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