != NULL)?strlen(cp):0; 1168 if (len > 0 && cp[len - 1] != '/') { 1169 struct archive_string s; 1170 archive_string_init(&s); 1171 archive_strcat(&s, cp); 1172 archive_strappend_char(&s, '/'); 1173 archive_entry_set_pathname(entry, s.s); 1174 archive_string_free(&s); 1175 } 1176 } 1177 } 1178 1179 if (zip_entry->flags & LA_FROM_CENTRAL_DIRECTORY) { 1180 /* If this came from the central dir, its size info 1181 * is definitive, so ignore the length-at-end flag. */ 1182 zip_entry->zip_flags &= ~ZIP_LENGTH_AT_END; 1183 /* If local header is missing a value, use the one from 1184 the central directory. If both have it, warn about 1185 mismatches. */ 1186 if (zip_entry->crc32 == 0) { 1187 zip_entry->crc32 = zip_entry_central_dir.crc32; 1188 } else if (!zip->ignore_crc32 1189 && zip_entry->crc32 != zip_entry_central_dir.crc32) { 1190 archive_set_error(&a->archive, 1191 ARCHIVE_ERRNO_FILE_FORMAT, 1192 "Inconsistent CRC32 values"); 1193 ret = ARCHIVE_WARN; 1194 } 1195 if (zip_entry->compressed_size == 0) { 1196 zip_entry->compressed_size 1197 = zip_entry_central_dir.compressed_size; 1198 } else if (zip_entry->compressed_size 1199 != zip_entry_central_dir.compressed_size) { 1200 archive_set_error(&a->archive, 1201 ARCHIVE_ERRNO_FILE_FORMAT, 1202 "Inconsistent compressed size: " 1203 "%jd in central directory, %jd in local header", 1204 (intmax_t)zip_entry_central_dir.compressed_size, 1205 (intmax_t)zip_entry->compressed_size); 1206 ret = ARCHIVE_WARN; 1207 } 1208 if (zip_entry->uncompressed_size == 0) { 1209 zip_entry->uncompressed_size 1210 = zip_entry_central_dir.uncompressed_size; 1211 } else if (zip_entry->uncompressed_size 1212 != zip_entry_central_dir.uncompressed_size) { 1213 archive_set_error(&a->archive, 1214 ARCHIVE_ERRNO_FILE_FORMAT, 1215 "Inconsistent uncompressed size: " 1216 "%jd in central directory, %jd in local header", 1217 (intmax_t)zip_entry_central_dir.uncompressed_size, 1218 (intmax_t)zip_entry->uncompressed_size); 1219 ret = ARCHIVE_WARN; 1220 } 1221 } 1222 1223 /* Populate some additional entry fields: */ 1224 archive_entry_set_mode(entry, zip_entry->mode); 1225 archive_entry_set_uid(entry, zip_entry->uid); 1226 archive_entry_set_gid(entry, zip_entry->gid); 1227 archive_entry_set_mtime(entry, zip_entry->mtime, 0); 1228 archive_entry_set_ctime(entry, zip_entry->ctime, 0); 1229 archive_entry_set_atime(entry, zip_entry->atime, 0); 1230 1231 if ((zip->entry->mode & AE_IFMT) == AE_IFLNK) { 1232 size_t linkname_length; 1233 1234 if (zip_entry->compressed_size > 64 * 1024) { 1235 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1236 "Zip file with oversized link entry"); 1237 return ARCHIVE_FATAL; 1238 } 1239 1240 linkname_length = (size_t)zip_entry->compressed_size; 1241 1242 archive_entry_set_size(entry, 0); 1243 p = __archive_read_ahead(a, linkname_length, NULL); 1244 if (p == NULL) { 1245 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1246 "Truncated Zip file"); 1247 return ARCHIVE_FATAL; 1248 } 1249 // take into account link compression if any 1250 size_t linkname_full_length = linkname_length; 1251 if (zip->entry->compression != 0) 1252 { 1253 // symlink target string appeared to be compressed 1254 int status = ARCHIVE_FATAL; 1255 char *uncompressed_buffer = 1256 (char*) malloc(zip_entry->uncompressed_size); 1257 if (uncompressed_buffer == NULL) 1258 { 1259 archive_set_error(&a->archive, ENOMEM, 1260 "No memory for lzma decompression"); 1261 return status; 1262 } 1263 1264 switch (zip->entry->compression) 1265 { 1266#if HAVE_LZMA_H && HAVE_LIBLZMA 1267 case 14: /* ZIPx LZMA compression. */ 1268 /*(see zip file format specification, section 4.4.5)*/ 1269 status = zipx_lzma_uncompress_buffer(p, 1270 linkname_length, 1271 uncompressed_buffer, 1272 (size_t)zip_entry->uncompressed_size); 1273 break; 1274#endif 1275 default: /* Unsupported compression. */ 1276 break; 1277 } 1278 if (status == ARCHIVE_OK) 1279 { 1280 p = uncompressed_buffer; 1281 linkname_full_length = 1282 (size_t)zip_entry->uncompressed_size; 1283 } 1284 else 1285 { 1286 archive_set_error(&a->archive, 1287 ARCHIVE_ERRNO_FILE_FORMAT, 1288 "Unsupported ZIP compression method " 1289 "during decompression of link entry (%d: %s)", 1290 zip->entry->compression, 1291 compression_name(zip->entry->compression)); 1292 return ARCHIVE_FAILED; 1293 } 1294 } 1295 1296 sconv = zip->sconv; 1297 if (sconv == NULL && (zip->entry->zip_flags & ZIP_UTF8_NAME)) 1298 sconv = zip->sconv_utf8; 1299 if (sconv == NULL) 1300 sconv = zip->sconv_default; 1301 if (archive_entry_copy_symlink_l(entry, p, linkname_full_length, 1302 sconv) != 0) { 1303 if (errno != ENOMEM && sconv == zip->sconv_utf8 && 1304 (zip->entry->zip_flags & ZIP_UTF8_NAME)) 1305 archive_entry_copy_symlink_l(entry, p, 1306 linkname_full_length, NULL); 1307 if (errno == ENOMEM) { 1308 archive_set_error(&a->archive, ENOMEM, 1309 "Can't allocate memory for Symlink"); 1310 return (ARCHIVE_FATAL); 1311 } 1312 /* 1313 * Since there is no character-set regulation for 1314 * symlink name, do not report the conversion error 1315 * in an automatic conversion. 1316 */ 1317 if (sconv != zip->sconv_utf8 || 1318 (zip->entry->zip_flags & ZIP_UTF8_NAME) == 0) { 1319 archive_set_error(&a->archive, 1320 ARCHIVE_ERRNO_FILE_FORMAT, 1321 "Symlink cannot be converted " 1322 "from %s to current locale.", 1323 archive_string_conversion_charset_name( 1324 sconv)); 1325 ret = ARCHIVE_WARN; 1326 } 1327 } 1328 zip_entry->uncompressed_size = zip_entry->compressed_size = 0; 1329 1330 if (__archive_read_consume(a, linkname_length) < 0) { 1331 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1332 "Read error skipping symlink target name"); 1333 return ARCHIVE_FATAL; 1334 } 1335 } else if (0 == (zip_entry->zip_flags & ZIP_LENGTH_AT_END) 1336 || zip_entry->uncompressed_size > 0) { 1337 /* Set the size only if it's meaningful. */ 1338 archive_entry_set_size(entry, zip_entry->uncompressed_size); 1339 } 1340 zip->entry_bytes_remaining = zip_entry->compressed_size; 1341 1342 /* If there's no body, force read_data() to return EOF immediately. */ 1343 if (0 == (zip_entry->zip_flags & ZIP_LENGTH_AT_END) 1344 && zip->entry_bytes_remaining < 1) 1345 zip->end_of_entry = 1; 1346 1347 /* Set up a more descriptive format name. */ 1348 archive_string_empty(&zip->format_name); 1349 archive_string_sprintf(&zip->format_name, "ZIP %d.%d (%s)", 1350 version / 10, version % 10, 1351 compression_name(zip->entry->compression)); 1352 a->archive.archive_format_name = zip->format_name.s; 1353 1354 return (ret); 1355} 1356 1357static int 1358check_authentication_code(struct archive_read *a, const void *_p) 1359{ 1360 struct zip *zip = (struct zip *)(a->format->data); 1361 1362 /* Check authentication code. */ 1363 if (zip->hctx_valid) { 1364 const void *p; 1365 uint8_t hmac[20]; 1366 size_t hmac_len = 20; 1367 int cmp; 1368 1369 archive_hmac_sha1_final(&zip->hctx, hmac, &hmac_len); 1370 if (_p == NULL) { 1371 /* Read authentication code. */ 1372 p = __archive_read_ahead(a, AUTH_CODE_SIZE, NULL); 1373 if (p == NULL) { 1374 archive_set_error(&a->archive, 1375 ARCHIVE_ERRNO_FILE_FORMAT, 1376 "Truncated ZIP file data"); 1377 return (ARCHIVE_FATAL); 1378 } 1379 } else { 1380 p = _p; 1381 } 1382 cmp = memcmp(hmac, p, AUTH_CODE_SIZE); 1383 __archive_read_consume(a, AUTH_CODE_SIZE); 1384 if (cmp != 0) { 1385 archive_set_error(&a->archive, 1386 ARCHIVE_ERRNO_MISC, 1387 "ZIP bad Authentication code"); 1388 return (ARCHIVE_WARN); 1389 } 1390 } 1391 return (ARCHIVE_OK); 1392} 1393 1394/* 1395 * Read "uncompressed" data. There are three cases: 1396 * 1) We know the size of the data. This is always true for the 1397 * seeking reader (we've examined the Central Directory already). 1398 * 2) ZIP_LENGTH_AT_END was set, but only the CRC was deferred. 1399 * Info-ZIP seems to do this; we know the size but have to grab 1400 * the CRC from the data descriptor afterwards. 1401 * 3) We're streaming and ZIP_LENGTH_AT_END was specified and 1402 * we have no size information. In this case, we can do pretty 1403 * well by watching for the data descriptor record. The data 1404 * descriptor is 16 bytes and includes a computed CRC that should 1405 * provide a strong check. 1406 * 1407 * TODO: Technically, the PK\007\010 signature is optional. 1408 * In the original spec, the data descriptor contained CRC 1409 * and size fields but had no leading signature. In practice, 1410 * newer writers seem to provide the signature pretty consistently. 1411 * 1412 * For uncompressed data, the PK\007\010 marker seems essential 1413 * to be sure we've actually seen the end of the entry. 1414 * 1415 * Returns ARCHIVE_OK if successful, ARCHIVE_FATAL otherwise, sets 1416 * zip->end_of_entry if it consumes all of the data. 1417 */ 1418static int 1419zip_read_data_none(struct archive_read *a, const void **_buff, 1420 size_t *size, int64_t *offset) 1421{ 1422 struct zip *zip; 1423 const char *buff; 1424 ssize_t bytes_avail; 1425 int r; 1426 1427 (void)offset; /* UNUSED */ 1428 1429 zip = (struct zip *)(a->format->data); 1430 1431 if (zip->entry->zip_flags & ZIP_LENGTH_AT_END) { 1432 const char *p; 1433 ssize_t grabbing_bytes = 24; 1434 1435 if (zip->hctx_valid) 1436 grabbing_bytes += AUTH_CODE_SIZE; 1437 /* Grab at least 24 bytes. */ 1438 buff = __archive_read_ahead(a, grabbing_bytes, &bytes_avail); 1439 if (bytes_avail < grabbing_bytes) { 1440 /* Zip archives have end-of-archive markers 1441 that are longer than this, so a failure to get at 1442 least 24 bytes really does indicate a truncated 1443 file. */ 1444 archive_set_error(&a->archive, 1445 ARCHIVE_ERRNO_FILE_FORMAT, 1446 "Truncated ZIP file data"); 1447 return (ARCHIVE_FATAL); 1448 } 1449 /* Check for a complete PK\007\010 signature, followed 1450 * by the correct 4-byte CRC. */ 1451 p = buff; 1452 if (zip->hctx_valid) 1453 p += AUTH_CODE_SIZE; 1454 if (p[0] == 'P' && p[1] == 'K' 1455 && p[2] == '\007' && p[3] == '\010' 1456 && (archive_le32dec(p + 4) == zip->entry_crc32 1457 || zip->ignore_crc32 1458 || (zip->hctx_valid 1459 && zip->entry->aes_extra.vendor == AES_VENDOR_AE_2))) { 1460 if (zip->entry->flags & LA_USED_ZIP64) { 1461 uint64_t compressed, uncompressed; 1462 zip->entry->crc32 = archive_le32dec(p + 4); 1463 compressed = archive_le64dec(p + 8); 1464 uncompressed = archive_le64dec(p + 16); 1465 if (compressed > INT64_MAX || uncompressed > 1466 INT64_MAX) { 1467 archive_set_error(&a->archive, 1468 ARCHIVE_ERRNO_FILE_FORMAT, 1469 "Overflow of 64-bit file sizes"); 1470 return ARCHIVE_FAILED; 1471 } 1472 zip->entry->compressed_size = compressed; 1473 zip->entry->uncompressed_size = uncompressed; 1474 zip->unconsumed = 24; 1475 } else { 1476 zip->entry->crc32 = archive_le32dec(p + 4); 1477 zip->entry->compressed_size = 1478 archive_le32dec(p + 8); 1479 zip->entry->uncompressed_size = 1480 archive_le32dec(p + 12); 1481 zip->unconsumed = 16; 1482 } 1483 if (zip->hctx_valid) { 1484 r = check_authentication_code(a, buff); 1485 if (r != ARCHIVE_OK) 1486 return (r); 1487 } 1488 zip->end_of_entry = 1; 1489 return (ARCHIVE_OK); 1490 } 1491 /* If not at EOF, ensure we consume at least one byte. */ 1492 ++p; 1493 1494 /* Scan forward until we see where a PK\007\010 signature 1495 * might be. */ 1496 /* Return bytes up until that point. On the next call, 1497 * the code above will verify the data descriptor. */ 1498 while (p < buff + bytes_avail - 4) { 1499 if (p[3] == 'P') { p += 3; } 1500 else if (p[3] == 'K') { p += 2; } 1501 else if (p[3] == '\007') { p += 1; } 1502 else if (p[3] == '\010' && p[2] == '\007' 1503 && p[1] == 'K' && p[0] == 'P') { 1504 if (zip->hctx_valid) 1505 p -= AUTH_CODE_SIZE; 1506 break; 1507 } else { p += 4; } 1508 } 1509 bytes_avail = p - buff; 1510 } else { 1511 if (zip->entry_bytes_remaining == 0) { 1512 zip->end_of_entry = 1; 1513 if (zip->hctx_valid) { 1514 r = check_authentication_code(a, NULL); 1515 if (r != ARCHIVE_OK) 1516 return (r); 1517 } 1518 return (ARCHIVE_OK); 1519 } 1520 /* Grab a bunch of bytes. */ 1521 buff = __archive_read_ahead(a, 1, &bytes_avail); 1522 if (bytes_avail <= 0) { 1523 archive_set_error(&a->archive, 1524 ARCHIVE_ERRNO_FILE_FORMAT, 1525 "Truncated ZIP file data"); 1526 return (ARCHIVE_FATAL); 1527 } 1528 if (bytes_avail > zip->entry_bytes_remaining) 1529 bytes_avail = (ssize_t)zip->entry_bytes_remaining; 1530 } 1531 if (zip->tctx_valid || zip->cctx_valid) { 1532 size_t dec_size = bytes_avail; 1533 1534 if (dec_size > zip->decrypted_buffer_size) 1535 dec_size = zip->decrypted_buffer_size; 1536 if (zip->tctx_valid) { 1537 trad_enc_decrypt_update(&zip->tctx, 1538 (const uint8_t *)buff, dec_size, 1539 zip->decrypted_buffer, dec_size); 1540 } else { 1541 size_t dsize = dec_size; 1542 archive_hmac_sha1_update(&zip->hctx, 1543 (const uint8_t *)buff, dec_size); 1544 archive_decrypto_aes_ctr_update(&zip->cctx, 1545 (const uint8_t *)buff, dec_size, 1546 zip->decrypted_buffer, &dsize); 1547 } 1548 bytes_avail = dec_size; 1549 buff = (const char *)zip->decrypted_buffer; 1550 } 1551 *size = bytes_avail; 1552 zip->entry_bytes_remaining -= bytes_avail; 1553 zip->entry_uncompressed_bytes_read += bytes_avail; 1554 zip->entry_compressed_bytes_read += bytes_avail; 1555 zip->unconsumed += bytes_avail; 1556 *_buff = buff; 1557 return (ARCHIVE_OK); 1558} 1559 1560static int 1561consume_optional_marker(struct archive_read *a, struct zip *zip) 1562{ 1563 if (zip->end_of_entry && (zip->entry->zip_flags & ZIP_LENGTH_AT_END)) { 1564 const char *p; 1565 1566 if (NULL == (p = __archive_read_ahead(a, 24, NULL))) { 1567 archive_set_error(&a->archive, 1568 ARCHIVE_ERRNO_FILE_FORMAT, 1569 "Truncated ZIP end-of-file record"); 1570 return (ARCHIVE_FATAL); 1571 } 1572 /* Consume the optional PK\007\010 marker. */ 1573 if (p[0] == 'P' && p[1] == 'K' && 1574 p[2] == '\007' && p[3] == '\010') { 1575 p += 4; 1576 zip->unconsumed = 4; 1577 } 1578 if (zip->entry->flags & LA_USED_ZIP64) { 1579 uint64_t compressed, uncompressed; 1580 zip->entry->crc32 = archive_le32dec(p); 1581 compressed = archive_le64dec(p + 4); 1582 uncompressed = archive_le64dec(p + 12); 1583 if (compressed > INT64_MAX || 1584 uncompressed > INT64_MAX) { 1585 archive_set_error(&a->archive, 1586 ARCHIVE_ERRNO_FILE_FORMAT, 1587 "Overflow of 64-bit file sizes"); 1588 return ARCHIVE_FAILED; 1589 } 1590 zip->entry->compressed_size = compressed; 1591 zip->entry->uncompressed_size = uncompressed; 1592 zip->unconsumed += 20; 1593 } else { 1594 zip->entry->crc32 = archive_le32dec(p); 1595 zip->entry->compressed_size = archive_le32dec(p + 4); 1596 zip->entry->uncompressed_size = archive_le32dec(p + 8); 1597 zip->unconsumed += 12; 1598 } 1599 } 1600 1601 return (ARCHIVE_OK); 1602} 1603 1604#if HAVE_LZMA_H && HAVE_LIBLZMA 1605static int 1606zipx_xz_init(struct archive_read *a, struct zip *zip) 1607{ 1608 lzma_ret r; 1609 1610 if(zip->zipx_lzma_valid) { 1611 lzma_end(&zip->zipx_lzma_stream); 1612 zip->zipx_lzma_valid = 0; 1613 } 1614 1615 memset(&zip->zipx_lzma_stream, 0, sizeof(zip->zipx_lzma_stream)); 1616 r = lzma_stream_decoder(&zip->zipx_lzma_stream, UINT64_MAX, 0); 1617 if (r != LZMA_OK) { 1618 archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC, 1619 "xz initialization failed(%d)", 1620 r); 1621 1622 return (ARCHIVE_FAILED); 1623 } 1624 1625 zip->zipx_lzma_valid = 1; 1626 1627 free(zip->uncompressed_buffer); 1628 1629 zip->uncompressed_buffer_size = 256 * 1024; 1630 zip->uncompressed_buffer = 1631 (uint8_t*) malloc(zip->uncompressed_buffer_size); 1632 if (zip->uncompressed_buffer == NULL) { 1633 archive_set_error(&a->archive, ENOMEM, 1634 "No memory for xz decompression"); 1635 return (ARCHIVE_FATAL); 1636 } 1637 1638 zip->decompress_init = 1; 1639 return (ARCHIVE_OK); 1640} 1641 1642static int 1643zipx_lzma_alone_init(struct archive_read *a, struct zip *zip) 1644{ 1645 lzma_ret r; 1646 const uint8_t* p; 1647 1648#pragma pack(push) 1649#pragma pack(1) 1650 struct _alone_header { 1651 uint8_t bytes[5]; 1652 uint64_t uncompressed_size; 1653 } alone_header; 1654#pragma pack(pop) 1655 1656 if(zip->zipx_lzma_valid) { 1657 lzma_end(&zip->zipx_lzma_stream); 1658 zip->zipx_lzma_valid = 0; 1659 } 1660 1661 /* To unpack ZIPX's "LZMA" (id 14) stream we can use standard liblzma 1662 * that is a part of XZ Utils. The stream format stored inside ZIPX 1663 * file is a modified "lzma alone" file format, that was used by the 1664 * `lzma` utility which was later deprecated in favour of `xz` utility. * Since those formats are nearly the same, we can use a standard 1665 * "lzma alone" decoder from XZ Utils. */ 1666 1667 memset(&zip->zipx_lzma_stream, 0, sizeof(zip->zipx_lzma_stream)); 1668 r = lzma_alone_decoder(&zip->zipx_lzma_stream, UINT64_MAX); 1669 if (r != LZMA_OK) { 1670 archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC, 1671 "lzma initialization failed(%d)", r); 1672 1673 return (ARCHIVE_FAILED); 1674 } 1675 1676 /* Flag the cleanup function that we want our lzma-related structures 1677 * to be freed later. */ 1678 zip->zipx_lzma_valid = 1; 1679 1680 /* The "lzma alone" file format and the stream format inside ZIPx are 1681 * almost the same. Here's an example of a structure of "lzma alone" 1682 * format: 1683 * 1684 * $ cat /bin/ls | lzma | xxd | head -n 1 1685 * 00000000: 5d00 0080 00ff ffff ffff ffff ff00 2814 1686 * 1687 * 5 bytes 8 bytes n bytes 1688 * <lzma_params><uncompressed_size><data...> 1689 * 1690 * lzma_params is a 5-byte blob that has to be decoded to extract 1691 * parameters of this LZMA stream. The uncompressed_size field is an 1692 * uint64_t value that contains information about the size of the 1693 * uncompressed file, or UINT64_MAX if this value is unknown. 1694 * The <data...> part is the actual lzma-compressed data stream. 1695 * 1696 * Now here's the structure of the stream inside the ZIPX file: 1697 * 1698 * $ cat stream_inside_zipx | xxd | head -n 1 1699 * 00000000: 0914 0500 5d00 8000 0000 2814 .... .... 1700 * 1701 * 2byte 2byte 5 bytes n bytes 1702 * <magic1><magic2><lzma_params><data...> 1703 * 1704 * This means that the ZIPX file contains an additional magic1 and 1705 * magic2 headers, the lzma_params field contains the same parameter 1706 * set as in the "lzma alone" format, and the <data...> field is the 1707 * same as in the "lzma alone" format as well. Note that also the zipx 1708 * format is missing the uncompressed_size field. 1709 * 1710 * So, in order to use the "lzma alone" decoder for the zipx lzma 1711 * stream, we simply need to shuffle around some fields, prepare a new 1712 * lzma alone header, feed it into lzma alone decoder so it will 1713 * initialize itself properly, and then we can start feeding normal 1714 * zipx lzma stream into the decoder. 1715 */ 1716 1717 /* Read magic1,magic2,lzma_params from the ZIPX stream. */ 1718 if((p = __archive_read_ahead(a, 9, NULL)) == NULL) { 1719 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1720 "Truncated lzma data"); 1721 return (ARCHIVE_FATAL); 1722 } 1723 1724 if(p[2] != 0x05 || p[3] != 0x00) { 1725 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1726 "Invalid lzma data"); 1727 return (ARCHIVE_FATAL); 1728 } 1729 1730 /* Prepare an lzma alone header: copy the lzma_params blob into 1731 * a proper place into the lzma alone header. */ 1732 memcpy(&alone_header.bytes[0], p + 4, 5); 1733 1734 /* Initialize the 'uncompressed size' field to unknown; we'll manually 1735 * monitor how many bytes there are still to be uncompressed. */ 1736 alone_header.uncompressed_size = UINT64_MAX; 1737 1738 if(!zip->uncompressed_buffer) { 1739 zip->uncompressed_buffer_size = 256 * 1024; 1740 zip->uncompressed_buffer = 1741 (uint8_t*) malloc(zip->uncompressed_buffer_size); 1742 1743 if (zip->uncompressed_buffer == NULL) { 1744 archive_set_error(&a->archive, ENOMEM, 1745 "No memory for lzma decompression"); 1746 return (ARCHIVE_FATAL); 1747 } 1748 } 1749 1750 zip->zipx_lzma_stream.next_in = (void*) &alone_header; 1751 zip->zipx_lzma_stream.avail_in = sizeof(alone_header); 1752 zip->zipx_lzma_stream.total_in = 0; 1753 zip->zipx_lzma_stream.next_out = zip->uncompressed_buffer; 1754 zip->zipx_lzma_stream.avail_out = zip->uncompressed_buffer_size; 1755 zip->zipx_lzma_stream.total_out = 0; 1756 1757 /* Feed only the header into the lzma alone decoder. This will 1758 * effectively initialize the decoder, and will not produce any 1759 * output bytes yet. */ 1760 r = lzma_code(&zip->zipx_lzma_stream, LZMA_RUN); 1761 if (r != LZMA_OK) { 1762 archive_set_error(&a->archive, ARCHIVE_ERRNO_PROGRAMMER, 1763 "lzma stream initialization error"); 1764 return ARCHIVE_FATAL; 1765 } 1766 1767 /* We've already consumed some bytes, so take this into account. */ 1768 __archive_read_consume(a, 9); 1769 zip->entry_bytes_remaining -= 9; 1770 zip->entry_compressed_bytes_read += 9; 1771 1772 zip->decompress_init = 1; 1773 return (ARCHIVE_OK); 1774} 1775 1776static int 1777zip_read_data_zipx_xz(struct archive_read *a, const void **buff, 1778 size_t *size, int64_t *offset) 1779{ 1780 struct zip* zip = (struct zip *)(a->format->data); 1781 int ret; 1782 lzma_ret lz_ret; 1783 const void* compressed_buf; 1784 ssize_t bytes_avail, in_bytes, to_consume = 0; 1785 1786 (void) offset; /* UNUSED */ 1787 1788 /* Initialize decompressor if not yet initialized. */ 1789 if (!zip->decompress_init) { 1790 ret = zipx_xz_init(a, zip); 1791 if (ret != ARCHIVE_OK) 1792 return (ret); 1793 } 1794 1795 compressed_buf = __archive_read_ahead(a, 1, &bytes_avail); 1796 if (bytes_avail < 0) { 1797 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1798 "Truncated xz file body"); 1799 return (ARCHIVE_FATAL); 1800 } 1801 1802 in_bytes = zipmin(zip->entry_bytes_remaining, bytes_avail); 1803 zip->zipx_lzma_stream.next_in = compressed_buf; 1804 zip->zipx_lzma_stream.avail_in = in_bytes; 1805 zip->zipx_lzma_stream.total_in = 0; 1806 zip->zipx_lzma_stream.next_out = zip->uncompressed_buffer; 1807 zip->zipx_lzma_stream.avail_out = zip->uncompressed_buffer_size; 1808 zip->zipx_lzma_stream.total_out = 0; 1809 1810 /* Perform the decompression. */ 1811 lz_ret = lzma_code(&zip->zipx_lzma_stream, LZMA_RUN); 1812 switch(lz_ret) { 1813 case LZMA_DATA_ERROR: 1814 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1815 "xz data error (error %d)", (int) lz_ret); 1816 return (ARCHIVE_FATAL); 1817 1818 case LZMA_NO_CHECK: 1819 case LZMA_OK: 1820 break; 1821 1822 default: 1823 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1824 "xz unknown error %d", (int) lz_ret); 1825 return (ARCHIVE_FATAL); 1826 1827 case LZMA_STREAM_END: 1828 lzma_end(&zip->zipx_lzma_stream); 1829 zip->zipx_lzma_valid = 0; 1830 1831 if((int64_t) zip->zipx_lzma_stream.total_in != 1832 zip->entry_bytes_remaining) 1833 { 1834 archive_set_error(&a->archive, 1835 ARCHIVE_ERRNO_MISC, 1836 "xz premature end of stream"); 1837 return (ARCHIVE_FATAL); 1838 } 1839 1840 zip->end_of_entry = 1; 1841 break; 1842 } 1843 1844 to_consume = zip->zipx_lzma_stream.total_in; 1845 1846 __archive_read_consume(a, to_consume); 1847 zip->entry_bytes_remaining -= to_consume; 1848 zip->entry_compressed_bytes_read += to_consume; 1849 zip->entry_uncompressed_bytes_read += zip->zipx_lzma_stream.total_out; 1850 1851 *size = zip->zipx_lzma_stream.total_out; 1852 *buff = zip->uncompressed_buffer; 1853 1854 ret = consume_optional_marker(a, zip); 1855 if (ret != ARCHIVE_OK) 1856 return (ret); 1857 1858 return (ARCHIVE_OK); 1859} 1860 1861static int 1862zip_read_data_zipx_lzma_alone(struct archive_read *a, const void **buff, 1863 size_t *size, int64_t *offset) 1864{ 1865 struct zip* zip = (struct zip *)(a->format->data); 1866 int ret; 1867 lzma_ret lz_ret; 1868 const void* compressed_buf; 1869 ssize_t bytes_avail, in_bytes, to_consume; 1870 1871 (void) offset; /* UNUSED */ 1872 1873 /* Initialize decompressor if not yet initialized. */ 1874 if (!zip->decompress_init) { 1875 ret = zipx_lzma_alone_init(a, zip); 1876 if (ret != ARCHIVE_OK) 1877 return (ret); 1878 } 1879 1880 /* Fetch more compressed data. The same note as in deflate handler 1881 * applies here as well: 1882 * 1883 * Note: '1' here is a performance optimization. Recall that the 1884 * decompression layer returns a count of available bytes; asking for 1885 * more than that forces the decompressor to combine reads by copying 1886 * data. 1887 */ 1888 compressed_buf = __archive_read_ahead(a, 1, &bytes_avail); 1889 if (bytes_avail < 0) { 1890 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1891 "Truncated lzma file body"); 1892 return (ARCHIVE_FATAL); 1893 } 1894 1895 /* Set decompressor parameters. */ 1896 in_bytes = zipmin(zip->entry_bytes_remaining, bytes_avail); 1897 1898 zip->zipx_lzma_stream.next_in = compressed_buf; 1899 zip->zipx_lzma_stream.avail_in = in_bytes; 1900 zip->zipx_lzma_stream.total_in = 0; 1901 zip->zipx_lzma_stream.next_out = zip->uncompressed_buffer; 1902 zip->zipx_lzma_stream.avail_out = 1903 /* These lzma_alone streams lack end of stream marker, so let's 1904 * make sure the unpacker won't try to unpack more than it's 1905 * supposed to. */ 1906 zipmin((int64_t) zip->uncompressed_buffer_size, 1907 zip->entry->uncompressed_size - 1908 zip->entry_uncompressed_bytes_read); 1909 zip->zipx_lzma_stream.total_out = 0; 1910 1911 /* Perform the decompression. */ 1912 lz_ret = lzma_code(&zip->zipx_lzma_stream, LZMA_RUN); 1913 switch(lz_ret) { 1914 case LZMA_DATA_ERROR: 1915 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1916 "lzma data error (error %d)", (int) lz_ret); 1917 return (ARCHIVE_FATAL); 1918 1919 /* This case is optional in lzma alone format. It can happen, 1920 * but most of the files don't have it. (GitHub #1257) */ 1921 case LZMA_STREAM_END: 1922 lzma_end(&zip->zipx_lzma_stream); 1923 zip->zipx_lzma_valid = 0; 1924 if((int64_t) zip->zipx_lzma_stream.total_in != 1925 zip->entry_bytes_remaining) 1926 { 1927 archive_set_error(&a->archive, 1928 ARCHIVE_ERRNO_MISC, 1929 "lzma alone premature end of stream"); 1930 return (ARCHIVE_FATAL); 1931 } 1932 1933 zip->end_of_entry = 1; 1934 break; 1935 1936 case LZMA_OK: 1937 break; 1938 1939 default: 1940 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1941 "lzma unknown error %d", (int) lz_ret); 1942 return (ARCHIVE_FATAL); 1943 } 1944 1945 to_consume = zip->zipx_lzma_stream.total_in; 1946 1947 /* Update pointers. */ 1948 __archive_read_consume(a, to_consume); 1949 zip->entry_bytes_remaining -= to_consume; 1950 zip->entry_compressed_bytes_read += to_consume; 1951 zip->entry_uncompressed_bytes_read += zip->zipx_lzma_stream.total_out; 1952 1953 if(zip->entry_bytes_remaining == 0) { 1954 zip->end_of_entry = 1; 1955 } 1956 1957 /* Return values. */ 1958 *size = zip->zipx_lzma_stream.total_out; 1959 *buff = zip->uncompressed_buffer; 1960 1961 /* Behave the same way as during deflate decompression. */ 1962 ret = consume_optional_marker(a, zip); 1963 if (ret != ARCHIVE_OK) 1964 return (ret); 1965 1966 /* Free lzma decoder handle because we'll no longer need it. */ 1967 if(zip->end_of_entry) { 1968 lzma_end(&zip->zipx_lzma_stream); 1969 zip->zipx_lzma_valid = 0; 1970 } 1971 1972 /* If we're here, then we're good! */ 1973 return (ARCHIVE_OK); 1974} 1975#endif /* HAVE_LZMA_H && HAVE_LIBLZMA */ 1976 1977static int 1978zipx_ppmd8_init(struct archive_read *a, struct zip *zip) 1979{ 1980 const void* p; 1981 uint32_t val; 1982 uint32_t order; 1983 uint32_t mem; 1984 uint32_t restore_method; 1985 1986 /* Remove previous decompression context if it exists. */ 1987 if(zip->ppmd8_valid) { 1988 __archive_ppmd8_functions.Ppmd8_Free(&zip->ppmd8); 1989 zip->ppmd8_valid = 0; 1990 } 1991 1992 /* Create a new decompression context. */ 1993 __archive_ppmd8_functions.Ppmd8_Construct(&zip->ppmd8); 1994 zip->ppmd8_stream_failed = 0; 1995 1996 /* Setup function pointers required by Ppmd8 decompressor. The 1997 * 'ppmd_read' function will feed new bytes to the decompressor, 1998 * and will increment the 'zip->zipx_ppmd_read_compressed' counter. */ 1999 zip->ppmd8.Stream.In = &zip->zipx_ppmd_stream; 2000 zip->zipx_ppmd_stream.a = a; 2001 zip->zipx_ppmd_stream.Read = &ppmd_read; 2002 2003 /* Reset number of read bytes to 0. */ 2004 zip->zipx_ppmd_read_compressed = 0; 2005 2006 /* Read Ppmd8 header (2 bytes). */ 2007 p = __archive_read_ahead(a, 2, NULL); 2008 if(!p) { 2009 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2010 "Truncated file data in PPMd8 stream"); 2011 return (ARCHIVE_FATAL); 2012 } 2013 __archive_read_consume(a, 2); 2014 2015 /* Decode the stream's compression parameters. */ 2016 val = archive_le16dec(p); 2017 order = (val & 15) + 1; 2018 mem = ((val >> 4) & 0xff) + 1; 2019 restore_method = (val >> 12); 2020 2021 if(order < 2 || restore_method > 2) { 2022 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2023 "Invalid parameter set in PPMd8 stream (order=%" PRId32 ", " 2024 "restore=%" PRId32 ")", order, restore_method); 2025 return (ARCHIVE_FAILED); 2026 } 2027 2028 /* Allocate the memory needed to properly decompress the file. */ 2029 if(!__archive_ppmd8_functions.Ppmd8_Alloc(&zip->ppmd8, mem << 20)) { 2030 archive_set_error(&a->archive, ENOMEM, 2031 "Unable to allocate memory for PPMd8 stream: %" PRId32 " bytes", 2032 mem << 20); 2033 return (ARCHIVE_FATAL); 2034 } 2035 2036 /* Signal the cleanup function to release Ppmd8 context in the 2037 * cleanup phase. */ 2038 zip->ppmd8_valid = 1; 2039 2040 /* Perform further Ppmd8 initialization. */ 2041 if(!__archive_ppmd8_functions.Ppmd8_RangeDec_Init(&zip->ppmd8)) { 2042 archive_set_error(&a->archive, ARCHIVE_ERRNO_PROGRAMMER, 2043 "PPMd8 stream range decoder initialization error"); 2044 return (ARCHIVE_FATAL); 2045 } 2046 2047 __archive_ppmd8_functions.Ppmd8_Init(&zip->ppmd8, order, 2048 restore_method); 2049 2050 /* Allocate the buffer that will hold uncompressed data. */ 2051 free(zip->uncompressed_buffer); 2052 2053 zip->uncompressed_buffer_size = 256 * 1024; 2054 zip->uncompressed_buffer = 2055 (uint8_t*) malloc(zip->uncompressed_buffer_size); 2056 2057 if(zip->uncompressed_buffer == NULL) { 2058 archive_set_error(&a->archive, ENOMEM, 2059 "No memory for PPMd8 decompression"); 2060 return ARCHIVE_FATAL; 2061 } 2062 2063 /* Ppmd8 initialization is done. */ 2064 zip->decompress_init = 1; 2065 2066 /* We've already read 2 bytes in the output stream. Additionally, 2067 * Ppmd8 initialization code could read some data as well. So we 2068 * are advancing the stream by 2 bytes plus whatever number of 2069 * bytes Ppmd8 init function used. */ 2070 zip->entry_compressed_bytes_read += 2 + zip->zipx_ppmd_read_compressed; 2071 2072 return ARCHIVE_OK; 2073} 2074 2075static int 2076zip_read_data_zipx_ppmd(struct archive_read *a, const void **buff, 2077 size_t *size, int64_t *offset) 2078{ 2079 struct zip* zip = (struct zip *)(a->format->data); 2080 int ret; 2081 size_t consumed_bytes = 0; 2082 ssize_t bytes_avail = 0; 2083 2084 (void) offset; /* UNUSED */ 2085 2086 /* If we're here for the first time, initialize Ppmd8 decompression 2087 * context first. */ 2088 if(!zip->decompress_init) { 2089 ret = zipx_ppmd8_init(a, zip); 2090 if(ret != ARCHIVE_OK) 2091 return ret; 2092 } 2093 2094 /* Fetch for more data. We're reading 1 byte here, but libarchive 2095 * should prefetch more bytes. */ 2096 (void) __archive_read_ahead(a, 1, &bytes_avail); 2097 if(bytes_avail < 0) { 2098 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2099 "Truncated PPMd8 file body"); 2100 return (ARCHIVE_FATAL); 2101 } 2102 2103 /* This counter will be updated inside ppmd_read(), which at one 2104 * point will be called by Ppmd8_DecodeSymbol. */ 2105 zip->zipx_ppmd_read_compressed = 0; 2106 2107 /* Decompression loop. */ 2108 do { 2109 int sym = __archive_ppmd8_functions.Ppmd8_DecodeSymbol( 2110 &zip->ppmd8); 2111 if(sym < 0) { 2112 zip->end_of_entry = 1; 2113 break; 2114 } 2115 2116 /* This field is set by ppmd_read() when there was no more data 2117 * to be read. */ 2118 if(zip->ppmd8_stream_failed) { 2119 archive_set_error(&a->archive, 2120 ARCHIVE_ERRNO_FILE_FORMAT, 2121 "Truncated PPMd8 file body"); 2122 return (ARCHIVE_FATAL); 2123 } 2124 2125 zip->uncompressed_buffer[consumed_bytes] = (uint8_t) sym; 2126 ++consumed_bytes; 2127 } while(consumed_bytes < zip->uncompressed_buffer_size); 2128 2129 /* Update pointers for libarchive. */ 2130 *buff = zip->uncompressed_buffer; 2131 *size = consumed_bytes; 2132 2133 /* Update pointers so we can continue decompression in another call. */ 2134 zip->entry_bytes_remaining -= zip->zipx_ppmd_read_compressed; 2135 zip->entry_compressed_bytes_read += zip->zipx_ppmd_read_compressed; 2136 zip->entry_uncompressed_bytes_read += consumed_bytes; 2137 2138 /* If we're at the end of stream, deinitialize Ppmd8 context. */ 2139 if(zip->end_of_entry) { 2140 __archive_ppmd8_functions.Ppmd8_Free(&zip->ppmd8); 2141 zip->ppmd8_valid = 0; 2142 } 2143 2144 /* Seek for optional marker, same way as in each zip entry. */ 2145 ret = consume_optional_marker(a, zip); 2146 if (ret != ARCHIVE_OK) 2147 return ret; 2148 2149 return ARCHIVE_OK; 2150} 2151 2152#ifdef HAVE_BZLIB_H 2153static int 2154zipx_bzip2_init(struct archive_read *a, struct zip *zip) 2155{ 2156 int r; 2157 2158 /* Deallocate already existing BZ2 decompression context if it 2159 * exists. */ 2160 if(zip->bzstream_valid) { 2161 BZ2_bzDecompressEnd(&zip->bzstream); 2162 zip->bzstream_valid = 0; 2163 } 2164 2165 /* Allocate a new BZ2 decompression context. */ 2166 memset(&zip->bzstream, 0, sizeof(bz_stream)); 2167 r = BZ2_bzDecompressInit(&zip->bzstream, 0, 1); 2168 if(r != BZ_OK) { 2169 archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC, 2170 "bzip2 initialization failed(%d)", 2171 r); 2172 2173 return ARCHIVE_FAILED; 2174 } 2175 2176 /* Mark the bzstream field to be released in cleanup phase. */ 2177 zip->bzstream_valid = 1; 2178 2179 /* (Re)allocate the buffer that will contain decompressed bytes. */ 2180 free(zip->uncompressed_buffer); 2181 2182 zip->uncompressed_buffer_size = 256 * 1024; 2183 zip->uncompressed_buffer = 2184 (uint8_t*) malloc(zip->uncompressed_buffer_size); 2185 if (zip->uncompressed_buffer == NULL) { 2186 archive_set_error(&a->archive, ENOMEM, 2187 "No memory for bzip2 decompression"); 2188 return ARCHIVE_FATAL; 2189 } 2190 2191 /* Initialization done. */ 2192 zip->decompress_init = 1; 2193 return ARCHIVE_OK; 2194} 2195 2196static int 2197zip_read_data_zipx_bzip2(struct archive_read *a, const void **buff, 2198 size_t *size, int64_t *offset) 2199{ 2200 struct zip *zip = (struct zip *)(a->format->data); 2201 ssize_t bytes_avail = 0, in_bytes, to_consume; 2202 const void *compressed_buff; 2203 int r; 2204 uint64_t total_out; 2205 2206 (void) offset; /* UNUSED */ 2207 2208 /* Initialize decompression context if we're here for the first time. */ 2209 if(!zip->decompress_init) { 2210 r = zipx_bzip2_init(a, zip); 2211 if(r != ARCHIVE_OK) 2212 return r; 2213 } 2214 2215 /* Fetch more compressed bytes. */ 2216 compressed_buff = __archive_read_ahead(a, 1, &bytes_avail); 2217 if(bytes_avail < 0) { 2218 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2219 "Truncated bzip2 file body"); 2220 return (ARCHIVE_FATAL); 2221 } 2222 2223 in_bytes = zipmin(zip->entry_bytes_remaining, bytes_avail); 2224 if(in_bytes < 1) { 2225 /* libbz2 doesn't complain when caller feeds avail_in == 0. 2226 * It will actually return success in this case, which is 2227 * undesirable. This is why we need to make this check 2228 * manually. */ 2229 2230 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2231 "Truncated bzip2 file body"); 2232 return (ARCHIVE_FATAL); 2233 } 2234 2235 /* Setup buffer boundaries. */ 2236 zip->bzstream.next_in = (char*)(uintptr_t) compressed_buff; 2237 zip->bzstream.avail_in = in_bytes; 2238 zip->bzstream.total_in_hi32 = 0; 2239 zip->bzstream.total_in_lo32 = 0; 2240 zip->bzstream.next_out = (char*) zip->uncompressed_buffer; 2241 zip->bzstream.avail_out = zip->uncompressed_buffer_size; 2242 zip->bzstream.total_out_hi32 = 0; 2243 zip->bzstream.total_out_lo32 = 0; 2244 2245 /* Perform the decompression. */ 2246 r = BZ2_bzDecompress(&zip->bzstream); 2247 switch(r) { 2248 case BZ_STREAM_END: 2249 /* If we're at the end of the stream, deinitialize the 2250 * decompression context now. */ 2251 switch(BZ2_bzDecompressEnd(&zip->bzstream)) { 2252 case BZ_OK: 2253 break; 2254 default: 2255 archive_set_error(&a->archive, 2256 ARCHIVE_ERRNO_MISC, 2257 "Failed to clean up bzip2 " 2258 "decompressor"); 2259 return ARCHIVE_FATAL; 2260 } 2261 2262 zip->end_of_entry = 1; 2263 break; 2264 case BZ_OK: 2265 /* The decompressor has successfully decoded this 2266 * chunk of data, but more data is still in queue. */ 2267 break; 2268 default: 2269 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2270 "bzip2 decompression failed"); 2271 return ARCHIVE_FATAL; 2272 } 2273 2274 /* Update the pointers so decompressor can continue decoding. */ 2275 to_consume = zip->bzstream.total_in_lo32; 2276 __archive_read_consume(a, to_consume); 2277 2278 total_out = ((uint64_t) zip->bzstream.total_out_hi32 << 32) + 2279 zip->bzstream.total_out_lo32; 2280 2281 zip->entry_bytes_remaining -= to_consume; 2282 zip->entry_compressed_bytes_read += to_consume; 2283 zip->entry_uncompressed_bytes_read += total_out; 2284 2285 /* Give libarchive its due. */ 2286 *size = total_out; 2287 *buff = zip->uncompressed_buffer; 2288 2289 /* Seek for optional marker, like in other entries. */ 2290 r = consume_optional_marker(a, zip); 2291 if(r != ARCHIVE_OK) 2292 return r; 2293 2294 return ARCHIVE_OK; 2295} 2296 2297#endif 2298 2299#ifdef HAVE_ZLIB_H 2300static int 2301zip_deflate_init(struct archive_read *a, struct zip *zip) 2302{ 2303 int r; 2304 2305 /* If we haven't yet read any data, initialize the decompressor. */ 2306 if (!zip->decompress_init) { 2307 if (zip->stream_valid) 2308 r = inflateReset(&zip->stream); 2309 else 2310 r = inflateInit2(&zip->stream, 2311 -15 /* Don't check for zlib header */); 2312 if (r != Z_OK) { 2313 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2314 "Can't initialize ZIP decompression."); 2315 return (ARCHIVE_FATAL); 2316 } 2317 /* Stream structure has been set up. */ 2318 zip->stream_valid = 1; 2319 /* We've initialized decompression for this stream. */ 2320 zip->decompress_init = 1; 2321 } 2322 return (ARCHIVE_OK); 2323} 2324 2325static int 2326zip_read_data_deflate(struct archive_read *a, const void **buff, 2327 size_t *size, int64_t *offset) 2328{ 2329 struct zip *zip; 2330 ssize_t bytes_avail; 2331 const void *compressed_buff, *sp; 2332 int r; 2333 2334 (void)offset; /* UNUSED */ 2335 2336 zip = (struct zip *)(a->format->data); 2337 2338 /* If the buffer hasn't been allocated, allocate it now. */ 2339 if (zip->uncompressed_buffer == NULL) { 2340 zip->uncompressed_buffer_size = 256 * 1024; 2341 zip->uncompressed_buffer 2342 = (unsigned char *)malloc(zip->uncompressed_buffer_size); 2343 if (zip->uncompressed_buffer == NULL) { 2344 archive_set_error(&a->archive, ENOMEM, 2345 "No memory for ZIP decompression"); 2346 return (ARCHIVE_FATAL); 2347 } 2348 } 2349 2350 r = zip_deflate_init(a, zip); 2351 if (r != ARCHIVE_OK) 2352 return (r); 2353 2354 /* 2355 * Note: '1' here is a performance optimization. 2356 * Recall that the decompression layer returns a count of 2357 * available bytes; asking for more than that forces the 2358 * decompressor to combine reads by copying data. 2359 */ 2360 compressed_buff = sp = __archive_read_ahead(a, 1, &bytes_avail); 2361 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) 2362 && bytes_avail > zip->entry_bytes_remaining) { 2363 bytes_avail = (ssize_t)zip->entry_bytes_remaining; 2364 } 2365 if (bytes_avail < 0) { 2366 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2367 "Truncated ZIP file body"); 2368 return (ARCHIVE_FATAL); 2369 } 2370 2371 if (zip->tctx_valid || zip->cctx_valid) { 2372 if (zip->decrypted_bytes_remaining < (size_t)bytes_avail) { 2373 size_t buff_remaining = 2374 (zip->decrypted_buffer + 2375 zip->decrypted_buffer_size) 2376 - (zip->decrypted_ptr + 2377 zip->decrypted_bytes_remaining); 2378 2379 if (buff_remaining > (size_t)bytes_avail) 2380 buff_remaining = (size_t)bytes_avail; 2381 2382 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) && 2383 zip->entry_bytes_remaining > 0) { 2384 if ((int64_t)(zip->decrypted_bytes_remaining 2385 + buff_remaining) 2386 > zip->entry_bytes_remaining) { 2387 if (zip->entry_bytes_remaining < 2388 (int64_t)zip->decrypted_bytes_remaining) 2389 buff_remaining = 0; 2390 else 2391 buff_remaining = 2392 (size_t)zip->entry_bytes_remaining 2393 - zip->decrypted_bytes_remaining; 2394 } 2395 } 2396 if (buff_remaining > 0) { 2397 if (zip->tctx_valid) { 2398 trad_enc_decrypt_update(&zip->tctx, 2399 compressed_buff, buff_remaining, 2400 zip->decrypted_ptr 2401 + zip->decrypted_bytes_remaining, 2402 buff_remaining); 2403 } else { 2404 size_t dsize = buff_remaining; 2405 archive_decrypto_aes_ctr_update( 2406 &zip->cctx, 2407 compressed_buff, buff_remaining, 2408 zip->decrypted_ptr 2409 + zip->decrypted_bytes_remaining, 2410 &dsize); 2411 } 2412 zip->decrypted_bytes_remaining += 2413 buff_remaining; 2414 } 2415 } 2416 bytes_avail = zip->decrypted_bytes_remaining; 2417 compressed_buff = (const char *)zip->decrypted_ptr; 2418 } 2419 2420 /* 2421 * A bug in zlib.h: stream.next_in should be marked 'const' 2422 * but isn't (the library never alters data through the 2423 * next_in pointer, only reads it). The result: this ugly 2424 * cast to remove 'const'. 2425 */ 2426 zip->stream.next_in = (Bytef *)(uintptr_t)(const void *)compressed_buff; 2427 zip->stream.avail_in = (uInt)bytes_avail; 2428 zip->stream.total_in = 0; 2429 zip->stream.next_out = zip->uncompressed_buffer; 2430 zip->stream.avail_out = (uInt)zip->uncompressed_buffer_size; 2431 zip->stream.total_out = 0; 2432 2433 r = inflate(&zip->stream, 0); 2434 switch (r) { 2435 case Z_OK: 2436 break; 2437 case Z_STREAM_END: 2438 zip->end_of_entry = 1; 2439 break; 2440 case Z_MEM_ERROR: 2441 archive_set_error(&a->archive, ENOMEM, 2442 "Out of memory for ZIP decompression"); 2443 return (ARCHIVE_FATAL); 2444 default: 2445 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2446 "ZIP decompression failed (%d)", r); 2447 return (ARCHIVE_FATAL); 2448 } 2449 2450 /* Consume as much as the compressor actually used. */ 2451 bytes_avail = zip->stream.total_in; 2452 if (zip->tctx_valid || zip->cctx_valid) { 2453 zip->decrypted_bytes_remaining -= bytes_avail; 2454 if (zip->decrypted_bytes_remaining == 0) 2455 zip->decrypted_ptr = zip->decrypted_buffer; 2456 else 2457 zip->decrypted_ptr += bytes_avail; 2458 } 2459 /* Calculate compressed data as much as we used.*/ 2460 if (zip->hctx_valid) 2461 archive_hmac_sha1_update(&zip->hctx, sp, bytes_avail); 2462 __archive_read_consume(a, bytes_avail); 2463 zip->entry_bytes_remaining -= bytes_avail; 2464 zip->entry_compressed_bytes_read += bytes_avail; 2465 2466 *size = zip->stream.total_out; 2467 zip->entry_uncompressed_bytes_read += zip->stream.total_out; 2468 *buff = zip->uncompressed_buffer; 2469 2470 if (zip->end_of_entry && zip->hctx_valid) { 2471 r = check_authentication_code(a, NULL); 2472 if (r != ARCHIVE_OK) 2473 return (r); 2474 } 2475 2476 r = consume_optional_marker(a, zip); 2477 if (r != ARCHIVE_OK) 2478 return (r); 2479 2480 return (ARCHIVE_OK); 2481} 2482#endif 2483 2484static int 2485read_decryption_header(struct archive_read *a) 2486{ 2487 struct zip *zip = (struct zip *)(a->format->data); 2488 const char *p; 2489 unsigned int remaining_size; 2490 unsigned int ts; 2491 2492 /* 2493 * Read an initialization vector data field. 2494 */ 2495 p = __archive_read_ahead(a, 2, NULL); 2496 if (p == NULL) 2497 goto truncated; 2498 ts = zip->iv_size; 2499 zip->iv_size = archive_le16dec(p); 2500 __archive_read_consume(a, 2); 2501 if (ts < zip->iv_size) { 2502 free(zip->iv); 2503 zip->iv = NULL; 2504 } 2505 p = __archive_read_ahead(a, zip->iv_size, NULL); 2506 if (p == NULL) 2507 goto truncated; 2508 if (zip->iv == NULL) { 2509 zip->iv = malloc(zip->iv_size); 2510 if (zip->iv == NULL) 2511 goto nomem; 2512 } 2513 memcpy(zip->iv, p, zip->iv_size); 2514 __archive_read_consume(a, zip->iv_size); 2515 2516 /* 2517 * Read a size of remaining decryption header field. 2518 */ 2519 p = __archive_read_ahead(a, 14, NULL); 2520 if (p == NULL) 2521 goto truncated; 2522 remaining_size = archive_le32dec(p); 2523 if (remaining_size < 16 || remaining_size > (1 << 18)) 2524 goto corrupted; 2525 2526 /* Check if format version is supported. */ 2527 if (archive_le16dec(p+4) != 3) { 2528 archive_set_error(&a->archive, 2529 ARCHIVE_ERRNO_FILE_FORMAT, 2530 "Unsupported encryption format version: %u", 2531 archive_le16dec(p+4)); 2532 return (ARCHIVE_FAILED); 2533 } 2534 2535 /* 2536 * Read an encryption algorithm field. 2537 */ 2538 zip->alg_id = archive_le16dec(p+6); 2539 switch (zip->alg_id) { 2540 case 0x6601:/* DES */ 2541 case 0x6602:/* RC2 */ 2542 case 0x6603:/* 3DES 168 */ 2543 case 0x6609:/* 3DES 112 */ 2544 case 0x660E:/* AES 128 */ 2545 case 0x660F:/* AES 192 */ 2546 case 0x6610:/* AES 256 */ 2547 case 0x6702:/* RC2 (version >= 5.2) */ 2548 case 0x6720:/* Blowfish */ 2549 case 0x6721:/* Twofish */ 2550 case 0x6801:/* RC4 */ 2551 /* Supported encryption algorithm. */ 2552 break; 2553 default: 2554 archive_set_error(&a->archive, 2555 ARCHIVE_ERRNO_FILE_FORMAT, 2556 "Unknown encryption algorithm: %u", zip->alg_id); 2557 return (ARCHIVE_FAILED); 2558 } 2559 2560 /* 2561 * Read a bit length field. 2562 */ 2563 zip->bit_len = archive_le16dec(p+8); 2564 2565 /* 2566 * Read a flags field. 2567 */ 2568 zip->flags = archive_le16dec(p+10); 2569 switch (zip->flags & 0xf000) { 2570 case 0x0001: /* Password is required to decrypt. */ 2571 case 0x0002: /* Certificates only. */ 2572 case 0x0003: /* Password or certificate required to decrypt. */ 2573 break; 2574 default: 2575 archive_set_error(&a->archive, 2576 ARCHIVE_ERRNO_FILE_FORMAT, 2577 "Unknown encryption flag: %u", zip->flags); 2578 return (ARCHIVE_FAILED); 2579 } 2580 if ((zip->flags & 0xf000) == 0 || 2581 (zip->flags & 0xf000) == 0x4000) { 2582 archive_set_error(&a->archive, 2583 ARCHIVE_ERRNO_FILE_FORMAT, 2584 "Unknown encryption flag: %u", zip->flags); 2585 return (ARCHIVE_FAILED); 2586 } 2587 2588 /* 2589 * Read an encrypted random data field. 2590 */ 2591 ts = zip->erd_size; 2592 zip->erd_size = archive_le16dec(p+12); 2593 __archive_read_consume(a, 14); 2594 if ((zip->erd_size & 0xf) != 0 || 2595 (zip->erd_size + 16) > remaining_size || 2596 (zip->erd_size + 16) < zip->erd_size) 2597 goto corrupted; 2598 2599 if (ts < zip->erd_size) { 2600 free(zip->erd); 2601 zip->erd = NULL; 2602 } 2603 p = __archive_read_ahead(a, zip->erd_size, NULL); 2604 if (p == NULL) 2605 goto truncated; 2606 if (zip->erd == NULL) { 2607 zip->erd = malloc(zip->erd_size); 2608 if (zip->erd == NULL) 2609 goto nomem; 2610 } 2611 memcpy(zip->erd, p, zip->erd_size); 2612 __archive_read_consume(a, zip->erd_size); 2613 2614 /* 2615 * Read a reserved data field. 2616 */ 2617 p = __archive_read_ahead(a, 4, NULL); 2618 if (p == NULL) 2619 goto truncated; 2620 /* Reserved data size should be zero. */ 2621 if (archive_le32dec(p) != 0) 2622 goto corrupted; 2623 __archive_read_consume(a, 4); 2624 2625 /* 2626 * Read a password validation data field. 2627 */ 2628 p = __archive_read_ahead(a, 2, NULL); 2629 if (p == NULL) 2630 goto truncated; 2631 ts = zip->v_size; 2632 zip->v_size = archive_le16dec(p); 2633 __archive_read_consume(a, 2); 2634 if ((zip->v_size & 0x0f) != 0 || 2635 (zip->erd_size + zip->v_size + 16) > remaining_size || 2636 (zip->erd_size + zip->v_size + 16) < (zip->erd_size + zip->v_size)) 2637 goto corrupted; 2638 if (ts < zip->v_size) { 2639 free(zip->v_data); 2640 zip->v_data = NULL; 2641 } 2642 p = __archive_read_ahead(a, zip->v_size, NULL); 2643 if (p == NULL) 2644 goto truncated; 2645 if (zip->v_data == NULL) { 2646 zip->v_data = malloc(zip->v_size); 2647 if (zip->v_data == NULL) 2648 goto nomem; 2649 } 2650 memcpy(zip->v_data, p, zip->v_size); 2651 __archive_read_consume(a, zip->v_size); 2652 2653 p = __archive_read_ahead(a, 4, NULL); 2654 if (p == NULL) 2655 goto truncated; 2656 zip->v_crc32 = archive_le32dec(p); 2657 __archive_read_consume(a, 4); 2658 2659 /*return (ARCHIVE_OK); 2660 * This is not fully implemented yet.*/ 2661 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2662 "Encrypted file is unsupported"); 2663 return (ARCHIVE_FAILED); 2664truncated: 2665 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2666 "Truncated ZIP file data"); 2667 return (ARCHIVE_FATAL); 2668corrupted: 2669 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2670 "Corrupted ZIP file data"); 2671 return (ARCHIVE_FATAL); 2672nomem: 2673 archive_set_error(&a->archive, ENOMEM, 2674 "No memory for ZIP decryption"); 2675 return (ARCHIVE_FATAL); 2676} 2677 2678static int 2679zip_alloc_decryption_buffer(struct archive_read *a) 2680{ 2681 struct zip *zip = (struct zip *)(a->format->data); 2682 size_t bs = 256 * 1024; 2683 2684 if (zip->decrypted_buffer == NULL) { 2685 zip->decrypted_buffer_size = bs; 2686 zip->decrypted_buffer = malloc(bs); 2687 if (zip->decrypted_buffer == NULL) { 2688 archive_set_error(&a->archive, ENOMEM, 2689 "No memory for ZIP decryption"); 2690 return (ARCHIVE_FATAL); 2691 } 2692 } 2693 zip->decrypted_ptr = zip->decrypted_buffer; 2694 return (ARCHIVE_OK); 2695} 2696 2697static int 2698init_traditional_PKWARE_decryption(struct archive_read *a) 2699{ 2700 struct zip *zip = (struct zip *)(a->format->data); 2701 const void *p; 2702 int retry; 2703 int r; 2704 2705 if (zip->tctx_valid) 2706 return (ARCHIVE_OK); 2707 2708 /* 2709 Read the 12 bytes encryption header stored at 2710 the start of the data area. 2711 */ 2712#define ENC_HEADER_SIZE 12 2713 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) 2714 && zip->entry_bytes_remaining < ENC_HEADER_SIZE) { 2715 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2716 "Truncated Zip encrypted body: only %jd bytes available", 2717 (intmax_t)zip->entry_bytes_remaining); 2718 return (ARCHIVE_FATAL); 2719 } 2720 2721 p = __archive_read_ahead(a, ENC_HEADER_SIZE, NULL); 2722 if (p == NULL) { 2723 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2724 "Truncated ZIP file data"); 2725 return (ARCHIVE_FATAL); 2726 } 2727 2728 for (retry = 0;; retry++) { 2729 const char *passphrase; 2730 uint8_t crcchk; 2731 2732 passphrase = __archive_read_next_passphrase(a); 2733 if (passphrase == NULL) { 2734 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2735 (retry > 0)? 2736 "Incorrect passphrase": 2737 "Passphrase required for this entry"); 2738 return (ARCHIVE_FAILED); 2739 } 2740 2741 /* 2742 * Initialize ctx for Traditional PKWARE Decryption. 2743 */ 2744 r = trad_enc_init(&zip->tctx, passphrase, strlen(passphrase), 2745 p, ENC_HEADER_SIZE, &crcchk); 2746 if (r == 0 && crcchk == zip->entry->decdat) 2747 break;/* The passphrase is OK. */ 2748 if (retry > 10000) { 2749 /* Avoid infinity loop. */ 2750 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2751 "Too many incorrect passphrases"); 2752 return (ARCHIVE_FAILED); 2753 } 2754 } 2755 2756 __archive_read_consume(a, ENC_HEADER_SIZE); 2757 zip->tctx_valid = 1; 2758 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)) { 2759 zip->entry_bytes_remaining -= ENC_HEADER_SIZE; 2760 } 2761 /*zip->entry_uncompressed_bytes_read += ENC_HEADER_SIZE;*/ 2762 zip->entry_compressed_bytes_read += ENC_HEADER_SIZE; 2763 zip->decrypted_bytes_remaining = 0; 2764 2765 return (zip_alloc_decryption_buffer(a)); 2766#undef ENC_HEADER_SIZE 2767} 2768 2769static int 2770init_WinZip_AES_decryption(struct archive_read *a) 2771{ 2772 struct zip *zip = (struct zip *)(a->format->data); 2773 const void *p; 2774 const uint8_t *pv; 2775 size_t key_len, salt_len; 2776 uint8_t derived_key[MAX_DERIVED_KEY_BUF_SIZE]; 2777 int retry; 2778 int r; 2779 2780 if (zip->cctx_valid || zip->hctx_valid) 2781 return (ARCHIVE_OK); 2782 2783 switch (zip->entry->aes_extra.strength) { 2784 case 1: salt_len = 8; key_len = 16; break; 2785 case 2: salt_len = 12; key_len = 24; break; 2786 case 3: salt_len = 16; key_len = 32; break; 2787 default: goto corrupted; 2788 } 2789 p = __archive_read_ahead(a, salt_len + 2, NULL); 2790 if (p == NULL) 2791 goto truncated; 2792 2793 for (retry = 0;; retry++) { 2794 const char *passphrase; 2795 2796 passphrase = __archive_read_next_passphrase(a); 2797 if (passphrase == NULL) { 2798 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2799 (retry > 0)? 2800 "Incorrect passphrase": 2801 "Passphrase required for this entry"); 2802 return (ARCHIVE_FAILED); 2803 } 2804 memset(derived_key, 0, sizeof(derived_key)); 2805 r = archive_pbkdf2_sha1(passphrase, strlen(passphrase), 2806 p, salt_len, 1000, derived_key, key_len * 2 + 2); 2807 if (r != 0) { 2808 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2809 "Decryption is unsupported due to lack of " 2810 "crypto library"); 2811 return (ARCHIVE_FAILED); 2812 } 2813 2814 /* Check password verification value. */ 2815 pv = ((const uint8_t *)p) + salt_len; 2816 if (derived_key[key_len * 2] == pv[0] && 2817 derived_key[key_len * 2 + 1] == pv[1]) 2818 break;/* The passphrase is OK. */ 2819 if (retry > 10000) { 2820 /* Avoid infinity loop. */ 2821 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2822 "Too many incorrect passphrases"); 2823 return (ARCHIVE_FAILED); 2824 } 2825 } 2826 2827 r = archive_decrypto_aes_ctr_init(&zip->cctx, derived_key, key_len); 2828 if (r != 0) { 2829 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2830 "Decryption is unsupported due to lack of crypto library"); 2831 return (ARCHIVE_FAILED); 2832 } 2833 r = archive_hmac_sha1_init(&zip->hctx, derived_key + key_len, key_len); 2834 if (r != 0) { 2835 archive_decrypto_aes_ctr_release(&zip->cctx); 2836 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2837 "Failed to initialize HMAC-SHA1"); 2838 return (ARCHIVE_FAILED); 2839 } 2840 zip->cctx_valid = zip->hctx_valid = 1; 2841 __archive_read_consume(a, salt_len + 2); 2842 zip->entry_bytes_remaining -= salt_len + 2 + AUTH_CODE_SIZE; 2843 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) 2844 && zip->entry_bytes_remaining < 0) 2845 goto corrupted; 2846 zip->entry_compressed_bytes_read += salt_len + 2 + AUTH_CODE_SIZE; 2847 zip->decrypted_bytes_remaining = 0; 2848 2849 zip->entry->compression = zip->entry->aes_extra.compression; 2850 return (zip_alloc_decryption_buffer(a)); 2851 2852truncated: 2853 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2854 "Truncated ZIP file data"); 2855 return (ARCHIVE_FATAL); 2856corrupted: 2857 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2858 "Corrupted ZIP file data"); 2859 return (ARCHIVE_FATAL); 2860} 2861 2862static int 2863archive_read_format_zip_read_data(struct archive_read *a, 2864 const void **buff, size_t *size, int64_t *offset) 2865{ 2866 int r; 2867 struct zip *zip = (struct zip *)(a->format->data); 2868 2869 if (zip->has_encrypted_entries == 2870 ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) { 2871 zip->has_encrypted_entries = 0; 2872 } 2873 2874 *offset = zip->entry_uncompressed_bytes_read; 2875 *size = 0; 2876 *buff = NULL; 2877 2878 /* If we hit end-of-entry last time, return ARCHIVE_EOF. */ 2879 if (zip->end_of_entry) 2880 return (ARCHIVE_EOF); 2881 2882 /* Return EOF immediately if this is a non-regular file. */ 2883 if (AE_IFREG != (zip->entry->mode & AE_IFMT)) 2884 return (ARCHIVE_EOF); 2885 2886 __archive_read_consume(a, zip->unconsumed); 2887 zip->unconsumed = 0; 2888 2889 if (zip->init_decryption) { 2890 zip->has_encrypted_entries = 1; 2891 if (zip->entry->zip_flags & ZIP_STRONG_ENCRYPTED) 2892 r = read_decryption_header(a); 2893 else if (zip->entry->compression == WINZIP_AES_ENCRYPTION) 2894 r = init_WinZip_AES_decryption(a); 2895 else 2896 r = init_traditional_PKWARE_decryption(a); 2897 if (r != ARCHIVE_OK) 2898 return (r); 2899 zip->init_decryption = 0; 2900 } 2901 2902 switch(zip->entry->compression) { 2903 case 0: /* No compression. */ 2904 r = zip_read_data_none(a, buff, size, offset); 2905 break; 2906#ifdef HAVE_BZLIB_H 2907 case 12: /* ZIPx bzip2 compression. */ 2908 r = zip_read_data_zipx_bzip2(a, buff, size, offset); 2909 break; 2910#endif 2911#if HAVE_LZMA_H && HAVE_LIBLZMA 2912 case 14: /* ZIPx LZMA compression. */ 2913 r = zip_read_data_zipx_lzma_alone(a, buff, size, offset); 2914 break; 2915 case 95: /* ZIPx XZ compression. */ 2916 r = zip_read_data_zipx_xz(a, buff, size, offset); 2917 break; 2918#endif 2919 /* PPMd support is built-in, so we don't need any #if guards. */ 2920 case 98: /* ZIPx PPMd compression. */ 2921 r = zip_read_data_zipx_ppmd(a, buff, size, offset); 2922 break; 2923 2924#ifdef HAVE_ZLIB_H 2925 case 8: /* Deflate compression. */ 2926 r = zip_read_data_deflate(a, buff, size, offset); 2927 break; 2928#endif 2929 default: /* Unsupported compression. */ 2930 /* Return a warning. */ 2931 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2932 "Unsupported ZIP compression method (%d: %s)", 2933 zip->entry->compression, compression_name(zip->entry->compression)); 2934 /* We can't decompress this entry, but we will 2935 * be able to skip() it and try the next entry. */ 2936 return (ARCHIVE_FAILED); 2937 break; 2938 } 2939 if (r != ARCHIVE_OK) 2940 return (r); 2941 /* Update checksum */ 2942 if (*size) 2943 zip->entry_crc32 = zip->crc32func(zip->entry_crc32, *buff, 2944 (unsigned)*size); 2945 /* If we hit the end, swallow any end-of-data marker. */ 2946 if (zip->end_of_entry) { 2947 /* Check file size, CRC against these values. */ 2948 if (zip->entry->compressed_size != 2949 zip->entry_compressed_bytes_read) { 2950 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2951 "ZIP compressed data is wrong size " 2952 "(read %jd, expected %jd)", 2953 (intmax_t)zip->entry_compressed_bytes_read, 2954 (intmax_t)zip->entry->compressed_size); 2955 return (ARCHIVE_WARN); 2956 } 2957 /* Size field only stores the lower 32 bits of the actual 2958 * size. */ 2959 if ((zip->entry->uncompressed_size & UINT32_MAX) 2960 != (zip->entry_uncompressed_bytes_read & UINT32_MAX)) { 2961 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2962 "ZIP uncompressed data is wrong size " 2963 "(read %jd, expected %jd)\n", 2964 (intmax_t)zip->entry_uncompressed_bytes_read, 2965 (intmax_t)zip->entry->uncompressed_size); 2966 return (ARCHIVE_WARN); 2967 } 2968 /* Check computed CRC against header */ 2969 if ((!zip->hctx_valid || 2970 zip->entry->aes_extra.vendor != AES_VENDOR_AE_2) && 2971 zip->entry->crc32 != zip->entry_crc32 2972 && !zip->ignore_crc32) { 2973 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2974 "ZIP bad CRC: 0x%lx should be 0x%lx", 2975 (unsigned long)zip->entry_crc32, 2976 (unsigned long)zip->entry->crc32); 2977 return (ARCHIVE_WARN); 2978 } 2979 } 2980 2981 return (ARCHIVE_OK); 2982} 2983 2984static int 2985archive_read_format_zip_cleanup(struct archive_read *a) 2986{ 2987 struct zip *zip; 2988 struct zip_entry *zip_entry, *next_zip_entry; 2989 2990 zip = (struct zip *)(a->format->data); 2991 2992#ifdef HAVE_ZLIB_H 2993 if (zip->stream_valid) 2994 inflateEnd(&zip->stream); 2995#endif 2996 2997#if HAVE_LZMA_H && HAVE_LIBLZMA 2998 if (zip->zipx_lzma_valid) { 2999 lzma_end(&zip->zipx_lzma_stream); 3000 } 3001#endif 3002 3003#ifdef HAVE_BZLIB_H 3004 if (zip->bzstream_valid) { 3005 BZ2_bzDecompressEnd(&zip->bzstream); 3006 } 3007#endif 3008 3009 free(zip->uncompressed_buffer); 3010 3011 if (zip->ppmd8_valid) 3012 __archive_ppmd8_functions.Ppmd8_Free(&zip->ppmd8); 3013 3014 if (zip->zip_entries) { 3015 zip_entry = zip->zip_entries; 3016 while (zip_entry != NULL) { 3017 next_zip_entry = zip_entry->next; 3018 archive_string_free(&zip_entry->rsrcname); 3019 free(zip_entry); 3020 zip_entry = next_zip_entry; 3021 } 3022 } 3023 free(zip->decrypted_buffer); 3024 if (zip->cctx_valid) 3025 archive_decrypto_aes_ctr_release(&zip->cctx); 3026 if (zip->hctx_valid) 3027 archive_hmac_sha1_cleanup(&zip->hctx); 3028 free(zip->iv); 3029 free(zip->erd); 3030 free(zip->v_data); 3031 archive_string_free(&zip->format_name); 3032 free(zip); 3033 (a->format->data) = NULL; 3034 return (ARCHIVE_OK); 3035} 3036 3037static int 3038archive_read_format_zip_has_encrypted_entries(struct archive_read *_a) 3039{ 3040 if (_a && _a->format) { 3041 struct zip * zip = (struct zip *)_a->format->data; 3042 if (zip) { 3043 return zip->has_encrypted_entries; 3044 } 3045 } 3046 return ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW; 3047} 3048 3049static int 3050archive_read_format_zip_options(struct archive_read *a, 3051 const char *key, const char *val) 3052{ 3053 struct zip *zip; 3054 int ret = ARCHIVE_FAILED; 3055 3056 zip = (struct zip *)(a->format->data); 3057 if (strcmp(key, "compat-2x") == 0) { 3058 /* Handle filenames as libarchive 2.x */ 3059 zip->init_default_conversion = (val != NULL) ? 1 : 0; 3060 return (ARCHIVE_OK); 3061 } else if (strcmp(key, "hdrcharset") == 0) { 3062 if (val == NULL || val[0] == 0) 3063 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 3064 "zip: hdrcharset option needs a character-set name" 3065 ); 3066 else { 3067 zip->sconv = archive_string_conversion_from_charset( 3068 &a->archive, val, 0); 3069 if (zip->sconv != NULL) { 3070 if (strcmp(val, "UTF-8") == 0) 3071 zip->sconv_utf8 = zip->sconv; 3072 ret = ARCHIVE_OK; 3073 } else 3074 ret = ARCHIVE_FATAL; 3075 } 3076 return (ret); 3077 } else if (strcmp(key, "ignorecrc32") == 0) { 3078 /* Mostly useful for testing. */ 3079 if (val == NULL || val[0] == 0) { 3080 zip->crc32func = real_crc32; 3081 zip->ignore_crc32 = 0; 3082 } else { 3083 zip->crc32func = fake_crc32; 3084 zip->ignore_crc32 = 1; 3085 } 3086 return (ARCHIVE_OK); 3087 } else if (strcmp(key, "mac-ext") == 0) { 3088 zip->process_mac_extensions = (val != NULL && val[0] != 0); 3089 return (ARCHIVE_OK); 3090 } 3091 3092 /* Note: The "warn" return is just to inform the options 3093 * supervisor that we didn't handle it. It will generate 3094 * a suitable error if no one used this option. */ 3095 return (ARCHIVE_WARN); 3096} 3097 3098int 3099archive_read_support_format_zip(struct archive *a) 3100{ 3101 int r; 3102 r = archive_read_support_format_zip_streamable(a); 3103 if (r != ARCHIVE_OK) 3104 return r; 3105 return (archive_read_support_format_zip_seekable(a)); 3106} 3107 3108/* ------------------------------------------------------------------------ */ 3109 3110/* 3111 * Streaming-mode support 3112 */ 3113 3114 3115static int 3116archive_read_support_format_zip_capabilities_streamable(struct archive_read * a) 3117{ 3118 (void)a; /* UNUSED */ 3119 return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA | 3120 ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA); 3121} 3122 3123static int 3124archive_read_format_zip_streamable_bid(struct archive_read *a, int best_bid) 3125{ 3126 const char *p; 3127 3128 (void)best_bid; /* UNUSED */ 3129 3130 if ((p = __archive_read_ahead(a, 4, NULL)) == NULL) 3131 return (-1); 3132 3133 /* 3134 * Bid of 29 here comes from: 3135 * + 16 bits for "PK", 3136 * + next 16-bit field has 6 options so contributes 3137 * about 16 - log_2(6) ~= 16 - 2.6 ~= 13 bits 3138 * 3139 * So we've effectively verified ~29 total bits of check data. 3140 */ 3141 if (p[0] == 'P' && p[1] == 'K') { 3142 if ((p[2] == '\001' && p[3] == '\002') 3143 || (p[2] == '\003' && p[3] == '\004') 3144 || (p[2] == '\005' && p[3] == '\006') 3145 || (p[2] == '\006' && p[3] == '\006') 3146 || (p[2] == '\007' && p[3] == '\010') 3147 || (p[2] == '0' && p[3] == '0')) 3148 return (29); 3149 } 3150 3151 /* TODO: It's worth looking ahead a little bit for a valid 3152 * PK signature. In particular, that would make it possible 3153 * to read some UUEncoded SFX files or SFX files coming from 3154 * a network socket. */ 3155 3156 return (0); 3157} 3158 3159static int 3160archive_read_format_zip_streamable_read_header(struct archive_read *a, 3161 struct archive_entry *entry) 3162{ 3163 struct zip *zip; 3164 3165 a->archive.archive_format = ARCHIVE_FORMAT_ZIP; 3166 if (a->archive.archive_format_name == NULL) 3167 a->archive.archive_format_name = "ZIP"; 3168 3169 zip = (struct zip *)(a->format->data); 3170 3171 /* 3172 * It should be sufficient to call archive_read_next_header() for 3173 * a reader to determine if an entry is encrypted or not. If the 3174 * encryption of an entry is only detectable when calling 3175 * archive_read_data(), so be it. We'll do the same check there 3176 * as well. 3177 */ 3178 if (zip->has_encrypted_entries == 3179 ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) 3180 zip->has_encrypted_entries = 0; 3181 3182 /* Make sure we have a zip_entry structure to use. */ 3183 if (zip->zip_entries == NULL) { 3184 zip->zip_entries = malloc(sizeof(struct zip_entry)); 3185 if (zip->zip_entries == NULL) { 3186 archive_set_error(&a->archive, ENOMEM, 3187 "Out of memory"); 3188 return ARCHIVE_FATAL; 3189 } 3190 } 3191 zip->entry = zip->zip_entries; 3192 memset(zip->entry, 0, sizeof(struct zip_entry)); 3193 3194 if (zip->cctx_valid) 3195 archive_decrypto_aes_ctr_release(&zip->cctx); 3196 if (zip->hctx_valid) 3197 archive_hmac_sha1_cleanup(&zip->hctx); 3198 zip->tctx_valid = zip->cctx_valid = zip->hctx_valid = 0; 3199 __archive_read_reset_passphrase(a); 3200 3201 /* Search ahead for the next local file header. */ 3202 __archive_read_consume(a, zip->unconsumed); 3203 zip->unconsumed = 0; 3204 for (;;) { 3205 int64_t skipped = 0; 3206 const char *p, *end; 3207 ssize_t bytes; 3208 3209 p = __archive_read_ahead(a, 4, &bytes); 3210 if (p == NULL) 3211 return (ARCHIVE_FATAL); 3212 end = p + bytes; 3213 3214 while (p + 4 <= end) { 3215 if (p[0] == 'P' && p[1] == 'K') { 3216 if (p[2] == '\003' && p[3] == '\004') { 3217 /* Regular file entry. */ 3218 __archive_read_consume(a, skipped); 3219 return zip_read_local_file_header(a, 3220 entry, zip); 3221 } 3222 3223 /* 3224 * TODO: We cannot restore permissions 3225 * based only on the local file headers. 3226 * Consider scanning the central 3227 * directory and returning additional 3228 * entries for at least directories. 3229 * This would allow us to properly set 3230 * directory permissions. 3231 * 3232 * This won't help us fix symlinks 3233 * and may not help with regular file 3234 * permissions, either. <sigh> 3235 */ 3236 if (p[2] == '\001' && p[3] == '\002') { 3237 return (ARCHIVE_EOF); 3238 } 3239 3240 /* End of central directory? Must be an 3241 * empty archive. */ 3242 if ((p[2] == '\005' && p[3] == '\006') 3243 || (p[2] == '\006' && p[3] == '\006')) 3244 return (ARCHIVE_EOF); 3245 } 3246 ++p; 3247 ++skipped; 3248 } 3249 __archive_read_consume(a, skipped); 3250 } 3251} 3252 3253static int 3254archive_read_format_zip_read_data_skip_streamable(struct archive_read *a) 3255{ 3256 struct zip *zip; 3257 int64_t bytes_skipped; 3258 3259 zip = (struct zip *)(a->format->data); 3260 bytes_skipped = __archive_read_consume(a, zip->unconsumed); 3261 zip->unconsumed = 0; 3262 if (bytes_skipped < 0) 3263 return (ARCHIVE_FATAL); 3264 3265 /* If we've already read to end of data, we're done. */ 3266 if (zip->end_of_entry) 3267 return (ARCHIVE_OK); 3268 3269 /* So we know we're streaming... */ 3270 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) 3271 || zip->entry->compressed_size > 0) { 3272 /* We know the compressed length, so we can just skip. */ 3273 bytes_skipped = __archive_read_consume(a, 3274 zip->entry_bytes_remaining); 3275 if (bytes_skipped < 0) 3276 return (ARCHIVE_FATAL); 3277 return (ARCHIVE_OK); 3278 } 3279 3280 if (zip->init_decryption) { 3281 int r; 3282 3283 zip->has_encrypted_entries = 1; 3284 if (zip->entry->zip_flags & ZIP_STRONG_ENCRYPTED) 3285 r = read_decryption_header(a); 3286 else if (zip->entry->compression == WINZIP_AES_ENCRYPTION) 3287 r = init_WinZip_AES_decryption(a); 3288 else 3289 r = init_traditional_PKWARE_decryption(a); 3290 if (r != ARCHIVE_OK) 3291 return (r); 3292 zip->init_decryption = 0; 3293 } 3294 3295 /* We're streaming and we don't know the length. */ 3296 /* If the body is compressed and we know the format, we can 3297 * find an exact end-of-entry by decompressing it. */ 3298 switch (zip->entry->compression) { 3299#ifdef HAVE_ZLIB_H 3300 case 8: /* Deflate compression. */ 3301 while (!zip->end_of_entry) { 3302 int64_t offset = 0; 3303 const void *buff = NULL; 3304 size_t size = 0; 3305 int r; 3306 r = zip_read_data_deflate(a, &buff, &size, &offset); 3307 if (r != ARCHIVE_OK) 3308 return (r); 3309 } 3310 return ARCHIVE_OK; 3311#endif 3312 default: /* Uncompressed or unknown. */ 3313 /* Scan for a PK\007\010 signature. */ 3314 for (;;) { 3315 const char *p, *buff; 3316 ssize_t bytes_avail; 3317 buff = __archive_read_ahead(a, 16, &bytes_avail); 3318 if (bytes_avail < 16) { 3319 archive_set_error(&a->archive, 3320 ARCHIVE_ERRNO_FILE_FORMAT, 3321 "Truncated ZIP file data"); 3322 return (ARCHIVE_FATAL); 3323 } 3324 p = buff; 3325 while (p <= buff + bytes_avail - 16) { 3326 if (p[3] == 'P') { p += 3; } 3327 else if (p[3] == 'K') { p += 2; } 3328 else if (p[3] == '\007') { p += 1; } 3329 else if (p[3] == '\010' && p[2] == '\007' 3330 && p[1] == 'K' && p[0] == 'P') { 3331 if (zip->entry->flags & LA_USED_ZIP64) 3332 __archive_read_consume(a, 3333 p - buff + 24); 3334 else 3335 __archive_read_consume(a, 3336 p - buff + 16); 3337 return ARCHIVE_OK; 3338 } else { p += 4; } 3339 } 3340 __archive_read_consume(a, p - buff); 3341 } 3342 } 3343} 3344 3345int 3346archive_read_support_format_zip_streamable(struct archive *_a) 3347{ 3348 struct archive_read *a = (struct archive_read *)_a; 3349 struct zip *zip; 3350 int r; 3351 3352 archive_check_magic(_a, ARCHIVE_READ_MAGIC, 3353 ARCHIVE_STATE_NEW, "archive_read_support_format_zip"); 3354 3355 zip = (struct zip *)calloc(1, sizeof(*zip)); 3356 if (zip == NULL) { 3357 archive_set_error(&a->archive, ENOMEM, 3358 "Can't allocate zip data"); 3359 return (ARCHIVE_FATAL); 3360 } 3361 3362 /* Streamable reader doesn't support mac extensions. */ 3363 zip->process_mac_extensions = 0; 3364 3365 /* 3366 * Until enough data has been read, we cannot tell about 3367 * any encrypted entries yet. 3368 */ 3369 zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW; 3370 zip->crc32func = real_crc32; 3371 3372 r = __archive_read_register_format(a, 3373 zip, 3374 "zip", 3375 archive_read_format_zip_streamable_bid, 3376 archive_read_format_zip_options, 3377 archive_read_format_zip_streamable_read_header, 3378 archive_read_format_zip_read_data, 3379 archive_read_format_zip_read_data_skip_streamable, 3380 NULL, 3381 archive_read_format_zip_cleanup, 3382 archive_read_support_format_zip_capabilities_streamable, 3383 archive_read_format_zip_has_encrypted_entries); 3384 3385 if (r != ARCHIVE_OK) 3386 free(zip); 3387 return (ARCHIVE_OK); 3388} 3389 3390/* ------------------------------------------------------------------------ */ 3391 3392/* 3393 * Seeking-mode support 3394 */ 3395 3396static int 3397archive_read_support_format_zip_capabilities_seekable(struct archive_read * a) 3398{ 3399 (void)a; /* UNUSED */ 3400 return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA | 3401 ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA); 3402} 3403 3404/* 3405 * TODO: This is a performance sink because it forces the read core to 3406 * drop buffered data from the start of file, which will then have to 3407 * be re-read again if this bidder loses. 3408 * 3409 * We workaround this a little by passing in the best bid so far so 3410 * that later bidders can do nothing if they know they'll never 3411 * outbid. But we can certainly do better... 3412 */ 3413static int 3414read_eocd(struct zip *zip, const char *p, int64_t current_offset) 3415{ 3416 /* Sanity-check the EOCD we've found. */ 3417 3418 /* This must be the first volume. */ 3419 if (archive_le16dec(p + 4) != 0) 3420 return 0; 3421 /* Central directory must be on this volume. */ 3422 if (archive_le16dec(p + 4) != archive_le16dec(p + 6)) 3423 return 0; 3424 /* All central directory entries must be on this volume. */ 3425 if (archive_le16dec(p + 10) != archive_le16dec(p + 8)) 3426 return 0; 3427 /* Central directory can't extend beyond start of EOCD record. */ 3428 if (archive_le32dec(p + 16) + archive_le32dec(p + 12) 3429 > current_offset) 3430 return 0; 3431 3432 /* Save the central directory location for later use. */ 3433 zip->central_directory_offset = archive_le32dec(p + 16); 3434 3435 /* This is just a tiny bit higher than the maximum 3436 returned by the streaming Zip bidder. This ensures 3437 that the more accurate seeking Zip parser wins 3438 whenever seek is available. */ 3439 return 32; 3440} 3441 3442/* 3443 * Examine Zip64 EOCD locator: If it's valid, store the information 3444 * from it. 3445 */ 3446static int 3447read_zip64_eocd(struct archive_read *a, struct zip *zip, const char *p) 3448{ 3449 int64_t eocd64_offset; 3450 int64_t eocd64_size; 3451 3452 /* Sanity-check the locator record. */ 3453 3454 /* Central dir must be on first volume. */ 3455 if (archive_le32dec(p + 4) != 0) 3456 return 0; 3457 /* Must be only a single volume. */ 3458 if (archive_le32dec(p + 16) != 1) 3459 return 0; 3460 3461 /* Find the Zip64 EOCD record. */ 3462 eocd64_offset = archive_le64dec(p + 8); 3463 if (__archive_read_seek(a, eocd64_offset, SEEK_SET) < 0) 3464 return 0; 3465 if ((p = __archive_read_ahead(a, 56, NULL)) == NULL) 3466 return 0; 3467 /* Make sure we can read all of it. */ 3468 eocd64_size = archive_le64dec(p + 4) + 12; 3469 if (eocd64_size < 56 || eocd64_size > 16384) 3470 return 0; 3471 if ((p = __archive_read_ahead(a, (size_t)eocd64_size, NULL)) == NULL) 3472 return 0; 3473 3474 /* Sanity-check the EOCD64 */ 3475 if (archive_le32dec(p + 16) != 0) /* Must be disk #0 */ 3476 return 0; 3477 if (archive_le32dec(p + 20) != 0) /* CD must be on disk #0 */ 3478 return 0; 3479 /* CD can't be split. */ 3480 if (archive_le64dec(p + 24) != archive_le64dec(p + 32)) 3481 return 0; 3482 3483 /* Save the central directory offset for later use. */ 3484 zip->central_directory_offset = archive_le64dec(p + 48); 3485 3486 return 32; 3487} 3488 3489static int 3490archive_read_format_zip_seekable_bid(struct archive_read *a, int best_bid) 3491{ 3492 struct zip *zip = (struct zip *)a->format->data; 3493 int64_t file_size, current_offset; 3494 const char *p; 3495 int i, tail; 3496 3497 /* If someone has already bid more than 32, then avoid 3498 trashing the look-ahead buffers with a seek. */ 3499 if (best_bid > 32) 3500 return (-1); 3501 3502 file_size = __archive_read_seek(a, 0, SEEK_END); 3503 if (file_size <= 0) 3504 return 0; 3505 3506 /* Search last 16k of file for end-of-central-directory 3507 * record (which starts with PK\005\006) */ 3508 tail = (int)zipmin(1024 * 16, file_size); 3509 current_offset = __archive_read_seek(a, -tail, SEEK_END); 3510 if (current_offset < 0) 3511 return 0; 3512 if ((p = __archive_read_ahead(a, (size_t)tail, NULL)) == NULL) 3513 return 0; 3514 /* Boyer-Moore search backwards from the end, since we want 3515 * to match the last EOCD in the file (there can be more than 3516 * one if there is an uncompressed Zip archive as a member 3517 * within this Zip archive). */ 3518 for (i = tail - 22; i > 0;) { 3519 switch (p[i]) { 3520 case 'P': 3521 if (memcmp(p + i, "PK\005\006", 4) == 0) { 3522 int ret = read_eocd(zip, p + i, 3523 current_offset + i); 3524 /* Zip64 EOCD locator precedes 3525 * regular EOCD if present. */ 3526 if (i >= 20 && memcmp(p + i - 20, "PK\006\007", 4) == 0) { 3527 int ret_zip64 = read_zip64_eocd(a, zip, p + i - 20); 3528 if (ret_zip64 > ret) 3529 ret = ret_zip64; 3530 } 3531 return (ret); 3532 } 3533 i -= 4; 3534 break; 3535 case 'K': i -= 1; break; 3536 case 005: i -= 2; break; 3537 case 006: i -= 3; break; 3538 default: i -= 4; break; 3539 } 3540 } 3541 return 0; 3542} 3543 3544/* The red-black trees are only used in seeking mode to manage 3545 * the in-memory copy of the central directory. */ 3546 3547static int 3548cmp_node(const struct archive_rb_node *n1, const struct archive_rb_node *n2) 3549{ 3550 const struct zip_entry *e1 = (const struct zip_entry *)n1; 3551 const struct zip_entry *e2 = (const struct zip_entry *)n2; 3552 3553 if (e1->local_header_offset > e2->local_header_offset) 3554 return -1; 3555 if (e1->local_header_offset < e2->local_header_offset) 3556 return 1; 3557 return 0; 3558} 3559 3560static int 3561cmp_key(const struct archive_rb_node *n, const void *key) 3562{ 3563 /* This function won't be called */ 3564 (void)n; /* UNUSED */ 3565 (void)key; /* UNUSED */ 3566 return 1; 3567} 3568 3569static const struct archive_rb_tree_ops rb_ops = { 3570 &cmp_node, &cmp_key 3571}; 3572 3573static int 3574rsrc_cmp_node(const struct archive_rb_node *n1, 3575 const struct archive_rb_node *n2) 3576{ 3577 const struct zip_entry *e1 = (const struct zip_entry *)n1; 3578 const struct zip_entry *e2 = (const struct zip_entry *)n2; 3579 3580 return (strcmp(e2->rsrcname.s, e1->rsrcname.s)); 3581} 3582 3583static int 3584rsrc_cmp_key(const struct archive_rb_node *n, const void *key) 3585{ 3586 const struct zip_entry *e = (const struct zip_entry *)n; 3587 return (strcmp((const char *)key, e->rsrcname.s)); 3588} 3589 3590static const struct archive_rb_tree_ops rb_rsrc_ops = { 3591 &rsrc_cmp_node, &rsrc_cmp_key 3592}; 3593 3594static const char * 3595rsrc_basename(const char *name, size_t name_length) 3596{ 3597 const char *s, *r; 3598 3599 r = s = name; 3600 for (;;) { 3601 s = memchr(s, '/', name_length - (s - name)); 3602 if (s == NULL) 3603 break; 3604 r = ++s; 3605 } 3606 return (r); 3607} 3608 3609static void 3610expose_parent_dirs(struct zip *zip, const char *name, size_t name_length) 3611{ 3612 struct archive_string str; 3613 struct zip_entry *dir; 3614 char *s; 3615 3616 archive_string_init(&str); 3617 archive_strncpy(&str, name, name_length); 3618 for (;;) { 3619 s = strrchr(str.s, '/'); 3620 if (s == NULL) 3621 break; 3622 *s = '\0'; 3623 /* Transfer the parent directory from zip->tree_rsrc RB 3624 * tree to zip->tree RB tree to expose. */ 3625 dir = (struct zip_entry *) 3626 __archive_rb_tree_find_node(&zip->tree_rsrc, str.s); 3627 if (dir == NULL) 3628 break; 3629 __archive_rb_tree_remove_node(&zip->tree_rsrc, &dir->node); 3630 archive_string_free(&dir->rsrcname); 3631 __archive_rb_tree_insert_node(&zip->tree, &dir->node); 3632 } 3633 archive_string_free(&str); 3634} 3635 3636static int 3637slurp_central_directory(struct archive_read *a, struct archive_entry* entry, 3638 struct zip *zip) 3639{ 3640 ssize_t i; 3641 unsigned found; 3642 int64_t correction; 3643 ssize_t bytes_avail; 3644 const char *p; 3645 3646 /* 3647 * Find the start of the central directory. The end-of-CD 3648 * record has our starting point, but there are lots of 3649 * Zip archives which have had other data prepended to the 3650 * file, which makes the recorded offsets all too small. 3651 * So we search forward from the specified offset until we 3652 * find the real start of the central directory. Then we 3653 * know the correction we need to apply to account for leading 3654 * padding. 3655 */ 3656 if (__archive_read_seek(a, zip->central_directory_offset, SEEK_SET) < 0) 3657 return ARCHIVE_FATAL; 3658 3659 found = 0; 3660 while (!found) { 3661 if ((p = __archive_read_ahead(a, 20, &bytes_avail)) == NULL) 3662 return ARCHIVE_FATAL; 3663 for (found = 0, i = 0; !found && i < bytes_avail - 4;) { 3664 switch (p[i + 3]) { 3665 case 'P': i += 3; break; 3666 case 'K': i += 2; break; 3667 case 001: i += 1; break; 3668 case 002: 3669 if (memcmp(p + i, "PK\001\002", 4) == 0) { 3670 p += i; 3671 found = 1; 3672 } else 3673 i += 4; 3674 break; 3675 case 005: i += 1; break; 3676 case 006: 3677 if (memcmp(p + i, "PK\005\006", 4) == 0) { 3678 p += i; 3679 found = 1; 3680 } else if (memcmp(p + i, "PK\006\006", 4) == 0) { 3681 p += i; 3682 found = 1; 3683 } else 3684 i += 1; 3685 break; 3686 default: i += 4; break; 3687 } 3688 } 3689 __archive_read_consume(a, i); 3690 } 3691 correction = archive_filter_bytes(&a->archive, 0) 3692 - zip->central_directory_offset; 3693 3694 __archive_rb_tree_init(&zip->tree, &rb_ops); 3695 __archive_rb_tree_init(&zip->tree_rsrc, &rb_rsrc_ops); 3696 3697 zip->central_directory_entries_total = 0; 3698 while (1) { 3699 struct zip_entry *zip_entry; 3700 size_t filename_length, extra_length, comment_length; 3701 uint32_t external_attributes; 3702 const char *name, *r; 3703 3704 if ((p = __archive_read_ahead(a, 4, NULL)) == NULL) 3705 return ARCHIVE_FATAL; 3706 if (memcmp(p, "PK\006\006", 4) == 0 3707 || memcmp(p, "PK\005\006", 4) == 0) { 3708 break; 3709 } else if (memcmp(p, "PK\001\002", 4) != 0) { 3710 archive_set_error(&a->archive, 3711 -1, "Invalid central directory signature"); 3712 return ARCHIVE_FATAL; 3713 } 3714 if ((p = __archive_read_ahead(a, 46, NULL)) == NULL) 3715 return ARCHIVE_FATAL; 3716 3717 zip_entry = calloc(1, sizeof(struct zip_entry)); 3718 if (zip_entry == NULL) { 3719 archive_set_error(&a->archive, ENOMEM, 3720 "Can't allocate zip entry"); 3721 return ARCHIVE_FATAL; 3722 } 3723 zip_entry->next = zip->zip_entries; 3724 zip_entry->flags |= LA_FROM_CENTRAL_DIRECTORY; 3725 zip->zip_entries = zip_entry; 3726 zip->central_directory_entries_total++; 3727 3728 /* version = p[4]; */ 3729 zip_entry->system = p[5]; 3730 /* version_required = archive_le16dec(p + 6); */ 3731 zip_entry->zip_flags = archive_le16dec(p + 8); 3732 if (zip_entry->zip_flags 3733 & (ZIP_ENCRYPTED | ZIP_STRONG_ENCRYPTED)){ 3734 zip->has_encrypted_entries = 1; 3735 } 3736 zip_entry->compression = (char)archive_le16dec(p + 10); 3737 zip_entry->mtime = zip_time(p + 12); 3738 zip_entry->crc32 = archive_le32dec(p + 16); 3739 if (zip_entry->zip_flags & ZIP_LENGTH_AT_END) 3740 zip_entry->decdat = p[13]; 3741 else 3742 zip_entry->decdat = p[19]; 3743 zip_entry->compressed_size = archive_le32dec(p + 20); 3744 zip_entry->uncompressed_size = archive_le32dec(p + 24); 3745 filename_length = archive_le16dec(p + 28); 3746 extra_length = archive_le16dec(p + 30); 3747 comment_length = archive_le16dec(p + 32); 3748 /* disk_start = archive_le16dec(p + 34); 3749 * Better be zero. 3750 * internal_attributes = archive_le16dec(p + 36); 3751 * text bit */ 3752 external_attributes = archive_le32dec(p + 38); 3753 zip_entry->local_header_offset = 3754 archive_le32dec(p + 42) + correction; 3755 3756 /* If we can't guess the mode, leave it zero here; 3757 when we read the local file header we might get 3758 more information. */ 3759 if (zip_entry->system == 3) { 3760 zip_entry->mode = external_attributes >> 16; 3761 } else if (zip_entry->system == 0) { 3762 // Interpret MSDOS directory bit 3763 if (0x10 == (external_attributes & 0x10)) { 3764 zip_entry->mode = AE_IFDIR | 0775; 3765 } else { 3766 zip_entry->mode = AE_IFREG | 0664; 3767 } 3768 if (0x01 == (external_attributes & 0x01)) { 3769 // Read-only bit; strip write permissions 3770 zip_entry->mode &= 0555; 3771 } 3772 } else { 3773 zip_entry->mode = 0; 3774 } 3775 3776 /* We're done with the regular data; get the filename and 3777 * extra data. */ 3778 __archive_read_consume(a, 46); 3779 p = __archive_read_ahead(a, filename_length + extra_length, 3780 NULL); 3781 if (p == NULL) { 3782 archive_set_error(&a->archive, 3783 ARCHIVE_ERRNO_FILE_FORMAT, 3784 "Truncated ZIP file header"); 3785 return ARCHIVE_FATAL; 3786 } 3787 if (ARCHIVE_OK != process_extra(a, entry, p + filename_length, 3788 extra_length, zip_entry)) { 3789 return ARCHIVE_FATAL; 3790 } 3791 3792 /* 3793 * Mac resource fork files are stored under the 3794 * "__MACOSX/" directory, so we should check if 3795 * it is. 3796 */ 3797 if (!zip->process_mac_extensions) { 3798 /* Treat every entry as a regular entry. */ 3799 __archive_rb_tree_insert_node(&zip->tree, 3800 &zip_entry->node); 3801 } else { 3802 name = p; 3803 r = rsrc_basename(name, filename_length); 3804 if (filename_length >= 9 && 3805 strncmp("__MACOSX/", name, 9) == 0) { 3806 /* If this file is not a resource fork nor 3807 * a directory. We should treat it as a non 3808 * resource fork file to expose it. */ 3809 if (name[filename_length-1] != '/' && 3810 (r - name < 3 || r[0] != '.' || 3811 r[1] != '_')) { 3812 __archive_rb_tree_insert_node( 3813 &zip->tree, &zip_entry->node); 3814 /* Expose its parent directories. */ 3815 expose_parent_dirs(zip, name, 3816 filename_length); 3817 } else { 3818 /* This file is a resource fork file or 3819 * a directory. */ 3820 archive_strncpy(&(zip_entry->rsrcname), 3821 name, filename_length); 3822 __archive_rb_tree_insert_node( 3823 &zip->tree_rsrc, &zip_entry->node); 3824 } 3825 } else { 3826 /* Generate resource fork name to find its 3827 * resource file at zip->tree_rsrc. */ 3828 archive_strcpy(&(zip_entry->rsrcname), 3829 "__MACOSX/"); 3830 archive_strncat(&(zip_entry->rsrcname), 3831 name, r - name); 3832 archive_strcat(&(zip_entry->rsrcname), "._"); 3833 archive_strncat(&(zip_entry->rsrcname), 3834 name + (r - name), 3835 filename_length - (r - name)); 3836 /* Register an entry to RB tree to sort it by 3837 * file offset. */ 3838 __archive_rb_tree_insert_node(&zip->tree, 3839 &zip_entry->node); 3840 } 3841 } 3842 3843 /* Skip the comment too ... */ 3844 __archive_read_consume(a, 3845 filename_length + extra_length + comment_length); 3846 } 3847 3848 return ARCHIVE_OK; 3849} 3850 3851static ssize_t 3852zip_get_local_file_header_size(struct archive_read *a, size_t extra) 3853{ 3854 const char *p; 3855 ssize_t filename_length, extra_length; 3856 3857 if ((p = __archive_read_ahead(a, extra + 30, NULL)) == NULL) { 3858 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 3859 "Truncated ZIP file header"); 3860 return (ARCHIVE_WARN); 3861 } 3862 p += extra; 3863 3864 if (memcmp(p, "PK\003\004", 4) != 0) { 3865 archive_set_error(&a->archive, -1, "Damaged Zip archive"); 3866 return ARCHIVE_WARN; 3867 } 3868 filename_length = archive_le16dec(p + 26); 3869 extra_length = archive_le16dec(p + 28); 3870 3871 return (30 + filename_length + extra_length); 3872} 3873 3874static int 3875zip_read_mac_metadata(struct archive_read *a, struct archive_entry *entry, 3876 struct zip_entry *rsrc) 3877{ 3878 struct zip *zip = (struct zip *)a->format->data; 3879 unsigned char *metadata, *mp; 3880 int64_t offset = archive_filter_bytes(&a->archive, 0); 3881 size_t remaining_bytes, metadata_bytes; 3882 ssize_t hsize; 3883 int ret = ARCHIVE_OK, eof; 3884 3885 switch(rsrc->compression) { 3886 case 0: /* No compression. */ 3887 if (rsrc->uncompressed_size != rsrc->compressed_size) { 3888 archive_set_error(&a->archive, 3889 ARCHIVE_ERRNO_FILE_FORMAT, 3890 "Malformed OS X metadata entry: " 3891 "inconsistent size"); 3892 return (ARCHIVE_FATAL); 3893 } 3894#ifdef HAVE_ZLIB_H 3895 case 8: /* Deflate compression. */ 3896#endif 3897 break; 3898 default: /* Unsupported compression. */ 3899 /* Return a warning. */ 3900 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 3901 "Unsupported ZIP compression method (%s)", 3902 compression_name(rsrc->compression)); 3903 /* We can't decompress this entry, but we will 3904 * be able to skip() it and try the next entry. */ 3905 return (ARCHIVE_WARN); 3906 } 3907 3908 if (rsrc->uncompressed_size > (4 * 1024 * 1024)) { 3909 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 3910 "Mac metadata is too large: %jd > 4M bytes", 3911 (intmax_t)rsrc->uncompressed_size); 3912 return (ARCHIVE_WARN); 3913 } 3914 if (rsrc->compressed_size > (4 * 1024 * 1024)) { 3915 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 3916 "Mac metadata is too large: %jd > 4M bytes", 3917 (intmax_t)rsrc->compressed_size); 3918 return (ARCHIVE_WARN); 3919 } 3920 3921 metadata = malloc((size_t)rsrc->uncompressed_size); 3922 if (metadata == NULL) { 3923 archive_set_error(&a->archive, ENOMEM, 3924 "Can't allocate memory for Mac metadata"); 3925 return (ARCHIVE_FATAL); 3926 } 3927 3928 if (offset < rsrc->local_header_offset) 3929 __archive_read_consume(a, rsrc->local_header_offset - offset); 3930 else if (offset != rsrc->local_header_offset) { 3931 __archive_read_seek(a, rsrc->local_header_offset, SEEK_SET); 3932 } 3933 3934 hsize = zip_get_local_file_header_size(a, 0); 3935 __archive_read_consume(a, hsize); 3936 3937 remaining_bytes = (size_t)rsrc->compressed_size; 3938 metadata_bytes = (size_t)rsrc->uncompressed_size; 3939 mp = metadata; 3940 eof = 0; 3941 while (!eof && remaining_bytes) { 3942 const unsigned char *p; 3943 ssize_t bytes_avail; 3944 size_t bytes_used; 3945 3946 p = __archive_read_ahead(a, 1, &bytes_avail); 3947 if (p == NULL) { 3948 archive_set_error(&a->archive, 3949 ARCHIVE_ERRNO_FILE_FORMAT, 3950 "Truncated ZIP file header"); 3951 ret = ARCHIVE_WARN; 3952 goto exit_mac_metadata; 3953 } 3954 if ((size_t)bytes_avail > remaining_bytes) 3955 bytes_avail = remaining_bytes; 3956 switch(rsrc->compression) { 3957 case 0: /* No compression. */ 3958 if ((size_t)bytes_avail > metadata_bytes) 3959 bytes_avail = metadata_bytes; 3960 memcpy(mp, p, bytes_avail); 3961 bytes_used = (size_t)bytes_avail; 3962 metadata_bytes -= bytes_used; 3963 mp += bytes_used; 3964 if (metadata_bytes == 0) 3965 eof = 1; 3966 break; 3967#ifdef HAVE_ZLIB_H 3968 case 8: /* Deflate compression. */ 3969 { 3970 int r; 3971 3972 ret = zip_deflate_init(a, zip); 3973 if (ret != ARCHIVE_OK) 3974 goto exit_mac_metadata; 3975 zip->stream.next_in = 3976 (Bytef *)(uintptr_t)(const void *)p; 3977 zip->stream.avail_in = (uInt)bytes_avail; 3978 zip->stream.total_in = 0; 3979 zip->stream.next_out = mp; 3980 zip->stream.avail_out = (uInt)metadata_bytes; 3981 zip->stream.total_out = 0; 3982 3983 r = inflate(&zip->stream, 0); 3984 switch (r) { 3985 case Z_OK: 3986 break; 3987 case Z_STREAM_END: 3988 eof = 1; 3989 break; 3990 case Z_MEM_ERROR: 3991 archive_set_error(&a->archive, ENOMEM, 3992 "Out of memory for ZIP decompression"); 3993 ret = ARCHIVE_FATAL; 3994 goto exit_mac_metadata; 3995 default: 3996 archive_set_error(&a->archive, 3997 ARCHIVE_ERRNO_MISC, 3998 "ZIP decompression failed (%d)", r); 3999 ret = ARCHIVE_FATAL; 4000 goto exit_mac_metadata; 4001 } 4002 bytes_used = zip->stream.total_in; 4003 metadata_bytes -= zip->stream.total_out; 4004 mp += zip->stream.total_out; 4005 break; 4006 } 4007#endif 4008 default: 4009 bytes_used = 0; 4010 break; 4011 } 4012 __archive_read_consume(a, bytes_used); 4013 remaining_bytes -= bytes_used; 4014 } 4015 archive_entry_copy_mac_metadata(entry, metadata, 4016 (size_t)rsrc->uncompressed_size - metadata_bytes); 4017 4018exit_mac_metadata: 4019 __archive_read_seek(a, offset, SEEK_SET); 4020 zip->decompress_init = 0; 4021 free(metadata); 4022 return (ret); 4023} 4024 4025static int 4026archive_read_format_zip_seekable_read_header(struct archive_read *a, 4027 struct archive_entry *entry) 4028{ 4029 struct zip *zip = (struct zip *)a->format->data; 4030 struct zip_entry *rsrc; 4031 int64_t offset; 4032 int r, ret = ARCHIVE_OK; 4033 4034 /* 4035 * It should be sufficient to call archive_read_next_header() for 4036 * a reader to determine if an entry is encrypted or not. If the 4037 * encryption of an entry is only detectable when calling 4038 * archive_read_data(), so be it. We'll do the same check there 4039 * as well. 4040 */ 4041 if (zip->has_encrypted_entries == 4042 ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) 4043 zip->has_encrypted_entries = 0; 4044 4045 a->archive.archive_format = ARCHIVE_FORMAT_ZIP; 4046 if (a->archive.archive_format_name == NULL) 4047 a->archive.archive_format_name = "ZIP"; 4048 4049 if (zip->zip_entries == NULL) { 4050 r = slurp_central_directory(a, entry, zip); 4051 if (r != ARCHIVE_OK) 4052 return r; 4053 /* Get first entry whose local header offset is lower than 4054 * other entries in the archive file. */ 4055 zip->entry = 4056 (struct zip_entry *)ARCHIVE_RB_TREE_MIN(&zip->tree); 4057 } else if (zip->entry != NULL) { 4058 /* Get next entry in local header offset order. */ 4059 zip->entry = (struct zip_entry *)__archive_rb_tree_iterate( 4060 &zip->tree, &zip->entry->node, ARCHIVE_RB_DIR_RIGHT); 4061 } 4062 4063 if (zip->entry == NULL) 4064 return ARCHIVE_EOF; 4065 4066 if (zip->entry->rsrcname.s) 4067 rsrc = (struct zip_entry *)__archive_rb_tree_find_node( 4068 &zip->tree_rsrc, zip->entry->rsrcname.s); 4069 else 4070 rsrc = NULL; 4071 4072 if (zip->cctx_valid) 4073 archive_decrypto_aes_ctr_release(&zip->cctx); 4074 if (zip->hctx_valid) 4075 archive_hmac_sha1_cleanup(&zip->hctx); 4076 zip->tctx_valid = zip->cctx_valid = zip->hctx_valid = 0; 4077 __archive_read_reset_passphrase(a); 4078 4079 /* File entries are sorted by the header offset, we should mostly 4080 * use __archive_read_consume to advance a read point to avoid 4081 * redundant data reading. */ 4082 offset = archive_filter_bytes(&a->archive, 0); 4083 if (offset < zip->entry->local_header_offset) 4084 __archive_read_consume(a, 4085 zip->entry->local_header_offset - offset); 4086 else if (offset != zip->entry->local_header_offset) { 4087 __archive_read_seek(a, zip->entry->local_header_offset, 4088 SEEK_SET); 4089 } 4090 zip->unconsumed = 0; 4091 r = zip_read_local_file_header(a, entry, zip); 4092 if (r != ARCHIVE_OK) 4093 return r; 4094 if (rsrc) { 4095 int ret2 = zip_read_mac_metadata(a, entry, rsrc); 4096 if (ret2 < ret) 4097 ret = ret2; 4098 } 4099 return (ret); 4100} 4101 4102/* 4103 * We're going to seek for the next header anyway, so we don't 4104 * need to bother doing anything here. 4105 */ 4106static int 4107archive_read_format_zip_read_data_skip_seekable(struct archive_read *a) 4108{ 4109 struct zip *zip; 4110 zip = (struct zip *)(a->format->data); 4111 4112 zip->unconsumed = 0; 4113 return (ARCHIVE_OK); 4114} 4115 4116int 4117archive_read_support_format_zip_seekable(struct archive *_a) 4118{ 4119 struct archive_read *a = (struct archive_read *)_a; 4120 struct zip *zip; 4121 int r; 4122 4123 archive_check_magic(_a, ARCHIVE_READ_MAGIC, 4124 ARCHIVE_STATE_NEW, "archive_read_support_format_zip_seekable"); 4125 4126 zip = (struct zip *)calloc(1, sizeof(*zip)); 4127 if (zip == NULL) { 4128 archive_set_error(&a->archive, ENOMEM, 4129 "Can't allocate zip data"); 4130 return (ARCHIVE_FATAL); 4131 } 4132 4133#ifdef HAVE_COPYFILE_H 4134 /* Set this by default on Mac OS. */ 4135 zip->process_mac_extensions = 1; 4136#endif 4137 4138 /* 4139 * Until enough data has been read, we cannot tell about 4140 * any encrypted entries yet. 4141 */ 4142 zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW; 4143 zip->crc32func = real_crc32; 4144 4145 r = __archive_read_register_format(a, 4146 zip, 4147 "zip", 4148 archive_read_format_zip_seekable_bid, 4149 archive_read_format_zip_options, 4150 archive_read_format_zip_seekable_read_header, 4151 archive_read_format_zip_read_data, 4152 archive_read_format_zip_read_data_skip_seekable, 4153 NULL, 4154 archive_read_format_zip_cleanup, 4155 archive_read_support_format_zip_capabilities_seekable, 4156 archive_read_format_zip_has_encrypted_entries); 4157 4158 if (r != ARCHIVE_OK) 4159 free(zip); 4160 return (ARCHIVE_OK); 4161} 4162 4163/*# vim:set noet:*/ 4164