archive_read_support_format_zip.c revision 346104
1/*- 2 * Copyright (c) 2004-2013 Tim Kientzle 3 * Copyright (c) 2011-2012,2014 Michihiro NAKAJIMA 4 * Copyright (c) 2013 Konrad Kleine 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28#include "archive_platform.h" 29__FBSDID("$FreeBSD: stable/11/contrib/libarchive/libarchive/archive_read_support_format_zip.c 346104 2019-04-10 21:46:06Z 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, const char *p, size_t extra_length, struct zip_entry* zip_entry) 476{ 477 unsigned offset = 0; 478 479 if (extra_length == 0) { 480 return ARCHIVE_OK; 481 } 482 483 if (extra_length < 4) { 484 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 485 "Too-small extra data: Need at least 4 bytes, but only found %d bytes", (int)extra_length); 486 return ARCHIVE_FAILED; 487 } 488 while (offset <= extra_length - 4) { 489 unsigned short headerid = archive_le16dec(p + offset); 490 unsigned short datasize = archive_le16dec(p + offset + 2); 491 492 offset += 4; 493 if (offset + datasize > extra_length) { 494 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 495 "Extra data overflow: Need %d bytes but only found %d bytes", 496 (int)datasize, (int)(extra_length - offset)); 497 return ARCHIVE_FAILED; 498 } 499#ifdef DEBUG 500 fprintf(stderr, "Header id 0x%04x, length %d\n", 501 headerid, datasize); 502#endif 503 switch (headerid) { 504 case 0x0001: 505 /* Zip64 extended information extra field. */ 506 zip_entry->flags |= LA_USED_ZIP64; 507 if (zip_entry->uncompressed_size == 0xffffffff) { 508 uint64_t t = 0; 509 if (datasize < 8 510 || (t = archive_le64dec(p + offset)) > INT64_MAX) { 511 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 512 "Malformed 64-bit uncompressed size"); 513 return ARCHIVE_FAILED; 514 } 515 zip_entry->uncompressed_size = t; 516 offset += 8; 517 datasize -= 8; 518 } 519 if (zip_entry->compressed_size == 0xffffffff) { 520 uint64_t t = 0; 521 if (datasize < 8 522 || (t = archive_le64dec(p + offset)) > INT64_MAX) { 523 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 524 "Malformed 64-bit compressed size"); 525 return ARCHIVE_FAILED; 526 } 527 zip_entry->compressed_size = t; 528 offset += 8; 529 datasize -= 8; 530 } 531 if (zip_entry->local_header_offset == 0xffffffff) { 532 uint64_t t = 0; 533 if (datasize < 8 534 || (t = archive_le64dec(p + offset)) > INT64_MAX) { 535 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 536 "Malformed 64-bit local header offset"); 537 return ARCHIVE_FAILED; 538 } 539 zip_entry->local_header_offset = t; 540 offset += 8; 541 datasize -= 8; 542 } 543 /* archive_le32dec(p + offset) gives disk 544 * on which file starts, but we don't handle 545 * multi-volume Zip files. */ 546 break; 547#ifdef DEBUG 548 case 0x0017: 549 { 550 /* Strong encryption field. */ 551 if (archive_le16dec(p + offset) == 2) { 552 unsigned algId = 553 archive_le16dec(p + offset + 2); 554 unsigned bitLen = 555 archive_le16dec(p + offset + 4); 556 int flags = 557 archive_le16dec(p + offset + 6); 558 fprintf(stderr, "algId=0x%04x, bitLen=%u, " 559 "flgas=%d\n", algId, bitLen,flags); 560 } 561 break; 562 } 563#endif 564 case 0x5455: 565 { 566 /* Extended time field "UT". */ 567 int flags; 568 if (datasize == 0) { 569 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 570 "Incomplete extended time field"); 571 return ARCHIVE_FAILED; 572 } 573 flags = p[offset]; 574 offset++; 575 datasize--; 576 /* Flag bits indicate which dates are present. */ 577 if (flags & 0x01) 578 { 579#ifdef DEBUG 580 fprintf(stderr, "mtime: %lld -> %d\n", 581 (long long)zip_entry->mtime, 582 archive_le32dec(p + offset)); 583#endif 584 if (datasize < 4) 585 break; 586 zip_entry->mtime = archive_le32dec(p + offset); 587 offset += 4; 588 datasize -= 4; 589 } 590 if (flags & 0x02) 591 { 592 if (datasize < 4) 593 break; 594 zip_entry->atime = archive_le32dec(p + offset); 595 offset += 4; 596 datasize -= 4; 597 } 598 if (flags & 0x04) 599 { 600 if (datasize < 4) 601 break; 602 zip_entry->ctime = archive_le32dec(p + offset); 603 offset += 4; 604 datasize -= 4; 605 } 606 break; 607 } 608 case 0x5855: 609 { 610 /* Info-ZIP Unix Extra Field (old version) "UX". */ 611 if (datasize >= 8) { 612 zip_entry->atime = archive_le32dec(p + offset); 613 zip_entry->mtime = 614 archive_le32dec(p + offset + 4); 615 } 616 if (datasize >= 12) { 617 zip_entry->uid = 618 archive_le16dec(p + offset + 8); 619 zip_entry->gid = 620 archive_le16dec(p + offset + 10); 621 } 622 break; 623 } 624 case 0x6c78: 625 { 626 /* Experimental 'xl' field */ 627 /* 628 * Introduced Dec 2013 to provide a way to 629 * include external file attributes (and other 630 * fields that ordinarily appear only in 631 * central directory) in local file header. 632 * This provides file type and permission 633 * information necessary to support full 634 * streaming extraction. Currently being 635 * discussed with other Zip developers 636 * ... subject to change. 637 * 638 * Format: 639 * The field starts with a bitmap that specifies 640 * which additional fields are included. The 641 * bitmap is variable length and can be extended in 642 * the future. 643 * 644 * n bytes - feature bitmap: first byte has low-order 645 * 7 bits. If high-order bit is set, a subsequent 646 * byte holds the next 7 bits, etc. 647 * 648 * if bitmap & 1, 2 byte "version made by" 649 * if bitmap & 2, 2 byte "internal file attributes" 650 * if bitmap & 4, 4 byte "external file attributes" 651 * if bitmap & 8, 2 byte comment length + n byte comment 652 */ 653 int bitmap, bitmap_last; 654 655 if (datasize < 1) 656 break; 657 bitmap_last = bitmap = 0xff & p[offset]; 658 offset += 1; 659 datasize -= 1; 660 661 /* We only support first 7 bits of bitmap; skip rest. */ 662 while ((bitmap_last & 0x80) != 0 663 && datasize >= 1) { 664 bitmap_last = p[offset]; 665 offset += 1; 666 datasize -= 1; 667 } 668 669 if (bitmap & 1) { 670 /* 2 byte "version made by" */ 671 if (datasize < 2) 672 break; 673 zip_entry->system 674 = archive_le16dec(p + offset) >> 8; 675 offset += 2; 676 datasize -= 2; 677 } 678 if (bitmap & 2) { 679 /* 2 byte "internal file attributes" */ 680 uint32_t internal_attributes; 681 if (datasize < 2) 682 break; 683 internal_attributes 684 = archive_le16dec(p + offset); 685 /* Not used by libarchive at present. */ 686 (void)internal_attributes; /* UNUSED */ 687 offset += 2; 688 datasize -= 2; 689 } 690 if (bitmap & 4) { 691 /* 4 byte "external file attributes" */ 692 uint32_t external_attributes; 693 if (datasize < 4) 694 break; 695 external_attributes 696 = archive_le32dec(p + offset); 697 if (zip_entry->system == 3) { 698 zip_entry->mode 699 = external_attributes >> 16; 700 } else if (zip_entry->system == 0) { 701 // Interpret MSDOS directory bit 702 if (0x10 == (external_attributes & 0x10)) { 703 zip_entry->mode = AE_IFDIR | 0775; 704 } else { 705 zip_entry->mode = AE_IFREG | 0664; 706 } 707 if (0x01 == (external_attributes & 0x01)) { 708 // Read-only bit; strip write permissions 709 zip_entry->mode &= 0555; 710 } 711 } else { 712 zip_entry->mode = 0; 713 } 714 offset += 4; 715 datasize -= 4; 716 } 717 if (bitmap & 8) { 718 /* 2 byte comment length + comment */ 719 uint32_t comment_length; 720 if (datasize < 2) 721 break; 722 comment_length 723 = archive_le16dec(p + offset); 724 offset += 2; 725 datasize -= 2; 726 727 if (datasize < comment_length) 728 break; 729 /* Comment is not supported by libarchive */ 730 offset += comment_length; 731 datasize -= comment_length; 732 } 733 break; 734 } 735 case 0x7855: 736 /* Info-ZIP Unix Extra Field (type 2) "Ux". */ 737#ifdef DEBUG 738 fprintf(stderr, "uid %d gid %d\n", 739 archive_le16dec(p + offset), 740 archive_le16dec(p + offset + 2)); 741#endif 742 if (datasize >= 2) 743 zip_entry->uid = archive_le16dec(p + offset); 744 if (datasize >= 4) 745 zip_entry->gid = 746 archive_le16dec(p + offset + 2); 747 break; 748 case 0x7875: 749 { 750 /* Info-Zip Unix Extra Field (type 3) "ux". */ 751 int uidsize = 0, gidsize = 0; 752 753 /* TODO: support arbitrary uidsize/gidsize. */ 754 if (datasize >= 1 && p[offset] == 1) {/* version=1 */ 755 if (datasize >= 4) { 756 /* get a uid size. */ 757 uidsize = 0xff & (int)p[offset+1]; 758 if (uidsize == 2) 759 zip_entry->uid = 760 archive_le16dec( 761 p + offset + 2); 762 else if (uidsize == 4 && datasize >= 6) 763 zip_entry->uid = 764 archive_le32dec( 765 p + offset + 2); 766 } 767 if (datasize >= (2 + uidsize + 3)) { 768 /* get a gid size. */ 769 gidsize = 0xff & (int)p[offset+2+uidsize]; 770 if (gidsize == 2) 771 zip_entry->gid = 772 archive_le16dec( 773 p+offset+2+uidsize+1); 774 else if (gidsize == 4 && 775 datasize >= (2 + uidsize + 5)) 776 zip_entry->gid = 777 archive_le32dec( 778 p+offset+2+uidsize+1); 779 } 780 } 781 break; 782 } 783 case 0x9901: 784 /* WinZip AES extra data field. */ 785 if (datasize < 6) { 786 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 787 "Incomplete AES field"); 788 return ARCHIVE_FAILED; 789 } 790 if (p[offset + 2] == 'A' && p[offset + 3] == 'E') { 791 /* Vendor version. */ 792 zip_entry->aes_extra.vendor = 793 archive_le16dec(p + offset); 794 /* AES encryption strength. */ 795 zip_entry->aes_extra.strength = p[offset + 4]; 796 /* Actual compression method. */ 797 zip_entry->aes_extra.compression = 798 p[offset + 5]; 799 } 800 break; 801 default: 802 break; 803 } 804 offset += datasize; 805 } 806 if (offset != extra_length) { 807 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 808 "Malformed extra data: Consumed %d bytes of %d bytes", 809 (int)offset, (int)extra_length); 810 return ARCHIVE_FAILED; 811 } 812 return ARCHIVE_OK; 813} 814 815/* 816 * Assumes file pointer is at beginning of local file header. 817 */ 818static int 819zip_read_local_file_header(struct archive_read *a, struct archive_entry *entry, 820 struct zip *zip) 821{ 822 const char *p; 823 const void *h; 824 const wchar_t *wp; 825 const char *cp; 826 size_t len, filename_length, extra_length; 827 struct archive_string_conv *sconv; 828 struct zip_entry *zip_entry = zip->entry; 829 struct zip_entry zip_entry_central_dir; 830 int ret = ARCHIVE_OK; 831 char version; 832 833 /* Save a copy of the original for consistency checks. */ 834 zip_entry_central_dir = *zip_entry; 835 836 zip->decompress_init = 0; 837 zip->end_of_entry = 0; 838 zip->entry_uncompressed_bytes_read = 0; 839 zip->entry_compressed_bytes_read = 0; 840 zip->entry_crc32 = zip->crc32func(0, NULL, 0); 841 842 /* Setup default conversion. */ 843 if (zip->sconv == NULL && !zip->init_default_conversion) { 844 zip->sconv_default = 845 archive_string_default_conversion_for_read(&(a->archive)); 846 zip->init_default_conversion = 1; 847 } 848 849 if ((p = __archive_read_ahead(a, 30, NULL)) == NULL) { 850 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 851 "Truncated ZIP file header"); 852 return (ARCHIVE_FATAL); 853 } 854 855 if (memcmp(p, "PK\003\004", 4) != 0) { 856 archive_set_error(&a->archive, -1, "Damaged Zip archive"); 857 return ARCHIVE_FATAL; 858 } 859 version = p[4]; 860 zip_entry->system = p[5]; 861 zip_entry->zip_flags = archive_le16dec(p + 6); 862 if (zip_entry->zip_flags & (ZIP_ENCRYPTED | ZIP_STRONG_ENCRYPTED)) { 863 zip->has_encrypted_entries = 1; 864 archive_entry_set_is_data_encrypted(entry, 1); 865 if (zip_entry->zip_flags & ZIP_CENTRAL_DIRECTORY_ENCRYPTED && 866 zip_entry->zip_flags & ZIP_ENCRYPTED && 867 zip_entry->zip_flags & ZIP_STRONG_ENCRYPTED) { 868 archive_entry_set_is_metadata_encrypted(entry, 1); 869 return ARCHIVE_FATAL; 870 } 871 } 872 zip->init_decryption = (zip_entry->zip_flags & ZIP_ENCRYPTED); 873 zip_entry->compression = (char)archive_le16dec(p + 8); 874 zip_entry->mtime = zip_time(p + 10); 875 zip_entry->crc32 = archive_le32dec(p + 14); 876 if (zip_entry->zip_flags & ZIP_LENGTH_AT_END) 877 zip_entry->decdat = p[11]; 878 else 879 zip_entry->decdat = p[17]; 880 zip_entry->compressed_size = archive_le32dec(p + 18); 881 zip_entry->uncompressed_size = archive_le32dec(p + 22); 882 filename_length = archive_le16dec(p + 26); 883 extra_length = archive_le16dec(p + 28); 884 885 __archive_read_consume(a, 30); 886 887 /* Read the filename. */ 888 if ((h = __archive_read_ahead(a, filename_length, NULL)) == NULL) { 889 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 890 "Truncated ZIP file header"); 891 return (ARCHIVE_FATAL); 892 } 893 if (zip_entry->zip_flags & ZIP_UTF8_NAME) { 894 /* The filename is stored to be UTF-8. */ 895 if (zip->sconv_utf8 == NULL) { 896 zip->sconv_utf8 = 897 archive_string_conversion_from_charset( 898 &a->archive, "UTF-8", 1); 899 if (zip->sconv_utf8 == NULL) 900 return (ARCHIVE_FATAL); 901 } 902 sconv = zip->sconv_utf8; 903 } else if (zip->sconv != NULL) 904 sconv = zip->sconv; 905 else 906 sconv = zip->sconv_default; 907 908 if (archive_entry_copy_pathname_l(entry, 909 h, filename_length, sconv) != 0) { 910 if (errno == ENOMEM) { 911 archive_set_error(&a->archive, ENOMEM, 912 "Can't allocate memory for Pathname"); 913 return (ARCHIVE_FATAL); 914 } 915 archive_set_error(&a->archive, 916 ARCHIVE_ERRNO_FILE_FORMAT, 917 "Pathname cannot be converted " 918 "from %s to current locale.", 919 archive_string_conversion_charset_name(sconv)); 920 ret = ARCHIVE_WARN; 921 } 922 __archive_read_consume(a, filename_length); 923 924 /* Read the extra data. */ 925 if ((h = __archive_read_ahead(a, extra_length, NULL)) == NULL) { 926 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 927 "Truncated ZIP file header"); 928 return (ARCHIVE_FATAL); 929 } 930 931 if (ARCHIVE_OK != process_extra(a, h, extra_length, zip_entry)) { 932 return ARCHIVE_FATAL; 933 } 934 __archive_read_consume(a, extra_length); 935 936 /* Work around a bug in Info-Zip: When reading from a pipe, it 937 * stats the pipe instead of synthesizing a file entry. */ 938 if ((zip_entry->mode & AE_IFMT) == AE_IFIFO) { 939 zip_entry->mode &= ~ AE_IFMT; 940 zip_entry->mode |= AE_IFREG; 941 } 942 943 /* If the mode is totally empty, set some sane default. */ 944 if (zip_entry->mode == 0) { 945 zip_entry->mode |= 0664; 946 } 947 948 /* Windows archivers sometimes use backslash as the directory separator. 949 Normalize to slash. */ 950 if (zip_entry->system == 0 && 951 (wp = archive_entry_pathname_w(entry)) != NULL) { 952 if (wcschr(wp, L'/') == NULL && wcschr(wp, L'\\') != NULL) { 953 size_t i; 954 struct archive_wstring s; 955 archive_string_init(&s); 956 archive_wstrcpy(&s, wp); 957 for (i = 0; i < archive_strlen(&s); i++) { 958 if (s.s[i] == '\\') 959 s.s[i] = '/'; 960 } 961 archive_entry_copy_pathname_w(entry, s.s); 962 archive_wstring_free(&s); 963 } 964 } 965 966 /* Make sure that entries with a trailing '/' are marked as directories 967 * even if the External File Attributes contains bogus values. If this 968 * is not a directory and there is no type, assume regularfile. */ 969 if ((zip_entry->mode & AE_IFMT) != AE_IFDIR) { 970 int has_slash; 971 972 wp = archive_entry_pathname_w(entry); 973 if (wp != NULL) { 974 len = wcslen(wp); 975 has_slash = len > 0 && wp[len - 1] == L'/'; 976 } else { 977 cp = archive_entry_pathname(entry); 978 len = (cp != NULL)?strlen(cp):0; 979 has_slash = len > 0 && cp[len - 1] == '/'; 980 } 981 /* Correct file type as needed. */ 982 if (has_slash) { 983 zip_entry->mode &= ~AE_IFMT; 984 zip_entry->mode |= AE_IFDIR; 985 zip_entry->mode |= 0111; 986 } else if ((zip_entry->mode & AE_IFMT) == 0) { 987 zip_entry->mode |= AE_IFREG; 988 } 989 } 990 991 /* Make sure directories end in '/' */ 992 if ((zip_entry->mode & AE_IFMT) == AE_IFDIR) { 993 wp = archive_entry_pathname_w(entry); 994 if (wp != NULL) { 995 len = wcslen(wp); 996 if (len > 0 && wp[len - 1] != L'/') { 997 struct archive_wstring s; 998 archive_string_init(&s); 999 archive_wstrcat(&s, wp); 1000 archive_wstrappend_wchar(&s, L'/'); 1001 archive_entry_copy_pathname_w(entry, s.s); 1002 archive_wstring_free(&s); 1003 } 1004 } else { 1005 cp = archive_entry_pathname(entry); 1006 len = (cp != NULL)?strlen(cp):0; 1007 if (len > 0 && cp[len - 1] != '/') { 1008 struct archive_string s; 1009 archive_string_init(&s); 1010 archive_strcat(&s, cp); 1011 archive_strappend_char(&s, '/'); 1012 archive_entry_set_pathname(entry, s.s); 1013 archive_string_free(&s); 1014 } 1015 } 1016 } 1017 1018 if (zip_entry->flags & LA_FROM_CENTRAL_DIRECTORY) { 1019 /* If this came from the central dir, it's size info 1020 * is definitive, so ignore the length-at-end flag. */ 1021 zip_entry->zip_flags &= ~ZIP_LENGTH_AT_END; 1022 /* If local header is missing a value, use the one from 1023 the central directory. If both have it, warn about 1024 mismatches. */ 1025 if (zip_entry->crc32 == 0) { 1026 zip_entry->crc32 = zip_entry_central_dir.crc32; 1027 } else if (!zip->ignore_crc32 1028 && zip_entry->crc32 != zip_entry_central_dir.crc32) { 1029 archive_set_error(&a->archive, 1030 ARCHIVE_ERRNO_FILE_FORMAT, 1031 "Inconsistent CRC32 values"); 1032 ret = ARCHIVE_WARN; 1033 } 1034 if (zip_entry->compressed_size == 0) { 1035 zip_entry->compressed_size 1036 = zip_entry_central_dir.compressed_size; 1037 } else if (zip_entry->compressed_size 1038 != zip_entry_central_dir.compressed_size) { 1039 archive_set_error(&a->archive, 1040 ARCHIVE_ERRNO_FILE_FORMAT, 1041 "Inconsistent compressed size: " 1042 "%jd in central directory, %jd in local header", 1043 (intmax_t)zip_entry_central_dir.compressed_size, 1044 (intmax_t)zip_entry->compressed_size); 1045 ret = ARCHIVE_WARN; 1046 } 1047 if (zip_entry->uncompressed_size == 0) { 1048 zip_entry->uncompressed_size 1049 = zip_entry_central_dir.uncompressed_size; 1050 } else if (zip_entry->uncompressed_size 1051 != zip_entry_central_dir.uncompressed_size) { 1052 archive_set_error(&a->archive, 1053 ARCHIVE_ERRNO_FILE_FORMAT, 1054 "Inconsistent uncompressed size: " 1055 "%jd in central directory, %jd in local header", 1056 (intmax_t)zip_entry_central_dir.uncompressed_size, 1057 (intmax_t)zip_entry->uncompressed_size); 1058 ret = ARCHIVE_WARN; 1059 } 1060 } 1061 1062 /* Populate some additional entry fields: */ 1063 archive_entry_set_mode(entry, zip_entry->mode); 1064 archive_entry_set_uid(entry, zip_entry->uid); 1065 archive_entry_set_gid(entry, zip_entry->gid); 1066 archive_entry_set_mtime(entry, zip_entry->mtime, 0); 1067 archive_entry_set_ctime(entry, zip_entry->ctime, 0); 1068 archive_entry_set_atime(entry, zip_entry->atime, 0); 1069 1070 if ((zip->entry->mode & AE_IFMT) == AE_IFLNK) { 1071 size_t linkname_length; 1072 1073 if (zip_entry->compressed_size > 64 * 1024) { 1074 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1075 "Zip file with oversized link entry"); 1076 return ARCHIVE_FATAL; 1077 } 1078 1079 linkname_length = (size_t)zip_entry->compressed_size; 1080 1081 archive_entry_set_size(entry, 0); 1082 p = __archive_read_ahead(a, linkname_length, NULL); 1083 if (p == NULL) { 1084 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1085 "Truncated Zip file"); 1086 return ARCHIVE_FATAL; 1087 } 1088 1089 sconv = zip->sconv; 1090 if (sconv == NULL && (zip->entry->zip_flags & ZIP_UTF8_NAME)) 1091 sconv = zip->sconv_utf8; 1092 if (sconv == NULL) 1093 sconv = zip->sconv_default; 1094 if (archive_entry_copy_symlink_l(entry, p, linkname_length, 1095 sconv) != 0) { 1096 if (errno != ENOMEM && sconv == zip->sconv_utf8 && 1097 (zip->entry->zip_flags & ZIP_UTF8_NAME)) 1098 archive_entry_copy_symlink_l(entry, p, 1099 linkname_length, NULL); 1100 if (errno == ENOMEM) { 1101 archive_set_error(&a->archive, ENOMEM, 1102 "Can't allocate memory for Symlink"); 1103 return (ARCHIVE_FATAL); 1104 } 1105 /* 1106 * Since there is no character-set regulation for 1107 * symlink name, do not report the conversion error 1108 * in an automatic conversion. 1109 */ 1110 if (sconv != zip->sconv_utf8 || 1111 (zip->entry->zip_flags & ZIP_UTF8_NAME) == 0) { 1112 archive_set_error(&a->archive, 1113 ARCHIVE_ERRNO_FILE_FORMAT, 1114 "Symlink cannot be converted " 1115 "from %s to current locale.", 1116 archive_string_conversion_charset_name( 1117 sconv)); 1118 ret = ARCHIVE_WARN; 1119 } 1120 } 1121 zip_entry->uncompressed_size = zip_entry->compressed_size = 0; 1122 1123 if (__archive_read_consume(a, linkname_length) < 0) { 1124 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1125 "Read error skipping symlink target name"); 1126 return ARCHIVE_FATAL; 1127 } 1128 } else if (0 == (zip_entry->zip_flags & ZIP_LENGTH_AT_END) 1129 || zip_entry->uncompressed_size > 0) { 1130 /* Set the size only if it's meaningful. */ 1131 archive_entry_set_size(entry, zip_entry->uncompressed_size); 1132 } 1133 zip->entry_bytes_remaining = zip_entry->compressed_size; 1134 1135 /* If there's no body, force read_data() to return EOF immediately. */ 1136 if (0 == (zip_entry->zip_flags & ZIP_LENGTH_AT_END) 1137 && zip->entry_bytes_remaining < 1) 1138 zip->end_of_entry = 1; 1139 1140 /* Set up a more descriptive format name. */ 1141 archive_string_empty(&zip->format_name); 1142 archive_string_sprintf(&zip->format_name, "ZIP %d.%d (%s)", 1143 version / 10, version % 10, 1144 compression_name(zip->entry->compression)); 1145 a->archive.archive_format_name = zip->format_name.s; 1146 1147 return (ret); 1148} 1149 1150static int 1151check_authentication_code(struct archive_read *a, const void *_p) 1152{ 1153 struct zip *zip = (struct zip *)(a->format->data); 1154 1155 /* Check authentication code. */ 1156 if (zip->hctx_valid) { 1157 const void *p; 1158 uint8_t hmac[20]; 1159 size_t hmac_len = 20; 1160 int cmp; 1161 1162 archive_hmac_sha1_final(&zip->hctx, hmac, &hmac_len); 1163 if (_p == NULL) { 1164 /* Read authentication code. */ 1165 p = __archive_read_ahead(a, AUTH_CODE_SIZE, NULL); 1166 if (p == NULL) { 1167 archive_set_error(&a->archive, 1168 ARCHIVE_ERRNO_FILE_FORMAT, 1169 "Truncated ZIP file data"); 1170 return (ARCHIVE_FATAL); 1171 } 1172 } else { 1173 p = _p; 1174 } 1175 cmp = memcmp(hmac, p, AUTH_CODE_SIZE); 1176 __archive_read_consume(a, AUTH_CODE_SIZE); 1177 if (cmp != 0) { 1178 archive_set_error(&a->archive, 1179 ARCHIVE_ERRNO_MISC, 1180 "ZIP bad Authentication code"); 1181 return (ARCHIVE_WARN); 1182 } 1183 } 1184 return (ARCHIVE_OK); 1185} 1186 1187/* 1188 * Read "uncompressed" data. There are three cases: 1189 * 1) We know the size of the data. This is always true for the 1190 * seeking reader (we've examined the Central Directory already). 1191 * 2) ZIP_LENGTH_AT_END was set, but only the CRC was deferred. 1192 * Info-ZIP seems to do this; we know the size but have to grab 1193 * the CRC from the data descriptor afterwards. 1194 * 3) We're streaming and ZIP_LENGTH_AT_END was specified and 1195 * we have no size information. In this case, we can do pretty 1196 * well by watching for the data descriptor record. The data 1197 * descriptor is 16 bytes and includes a computed CRC that should 1198 * provide a strong check. 1199 * 1200 * TODO: Technically, the PK\007\010 signature is optional. 1201 * In the original spec, the data descriptor contained CRC 1202 * and size fields but had no leading signature. In practice, 1203 * newer writers seem to provide the signature pretty consistently. 1204 * 1205 * For uncompressed data, the PK\007\010 marker seems essential 1206 * to be sure we've actually seen the end of the entry. 1207 * 1208 * Returns ARCHIVE_OK if successful, ARCHIVE_FATAL otherwise, sets 1209 * zip->end_of_entry if it consumes all of the data. 1210 */ 1211static int 1212zip_read_data_none(struct archive_read *a, const void **_buff, 1213 size_t *size, int64_t *offset) 1214{ 1215 struct zip *zip; 1216 const char *buff; 1217 ssize_t bytes_avail; 1218 int r; 1219 1220 (void)offset; /* UNUSED */ 1221 1222 zip = (struct zip *)(a->format->data); 1223 1224 if (zip->entry->zip_flags & ZIP_LENGTH_AT_END) { 1225 const char *p; 1226 ssize_t grabbing_bytes = 24; 1227 1228 if (zip->hctx_valid) 1229 grabbing_bytes += AUTH_CODE_SIZE; 1230 /* Grab at least 24 bytes. */ 1231 buff = __archive_read_ahead(a, grabbing_bytes, &bytes_avail); 1232 if (bytes_avail < grabbing_bytes) { 1233 /* Zip archives have end-of-archive markers 1234 that are longer than this, so a failure to get at 1235 least 24 bytes really does indicate a truncated 1236 file. */ 1237 archive_set_error(&a->archive, 1238 ARCHIVE_ERRNO_FILE_FORMAT, 1239 "Truncated ZIP file data"); 1240 return (ARCHIVE_FATAL); 1241 } 1242 /* Check for a complete PK\007\010 signature, followed 1243 * by the correct 4-byte CRC. */ 1244 p = buff; 1245 if (zip->hctx_valid) 1246 p += AUTH_CODE_SIZE; 1247 if (p[0] == 'P' && p[1] == 'K' 1248 && p[2] == '\007' && p[3] == '\010' 1249 && (archive_le32dec(p + 4) == zip->entry_crc32 1250 || zip->ignore_crc32 1251 || (zip->hctx_valid 1252 && zip->entry->aes_extra.vendor == AES_VENDOR_AE_2))) { 1253 if (zip->entry->flags & LA_USED_ZIP64) { 1254 uint64_t compressed, uncompressed; 1255 zip->entry->crc32 = archive_le32dec(p + 4); 1256 compressed = archive_le64dec(p + 8); 1257 uncompressed = archive_le64dec(p + 16); 1258 if (compressed > INT64_MAX || uncompressed > INT64_MAX) { 1259 archive_set_error(&a->archive, 1260 ARCHIVE_ERRNO_FILE_FORMAT, 1261 "Overflow of 64-bit file sizes"); 1262 return ARCHIVE_FAILED; 1263 } 1264 zip->entry->compressed_size = compressed; 1265 zip->entry->uncompressed_size = uncompressed; 1266 zip->unconsumed = 24; 1267 } else { 1268 zip->entry->crc32 = archive_le32dec(p + 4); 1269 zip->entry->compressed_size = 1270 archive_le32dec(p + 8); 1271 zip->entry->uncompressed_size = 1272 archive_le32dec(p + 12); 1273 zip->unconsumed = 16; 1274 } 1275 if (zip->hctx_valid) { 1276 r = check_authentication_code(a, buff); 1277 if (r != ARCHIVE_OK) 1278 return (r); 1279 } 1280 zip->end_of_entry = 1; 1281 return (ARCHIVE_OK); 1282 } 1283 /* If not at EOF, ensure we consume at least one byte. */ 1284 ++p; 1285 1286 /* Scan forward until we see where a PK\007\010 signature 1287 * might be. */ 1288 /* Return bytes up until that point. On the next call, 1289 * the code above will verify the data descriptor. */ 1290 while (p < buff + bytes_avail - 4) { 1291 if (p[3] == 'P') { p += 3; } 1292 else if (p[3] == 'K') { p += 2; } 1293 else if (p[3] == '\007') { p += 1; } 1294 else if (p[3] == '\010' && p[2] == '\007' 1295 && p[1] == 'K' && p[0] == 'P') { 1296 if (zip->hctx_valid) 1297 p -= AUTH_CODE_SIZE; 1298 break; 1299 } else { p += 4; } 1300 } 1301 bytes_avail = p - buff; 1302 } else { 1303 if (zip->entry_bytes_remaining == 0) { 1304 zip->end_of_entry = 1; 1305 if (zip->hctx_valid) { 1306 r = check_authentication_code(a, NULL); 1307 if (r != ARCHIVE_OK) 1308 return (r); 1309 } 1310 return (ARCHIVE_OK); 1311 } 1312 /* Grab a bunch of bytes. */ 1313 buff = __archive_read_ahead(a, 1, &bytes_avail); 1314 if (bytes_avail <= 0) { 1315 archive_set_error(&a->archive, 1316 ARCHIVE_ERRNO_FILE_FORMAT, 1317 "Truncated ZIP file data"); 1318 return (ARCHIVE_FATAL); 1319 } 1320 if (bytes_avail > zip->entry_bytes_remaining) 1321 bytes_avail = (ssize_t)zip->entry_bytes_remaining; 1322 } 1323 if (zip->tctx_valid || zip->cctx_valid) { 1324 size_t dec_size = bytes_avail; 1325 1326 if (dec_size > zip->decrypted_buffer_size) 1327 dec_size = zip->decrypted_buffer_size; 1328 if (zip->tctx_valid) { 1329 trad_enc_decrypt_update(&zip->tctx, 1330 (const uint8_t *)buff, dec_size, 1331 zip->decrypted_buffer, dec_size); 1332 } else { 1333 size_t dsize = dec_size; 1334 archive_hmac_sha1_update(&zip->hctx, 1335 (const uint8_t *)buff, dec_size); 1336 archive_decrypto_aes_ctr_update(&zip->cctx, 1337 (const uint8_t *)buff, dec_size, 1338 zip->decrypted_buffer, &dsize); 1339 } 1340 bytes_avail = dec_size; 1341 buff = (const char *)zip->decrypted_buffer; 1342 } 1343 *size = bytes_avail; 1344 zip->entry_bytes_remaining -= bytes_avail; 1345 zip->entry_uncompressed_bytes_read += bytes_avail; 1346 zip->entry_compressed_bytes_read += bytes_avail; 1347 zip->unconsumed += bytes_avail; 1348 *_buff = buff; 1349 return (ARCHIVE_OK); 1350} 1351 1352static int 1353consume_optional_marker(struct archive_read *a, struct zip *zip) 1354{ 1355 if (zip->end_of_entry && (zip->entry->zip_flags & ZIP_LENGTH_AT_END)) { 1356 const char *p; 1357 1358 if (NULL == (p = __archive_read_ahead(a, 24, NULL))) { 1359 archive_set_error(&a->archive, 1360 ARCHIVE_ERRNO_FILE_FORMAT, 1361 "Truncated ZIP end-of-file record"); 1362 return (ARCHIVE_FATAL); 1363 } 1364 /* Consume the optional PK\007\010 marker. */ 1365 if (p[0] == 'P' && p[1] == 'K' && 1366 p[2] == '\007' && p[3] == '\010') { 1367 p += 4; 1368 zip->unconsumed = 4; 1369 } 1370 if (zip->entry->flags & LA_USED_ZIP64) { 1371 uint64_t compressed, uncompressed; 1372 zip->entry->crc32 = archive_le32dec(p); 1373 compressed = archive_le64dec(p + 4); 1374 uncompressed = archive_le64dec(p + 12); 1375 if (compressed > INT64_MAX || uncompressed > INT64_MAX) { 1376 archive_set_error(&a->archive, 1377 ARCHIVE_ERRNO_FILE_FORMAT, 1378 "Overflow of 64-bit file sizes"); 1379 return ARCHIVE_FAILED; 1380 } 1381 zip->entry->compressed_size = compressed; 1382 zip->entry->uncompressed_size = uncompressed; 1383 zip->unconsumed += 20; 1384 } else { 1385 zip->entry->crc32 = archive_le32dec(p); 1386 zip->entry->compressed_size = archive_le32dec(p + 4); 1387 zip->entry->uncompressed_size = archive_le32dec(p + 8); 1388 zip->unconsumed += 12; 1389 } 1390 } 1391 1392 return (ARCHIVE_OK); 1393} 1394 1395#if HAVE_LZMA_H && HAVE_LIBLZMA 1396static int 1397zipx_xz_init(struct archive_read *a, struct zip *zip) 1398{ 1399 lzma_ret r; 1400 1401 if(zip->zipx_lzma_valid) { 1402 lzma_end(&zip->zipx_lzma_stream); 1403 zip->zipx_lzma_valid = 0; 1404 } 1405 1406 memset(&zip->zipx_lzma_stream, 0, sizeof(zip->zipx_lzma_stream)); 1407 r = lzma_stream_decoder(&zip->zipx_lzma_stream, UINT64_MAX, 0); 1408 if (r != LZMA_OK) { 1409 archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC, 1410 "xz initialization failed(%d)", 1411 r); 1412 1413 return (ARCHIVE_FAILED); 1414 } 1415 1416 zip->zipx_lzma_valid = 1; 1417 1418 free(zip->uncompressed_buffer); 1419 1420 zip->uncompressed_buffer_size = 256 * 1024; 1421 zip->uncompressed_buffer = 1422 (uint8_t*) malloc(zip->uncompressed_buffer_size); 1423 if (zip->uncompressed_buffer == NULL) { 1424 archive_set_error(&a->archive, ENOMEM, 1425 "No memory for xz decompression"); 1426 return (ARCHIVE_FATAL); 1427 } 1428 1429 zip->decompress_init = 1; 1430 return (ARCHIVE_OK); 1431} 1432 1433static int 1434zipx_lzma_alone_init(struct archive_read *a, struct zip *zip) 1435{ 1436 lzma_ret r; 1437 const uint8_t* p; 1438 1439#pragma pack(push) 1440#pragma pack(1) 1441 struct _alone_header { 1442 uint8_t bytes[5]; 1443 uint64_t uncompressed_size; 1444 } alone_header; 1445#pragma pack(pop) 1446 1447 /* To unpack ZIPX's "LZMA" (id 14) stream we can use standard liblzma that 1448 * is a part of XZ Utils. The stream format stored inside ZIPX file is a 1449 * modified "lzma alone" file format, that was used by the `lzma` utility 1450 * which was later deprecated in favour of `xz` utility. Since those 1451 * formats are nearly the same, we can use a standard "lzma alone" decoder 1452 * from XZ Utils. */ 1453 1454 memset(&zip->zipx_lzma_stream, 0, sizeof(zip->zipx_lzma_stream)); 1455 r = lzma_alone_decoder(&zip->zipx_lzma_stream, UINT64_MAX); 1456 if (r != LZMA_OK) { 1457 archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC, 1458 "lzma initialization failed(%d)", r); 1459 1460 return (ARCHIVE_FAILED); 1461 } 1462 1463 /* Flag the cleanup function that we want our lzma-related structures 1464 * to be freed later. */ 1465 zip->zipx_lzma_valid = 1; 1466 1467 /* The "lzma alone" file format and the stream format inside ZIPx are 1468 * almost the same. Here's an example of a structure of "lzma alone" 1469 * format: 1470 * 1471 * $ cat /bin/ls | lzma | xxd | head -n 1 1472 * 00000000: 5d00 0080 00ff ffff ffff ffff ff00 2814 1473 * 1474 * 5 bytes 8 bytes n bytes 1475 * <lzma_params><uncompressed_size><data...> 1476 * 1477 * lzma_params is a 5-byte blob that has to be decoded to extract 1478 * parameters of this LZMA stream. The uncompressed_size field is an 1479 * uint64_t value that contains information about the size of the 1480 * uncompressed file, or UINT64_MAX if this value is unknown. The <data...> 1481 * part is the actual lzma-compressed data stream. 1482 * 1483 * Now here's the structure of the stream inside the ZIPX file: 1484 * 1485 * $ cat stream_inside_zipx | xxd | head -n 1 1486 * 00000000: 0914 0500 5d00 8000 0000 2814 .... .... 1487 * 1488 * 2byte 2byte 5 bytes n bytes 1489 * <magic1><magic2><lzma_params><data...> 1490 * 1491 * This means that the ZIPX file contains an additional magic1 and magic2 1492 * headers, the lzma_params field contains the same parameter set as in the 1493 * "lzma alone" format, and the <data...> field is the same as in the "lzma 1494 * alone" format as well. Note that also the zipx format is missing the 1495 * uncompressed_size field. 1496 * 1497 * So, in order to use the "lzma alone" decoder for the zipx lzma stream, 1498 * we simply need to shuffle around some fields, prepare a new lzma alone 1499 * header, feed it into lzma alone decoder so it will initialize itself 1500 * properly, and then we can start feeding normal zipx lzma stream into the 1501 * decoder. 1502 */ 1503 1504 /* Read magic1,magic2,lzma_params from the ZIPX stream. */ 1505 if((p = __archive_read_ahead(a, 9, NULL)) == NULL) { 1506 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1507 "Truncated lzma data"); 1508 return (ARCHIVE_FATAL); 1509 } 1510 1511 if(p[2] != 0x05 || p[3] != 0x00) { 1512 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1513 "Invalid lzma data"); 1514 return (ARCHIVE_FATAL); 1515 } 1516 1517 /* Prepare an lzma alone header: copy the lzma_params blob into a proper 1518 * place into the lzma alone header. */ 1519 memcpy(&alone_header.bytes[0], p + 4, 5); 1520 1521 /* Initialize the 'uncompressed size' field to unknown; we'll manually 1522 * monitor how many bytes there are still to be uncompressed. */ 1523 alone_header.uncompressed_size = UINT64_MAX; 1524 1525 if(!zip->uncompressed_buffer) { 1526 zip->uncompressed_buffer_size = 256 * 1024; 1527 zip->uncompressed_buffer = 1528 (uint8_t*) malloc(zip->uncompressed_buffer_size); 1529 1530 if (zip->uncompressed_buffer == NULL) { 1531 archive_set_error(&a->archive, ENOMEM, 1532 "No memory for lzma decompression"); 1533 return (ARCHIVE_FATAL); 1534 } 1535 } 1536 1537 zip->zipx_lzma_stream.next_in = (void*) &alone_header; 1538 zip->zipx_lzma_stream.avail_in = sizeof(alone_header); 1539 zip->zipx_lzma_stream.total_in = 0; 1540 zip->zipx_lzma_stream.next_out = zip->uncompressed_buffer; 1541 zip->zipx_lzma_stream.avail_out = zip->uncompressed_buffer_size; 1542 zip->zipx_lzma_stream.total_out = 0; 1543 1544 /* Feed only the header into the lzma alone decoder. This will effectively 1545 * initialize the decoder, and will not produce any output bytes yet. */ 1546 r = lzma_code(&zip->zipx_lzma_stream, LZMA_RUN); 1547 if (r != LZMA_OK) { 1548 archive_set_error(&a->archive, ARCHIVE_ERRNO_PROGRAMMER, 1549 "lzma stream initialization error"); 1550 return ARCHIVE_FATAL; 1551 } 1552 1553 /* We've already consumed some bytes, so take this into account. */ 1554 __archive_read_consume(a, 9); 1555 zip->entry_bytes_remaining -= 9; 1556 zip->entry_compressed_bytes_read += 9; 1557 1558 zip->decompress_init = 1; 1559 return (ARCHIVE_OK); 1560} 1561 1562static int 1563zip_read_data_zipx_xz(struct archive_read *a, const void **buff, 1564 size_t *size, int64_t *offset) 1565{ 1566 struct zip* zip = (struct zip *)(a->format->data); 1567 int ret; 1568 lzma_ret lz_ret; 1569 const void* compressed_buf; 1570 ssize_t bytes_avail, in_bytes, to_consume = 0; 1571 1572 (void) offset; /* UNUSED */ 1573 1574 /* Initialize decompressor if not yet initialized. */ 1575 if (!zip->decompress_init) { 1576 ret = zipx_xz_init(a, zip); 1577 if (ret != ARCHIVE_OK) 1578 return (ret); 1579 } 1580 1581 compressed_buf = __archive_read_ahead(a, 1, &bytes_avail); 1582 if (bytes_avail < 0) { 1583 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1584 "Truncated xz file body"); 1585 return (ARCHIVE_FATAL); 1586 } 1587 1588 in_bytes = zipmin(zip->entry_bytes_remaining, bytes_avail); 1589 zip->zipx_lzma_stream.next_in = compressed_buf; 1590 zip->zipx_lzma_stream.avail_in = in_bytes; 1591 zip->zipx_lzma_stream.total_in = 0; 1592 zip->zipx_lzma_stream.next_out = zip->uncompressed_buffer; 1593 zip->zipx_lzma_stream.avail_out = zip->uncompressed_buffer_size; 1594 zip->zipx_lzma_stream.total_out = 0; 1595 1596 /* Perform the decompression. */ 1597 lz_ret = lzma_code(&zip->zipx_lzma_stream, LZMA_RUN); 1598 switch(lz_ret) { 1599 case LZMA_DATA_ERROR: 1600 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1601 "xz data error (error %d)", (int) lz_ret); 1602 return (ARCHIVE_FATAL); 1603 1604 case LZMA_NO_CHECK: 1605 case LZMA_OK: 1606 break; 1607 1608 default: 1609 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1610 "xz unknown error %d", (int) lz_ret); 1611 return (ARCHIVE_FATAL); 1612 1613 case LZMA_STREAM_END: 1614 lzma_end(&zip->zipx_lzma_stream); 1615 zip->zipx_lzma_valid = 0; 1616 1617 if((int64_t) zip->zipx_lzma_stream.total_in != 1618 zip->entry_bytes_remaining) 1619 { 1620 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1621 "xz premature end of stream"); 1622 return (ARCHIVE_FATAL); 1623 } 1624 1625 zip->end_of_entry = 1; 1626 break; 1627 } 1628 1629 to_consume = zip->zipx_lzma_stream.total_in; 1630 1631 __archive_read_consume(a, to_consume); 1632 zip->entry_bytes_remaining -= to_consume; 1633 zip->entry_compressed_bytes_read += to_consume; 1634 zip->entry_uncompressed_bytes_read += zip->zipx_lzma_stream.total_out; 1635 1636 *size = zip->zipx_lzma_stream.total_out; 1637 *buff = zip->uncompressed_buffer; 1638 1639 ret = consume_optional_marker(a, zip); 1640 if (ret != ARCHIVE_OK) 1641 return (ret); 1642 1643 return (ARCHIVE_OK); 1644} 1645 1646static int 1647zip_read_data_zipx_lzma_alone(struct archive_read *a, const void **buff, 1648 size_t *size, int64_t *offset) 1649{ 1650 struct zip* zip = (struct zip *)(a->format->data); 1651 int ret; 1652 lzma_ret lz_ret; 1653 const void* compressed_buf; 1654 ssize_t bytes_avail, in_bytes, to_consume; 1655 1656 (void) offset; /* UNUSED */ 1657 1658 /* Initialize decompressor if not yet initialized. */ 1659 if (!zip->decompress_init) { 1660 ret = zipx_lzma_alone_init(a, zip); 1661 if (ret != ARCHIVE_OK) 1662 return (ret); 1663 } 1664 1665 /* Fetch more compressed data. The same note as in deflate handler applies 1666 * here as well: 1667 * 1668 * Note: '1' here is a performance optimization. Recall that the 1669 * decompression layer returns a count of available bytes; asking for more 1670 * than that forces the decompressor to combine reads by copying data. 1671 */ 1672 compressed_buf = __archive_read_ahead(a, 1, &bytes_avail); 1673 if (bytes_avail < 0) { 1674 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1675 "Truncated lzma file body"); 1676 return (ARCHIVE_FATAL); 1677 } 1678 1679 /* Set decompressor parameters. */ 1680 in_bytes = zipmin(zip->entry_bytes_remaining, bytes_avail); 1681 1682 zip->zipx_lzma_stream.next_in = compressed_buf; 1683 zip->zipx_lzma_stream.avail_in = in_bytes; 1684 zip->zipx_lzma_stream.total_in = 0; 1685 zip->zipx_lzma_stream.next_out = zip->uncompressed_buffer; 1686 zip->zipx_lzma_stream.avail_out = 1687 /* These lzma_alone streams lack end of stream marker, so let's make 1688 * sure the unpacker won't try to unpack more than it's supposed to. */ 1689 zipmin((int64_t) zip->uncompressed_buffer_size, 1690 zip->entry->uncompressed_size - 1691 zip->entry_uncompressed_bytes_read); 1692 zip->zipx_lzma_stream.total_out = 0; 1693 1694 /* Perform the decompression. */ 1695 lz_ret = lzma_code(&zip->zipx_lzma_stream, LZMA_RUN); 1696 switch(lz_ret) { 1697 case LZMA_DATA_ERROR: 1698 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1699 "lzma data error (error %d)", (int) lz_ret); 1700 return (ARCHIVE_FATAL); 1701 1702 case LZMA_OK: 1703 break; 1704 1705 default: 1706 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1707 "lzma unknown error %d", (int) lz_ret); 1708 return (ARCHIVE_FATAL); 1709 } 1710 1711 to_consume = zip->zipx_lzma_stream.total_in; 1712 1713 /* Update pointers. */ 1714 __archive_read_consume(a, to_consume); 1715 zip->entry_bytes_remaining -= to_consume; 1716 zip->entry_compressed_bytes_read += to_consume; 1717 zip->entry_uncompressed_bytes_read += zip->zipx_lzma_stream.total_out; 1718 1719 if(zip->entry_bytes_remaining == 0) { 1720 zip->end_of_entry = 1; 1721 } 1722 1723 /* Return values. */ 1724 *size = zip->zipx_lzma_stream.total_out; 1725 *buff = zip->uncompressed_buffer; 1726 1727 /* Behave the same way as during deflate decompression. */ 1728 ret = consume_optional_marker(a, zip); 1729 if (ret != ARCHIVE_OK) 1730 return (ret); 1731 1732 /* Free lzma decoder handle because we'll no longer need it. */ 1733 if(zip->end_of_entry) { 1734 lzma_end(&zip->zipx_lzma_stream); 1735 zip->zipx_lzma_valid = 0; 1736 } 1737 1738 /* If we're here, then we're good! */ 1739 return (ARCHIVE_OK); 1740} 1741#endif /* HAVE_LZMA_H && HAVE_LIBLZMA */ 1742 1743static int 1744zipx_ppmd8_init(struct archive_read *a, struct zip *zip) 1745{ 1746 const void* p; 1747 uint32_t val; 1748 uint32_t order; 1749 uint32_t mem; 1750 uint32_t restore_method; 1751 1752 /* Remove previous decompression context if it exists. */ 1753 if(zip->ppmd8_valid) { 1754 __archive_ppmd8_functions.Ppmd8_Free(&zip->ppmd8); 1755 zip->ppmd8_valid = 0; 1756 } 1757 1758 /* Create a new decompression context. */ 1759 __archive_ppmd8_functions.Ppmd8_Construct(&zip->ppmd8); 1760 zip->ppmd8_stream_failed = 0; 1761 1762 /* Setup function pointers required by Ppmd8 decompressor. The 1763 * 'ppmd_read' function will feed new bytes to the decompressor, 1764 * and will increment the 'zip->zipx_ppmd_read_compressed' counter. */ 1765 zip->ppmd8.Stream.In = &zip->zipx_ppmd_stream; 1766 zip->zipx_ppmd_stream.a = a; 1767 zip->zipx_ppmd_stream.Read = &ppmd_read; 1768 1769 /* Reset number of read bytes to 0. */ 1770 zip->zipx_ppmd_read_compressed = 0; 1771 1772 /* Read Ppmd8 header (2 bytes). */ 1773 p = __archive_read_ahead(a, 2, NULL); 1774 if(!p) { 1775 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1776 "Truncated file data in PPMd8 stream"); 1777 return (ARCHIVE_FATAL); 1778 } 1779 __archive_read_consume(a, 2); 1780 1781 /* Decode the stream's compression parameters. */ 1782 val = archive_le16dec(p); 1783 order = (val & 15) + 1; 1784 mem = ((val >> 4) & 0xff) + 1; 1785 restore_method = (val >> 12); 1786 1787 if(order < 2 || restore_method > 2) { 1788 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1789 "Invalid parameter set in PPMd8 stream (order=%d, " 1790 "restore=%d)", order, restore_method); 1791 return (ARCHIVE_FAILED); 1792 } 1793 1794 /* Allocate the memory needed to properly decompress the file. */ 1795 if(!__archive_ppmd8_functions.Ppmd8_Alloc(&zip->ppmd8, mem << 20)) { 1796 archive_set_error(&a->archive, ENOMEM, 1797 "Unable to allocate memory for PPMd8 stream: %d bytes", 1798 mem << 20); 1799 return (ARCHIVE_FATAL); 1800 } 1801 1802 /* Signal the cleanup function to release Ppmd8 context in the 1803 * cleanup phase. */ 1804 zip->ppmd8_valid = 1; 1805 1806 /* Perform further Ppmd8 initialization. */ 1807 if(!__archive_ppmd8_functions.Ppmd8_RangeDec_Init(&zip->ppmd8)) { 1808 archive_set_error(&a->archive, ARCHIVE_ERRNO_PROGRAMMER, 1809 "PPMd8 stream range decoder initialization error"); 1810 return (ARCHIVE_FATAL); 1811 } 1812 1813 __archive_ppmd8_functions.Ppmd8_Init(&zip->ppmd8, order, restore_method); 1814 1815 /* Allocate the buffer that will hold uncompressed data. */ 1816 free(zip->uncompressed_buffer); 1817 1818 zip->uncompressed_buffer_size = 256 * 1024; 1819 zip->uncompressed_buffer = 1820 (uint8_t*) malloc(zip->uncompressed_buffer_size); 1821 1822 if(zip->uncompressed_buffer == NULL) { 1823 archive_set_error(&a->archive, ENOMEM, 1824 "No memory for PPMd8 decompression"); 1825 return ARCHIVE_FATAL; 1826 } 1827 1828 /* Ppmd8 initialization is done. */ 1829 zip->decompress_init = 1; 1830 1831 /* We've already read 2 bytes in the output stream. Additionally, 1832 * Ppmd8 initialization code could read some data as well. So we 1833 * are advancing the stream by 2 bytes plus whatever number of 1834 * bytes Ppmd8 init function used. */ 1835 zip->entry_compressed_bytes_read += 2 + zip->zipx_ppmd_read_compressed; 1836 1837 return ARCHIVE_OK; 1838} 1839 1840static int 1841zip_read_data_zipx_ppmd(struct archive_read *a, const void **buff, 1842 size_t *size, int64_t *offset) 1843{ 1844 struct zip* zip = (struct zip *)(a->format->data); 1845 int ret; 1846 size_t consumed_bytes = 0; 1847 ssize_t bytes_avail = 0; 1848 1849 (void) offset; /* UNUSED */ 1850 1851 /* If we're here for the first time, initialize Ppmd8 decompression 1852 * context first. */ 1853 if(!zip->decompress_init) { 1854 ret = zipx_ppmd8_init(a, zip); 1855 if(ret != ARCHIVE_OK) 1856 return ret; 1857 } 1858 1859 /* Fetch for more data. We're reading 1 byte here, but libarchive should 1860 * prefetch more bytes. */ 1861 (void) __archive_read_ahead(a, 1, &bytes_avail); 1862 if(bytes_avail < 0) { 1863 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1864 "Truncated PPMd8 file body"); 1865 return (ARCHIVE_FATAL); 1866 } 1867 1868 /* This counter will be updated inside ppmd_read(), which at one 1869 * point will be called by Ppmd8_DecodeSymbol. */ 1870 zip->zipx_ppmd_read_compressed = 0; 1871 1872 /* Decompression loop. */ 1873 do { 1874 int sym = __archive_ppmd8_functions.Ppmd8_DecodeSymbol(&zip->ppmd8); 1875 if(sym < 0) { 1876 zip->end_of_entry = 1; 1877 break; 1878 } 1879 1880 /* This field is set by ppmd_read() when there was no more data 1881 * to be read. */ 1882 if(zip->ppmd8_stream_failed) { 1883 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1884 "Truncated PPMd8 file body"); 1885 return (ARCHIVE_FATAL); 1886 } 1887 1888 zip->uncompressed_buffer[consumed_bytes] = (uint8_t) sym; 1889 ++consumed_bytes; 1890 } while(consumed_bytes < zip->uncompressed_buffer_size); 1891 1892 /* Update pointers for libarchive. */ 1893 *buff = zip->uncompressed_buffer; 1894 *size = consumed_bytes; 1895 1896 /* Update pointers so we can continue decompression in another call. */ 1897 zip->entry_bytes_remaining -= zip->zipx_ppmd_read_compressed; 1898 zip->entry_compressed_bytes_read += zip->zipx_ppmd_read_compressed; 1899 zip->entry_uncompressed_bytes_read += consumed_bytes; 1900 1901 /* If we're at the end of stream, deinitialize Ppmd8 context. */ 1902 if(zip->end_of_entry) { 1903 __archive_ppmd8_functions.Ppmd8_Free(&zip->ppmd8); 1904 zip->ppmd8_valid = 0; 1905 } 1906 1907 /* Seek for optional marker, same way as in each zip entry. */ 1908 ret = consume_optional_marker(a, zip); 1909 if (ret != ARCHIVE_OK) 1910 return ret; 1911 1912 return ARCHIVE_OK; 1913} 1914 1915#ifdef HAVE_BZLIB_H 1916static int 1917zipx_bzip2_init(struct archive_read *a, struct zip *zip) 1918{ 1919 int r; 1920 1921 /* Deallocate already existing BZ2 decompression context if it 1922 * exists. */ 1923 if(zip->bzstream_valid) { 1924 BZ2_bzDecompressEnd(&zip->bzstream); 1925 zip->bzstream_valid = 0; 1926 } 1927 1928 /* Allocate a new BZ2 decompression context. */ 1929 memset(&zip->bzstream, 0, sizeof(bz_stream)); 1930 r = BZ2_bzDecompressInit(&zip->bzstream, 0, 1); 1931 if(r != BZ_OK) { 1932 archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC, 1933 "bzip2 initialization failed(%d)", 1934 r); 1935 1936 return ARCHIVE_FAILED; 1937 } 1938 1939 /* Mark the bzstream field to be released in cleanup phase. */ 1940 zip->bzstream_valid = 1; 1941 1942 /* (Re)allocate the buffer that will contain decompressed bytes. */ 1943 free(zip->uncompressed_buffer); 1944 1945 zip->uncompressed_buffer_size = 256 * 1024; 1946 zip->uncompressed_buffer = 1947 (uint8_t*) malloc(zip->uncompressed_buffer_size); 1948 if (zip->uncompressed_buffer == NULL) { 1949 archive_set_error(&a->archive, ENOMEM, 1950 "No memory for bzip2 decompression"); 1951 return ARCHIVE_FATAL; 1952 } 1953 1954 /* Initialization done. */ 1955 zip->decompress_init = 1; 1956 return ARCHIVE_OK; 1957} 1958 1959static int 1960zip_read_data_zipx_bzip2(struct archive_read *a, const void **buff, 1961 size_t *size, int64_t *offset) 1962{ 1963 struct zip *zip = (struct zip *)(a->format->data); 1964 ssize_t bytes_avail = 0, in_bytes, to_consume; 1965 const void *compressed_buff; 1966 int r; 1967 uint64_t total_out; 1968 1969 (void) offset; /* UNUSED */ 1970 1971 /* Initialize decompression context if we're here for the first time. */ 1972 if(!zip->decompress_init) { 1973 r = zipx_bzip2_init(a, zip); 1974 if(r != ARCHIVE_OK) 1975 return r; 1976 } 1977 1978 /* Fetch more compressed bytes. */ 1979 compressed_buff = __archive_read_ahead(a, 1, &bytes_avail); 1980 if(bytes_avail < 0) { 1981 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1982 "Truncated bzip2 file body"); 1983 return (ARCHIVE_FATAL); 1984 } 1985 1986 in_bytes = zipmin(zip->entry_bytes_remaining, bytes_avail); 1987 if(in_bytes < 1) { 1988 /* libbz2 doesn't complain when caller feeds avail_in == 0. It will 1989 * actually return success in this case, which is undesirable. This is 1990 * why we need to make this check manually. */ 1991 1992 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1993 "Truncated bzip2 file body"); 1994 return (ARCHIVE_FATAL); 1995 } 1996 1997 /* Setup buffer boundaries. */ 1998 zip->bzstream.next_in = (char*)(uintptr_t) compressed_buff; 1999 zip->bzstream.avail_in = in_bytes; 2000 zip->bzstream.total_in_hi32 = 0; 2001 zip->bzstream.total_in_lo32 = 0; 2002 zip->bzstream.next_out = (char*) zip->uncompressed_buffer; 2003 zip->bzstream.avail_out = zip->uncompressed_buffer_size; 2004 zip->bzstream.total_out_hi32 = 0; 2005 zip->bzstream.total_out_lo32 = 0; 2006 2007 /* Perform the decompression. */ 2008 r = BZ2_bzDecompress(&zip->bzstream); 2009 switch(r) { 2010 case BZ_STREAM_END: 2011 /* If we're at the end of the stream, deinitialize the 2012 * decompression context now. */ 2013 switch(BZ2_bzDecompressEnd(&zip->bzstream)) { 2014 case BZ_OK: 2015 break; 2016 default: 2017 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2018 "Failed to clean up bzip2 decompressor"); 2019 return ARCHIVE_FATAL; 2020 } 2021 2022 zip->end_of_entry = 1; 2023 break; 2024 case BZ_OK: 2025 /* The decompressor has successfully decoded this chunk of 2026 * data, but more data is still in queue. */ 2027 break; 2028 default: 2029 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2030 "bzip2 decompression failed"); 2031 return ARCHIVE_FATAL; 2032 } 2033 2034 /* Update the pointers so decompressor can continue decoding. */ 2035 to_consume = zip->bzstream.total_in_lo32; 2036 __archive_read_consume(a, to_consume); 2037 2038 total_out = ((uint64_t) zip->bzstream.total_out_hi32 << 32) + 2039 zip->bzstream.total_out_lo32; 2040 2041 zip->entry_bytes_remaining -= to_consume; 2042 zip->entry_compressed_bytes_read += to_consume; 2043 zip->entry_uncompressed_bytes_read += total_out; 2044 2045 /* Give libarchive its due. */ 2046 *size = total_out; 2047 *buff = zip->uncompressed_buffer; 2048 2049 /* Seek for optional marker, like in other entries. */ 2050 r = consume_optional_marker(a, zip); 2051 if(r != ARCHIVE_OK) 2052 return r; 2053 2054 return ARCHIVE_OK; 2055} 2056 2057#endif 2058 2059#ifdef HAVE_ZLIB_H 2060static int 2061zip_deflate_init(struct archive_read *a, struct zip *zip) 2062{ 2063 int r; 2064 2065 /* If we haven't yet read any data, initialize the decompressor. */ 2066 if (!zip->decompress_init) { 2067 if (zip->stream_valid) 2068 r = inflateReset(&zip->stream); 2069 else 2070 r = inflateInit2(&zip->stream, 2071 -15 /* Don't check for zlib header */); 2072 if (r != Z_OK) { 2073 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2074 "Can't initialize ZIP decompression."); 2075 return (ARCHIVE_FATAL); 2076 } 2077 /* Stream structure has been set up. */ 2078 zip->stream_valid = 1; 2079 /* We've initialized decompression for this stream. */ 2080 zip->decompress_init = 1; 2081 } 2082 return (ARCHIVE_OK); 2083} 2084 2085static int 2086zip_read_data_deflate(struct archive_read *a, const void **buff, 2087 size_t *size, int64_t *offset) 2088{ 2089 struct zip *zip; 2090 ssize_t bytes_avail; 2091 const void *compressed_buff, *sp; 2092 int r; 2093 2094 (void)offset; /* UNUSED */ 2095 2096 zip = (struct zip *)(a->format->data); 2097 2098 /* If the buffer hasn't been allocated, allocate it now. */ 2099 if (zip->uncompressed_buffer == NULL) { 2100 zip->uncompressed_buffer_size = 256 * 1024; 2101 zip->uncompressed_buffer 2102 = (unsigned char *)malloc(zip->uncompressed_buffer_size); 2103 if (zip->uncompressed_buffer == NULL) { 2104 archive_set_error(&a->archive, ENOMEM, 2105 "No memory for ZIP decompression"); 2106 return (ARCHIVE_FATAL); 2107 } 2108 } 2109 2110 r = zip_deflate_init(a, zip); 2111 if (r != ARCHIVE_OK) 2112 return (r); 2113 2114 /* 2115 * Note: '1' here is a performance optimization. 2116 * Recall that the decompression layer returns a count of 2117 * available bytes; asking for more than that forces the 2118 * decompressor to combine reads by copying data. 2119 */ 2120 compressed_buff = sp = __archive_read_ahead(a, 1, &bytes_avail); 2121 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) 2122 && bytes_avail > zip->entry_bytes_remaining) { 2123 bytes_avail = (ssize_t)zip->entry_bytes_remaining; 2124 } 2125 if (bytes_avail < 0) { 2126 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2127 "Truncated ZIP file body"); 2128 return (ARCHIVE_FATAL); 2129 } 2130 2131 if (zip->tctx_valid || zip->cctx_valid) { 2132 if (zip->decrypted_bytes_remaining < (size_t)bytes_avail) { 2133 size_t buff_remaining = 2134 (zip->decrypted_buffer + zip->decrypted_buffer_size) 2135 - (zip->decrypted_ptr + zip->decrypted_bytes_remaining); 2136 2137 if (buff_remaining > (size_t)bytes_avail) 2138 buff_remaining = (size_t)bytes_avail; 2139 2140 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) && 2141 zip->entry_bytes_remaining > 0) { 2142 if ((int64_t)(zip->decrypted_bytes_remaining 2143 + buff_remaining) 2144 > zip->entry_bytes_remaining) { 2145 if (zip->entry_bytes_remaining < 2146 (int64_t)zip->decrypted_bytes_remaining) 2147 buff_remaining = 0; 2148 else 2149 buff_remaining = 2150 (size_t)zip->entry_bytes_remaining 2151 - zip->decrypted_bytes_remaining; 2152 } 2153 } 2154 if (buff_remaining > 0) { 2155 if (zip->tctx_valid) { 2156 trad_enc_decrypt_update(&zip->tctx, 2157 compressed_buff, buff_remaining, 2158 zip->decrypted_ptr 2159 + zip->decrypted_bytes_remaining, 2160 buff_remaining); 2161 } else { 2162 size_t dsize = buff_remaining; 2163 archive_decrypto_aes_ctr_update( 2164 &zip->cctx, 2165 compressed_buff, buff_remaining, 2166 zip->decrypted_ptr 2167 + zip->decrypted_bytes_remaining, 2168 &dsize); 2169 } 2170 zip->decrypted_bytes_remaining += buff_remaining; 2171 } 2172 } 2173 bytes_avail = zip->decrypted_bytes_remaining; 2174 compressed_buff = (const char *)zip->decrypted_ptr; 2175 } 2176 2177 /* 2178 * A bug in zlib.h: stream.next_in should be marked 'const' 2179 * but isn't (the library never alters data through the 2180 * next_in pointer, only reads it). The result: this ugly 2181 * cast to remove 'const'. 2182 */ 2183 zip->stream.next_in = (Bytef *)(uintptr_t)(const void *)compressed_buff; 2184 zip->stream.avail_in = (uInt)bytes_avail; 2185 zip->stream.total_in = 0; 2186 zip->stream.next_out = zip->uncompressed_buffer; 2187 zip->stream.avail_out = (uInt)zip->uncompressed_buffer_size; 2188 zip->stream.total_out = 0; 2189 2190 r = inflate(&zip->stream, 0); 2191 switch (r) { 2192 case Z_OK: 2193 break; 2194 case Z_STREAM_END: 2195 zip->end_of_entry = 1; 2196 break; 2197 case Z_MEM_ERROR: 2198 archive_set_error(&a->archive, ENOMEM, 2199 "Out of memory for ZIP decompression"); 2200 return (ARCHIVE_FATAL); 2201 default: 2202 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2203 "ZIP decompression failed (%d)", r); 2204 return (ARCHIVE_FATAL); 2205 } 2206 2207 /* Consume as much as the compressor actually used. */ 2208 bytes_avail = zip->stream.total_in; 2209 if (zip->tctx_valid || zip->cctx_valid) { 2210 zip->decrypted_bytes_remaining -= bytes_avail; 2211 if (zip->decrypted_bytes_remaining == 0) 2212 zip->decrypted_ptr = zip->decrypted_buffer; 2213 else 2214 zip->decrypted_ptr += bytes_avail; 2215 } 2216 /* Calculate compressed data as much as we used.*/ 2217 if (zip->hctx_valid) 2218 archive_hmac_sha1_update(&zip->hctx, sp, bytes_avail); 2219 __archive_read_consume(a, bytes_avail); 2220 zip->entry_bytes_remaining -= bytes_avail; 2221 zip->entry_compressed_bytes_read += bytes_avail; 2222 2223 *size = zip->stream.total_out; 2224 zip->entry_uncompressed_bytes_read += zip->stream.total_out; 2225 *buff = zip->uncompressed_buffer; 2226 2227 if (zip->end_of_entry && zip->hctx_valid) { 2228 r = check_authentication_code(a, NULL); 2229 if (r != ARCHIVE_OK) 2230 return (r); 2231 } 2232 2233 r = consume_optional_marker(a, zip); 2234 if (r != ARCHIVE_OK) 2235 return (r); 2236 2237 return (ARCHIVE_OK); 2238} 2239#endif 2240 2241static int 2242read_decryption_header(struct archive_read *a) 2243{ 2244 struct zip *zip = (struct zip *)(a->format->data); 2245 const char *p; 2246 unsigned int remaining_size; 2247 unsigned int ts; 2248 2249 /* 2250 * Read an initialization vector data field. 2251 */ 2252 p = __archive_read_ahead(a, 2, NULL); 2253 if (p == NULL) 2254 goto truncated; 2255 ts = zip->iv_size; 2256 zip->iv_size = archive_le16dec(p); 2257 __archive_read_consume(a, 2); 2258 if (ts < zip->iv_size) { 2259 free(zip->iv); 2260 zip->iv = NULL; 2261 } 2262 p = __archive_read_ahead(a, zip->iv_size, NULL); 2263 if (p == NULL) 2264 goto truncated; 2265 if (zip->iv == NULL) { 2266 zip->iv = malloc(zip->iv_size); 2267 if (zip->iv == NULL) 2268 goto nomem; 2269 } 2270 memcpy(zip->iv, p, zip->iv_size); 2271 __archive_read_consume(a, zip->iv_size); 2272 2273 /* 2274 * Read a size of remaining decryption header field. 2275 */ 2276 p = __archive_read_ahead(a, 14, NULL); 2277 if (p == NULL) 2278 goto truncated; 2279 remaining_size = archive_le32dec(p); 2280 if (remaining_size < 16 || remaining_size > (1 << 18)) 2281 goto corrupted; 2282 2283 /* Check if format version is supported. */ 2284 if (archive_le16dec(p+4) != 3) { 2285 archive_set_error(&a->archive, 2286 ARCHIVE_ERRNO_FILE_FORMAT, 2287 "Unsupported encryption format version: %u", 2288 archive_le16dec(p+4)); 2289 return (ARCHIVE_FAILED); 2290 } 2291 2292 /* 2293 * Read an encryption algorithm field. 2294 */ 2295 zip->alg_id = archive_le16dec(p+6); 2296 switch (zip->alg_id) { 2297 case 0x6601:/* DES */ 2298 case 0x6602:/* RC2 */ 2299 case 0x6603:/* 3DES 168 */ 2300 case 0x6609:/* 3DES 112 */ 2301 case 0x660E:/* AES 128 */ 2302 case 0x660F:/* AES 192 */ 2303 case 0x6610:/* AES 256 */ 2304 case 0x6702:/* RC2 (version >= 5.2) */ 2305 case 0x6720:/* Blowfish */ 2306 case 0x6721:/* Twofish */ 2307 case 0x6801:/* RC4 */ 2308 /* Supported encryption algorithm. */ 2309 break; 2310 default: 2311 archive_set_error(&a->archive, 2312 ARCHIVE_ERRNO_FILE_FORMAT, 2313 "Unknown encryption algorithm: %u", zip->alg_id); 2314 return (ARCHIVE_FAILED); 2315 } 2316 2317 /* 2318 * Read a bit length field. 2319 */ 2320 zip->bit_len = archive_le16dec(p+8); 2321 2322 /* 2323 * Read a flags field. 2324 */ 2325 zip->flags = archive_le16dec(p+10); 2326 switch (zip->flags & 0xf000) { 2327 case 0x0001: /* Password is required to decrypt. */ 2328 case 0x0002: /* Certificates only. */ 2329 case 0x0003: /* Password or certificate required to decrypt. */ 2330 break; 2331 default: 2332 archive_set_error(&a->archive, 2333 ARCHIVE_ERRNO_FILE_FORMAT, 2334 "Unknown encryption flag: %u", zip->flags); 2335 return (ARCHIVE_FAILED); 2336 } 2337 if ((zip->flags & 0xf000) == 0 || 2338 (zip->flags & 0xf000) == 0x4000) { 2339 archive_set_error(&a->archive, 2340 ARCHIVE_ERRNO_FILE_FORMAT, 2341 "Unknown encryption flag: %u", zip->flags); 2342 return (ARCHIVE_FAILED); 2343 } 2344 2345 /* 2346 * Read an encrypted random data field. 2347 */ 2348 ts = zip->erd_size; 2349 zip->erd_size = archive_le16dec(p+12); 2350 __archive_read_consume(a, 14); 2351 if ((zip->erd_size & 0xf) != 0 || 2352 (zip->erd_size + 16) > remaining_size || 2353 (zip->erd_size + 16) < zip->erd_size) 2354 goto corrupted; 2355 2356 if (ts < zip->erd_size) { 2357 free(zip->erd); 2358 zip->erd = NULL; 2359 } 2360 p = __archive_read_ahead(a, zip->erd_size, NULL); 2361 if (p == NULL) 2362 goto truncated; 2363 if (zip->erd == NULL) { 2364 zip->erd = malloc(zip->erd_size); 2365 if (zip->erd == NULL) 2366 goto nomem; 2367 } 2368 memcpy(zip->erd, p, zip->erd_size); 2369 __archive_read_consume(a, zip->erd_size); 2370 2371 /* 2372 * Read a reserved data field. 2373 */ 2374 p = __archive_read_ahead(a, 4, NULL); 2375 if (p == NULL) 2376 goto truncated; 2377 /* Reserved data size should be zero. */ 2378 if (archive_le32dec(p) != 0) 2379 goto corrupted; 2380 __archive_read_consume(a, 4); 2381 2382 /* 2383 * Read a password validation data field. 2384 */ 2385 p = __archive_read_ahead(a, 2, NULL); 2386 if (p == NULL) 2387 goto truncated; 2388 ts = zip->v_size; 2389 zip->v_size = archive_le16dec(p); 2390 __archive_read_consume(a, 2); 2391 if ((zip->v_size & 0x0f) != 0 || 2392 (zip->erd_size + zip->v_size + 16) > remaining_size || 2393 (zip->erd_size + zip->v_size + 16) < (zip->erd_size + zip->v_size)) 2394 goto corrupted; 2395 if (ts < zip->v_size) { 2396 free(zip->v_data); 2397 zip->v_data = NULL; 2398 } 2399 p = __archive_read_ahead(a, zip->v_size, NULL); 2400 if (p == NULL) 2401 goto truncated; 2402 if (zip->v_data == NULL) { 2403 zip->v_data = malloc(zip->v_size); 2404 if (zip->v_data == NULL) 2405 goto nomem; 2406 } 2407 memcpy(zip->v_data, p, zip->v_size); 2408 __archive_read_consume(a, zip->v_size); 2409 2410 p = __archive_read_ahead(a, 4, NULL); 2411 if (p == NULL) 2412 goto truncated; 2413 zip->v_crc32 = archive_le32dec(p); 2414 __archive_read_consume(a, 4); 2415 2416 /*return (ARCHIVE_OK); 2417 * This is not fully implemented yet.*/ 2418 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2419 "Encrypted file is unsupported"); 2420 return (ARCHIVE_FAILED); 2421truncated: 2422 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2423 "Truncated ZIP file data"); 2424 return (ARCHIVE_FATAL); 2425corrupted: 2426 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2427 "Corrupted ZIP file data"); 2428 return (ARCHIVE_FATAL); 2429nomem: 2430 archive_set_error(&a->archive, ENOMEM, 2431 "No memory for ZIP decryption"); 2432 return (ARCHIVE_FATAL); 2433} 2434 2435static int 2436zip_alloc_decryption_buffer(struct archive_read *a) 2437{ 2438 struct zip *zip = (struct zip *)(a->format->data); 2439 size_t bs = 256 * 1024; 2440 2441 if (zip->decrypted_buffer == NULL) { 2442 zip->decrypted_buffer_size = bs; 2443 zip->decrypted_buffer = malloc(bs); 2444 if (zip->decrypted_buffer == NULL) { 2445 archive_set_error(&a->archive, ENOMEM, 2446 "No memory for ZIP decryption"); 2447 return (ARCHIVE_FATAL); 2448 } 2449 } 2450 zip->decrypted_ptr = zip->decrypted_buffer; 2451 return (ARCHIVE_OK); 2452} 2453 2454static int 2455init_traditional_PKWARE_decryption(struct archive_read *a) 2456{ 2457 struct zip *zip = (struct zip *)(a->format->data); 2458 const void *p; 2459 int retry; 2460 int r; 2461 2462 if (zip->tctx_valid) 2463 return (ARCHIVE_OK); 2464 2465 /* 2466 Read the 12 bytes encryption header stored at 2467 the start of the data area. 2468 */ 2469#define ENC_HEADER_SIZE 12 2470 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) 2471 && zip->entry_bytes_remaining < ENC_HEADER_SIZE) { 2472 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2473 "Truncated Zip encrypted body: only %jd bytes available", 2474 (intmax_t)zip->entry_bytes_remaining); 2475 return (ARCHIVE_FATAL); 2476 } 2477 2478 p = __archive_read_ahead(a, ENC_HEADER_SIZE, NULL); 2479 if (p == NULL) { 2480 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2481 "Truncated ZIP file data"); 2482 return (ARCHIVE_FATAL); 2483 } 2484 2485 for (retry = 0;; retry++) { 2486 const char *passphrase; 2487 uint8_t crcchk; 2488 2489 passphrase = __archive_read_next_passphrase(a); 2490 if (passphrase == NULL) { 2491 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2492 (retry > 0)? 2493 "Incorrect passphrase": 2494 "Passphrase required for this entry"); 2495 return (ARCHIVE_FAILED); 2496 } 2497 2498 /* 2499 * Initialize ctx for Traditional PKWARE Decryption. 2500 */ 2501 r = trad_enc_init(&zip->tctx, passphrase, strlen(passphrase), 2502 p, ENC_HEADER_SIZE, &crcchk); 2503 if (r == 0 && crcchk == zip->entry->decdat) 2504 break;/* The passphrase is OK. */ 2505 if (retry > 10000) { 2506 /* Avoid infinity loop. */ 2507 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2508 "Too many incorrect passphrases"); 2509 return (ARCHIVE_FAILED); 2510 } 2511 } 2512 2513 __archive_read_consume(a, ENC_HEADER_SIZE); 2514 zip->tctx_valid = 1; 2515 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)) { 2516 zip->entry_bytes_remaining -= ENC_HEADER_SIZE; 2517 } 2518 /*zip->entry_uncompressed_bytes_read += ENC_HEADER_SIZE;*/ 2519 zip->entry_compressed_bytes_read += ENC_HEADER_SIZE; 2520 zip->decrypted_bytes_remaining = 0; 2521 2522 return (zip_alloc_decryption_buffer(a)); 2523#undef ENC_HEADER_SIZE 2524} 2525 2526static int 2527init_WinZip_AES_decryption(struct archive_read *a) 2528{ 2529 struct zip *zip = (struct zip *)(a->format->data); 2530 const void *p; 2531 const uint8_t *pv; 2532 size_t key_len, salt_len; 2533 uint8_t derived_key[MAX_DERIVED_KEY_BUF_SIZE]; 2534 int retry; 2535 int r; 2536 2537 if (zip->cctx_valid || zip->hctx_valid) 2538 return (ARCHIVE_OK); 2539 2540 switch (zip->entry->aes_extra.strength) { 2541 case 1: salt_len = 8; key_len = 16; break; 2542 case 2: salt_len = 12; key_len = 24; break; 2543 case 3: salt_len = 16; key_len = 32; break; 2544 default: goto corrupted; 2545 } 2546 p = __archive_read_ahead(a, salt_len + 2, NULL); 2547 if (p == NULL) 2548 goto truncated; 2549 2550 for (retry = 0;; retry++) { 2551 const char *passphrase; 2552 2553 passphrase = __archive_read_next_passphrase(a); 2554 if (passphrase == NULL) { 2555 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2556 (retry > 0)? 2557 "Incorrect passphrase": 2558 "Passphrase required for this entry"); 2559 return (ARCHIVE_FAILED); 2560 } 2561 memset(derived_key, 0, sizeof(derived_key)); 2562 r = archive_pbkdf2_sha1(passphrase, strlen(passphrase), 2563 p, salt_len, 1000, derived_key, key_len * 2 + 2); 2564 if (r != 0) { 2565 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2566 "Decryption is unsupported due to lack of " 2567 "crypto library"); 2568 return (ARCHIVE_FAILED); 2569 } 2570 2571 /* Check password verification value. */ 2572 pv = ((const uint8_t *)p) + salt_len; 2573 if (derived_key[key_len * 2] == pv[0] && 2574 derived_key[key_len * 2 + 1] == pv[1]) 2575 break;/* The passphrase is OK. */ 2576 if (retry > 10000) { 2577 /* Avoid infinity loop. */ 2578 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2579 "Too many incorrect passphrases"); 2580 return (ARCHIVE_FAILED); 2581 } 2582 } 2583 2584 r = archive_decrypto_aes_ctr_init(&zip->cctx, derived_key, key_len); 2585 if (r != 0) { 2586 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2587 "Decryption is unsupported due to lack of crypto library"); 2588 return (ARCHIVE_FAILED); 2589 } 2590 r = archive_hmac_sha1_init(&zip->hctx, derived_key + key_len, key_len); 2591 if (r != 0) { 2592 archive_decrypto_aes_ctr_release(&zip->cctx); 2593 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2594 "Failed to initialize HMAC-SHA1"); 2595 return (ARCHIVE_FAILED); 2596 } 2597 zip->cctx_valid = zip->hctx_valid = 1; 2598 __archive_read_consume(a, salt_len + 2); 2599 zip->entry_bytes_remaining -= salt_len + 2 + AUTH_CODE_SIZE; 2600 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) 2601 && zip->entry_bytes_remaining < 0) 2602 goto corrupted; 2603 zip->entry_compressed_bytes_read += salt_len + 2 + AUTH_CODE_SIZE; 2604 zip->decrypted_bytes_remaining = 0; 2605 2606 zip->entry->compression = zip->entry->aes_extra.compression; 2607 return (zip_alloc_decryption_buffer(a)); 2608 2609truncated: 2610 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2611 "Truncated ZIP file data"); 2612 return (ARCHIVE_FATAL); 2613corrupted: 2614 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2615 "Corrupted ZIP file data"); 2616 return (ARCHIVE_FATAL); 2617} 2618 2619static int 2620archive_read_format_zip_read_data(struct archive_read *a, 2621 const void **buff, size_t *size, int64_t *offset) 2622{ 2623 int r; 2624 struct zip *zip = (struct zip *)(a->format->data); 2625 2626 if (zip->has_encrypted_entries == 2627 ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) { 2628 zip->has_encrypted_entries = 0; 2629 } 2630 2631 *offset = zip->entry_uncompressed_bytes_read; 2632 *size = 0; 2633 *buff = NULL; 2634 2635 /* If we hit end-of-entry last time, return ARCHIVE_EOF. */ 2636 if (zip->end_of_entry) 2637 return (ARCHIVE_EOF); 2638 2639 /* Return EOF immediately if this is a non-regular file. */ 2640 if (AE_IFREG != (zip->entry->mode & AE_IFMT)) 2641 return (ARCHIVE_EOF); 2642 2643 __archive_read_consume(a, zip->unconsumed); 2644 zip->unconsumed = 0; 2645 2646 if (zip->init_decryption) { 2647 zip->has_encrypted_entries = 1; 2648 if (zip->entry->zip_flags & ZIP_STRONG_ENCRYPTED) 2649 r = read_decryption_header(a); 2650 else if (zip->entry->compression == WINZIP_AES_ENCRYPTION) 2651 r = init_WinZip_AES_decryption(a); 2652 else 2653 r = init_traditional_PKWARE_decryption(a); 2654 if (r != ARCHIVE_OK) 2655 return (r); 2656 zip->init_decryption = 0; 2657 } 2658 2659 switch(zip->entry->compression) { 2660 case 0: /* No compression. */ 2661 r = zip_read_data_none(a, buff, size, offset); 2662 break; 2663#ifdef HAVE_BZLIB_H 2664 case 12: /* ZIPx bzip2 compression. */ 2665 r = zip_read_data_zipx_bzip2(a, buff, size, offset); 2666 break; 2667#endif 2668#if HAVE_LZMA_H && HAVE_LIBLZMA 2669 case 14: /* ZIPx LZMA compression. */ 2670 r = zip_read_data_zipx_lzma_alone(a, buff, size, offset); 2671 break; 2672 case 95: /* ZIPx XZ compression. */ 2673 r = zip_read_data_zipx_xz(a, buff, size, offset); 2674 break; 2675#endif 2676 /* PPMd support is built-in, so we don't need any #if guards. */ 2677 case 98: /* ZIPx PPMd compression. */ 2678 r = zip_read_data_zipx_ppmd(a, buff, size, offset); 2679 break; 2680 2681#ifdef HAVE_ZLIB_H 2682 case 8: /* Deflate compression. */ 2683 r = zip_read_data_deflate(a, buff, size, offset); 2684 break; 2685#endif 2686 default: /* Unsupported compression. */ 2687 /* Return a warning. */ 2688 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2689 "Unsupported ZIP compression method (%d: %s)", 2690 zip->entry->compression, compression_name(zip->entry->compression)); 2691 /* We can't decompress this entry, but we will 2692 * be able to skip() it and try the next entry. */ 2693 return (ARCHIVE_FAILED); 2694 break; 2695 } 2696 if (r != ARCHIVE_OK) 2697 return (r); 2698 /* Update checksum */ 2699 if (*size) 2700 zip->entry_crc32 = zip->crc32func(zip->entry_crc32, *buff, 2701 (unsigned)*size); 2702 /* If we hit the end, swallow any end-of-data marker. */ 2703 if (zip->end_of_entry) { 2704 /* Check file size, CRC against these values. */ 2705 if (zip->entry->compressed_size != 2706 zip->entry_compressed_bytes_read) { 2707 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2708 "ZIP compressed data is wrong size " 2709 "(read %jd, expected %jd)", 2710 (intmax_t)zip->entry_compressed_bytes_read, 2711 (intmax_t)zip->entry->compressed_size); 2712 return (ARCHIVE_WARN); 2713 } 2714 /* Size field only stores the lower 32 bits of the actual 2715 * size. */ 2716 if ((zip->entry->uncompressed_size & UINT32_MAX) 2717 != (zip->entry_uncompressed_bytes_read & UINT32_MAX)) { 2718 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2719 "ZIP uncompressed data is wrong size " 2720 "(read %jd, expected %jd)\n", 2721 (intmax_t)zip->entry_uncompressed_bytes_read, 2722 (intmax_t)zip->entry->uncompressed_size); 2723 return (ARCHIVE_WARN); 2724 } 2725 /* Check computed CRC against header */ 2726 if ((!zip->hctx_valid || 2727 zip->entry->aes_extra.vendor != AES_VENDOR_AE_2) && 2728 zip->entry->crc32 != zip->entry_crc32 2729 && !zip->ignore_crc32) { 2730 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2731 "ZIP bad CRC: 0x%lx should be 0x%lx", 2732 (unsigned long)zip->entry_crc32, 2733 (unsigned long)zip->entry->crc32); 2734 return (ARCHIVE_WARN); 2735 } 2736 } 2737 2738 return (ARCHIVE_OK); 2739} 2740 2741static int 2742archive_read_format_zip_cleanup(struct archive_read *a) 2743{ 2744 struct zip *zip; 2745 struct zip_entry *zip_entry, *next_zip_entry; 2746 2747 zip = (struct zip *)(a->format->data); 2748 2749#ifdef HAVE_ZLIB_H 2750 if (zip->stream_valid) 2751 inflateEnd(&zip->stream); 2752#endif 2753 2754#if HAVA_LZMA_H && HAVE_LIBLZMA 2755 if (zip->zipx_lzma_valid) { 2756 lzma_end(&zip->zipx_lzma_stream); 2757 } 2758#endif 2759 2760#ifdef HAVE_BZLIB_H 2761 if (zip->bzstream_valid) { 2762 BZ2_bzDecompressEnd(&zip->bzstream); 2763 } 2764#endif 2765 2766 free(zip->uncompressed_buffer); 2767 2768 if (zip->ppmd8_valid) 2769 __archive_ppmd8_functions.Ppmd8_Free(&zip->ppmd8); 2770 2771 if (zip->zip_entries) { 2772 zip_entry = zip->zip_entries; 2773 while (zip_entry != NULL) { 2774 next_zip_entry = zip_entry->next; 2775 archive_string_free(&zip_entry->rsrcname); 2776 free(zip_entry); 2777 zip_entry = next_zip_entry; 2778 } 2779 } 2780 free(zip->decrypted_buffer); 2781 if (zip->cctx_valid) 2782 archive_decrypto_aes_ctr_release(&zip->cctx); 2783 if (zip->hctx_valid) 2784 archive_hmac_sha1_cleanup(&zip->hctx); 2785 free(zip->iv); 2786 free(zip->erd); 2787 free(zip->v_data); 2788 archive_string_free(&zip->format_name); 2789 free(zip); 2790 (a->format->data) = NULL; 2791 return (ARCHIVE_OK); 2792} 2793 2794static int 2795archive_read_format_zip_has_encrypted_entries(struct archive_read *_a) 2796{ 2797 if (_a && _a->format) { 2798 struct zip * zip = (struct zip *)_a->format->data; 2799 if (zip) { 2800 return zip->has_encrypted_entries; 2801 } 2802 } 2803 return ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW; 2804} 2805 2806static int 2807archive_read_format_zip_options(struct archive_read *a, 2808 const char *key, const char *val) 2809{ 2810 struct zip *zip; 2811 int ret = ARCHIVE_FAILED; 2812 2813 zip = (struct zip *)(a->format->data); 2814 if (strcmp(key, "compat-2x") == 0) { 2815 /* Handle filenames as libarchive 2.x */ 2816 zip->init_default_conversion = (val != NULL) ? 1 : 0; 2817 return (ARCHIVE_OK); 2818 } else if (strcmp(key, "hdrcharset") == 0) { 2819 if (val == NULL || val[0] == 0) 2820 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2821 "zip: hdrcharset option needs a character-set name" 2822 ); 2823 else { 2824 zip->sconv = archive_string_conversion_from_charset( 2825 &a->archive, val, 0); 2826 if (zip->sconv != NULL) { 2827 if (strcmp(val, "UTF-8") == 0) 2828 zip->sconv_utf8 = zip->sconv; 2829 ret = ARCHIVE_OK; 2830 } else 2831 ret = ARCHIVE_FATAL; 2832 } 2833 return (ret); 2834 } else if (strcmp(key, "ignorecrc32") == 0) { 2835 /* Mostly useful for testing. */ 2836 if (val == NULL || val[0] == 0) { 2837 zip->crc32func = real_crc32; 2838 zip->ignore_crc32 = 0; 2839 } else { 2840 zip->crc32func = fake_crc32; 2841 zip->ignore_crc32 = 1; 2842 } 2843 return (ARCHIVE_OK); 2844 } else if (strcmp(key, "mac-ext") == 0) { 2845 zip->process_mac_extensions = (val != NULL && val[0] != 0); 2846 return (ARCHIVE_OK); 2847 } 2848 2849 /* Note: The "warn" return is just to inform the options 2850 * supervisor that we didn't handle it. It will generate 2851 * a suitable error if no one used this option. */ 2852 return (ARCHIVE_WARN); 2853} 2854 2855int 2856archive_read_support_format_zip(struct archive *a) 2857{ 2858 int r; 2859 r = archive_read_support_format_zip_streamable(a); 2860 if (r != ARCHIVE_OK) 2861 return r; 2862 return (archive_read_support_format_zip_seekable(a)); 2863} 2864 2865/* ------------------------------------------------------------------------ */ 2866 2867/* 2868 * Streaming-mode support 2869 */ 2870 2871 2872static int 2873archive_read_support_format_zip_capabilities_streamable(struct archive_read * a) 2874{ 2875 (void)a; /* UNUSED */ 2876 return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA | 2877 ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA); 2878} 2879 2880static int 2881archive_read_format_zip_streamable_bid(struct archive_read *a, int best_bid) 2882{ 2883 const char *p; 2884 2885 (void)best_bid; /* UNUSED */ 2886 2887 if ((p = __archive_read_ahead(a, 4, NULL)) == NULL) 2888 return (-1); 2889 2890 /* 2891 * Bid of 29 here comes from: 2892 * + 16 bits for "PK", 2893 * + next 16-bit field has 6 options so contributes 2894 * about 16 - log_2(6) ~= 16 - 2.6 ~= 13 bits 2895 * 2896 * So we've effectively verified ~29 total bits of check data. 2897 */ 2898 if (p[0] == 'P' && p[1] == 'K') { 2899 if ((p[2] == '\001' && p[3] == '\002') 2900 || (p[2] == '\003' && p[3] == '\004') 2901 || (p[2] == '\005' && p[3] == '\006') 2902 || (p[2] == '\006' && p[3] == '\006') 2903 || (p[2] == '\007' && p[3] == '\010') 2904 || (p[2] == '0' && p[3] == '0')) 2905 return (29); 2906 } 2907 2908 /* TODO: It's worth looking ahead a little bit for a valid 2909 * PK signature. In particular, that would make it possible 2910 * to read some UUEncoded SFX files or SFX files coming from 2911 * a network socket. */ 2912 2913 return (0); 2914} 2915 2916static int 2917archive_read_format_zip_streamable_read_header(struct archive_read *a, 2918 struct archive_entry *entry) 2919{ 2920 struct zip *zip; 2921 2922 a->archive.archive_format = ARCHIVE_FORMAT_ZIP; 2923 if (a->archive.archive_format_name == NULL) 2924 a->archive.archive_format_name = "ZIP"; 2925 2926 zip = (struct zip *)(a->format->data); 2927 2928 /* 2929 * It should be sufficient to call archive_read_next_header() for 2930 * a reader to determine if an entry is encrypted or not. If the 2931 * encryption of an entry is only detectable when calling 2932 * archive_read_data(), so be it. We'll do the same check there 2933 * as well. 2934 */ 2935 if (zip->has_encrypted_entries == 2936 ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) 2937 zip->has_encrypted_entries = 0; 2938 2939 /* Make sure we have a zip_entry structure to use. */ 2940 if (zip->zip_entries == NULL) { 2941 zip->zip_entries = malloc(sizeof(struct zip_entry)); 2942 if (zip->zip_entries == NULL) { 2943 archive_set_error(&a->archive, ENOMEM, 2944 "Out of memory"); 2945 return ARCHIVE_FATAL; 2946 } 2947 } 2948 zip->entry = zip->zip_entries; 2949 memset(zip->entry, 0, sizeof(struct zip_entry)); 2950 2951 if (zip->cctx_valid) 2952 archive_decrypto_aes_ctr_release(&zip->cctx); 2953 if (zip->hctx_valid) 2954 archive_hmac_sha1_cleanup(&zip->hctx); 2955 zip->tctx_valid = zip->cctx_valid = zip->hctx_valid = 0; 2956 __archive_read_reset_passphrase(a); 2957 2958 /* Search ahead for the next local file header. */ 2959 __archive_read_consume(a, zip->unconsumed); 2960 zip->unconsumed = 0; 2961 for (;;) { 2962 int64_t skipped = 0; 2963 const char *p, *end; 2964 ssize_t bytes; 2965 2966 p = __archive_read_ahead(a, 4, &bytes); 2967 if (p == NULL) 2968 return (ARCHIVE_FATAL); 2969 end = p + bytes; 2970 2971 while (p + 4 <= end) { 2972 if (p[0] == 'P' && p[1] == 'K') { 2973 if (p[2] == '\003' && p[3] == '\004') { 2974 /* Regular file entry. */ 2975 __archive_read_consume(a, skipped); 2976 return zip_read_local_file_header(a, 2977 entry, zip); 2978 } 2979 2980 /* 2981 * TODO: We cannot restore permissions 2982 * based only on the local file headers. 2983 * Consider scanning the central 2984 * directory and returning additional 2985 * entries for at least directories. 2986 * This would allow us to properly set 2987 * directory permissions. 2988 * 2989 * This won't help us fix symlinks 2990 * and may not help with regular file 2991 * permissions, either. <sigh> 2992 */ 2993 if (p[2] == '\001' && p[3] == '\002') { 2994 return (ARCHIVE_EOF); 2995 } 2996 2997 /* End of central directory? Must be an 2998 * empty archive. */ 2999 if ((p[2] == '\005' && p[3] == '\006') 3000 || (p[2] == '\006' && p[3] == '\006')) 3001 return (ARCHIVE_EOF); 3002 } 3003 ++p; 3004 ++skipped; 3005 } 3006 __archive_read_consume(a, skipped); 3007 } 3008} 3009 3010static int 3011archive_read_format_zip_read_data_skip_streamable(struct archive_read *a) 3012{ 3013 struct zip *zip; 3014 int64_t bytes_skipped; 3015 3016 zip = (struct zip *)(a->format->data); 3017 bytes_skipped = __archive_read_consume(a, zip->unconsumed); 3018 zip->unconsumed = 0; 3019 if (bytes_skipped < 0) 3020 return (ARCHIVE_FATAL); 3021 3022 /* If we've already read to end of data, we're done. */ 3023 if (zip->end_of_entry) 3024 return (ARCHIVE_OK); 3025 3026 /* So we know we're streaming... */ 3027 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) 3028 || zip->entry->compressed_size > 0) { 3029 /* We know the compressed length, so we can just skip. */ 3030 bytes_skipped = __archive_read_consume(a, 3031 zip->entry_bytes_remaining); 3032 if (bytes_skipped < 0) 3033 return (ARCHIVE_FATAL); 3034 return (ARCHIVE_OK); 3035 } 3036 3037 if (zip->init_decryption) { 3038 int r; 3039 3040 zip->has_encrypted_entries = 1; 3041 if (zip->entry->zip_flags & ZIP_STRONG_ENCRYPTED) 3042 r = read_decryption_header(a); 3043 else if (zip->entry->compression == WINZIP_AES_ENCRYPTION) 3044 r = init_WinZip_AES_decryption(a); 3045 else 3046 r = init_traditional_PKWARE_decryption(a); 3047 if (r != ARCHIVE_OK) 3048 return (r); 3049 zip->init_decryption = 0; 3050 } 3051 3052 /* We're streaming and we don't know the length. */ 3053 /* If the body is compressed and we know the format, we can 3054 * find an exact end-of-entry by decompressing it. */ 3055 switch (zip->entry->compression) { 3056#ifdef HAVE_ZLIB_H 3057 case 8: /* Deflate compression. */ 3058 while (!zip->end_of_entry) { 3059 int64_t offset = 0; 3060 const void *buff = NULL; 3061 size_t size = 0; 3062 int r; 3063 r = zip_read_data_deflate(a, &buff, &size, &offset); 3064 if (r != ARCHIVE_OK) 3065 return (r); 3066 } 3067 return ARCHIVE_OK; 3068#endif 3069 default: /* Uncompressed or unknown. */ 3070 /* Scan for a PK\007\010 signature. */ 3071 for (;;) { 3072 const char *p, *buff; 3073 ssize_t bytes_avail; 3074 buff = __archive_read_ahead(a, 16, &bytes_avail); 3075 if (bytes_avail < 16) { 3076 archive_set_error(&a->archive, 3077 ARCHIVE_ERRNO_FILE_FORMAT, 3078 "Truncated ZIP file data"); 3079 return (ARCHIVE_FATAL); 3080 } 3081 p = buff; 3082 while (p <= buff + bytes_avail - 16) { 3083 if (p[3] == 'P') { p += 3; } 3084 else if (p[3] == 'K') { p += 2; } 3085 else if (p[3] == '\007') { p += 1; } 3086 else if (p[3] == '\010' && p[2] == '\007' 3087 && p[1] == 'K' && p[0] == 'P') { 3088 if (zip->entry->flags & LA_USED_ZIP64) 3089 __archive_read_consume(a, 3090 p - buff + 24); 3091 else 3092 __archive_read_consume(a, 3093 p - buff + 16); 3094 return ARCHIVE_OK; 3095 } else { p += 4; } 3096 } 3097 __archive_read_consume(a, p - buff); 3098 } 3099 } 3100} 3101 3102int 3103archive_read_support_format_zip_streamable(struct archive *_a) 3104{ 3105 struct archive_read *a = (struct archive_read *)_a; 3106 struct zip *zip; 3107 int r; 3108 3109 archive_check_magic(_a, ARCHIVE_READ_MAGIC, 3110 ARCHIVE_STATE_NEW, "archive_read_support_format_zip"); 3111 3112 zip = (struct zip *)calloc(1, sizeof(*zip)); 3113 if (zip == NULL) { 3114 archive_set_error(&a->archive, ENOMEM, 3115 "Can't allocate zip data"); 3116 return (ARCHIVE_FATAL); 3117 } 3118 3119 /* Streamable reader doesn't support mac extensions. */ 3120 zip->process_mac_extensions = 0; 3121 3122 /* 3123 * Until enough data has been read, we cannot tell about 3124 * any encrypted entries yet. 3125 */ 3126 zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW; 3127 zip->crc32func = real_crc32; 3128 3129 r = __archive_read_register_format(a, 3130 zip, 3131 "zip", 3132 archive_read_format_zip_streamable_bid, 3133 archive_read_format_zip_options, 3134 archive_read_format_zip_streamable_read_header, 3135 archive_read_format_zip_read_data, 3136 archive_read_format_zip_read_data_skip_streamable, 3137 NULL, 3138 archive_read_format_zip_cleanup, 3139 archive_read_support_format_zip_capabilities_streamable, 3140 archive_read_format_zip_has_encrypted_entries); 3141 3142 if (r != ARCHIVE_OK) 3143 free(zip); 3144 return (ARCHIVE_OK); 3145} 3146 3147/* ------------------------------------------------------------------------ */ 3148 3149/* 3150 * Seeking-mode support 3151 */ 3152 3153static int 3154archive_read_support_format_zip_capabilities_seekable(struct archive_read * a) 3155{ 3156 (void)a; /* UNUSED */ 3157 return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA | 3158 ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA); 3159} 3160 3161/* 3162 * TODO: This is a performance sink because it forces the read core to 3163 * drop buffered data from the start of file, which will then have to 3164 * be re-read again if this bidder loses. 3165 * 3166 * We workaround this a little by passing in the best bid so far so 3167 * that later bidders can do nothing if they know they'll never 3168 * outbid. But we can certainly do better... 3169 */ 3170static int 3171read_eocd(struct zip *zip, const char *p, int64_t current_offset) 3172{ 3173 /* Sanity-check the EOCD we've found. */ 3174 3175 /* This must be the first volume. */ 3176 if (archive_le16dec(p + 4) != 0) 3177 return 0; 3178 /* Central directory must be on this volume. */ 3179 if (archive_le16dec(p + 4) != archive_le16dec(p + 6)) 3180 return 0; 3181 /* All central directory entries must be on this volume. */ 3182 if (archive_le16dec(p + 10) != archive_le16dec(p + 8)) 3183 return 0; 3184 /* Central directory can't extend beyond start of EOCD record. */ 3185 if (archive_le32dec(p + 16) + archive_le32dec(p + 12) 3186 > current_offset) 3187 return 0; 3188 3189 /* Save the central directory location for later use. */ 3190 zip->central_directory_offset = archive_le32dec(p + 16); 3191 3192 /* This is just a tiny bit higher than the maximum 3193 returned by the streaming Zip bidder. This ensures 3194 that the more accurate seeking Zip parser wins 3195 whenever seek is available. */ 3196 return 32; 3197} 3198 3199/* 3200 * Examine Zip64 EOCD locator: If it's valid, store the information 3201 * from it. 3202 */ 3203static int 3204read_zip64_eocd(struct archive_read *a, struct zip *zip, const char *p) 3205{ 3206 int64_t eocd64_offset; 3207 int64_t eocd64_size; 3208 3209 /* Sanity-check the locator record. */ 3210 3211 /* Central dir must be on first volume. */ 3212 if (archive_le32dec(p + 4) != 0) 3213 return 0; 3214 /* Must be only a single volume. */ 3215 if (archive_le32dec(p + 16) != 1) 3216 return 0; 3217 3218 /* Find the Zip64 EOCD record. */ 3219 eocd64_offset = archive_le64dec(p + 8); 3220 if (__archive_read_seek(a, eocd64_offset, SEEK_SET) < 0) 3221 return 0; 3222 if ((p = __archive_read_ahead(a, 56, NULL)) == NULL) 3223 return 0; 3224 /* Make sure we can read all of it. */ 3225 eocd64_size = archive_le64dec(p + 4) + 12; 3226 if (eocd64_size < 56 || eocd64_size > 16384) 3227 return 0; 3228 if ((p = __archive_read_ahead(a, (size_t)eocd64_size, NULL)) == NULL) 3229 return 0; 3230 3231 /* Sanity-check the EOCD64 */ 3232 if (archive_le32dec(p + 16) != 0) /* Must be disk #0 */ 3233 return 0; 3234 if (archive_le32dec(p + 20) != 0) /* CD must be on disk #0 */ 3235 return 0; 3236 /* CD can't be split. */ 3237 if (archive_le64dec(p + 24) != archive_le64dec(p + 32)) 3238 return 0; 3239 3240 /* Save the central directory offset for later use. */ 3241 zip->central_directory_offset = archive_le64dec(p + 48); 3242 3243 return 32; 3244} 3245 3246static int 3247archive_read_format_zip_seekable_bid(struct archive_read *a, int best_bid) 3248{ 3249 struct zip *zip = (struct zip *)a->format->data; 3250 int64_t file_size, current_offset; 3251 const char *p; 3252 int i, tail; 3253 3254 /* If someone has already bid more than 32, then avoid 3255 trashing the look-ahead buffers with a seek. */ 3256 if (best_bid > 32) 3257 return (-1); 3258 3259 file_size = __archive_read_seek(a, 0, SEEK_END); 3260 if (file_size <= 0) 3261 return 0; 3262 3263 /* Search last 16k of file for end-of-central-directory 3264 * record (which starts with PK\005\006) */ 3265 tail = (int)zipmin(1024 * 16, file_size); 3266 current_offset = __archive_read_seek(a, -tail, SEEK_END); 3267 if (current_offset < 0) 3268 return 0; 3269 if ((p = __archive_read_ahead(a, (size_t)tail, NULL)) == NULL) 3270 return 0; 3271 /* Boyer-Moore search backwards from the end, since we want 3272 * to match the last EOCD in the file (there can be more than 3273 * one if there is an uncompressed Zip archive as a member 3274 * within this Zip archive). */ 3275 for (i = tail - 22; i > 0;) { 3276 switch (p[i]) { 3277 case 'P': 3278 if (memcmp(p + i, "PK\005\006", 4) == 0) { 3279 int ret = read_eocd(zip, p + i, 3280 current_offset + i); 3281 /* Zip64 EOCD locator precedes 3282 * regular EOCD if present. */ 3283 if (i >= 20 && memcmp(p + i - 20, "PK\006\007", 4) == 0) { 3284 int ret_zip64 = read_zip64_eocd(a, zip, p + i - 20); 3285 if (ret_zip64 > ret) 3286 ret = ret_zip64; 3287 } 3288 return (ret); 3289 } 3290 i -= 4; 3291 break; 3292 case 'K': i -= 1; break; 3293 case 005: i -= 2; break; 3294 case 006: i -= 3; break; 3295 default: i -= 4; break; 3296 } 3297 } 3298 return 0; 3299} 3300 3301/* The red-black trees are only used in seeking mode to manage 3302 * the in-memory copy of the central directory. */ 3303 3304static int 3305cmp_node(const struct archive_rb_node *n1, const struct archive_rb_node *n2) 3306{ 3307 const struct zip_entry *e1 = (const struct zip_entry *)n1; 3308 const struct zip_entry *e2 = (const struct zip_entry *)n2; 3309 3310 if (e1->local_header_offset > e2->local_header_offset) 3311 return -1; 3312 if (e1->local_header_offset < e2->local_header_offset) 3313 return 1; 3314 return 0; 3315} 3316 3317static int 3318cmp_key(const struct archive_rb_node *n, const void *key) 3319{ 3320 /* This function won't be called */ 3321 (void)n; /* UNUSED */ 3322 (void)key; /* UNUSED */ 3323 return 1; 3324} 3325 3326static const struct archive_rb_tree_ops rb_ops = { 3327 &cmp_node, &cmp_key 3328}; 3329 3330static int 3331rsrc_cmp_node(const struct archive_rb_node *n1, 3332 const struct archive_rb_node *n2) 3333{ 3334 const struct zip_entry *e1 = (const struct zip_entry *)n1; 3335 const struct zip_entry *e2 = (const struct zip_entry *)n2; 3336 3337 return (strcmp(e2->rsrcname.s, e1->rsrcname.s)); 3338} 3339 3340static int 3341rsrc_cmp_key(const struct archive_rb_node *n, const void *key) 3342{ 3343 const struct zip_entry *e = (const struct zip_entry *)n; 3344 return (strcmp((const char *)key, e->rsrcname.s)); 3345} 3346 3347static const struct archive_rb_tree_ops rb_rsrc_ops = { 3348 &rsrc_cmp_node, &rsrc_cmp_key 3349}; 3350 3351static const char * 3352rsrc_basename(const char *name, size_t name_length) 3353{ 3354 const char *s, *r; 3355 3356 r = s = name; 3357 for (;;) { 3358 s = memchr(s, '/', name_length - (s - name)); 3359 if (s == NULL) 3360 break; 3361 r = ++s; 3362 } 3363 return (r); 3364} 3365 3366static void 3367expose_parent_dirs(struct zip *zip, const char *name, size_t name_length) 3368{ 3369 struct archive_string str; 3370 struct zip_entry *dir; 3371 char *s; 3372 3373 archive_string_init(&str); 3374 archive_strncpy(&str, name, name_length); 3375 for (;;) { 3376 s = strrchr(str.s, '/'); 3377 if (s == NULL) 3378 break; 3379 *s = '\0'; 3380 /* Transfer the parent directory from zip->tree_rsrc RB 3381 * tree to zip->tree RB tree to expose. */ 3382 dir = (struct zip_entry *) 3383 __archive_rb_tree_find_node(&zip->tree_rsrc, str.s); 3384 if (dir == NULL) 3385 break; 3386 __archive_rb_tree_remove_node(&zip->tree_rsrc, &dir->node); 3387 archive_string_free(&dir->rsrcname); 3388 __archive_rb_tree_insert_node(&zip->tree, &dir->node); 3389 } 3390 archive_string_free(&str); 3391} 3392 3393static int 3394slurp_central_directory(struct archive_read *a, struct zip *zip) 3395{ 3396 ssize_t i; 3397 unsigned found; 3398 int64_t correction; 3399 ssize_t bytes_avail; 3400 const char *p; 3401 3402 /* 3403 * Find the start of the central directory. The end-of-CD 3404 * record has our starting point, but there are lots of 3405 * Zip archives which have had other data prepended to the 3406 * file, which makes the recorded offsets all too small. 3407 * So we search forward from the specified offset until we 3408 * find the real start of the central directory. Then we 3409 * know the correction we need to apply to account for leading 3410 * padding. 3411 */ 3412 if (__archive_read_seek(a, zip->central_directory_offset, SEEK_SET) < 0) 3413 return ARCHIVE_FATAL; 3414 3415 found = 0; 3416 while (!found) { 3417 if ((p = __archive_read_ahead(a, 20, &bytes_avail)) == NULL) 3418 return ARCHIVE_FATAL; 3419 for (found = 0, i = 0; !found && i < bytes_avail - 4;) { 3420 switch (p[i + 3]) { 3421 case 'P': i += 3; break; 3422 case 'K': i += 2; break; 3423 case 001: i += 1; break; 3424 case 002: 3425 if (memcmp(p + i, "PK\001\002", 4) == 0) { 3426 p += i; 3427 found = 1; 3428 } else 3429 i += 4; 3430 break; 3431 case 005: i += 1; break; 3432 case 006: 3433 if (memcmp(p + i, "PK\005\006", 4) == 0) { 3434 p += i; 3435 found = 1; 3436 } else if (memcmp(p + i, "PK\006\006", 4) == 0) { 3437 p += i; 3438 found = 1; 3439 } else 3440 i += 1; 3441 break; 3442 default: i += 4; break; 3443 } 3444 } 3445 __archive_read_consume(a, i); 3446 } 3447 correction = archive_filter_bytes(&a->archive, 0) 3448 - zip->central_directory_offset; 3449 3450 __archive_rb_tree_init(&zip->tree, &rb_ops); 3451 __archive_rb_tree_init(&zip->tree_rsrc, &rb_rsrc_ops); 3452 3453 zip->central_directory_entries_total = 0; 3454 while (1) { 3455 struct zip_entry *zip_entry; 3456 size_t filename_length, extra_length, comment_length; 3457 uint32_t external_attributes; 3458 const char *name, *r; 3459 3460 if ((p = __archive_read_ahead(a, 4, NULL)) == NULL) 3461 return ARCHIVE_FATAL; 3462 if (memcmp(p, "PK\006\006", 4) == 0 3463 || memcmp(p, "PK\005\006", 4) == 0) { 3464 break; 3465 } else if (memcmp(p, "PK\001\002", 4) != 0) { 3466 archive_set_error(&a->archive, 3467 -1, "Invalid central directory signature"); 3468 return ARCHIVE_FATAL; 3469 } 3470 if ((p = __archive_read_ahead(a, 46, NULL)) == NULL) 3471 return ARCHIVE_FATAL; 3472 3473 zip_entry = calloc(1, sizeof(struct zip_entry)); 3474 if (zip_entry == NULL) { 3475 archive_set_error(&a->archive, ENOMEM, 3476 "Can't allocate zip entry"); 3477 return ARCHIVE_FATAL; 3478 } 3479 zip_entry->next = zip->zip_entries; 3480 zip_entry->flags |= LA_FROM_CENTRAL_DIRECTORY; 3481 zip->zip_entries = zip_entry; 3482 zip->central_directory_entries_total++; 3483 3484 /* version = p[4]; */ 3485 zip_entry->system = p[5]; 3486 /* version_required = archive_le16dec(p + 6); */ 3487 zip_entry->zip_flags = archive_le16dec(p + 8); 3488 if (zip_entry->zip_flags 3489 & (ZIP_ENCRYPTED | ZIP_STRONG_ENCRYPTED)){ 3490 zip->has_encrypted_entries = 1; 3491 } 3492 zip_entry->compression = (char)archive_le16dec(p + 10); 3493 zip_entry->mtime = zip_time(p + 12); 3494 zip_entry->crc32 = archive_le32dec(p + 16); 3495 if (zip_entry->zip_flags & ZIP_LENGTH_AT_END) 3496 zip_entry->decdat = p[13]; 3497 else 3498 zip_entry->decdat = p[19]; 3499 zip_entry->compressed_size = archive_le32dec(p + 20); 3500 zip_entry->uncompressed_size = archive_le32dec(p + 24); 3501 filename_length = archive_le16dec(p + 28); 3502 extra_length = archive_le16dec(p + 30); 3503 comment_length = archive_le16dec(p + 32); 3504 /* disk_start = archive_le16dec(p + 34); */ /* Better be zero. */ 3505 /* internal_attributes = archive_le16dec(p + 36); */ /* text bit */ 3506 external_attributes = archive_le32dec(p + 38); 3507 zip_entry->local_header_offset = 3508 archive_le32dec(p + 42) + correction; 3509 3510 /* If we can't guess the mode, leave it zero here; 3511 when we read the local file header we might get 3512 more information. */ 3513 if (zip_entry->system == 3) { 3514 zip_entry->mode = external_attributes >> 16; 3515 } else if (zip_entry->system == 0) { 3516 // Interpret MSDOS directory bit 3517 if (0x10 == (external_attributes & 0x10)) { 3518 zip_entry->mode = AE_IFDIR | 0775; 3519 } else { 3520 zip_entry->mode = AE_IFREG | 0664; 3521 } 3522 if (0x01 == (external_attributes & 0x01)) { 3523 // Read-only bit; strip write permissions 3524 zip_entry->mode &= 0555; 3525 } 3526 } else { 3527 zip_entry->mode = 0; 3528 } 3529 3530 /* We're done with the regular data; get the filename and 3531 * extra data. */ 3532 __archive_read_consume(a, 46); 3533 p = __archive_read_ahead(a, filename_length + extra_length, 3534 NULL); 3535 if (p == NULL) { 3536 archive_set_error(&a->archive, 3537 ARCHIVE_ERRNO_FILE_FORMAT, 3538 "Truncated ZIP file header"); 3539 return ARCHIVE_FATAL; 3540 } 3541 if (ARCHIVE_OK != process_extra(a, p + filename_length, extra_length, zip_entry)) { 3542 return ARCHIVE_FATAL; 3543 } 3544 3545 /* 3546 * Mac resource fork files are stored under the 3547 * "__MACOSX/" directory, so we should check if 3548 * it is. 3549 */ 3550 if (!zip->process_mac_extensions) { 3551 /* Treat every entry as a regular entry. */ 3552 __archive_rb_tree_insert_node(&zip->tree, 3553 &zip_entry->node); 3554 } else { 3555 name = p; 3556 r = rsrc_basename(name, filename_length); 3557 if (filename_length >= 9 && 3558 strncmp("__MACOSX/", name, 9) == 0) { 3559 /* If this file is not a resource fork nor 3560 * a directory. We should treat it as a non 3561 * resource fork file to expose it. */ 3562 if (name[filename_length-1] != '/' && 3563 (r - name < 3 || r[0] != '.' || r[1] != '_')) { 3564 __archive_rb_tree_insert_node( 3565 &zip->tree, &zip_entry->node); 3566 /* Expose its parent directories. */ 3567 expose_parent_dirs(zip, name, 3568 filename_length); 3569 } else { 3570 /* This file is a resource fork file or 3571 * a directory. */ 3572 archive_strncpy(&(zip_entry->rsrcname), 3573 name, filename_length); 3574 __archive_rb_tree_insert_node( 3575 &zip->tree_rsrc, &zip_entry->node); 3576 } 3577 } else { 3578 /* Generate resource fork name to find its 3579 * resource file at zip->tree_rsrc. */ 3580 archive_strcpy(&(zip_entry->rsrcname), 3581 "__MACOSX/"); 3582 archive_strncat(&(zip_entry->rsrcname), 3583 name, r - name); 3584 archive_strcat(&(zip_entry->rsrcname), "._"); 3585 archive_strncat(&(zip_entry->rsrcname), 3586 name + (r - name), 3587 filename_length - (r - name)); 3588 /* Register an entry to RB tree to sort it by 3589 * file offset. */ 3590 __archive_rb_tree_insert_node(&zip->tree, 3591 &zip_entry->node); 3592 } 3593 } 3594 3595 /* Skip the comment too ... */ 3596 __archive_read_consume(a, 3597 filename_length + extra_length + comment_length); 3598 } 3599 3600 return ARCHIVE_OK; 3601} 3602 3603static ssize_t 3604zip_get_local_file_header_size(struct archive_read *a, size_t extra) 3605{ 3606 const char *p; 3607 ssize_t filename_length, extra_length; 3608 3609 if ((p = __archive_read_ahead(a, extra + 30, NULL)) == NULL) { 3610 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 3611 "Truncated ZIP file header"); 3612 return (ARCHIVE_WARN); 3613 } 3614 p += extra; 3615 3616 if (memcmp(p, "PK\003\004", 4) != 0) { 3617 archive_set_error(&a->archive, -1, "Damaged Zip archive"); 3618 return ARCHIVE_WARN; 3619 } 3620 filename_length = archive_le16dec(p + 26); 3621 extra_length = archive_le16dec(p + 28); 3622 3623 return (30 + filename_length + extra_length); 3624} 3625 3626static int 3627zip_read_mac_metadata(struct archive_read *a, struct archive_entry *entry, 3628 struct zip_entry *rsrc) 3629{ 3630 struct zip *zip = (struct zip *)a->format->data; 3631 unsigned char *metadata, *mp; 3632 int64_t offset = archive_filter_bytes(&a->archive, 0); 3633 size_t remaining_bytes, metadata_bytes; 3634 ssize_t hsize; 3635 int ret = ARCHIVE_OK, eof; 3636 3637 switch(rsrc->compression) { 3638 case 0: /* No compression. */ 3639 if (rsrc->uncompressed_size != rsrc->compressed_size) { 3640 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 3641 "Malformed OS X metadata entry: inconsistent size"); 3642 return (ARCHIVE_FATAL); 3643 } 3644#ifdef HAVE_ZLIB_H 3645 case 8: /* Deflate compression. */ 3646#endif 3647 break; 3648 default: /* Unsupported compression. */ 3649 /* Return a warning. */ 3650 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 3651 "Unsupported ZIP compression method (%s)", 3652 compression_name(rsrc->compression)); 3653 /* We can't decompress this entry, but we will 3654 * be able to skip() it and try the next entry. */ 3655 return (ARCHIVE_WARN); 3656 } 3657 3658 if (rsrc->uncompressed_size > (4 * 1024 * 1024)) { 3659 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 3660 "Mac metadata is too large: %jd > 4M bytes", 3661 (intmax_t)rsrc->uncompressed_size); 3662 return (ARCHIVE_WARN); 3663 } 3664 if (rsrc->compressed_size > (4 * 1024 * 1024)) { 3665 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 3666 "Mac metadata is too large: %jd > 4M bytes", 3667 (intmax_t)rsrc->compressed_size); 3668 return (ARCHIVE_WARN); 3669 } 3670 3671 metadata = malloc((size_t)rsrc->uncompressed_size); 3672 if (metadata == NULL) { 3673 archive_set_error(&a->archive, ENOMEM, 3674 "Can't allocate memory for Mac metadata"); 3675 return (ARCHIVE_FATAL); 3676 } 3677 3678 if (offset < rsrc->local_header_offset) 3679 __archive_read_consume(a, rsrc->local_header_offset - offset); 3680 else if (offset != rsrc->local_header_offset) { 3681 __archive_read_seek(a, rsrc->local_header_offset, SEEK_SET); 3682 } 3683 3684 hsize = zip_get_local_file_header_size(a, 0); 3685 __archive_read_consume(a, hsize); 3686 3687 remaining_bytes = (size_t)rsrc->compressed_size; 3688 metadata_bytes = (size_t)rsrc->uncompressed_size; 3689 mp = metadata; 3690 eof = 0; 3691 while (!eof && remaining_bytes) { 3692 const unsigned char *p; 3693 ssize_t bytes_avail; 3694 size_t bytes_used; 3695 3696 p = __archive_read_ahead(a, 1, &bytes_avail); 3697 if (p == NULL) { 3698 archive_set_error(&a->archive, 3699 ARCHIVE_ERRNO_FILE_FORMAT, 3700 "Truncated ZIP file header"); 3701 ret = ARCHIVE_WARN; 3702 goto exit_mac_metadata; 3703 } 3704 if ((size_t)bytes_avail > remaining_bytes) 3705 bytes_avail = remaining_bytes; 3706 switch(rsrc->compression) { 3707 case 0: /* No compression. */ 3708 if ((size_t)bytes_avail > metadata_bytes) 3709 bytes_avail = metadata_bytes; 3710 memcpy(mp, p, bytes_avail); 3711 bytes_used = (size_t)bytes_avail; 3712 metadata_bytes -= bytes_used; 3713 mp += bytes_used; 3714 if (metadata_bytes == 0) 3715 eof = 1; 3716 break; 3717#ifdef HAVE_ZLIB_H 3718 case 8: /* Deflate compression. */ 3719 { 3720 int r; 3721 3722 ret = zip_deflate_init(a, zip); 3723 if (ret != ARCHIVE_OK) 3724 goto exit_mac_metadata; 3725 zip->stream.next_in = 3726 (Bytef *)(uintptr_t)(const void *)p; 3727 zip->stream.avail_in = (uInt)bytes_avail; 3728 zip->stream.total_in = 0; 3729 zip->stream.next_out = mp; 3730 zip->stream.avail_out = (uInt)metadata_bytes; 3731 zip->stream.total_out = 0; 3732 3733 r = inflate(&zip->stream, 0); 3734 switch (r) { 3735 case Z_OK: 3736 break; 3737 case Z_STREAM_END: 3738 eof = 1; 3739 break; 3740 case Z_MEM_ERROR: 3741 archive_set_error(&a->archive, ENOMEM, 3742 "Out of memory for ZIP decompression"); 3743 ret = ARCHIVE_FATAL; 3744 goto exit_mac_metadata; 3745 default: 3746 archive_set_error(&a->archive, 3747 ARCHIVE_ERRNO_MISC, 3748 "ZIP decompression failed (%d)", r); 3749 ret = ARCHIVE_FATAL; 3750 goto exit_mac_metadata; 3751 } 3752 bytes_used = zip->stream.total_in; 3753 metadata_bytes -= zip->stream.total_out; 3754 mp += zip->stream.total_out; 3755 break; 3756 } 3757#endif 3758 default: 3759 bytes_used = 0; 3760 break; 3761 } 3762 __archive_read_consume(a, bytes_used); 3763 remaining_bytes -= bytes_used; 3764 } 3765 archive_entry_copy_mac_metadata(entry, metadata, 3766 (size_t)rsrc->uncompressed_size - metadata_bytes); 3767 3768exit_mac_metadata: 3769 __archive_read_seek(a, offset, SEEK_SET); 3770 zip->decompress_init = 0; 3771 free(metadata); 3772 return (ret); 3773} 3774 3775static int 3776archive_read_format_zip_seekable_read_header(struct archive_read *a, 3777 struct archive_entry *entry) 3778{ 3779 struct zip *zip = (struct zip *)a->format->data; 3780 struct zip_entry *rsrc; 3781 int64_t offset; 3782 int r, ret = ARCHIVE_OK; 3783 3784 /* 3785 * It should be sufficient to call archive_read_next_header() for 3786 * a reader to determine if an entry is encrypted or not. If the 3787 * encryption of an entry is only detectable when calling 3788 * archive_read_data(), so be it. We'll do the same check there 3789 * as well. 3790 */ 3791 if (zip->has_encrypted_entries == 3792 ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) 3793 zip->has_encrypted_entries = 0; 3794 3795 a->archive.archive_format = ARCHIVE_FORMAT_ZIP; 3796 if (a->archive.archive_format_name == NULL) 3797 a->archive.archive_format_name = "ZIP"; 3798 3799 if (zip->zip_entries == NULL) { 3800 r = slurp_central_directory(a, zip); 3801 if (r != ARCHIVE_OK) 3802 return r; 3803 /* Get first entry whose local header offset is lower than 3804 * other entries in the archive file. */ 3805 zip->entry = 3806 (struct zip_entry *)ARCHIVE_RB_TREE_MIN(&zip->tree); 3807 } else if (zip->entry != NULL) { 3808 /* Get next entry in local header offset order. */ 3809 zip->entry = (struct zip_entry *)__archive_rb_tree_iterate( 3810 &zip->tree, &zip->entry->node, ARCHIVE_RB_DIR_RIGHT); 3811 } 3812 3813 if (zip->entry == NULL) 3814 return ARCHIVE_EOF; 3815 3816 if (zip->entry->rsrcname.s) 3817 rsrc = (struct zip_entry *)__archive_rb_tree_find_node( 3818 &zip->tree_rsrc, zip->entry->rsrcname.s); 3819 else 3820 rsrc = NULL; 3821 3822 if (zip->cctx_valid) 3823 archive_decrypto_aes_ctr_release(&zip->cctx); 3824 if (zip->hctx_valid) 3825 archive_hmac_sha1_cleanup(&zip->hctx); 3826 zip->tctx_valid = zip->cctx_valid = zip->hctx_valid = 0; 3827 __archive_read_reset_passphrase(a); 3828 3829 /* File entries are sorted by the header offset, we should mostly 3830 * use __archive_read_consume to advance a read point to avoid redundant 3831 * data reading. */ 3832 offset = archive_filter_bytes(&a->archive, 0); 3833 if (offset < zip->entry->local_header_offset) 3834 __archive_read_consume(a, 3835 zip->entry->local_header_offset - offset); 3836 else if (offset != zip->entry->local_header_offset) { 3837 __archive_read_seek(a, zip->entry->local_header_offset, 3838 SEEK_SET); 3839 } 3840 zip->unconsumed = 0; 3841 r = zip_read_local_file_header(a, entry, zip); 3842 if (r != ARCHIVE_OK) 3843 return r; 3844 if (rsrc) { 3845 int ret2 = zip_read_mac_metadata(a, entry, rsrc); 3846 if (ret2 < ret) 3847 ret = ret2; 3848 } 3849 return (ret); 3850} 3851 3852/* 3853 * We're going to seek for the next header anyway, so we don't 3854 * need to bother doing anything here. 3855 */ 3856static int 3857archive_read_format_zip_read_data_skip_seekable(struct archive_read *a) 3858{ 3859 struct zip *zip; 3860 zip = (struct zip *)(a->format->data); 3861 3862 zip->unconsumed = 0; 3863 return (ARCHIVE_OK); 3864} 3865 3866int 3867archive_read_support_format_zip_seekable(struct archive *_a) 3868{ 3869 struct archive_read *a = (struct archive_read *)_a; 3870 struct zip *zip; 3871 int r; 3872 3873 archive_check_magic(_a, ARCHIVE_READ_MAGIC, 3874 ARCHIVE_STATE_NEW, "archive_read_support_format_zip_seekable"); 3875 3876 zip = (struct zip *)calloc(1, sizeof(*zip)); 3877 if (zip == NULL) { 3878 archive_set_error(&a->archive, ENOMEM, 3879 "Can't allocate zip data"); 3880 return (ARCHIVE_FATAL); 3881 } 3882 3883#ifdef HAVE_COPYFILE_H 3884 /* Set this by default on Mac OS. */ 3885 zip->process_mac_extensions = 1; 3886#endif 3887 3888 /* 3889 * Until enough data has been read, we cannot tell about 3890 * any encrypted entries yet. 3891 */ 3892 zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW; 3893 zip->crc32func = real_crc32; 3894 3895 r = __archive_read_register_format(a, 3896 zip, 3897 "zip", 3898 archive_read_format_zip_seekable_bid, 3899 archive_read_format_zip_options, 3900 archive_read_format_zip_seekable_read_header, 3901 archive_read_format_zip_read_data, 3902 archive_read_format_zip_read_data_skip_seekable, 3903 NULL, 3904 archive_read_format_zip_cleanup, 3905 archive_read_support_format_zip_capabilities_seekable, 3906 archive_read_format_zip_has_encrypted_entries); 3907 3908 if (r != ARCHIVE_OK) 3909 free(zip); 3910 return (ARCHIVE_OK); 3911} 3912 3913/*# vim:set noet:*/ 3914